{ "spore": "profile", "id": "krytox-gpl-205", "spore_version": "0.2", "family": "perfluoropolyether-greases", "name": "Krytox GPL 205 PTFE-thickened PFPE grease", "abbreviation": "GPL 205", "role": "general-purpose grease for bearings, valves and seals", "category": "tribology", "type": "greases", "summary": "Krytox GPL 205 is a PTFE-thickened perfluoropolyether (PFPE) grease made by Chemours, with NLGI grade 2 consistency and a base oil viscosity of 160 cSt at 40 °C. Chemours gives an estimated useful range of -36 °C to 204 °C for it, and a maximum oil volatility of 7 % in 22 hours at 204 °C under ASTM D2595. Chemours describes the grease as nonflammable and rates it H-1 for incidental food contact. No flight, outgassing or vacuum test value for this grade was found in the sources read.\n", "best_for": "Bearings, valves and seals from -36 °C to 204 °C where a non-reactive grease with H-1 incidental food-contact approval is needed (Chemours typical properties)", "weakest_at": "Oil loss at high temperature: 7 % oil volatility in 22 hours at 204 °C (ASTM D2595, Chemours typical value). No vacuum outgassing value for this grade was found", "identity": { "formula": "F-[CF(CF3)-CF2-O]n-CF2CF3, n = 10 to 60 (PFPE base oil), thickened with PTFE (CF2-CF2)n", "cas": "60164-51-4", "designations": [ { "system": "Trade name", "code": "Krytox GPL 205", "source": "miller-gpl205", "where": "Product page title and product details" } ], "source": "krytox-wikipedia", "where": "Lead section: structure, degree of polymerisation and CAS number of the Krytox PFPE family. The CAS number is the family number; a CAS number for GPL 205 itself was not found" }, "tags": { "environments": [], "stresses": [], "applications": [ "mechanisms", "propulsion-and-tanks" ] }, "properties": [ { "benchmark": "min_service_temp", "label": "Estimated useful range, lower limit, Krytox GPL 205", "value": -36, "bound": "exact", "unit": "°C", "scope": "material", "conditions": { "grade": "Krytox GPL 205 (H-1) grease", "basis": "Chemours footnote 3: based on pour point and where evaporation is approximately 10 %" }, "method": "Typical value printed on the Miller-Stephenson product page, not a specification limit. The Chemours table (footnote 1) prints the same lower limit with an en-dash minus sign", "status": "ground", "source": "miller-gpl205", "where": "Summary section, sentence giving the estimated useful temperature range (-36°C to 204°C)", "source_detail": { "title": "Krytox GPL 205 grease, Miller-Stephenson product page", "id": "Product details, applications, specifications met (ASTM D2595, ASTM D6184, NSF H-1)", "url": "https://miller-stephenson.com/?p=789", "kind": "web", "license": "distributor web page, linked not reproduced" } }, { "benchmark": "max_service_temp", "label": "Estimated useful range, upper limit, Krytox GPL 205", "value": 204, "bound": "exact", "unit": "°C", "scope": "material", "conditions": { "grade": "Krytox GPL 205 (H-1) grease", "basis": "Chemours footnote 3: based on pour point and where evaporation is approximately 10 %" }, "method": "Typical value printed by the manufacturer, not a specification limit (Chemours footnote 1). The Chempoint GPL performance article prints the same range", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Estimated Useful Range row, °C, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "iso_viscosity_grade", "label": "ISO viscosity grade of the base oil", "value": 150, "bound": "exact", "unit": "-", "scope": "material", "conditions": { "basis": "Base oil column 105 (H-1), from which the GPL 205 grease is made (Miller-Stephenson product page)" }, "method": "Typical value printed by the manufacturer; the table prints one value per column for the oil and the grease of the same number", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, ISO Grade of Oil row, column 105 (H-1) and 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "nlgi_grade", "label": "NLGI consistency grade, standard grade", "value": 2, "bound": "exact", "unit": "-", "scope": "material", "conditions": { "penetration_as_printed": "265–295 (the page prints no unit for penetration)", "basis": "Standard grade; softer or harder grades can be made by special order" }, "method": "Standard consistency stated by the manufacturer; the Chempoint product page prints NLGI Grade 2 for the same grade", "status": "ground", "source": "chemours-typical-props", "where": "Overview text, paragraph beginning The standard grease consistency is NLGI grade 2", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "kinematic_viscosity", "label": "Base oil kinematic viscosity at 40 °C", "value": 160, "bound": "exact", "unit": "cSt", "scope": "material", "conditions": { "temperature": "40 °C", "basis": "Base oil column 105 (H-1), from which the GPL 205 grease is made" }, "method": "Typical value; Chemours states viscosity may vary within ±10 % (footnote 1)", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Oil Viscosity cSt, 40 °C row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "kinematic_viscosity", "label": "Base oil kinematic viscosity at 100 °C", "value": 18, "bound": "exact", "unit": "cSt", "scope": "material", "conditions": { "temperature": "100 °C", "basis": "Base oil column 105 (H-1), from which the GPL 205 grease is made" }, "method": "Typical value; Chemours states viscosity may vary within ±10 % (footnote 1)", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Oil Viscosity cSt, 100 °C row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "kinematic_viscosity", "label": "Base oil kinematic viscosity at 204 °C", "value": 3.1, "bound": "exact", "unit": "cSt", "scope": "material", "conditions": { "temperature": "204 °C", "basis": "Base oil column 105 (H-1), from which the GPL 205 grease is made" }, "method": "Typical value; Chemours states viscosity may vary within ±10 % (footnote 1)", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Oil Viscosity cSt, 204 °C row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "viscosity_index", "label": "Base oil viscosity index", "value": 124, "bound": "exact", "unit": "-", "scope": "material", "conditions": { "basis": "Base oil column 105 (H-1), from which the GPL 205 grease is made" }, "method": "Typical value printed by the manufacturer; no test method printed", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Oil Viscosity Index row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "oil_density", "label": "Base oil density at 0 °C", "value": 1.94, "bound": "exact", "unit": "g/mL", "scope": "material", "conditions": { "temperature": "0 °C", "basis": "Base oil column 105 (H-1); the density of the grease itself is not printed" }, "method": "Typical value printed by the manufacturer", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Oil Density g/mL, 0 °C row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "oil_density", "label": "Base oil density at 100 °C", "value": 1.76, "bound": "exact", "unit": "g/mL", "scope": "material", "conditions": { "temperature": "100 °C", "basis": "Base oil column 105 (H-1); the density of the grease itself is not printed" }, "method": "Typical value printed by the manufacturer", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Oil Density g/mL, 100 °C row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "oil_volatility", "label": "Maximum oil volatility, ASTM D2595, at 121 °C", "value": 1, "bound": "exact", "unit": "%", "scope": "material", "conditions": { "temperature": "121 °C", "time": "22 hours", "test": "ASTM D2595", "basis": "Base oil column 105 (H-1), from which the GPL 205 grease is made" }, "method": "Typical value printed by the manufacturer under the stated ASTM test", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Maximum Oil Volatility ASTM D2595, % in 22 hr, 121 °C row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "oil_volatility", "label": "Maximum oil volatility, ASTM D2595, at 204 °C", "value": 7, "bound": "exact", "unit": "%", "scope": "material", "conditions": { "temperature": "204 °C", "time": "22 hours", "test": "ASTM D2595", "basis": "Base oil column 105 (H-1), from which the GPL 205 grease is made" }, "method": "Typical value printed by the manufacturer under the stated ASTM test", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Maximum Oil Volatility ASTM D2595, % in 22 hr, 204 °C row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "oil_separation", "label": "Oil separation from grease, ASTM D6184, at 99 °C", "value": 5, "bound": "exact", "unit": "% (wt loss)", "scope": "material", "conditions": { "temperature": "99 °C", "time": "30 hours", "test": "ASTM D6184", "basis": "Base oil column 105 (H-1), from which the GPL 205 grease is made" }, "method": "Typical value printed by the manufacturer under the stated ASTM test", "status": "ground", "source": "chemours-typical-props", "where": "Typical Properties table, Oil Separation from Grease ASTM D6184, wt loss % in 30 hr, 99 °C row, column 205 (H-1)", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } }, { "benchmark": "melting_point", "label": "Melting point of the PTFE thickener", "value": 325, "bound": "exact", "unit": "°C", "scope": "material", "conditions": { "component": "PTFE thickener, not the grease", "unit_as_printed": "325 °C (617 °F)" }, "method": "Value printed by the manufacturer in the Overview text", "status": "ground", "source": "chemours-typical-props", "where": "Overview text, paragraph on the PTFE thickener, melting point sentence", "source_detail": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" } } ], "corrosion": [ { "environment": "Oxygen at high pressure", "headline": "Chemours says Krytox lubricants resist degradation from oxygen at pressures above 3,000 psi (207 bar).", "effect": "The Chemours article states that Krytox lubricants resist degradation from oxygen at pressures greater than 3,000 psi (207 bar), and it names no grade.", "rating": "unknown", "conditions": { "basis": "General statement for Krytox lubricants, not a GPL 205 test result" }, "source": "chemours-reactive-gas", "where": "Oxygen section" }, { "environment": "Heat, 22 hours at 204 °C (oil evaporation)", "headline": "The base oil of GPL 205 loses 7 % by evaporation in 22 hours at 204 °C under ASTM D2595.", "effect": "At 121 °C the same test gives 1 %, so evaporation rises sharply between the two temperatures. This is the main ageing measure printed for the grade.", "rating": "unknown", "conditions": { "basis": "Typical value for the base oil column 105 (H-1); the grease itself was not tested in the source" }, "source": "chemours-typical-props", "where": "Typical Properties table, Maximum Oil Volatility ASTM D2595 rows, column 205 (H-1)" }, { "environment": "Heat, 30 hours at 99 °C (oil separation)", "headline": "Oil separation from GPL 205 is 5 % weight loss in 30 hours at 99 °C under ASTM D6184.", "effect": "Oil separation from the grease is the loss of base oil from the thickener over time at temperature, and it is printed as a typical value.", "rating": "unknown", "conditions": { "basis": "Typical value for the base oil column 105 (H-1); the source prints no test at higher temperature for this grade" }, "source": "chemours-typical-props", "where": "Typical Properties table, Oil Separation from Grease ASTM D6184 rows, column 205 (H-1)" }, { "environment": "Chemicals and radiation (general Krytox claims)", "headline": "The Krytox PFPE family is described as thermally stable, nonflammable, insoluble in water and most solvents, and radiation resistant, with no numbers given.", "effect": "The Wikipedia article and the Miller-Stephenson sheet state chemical and radiation resistance for the Krytox family. The Miller-Stephenson sheet adds that Krytox is compatible with plastics, elastomers, metals and ceramics.", "rating": "unknown", "conditions": { "basis": "General statements for the Krytox family; no test condition printed" }, "source": "krytox-wikipedia", "where": "Lead section, uses and properties paragraph" } ], "risks": { "hazards": [ { "text": "Chemours calls Krytox nonflammable, and the 2004 DuPont MSDS for Krytox PFPE oils gives a PMCC flash point of Does not ignite for the oils. That MSDS covers the oils, not the GPL 205 grease.", "ghs": [], "source": "dupont-msds-pfpe-oils", "where": "Fire Fighting Measures, Flammable Properties" }, { "text": "Eye contact may cause irritation with discomfort, tearing or blurring of vision; skin contact may cause reddening. The DuPont MSDS says the product was not a skin irritant or sensitizer in a 100-person human patch test.", "ghs": [], "source": "dupont-msds-pfpe-oils", "where": "Hazards Identification, Potential Health Effects" }, { "text": "Overheated or burning product releases fluorine-containing decomposition products that may cause lung irritation and pulmonary edema, which require medical treatment.", "ghs": [], "source": "dupont-msds-pfpe-oils", "where": "Hazards Identification, Potential Health Effects" }, { "text": "The manufacturer warns of mild skin and eye irritation, and says contact with hot surfaces above 260 °C can produce fumes that cause coughing or respiratory irritation.", "ghs": [], "source": "krytox-wikipedia", "where": "Safety section" } ], "failure_risks": [ { "mode": "Overheating above 260 °C", "trigger": "Contact with hot surfaces above 260 °C (500 °F), as the manufacturer warns in the Wikipedia Safety section", "consequence": "Fumes that cause coughing or respiratory irritation; at flame temperatures, toxic fluorine compounds (DuPont MSDS)", "source": "krytox-wikipedia", "where": "Safety section" }, { "mode": "Oil loss by evaporation", "trigger": "Operation at 204 °C for 22 hours (ASTM D2595)", "consequence": "7 % of the base oil evaporates in the test (Chemours typical value for the base oil column 105 (H-1))", "source": "chemours-typical-props", "where": "Typical Properties table, Maximum Oil Volatility ASTM D2595, 204 °C row, column 205 (H-1)" } ], "side_effects": [], "handling": [ { "text": "Use ventilation when the oil is heated above 550 degF, and keep away from heat and flames (DuPont MSDS, Exposure Controls).", "source": "dupont-msds-pfpe-oils" }, { "text": "Keep the container tightly closed, and keep it away from heat and flames to avoid decomposition products (DuPont MSDS, Storage).", "source": "dupont-msds-pfpe-oils" }, { "text": "Avoid contact with eyes and skin and wash thoroughly after handling; the DuPont MSDS treats PFPE oils as inert and of low toxicity (Handling, personnel).", "source": "dupont-msds-pfpe-oils" } ], "mitigations": [] }, "uses": [ { "application": "mechanisms", "device": "Bearings, gears, valves, hinges and seals", "example": "Miller-Stephenson lists bearings, O-rings, valves, hinges, handles, moving parts, seals, connectors, rollers, automotive interiors, fittings and gearboxes among GPL 205 applications.", "source": "miller-gpl205", "where": "Application tab list" }, { "application": "propulsion-and-tanks", "device": "Liquid-oxygen pump bearing housings and valves in oxygen service", "example": "The Miller-Stephenson Krytox sheet lists LOX pump bearing housings and valves and O-rings in oxygen service under Aerospace, for the Krytox GPL grease family. The sheet does not tie these uses to GPL 205 alone.", "source": "miller-tds-krytox", "where": "Applications panel, Aerospace column" } ], "supply": [ { "subject": "Krytox PFPE base oil and grease", "abundance": "Not found in any source held", "producers": [], "critical_lists": [], "substitutes": [ "Named in Wikipedia as another PFPE lubricant line: the Solvay Fomblin range (not compared here)" ], "source": "krytox-wikipedia", "where": "Lead section" }, { "subject": "Manufacturer", "abundance": "Not found in any source held", "producers": [], "critical_lists": [], "substitutes": [], "source": "krytox-wikipedia", "where": "Lead section; the article gives no manufacturing location" } ], "media": [], "documents": [ { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "type": "datasheet", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015 }, { "title": "Miller-Stephenson product page, Krytox GPL 205 grease", "type": "datasheet", "url": "https://miller-stephenson.com/?p=789" }, { "title": "Chempoint product page, Krytox GPL 205 grease (Chemours SKU 0124091)", "type": "datasheet", "url": "https://www.chempoint.com/products/chemours/krytox-greases/krytox-greases-for-general-purpose-applications/krytox-gpl205-grease" }, { "title": "Miller-Stephenson Krytox Tri-Fold, general-purpose oils and greases", "type": "datasheet", "url": "https://www.miller-stephenson.com/wp-content/uploads/2019/10/TDS_Krytox-Tri-Fold.pdf" }, { "title": "DuPont Material Safety Data Sheet, Krytox PFPE Oils, CEC01461, revised 10-Aug-04", "type": "sds", "url": "https://uwaterloo.ca/giga-to-nanoelectronics-centre/sites/default/files/uploads/files/krytoxpfpeoils.pdf", "year": 2004 }, { "title": "NIST Atomic Weights and Isotopic Compositions, carbon", "type": "database", "url": "https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=C&all=all&ascii=html" }, { "title": "NIST Atomic Weights and Isotopic Compositions, fluorine", "type": "database", "url": "https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=F&all=all&ascii=html" }, { "title": "NIST Atomic Weights and Isotopic Compositions, oxygen", "type": "database", "url": "https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=O&all=all&ascii=html" } ], "gaps": [ "Density of the GPL 205 grease itself is not printed; only the base oil density is recorded, as oil_density.", "Flash point and evaporation for the GPL 205 grease were not found. The only flash point read is the 2004 DuPont MSDS for Krytox PFPE oils (Does not ignite, PMCC), which covers the oils, not this grease.", "No oxygen compatibility test result for GPL 205 was read. Chemours names ASTM D2512, ASTM G72, ASTM D2863 and MIL-PRF-27617 for Krytox lubricants but prints no pass or fail or numeric result for GPL 205.", "No vacuum outgassing value (TML, CVCM or similar) for GPL 205 was found in any NASA or ESA source read. The NASA outgassing database was not searched in this run.", "No current Chemours SDS for GPL 205 was read. The Silmid copy needs a sign-in, and the lklab copy is in Korean.", "Supply: no production site, country share, critical-mineral listing or feedstock tonnage for PFPE, hexafluoropropylene oxide or fluorspar was found in a source held.", "Chemical resistance for GPL 205 was not read beyond the manufacturer's general claims (chemically inert and nonreactive; compatible with plastics, elastomers, metals and ceramics).", "Radiation and UV ageing data for GPL 205 were not read. The Wikipedia article and the Miller-Stephenson sheet state radiation resistance without numbers.", "Thickener particle size is printed as 0.2 m in the Chemours PDF, with the micro sign lost in the text, so it is not recorded.", "Property names not in spores/property-canon.yaml, used as short snake_case names: kinematic_viscosity, viscosity_index, iso_viscosity_grade, nlgi_grade, pour_point, oil_density, oil_volatility and oil_separation.", "The CAS number 60164-51-4 is the Krytox PFPE family number given in the Wikipedia lead. A CAS number for GPL 205 itself was not found.", "Penetration (265 to 295) is printed without a unit, so it is recorded in conditions only.", "No space, flight or lunar use data for GPL 205 were found. The aerospace and radiation statements are general claims for the Krytox family.", "No photograph or diagram with a verified licence was read, so media is empty.", "Base oil pour point of -36 °C is printed in the Chemours table with an en-dash minus sign, which the value check cannot match, so it is not recorded as a property." ], "story": { "why": "Krytox GPL 205 is a PTFE-thickened PFPE grease with an estimated useful range of -36 °C to 204 °C, a base oil viscosity of 160 cSt at 40 °C and NLGI grade 2 consistency, all as printed by Chemours. Its PTFE thickener melts at 325 °C. Chemours describes the grease as nonflammable and rates it H-1 for incidental food contact, which is why it is sold for general-purpose use where a non-reactive grease is wanted. No space, vacuum or oxygen test value for this grade was found in the sources read.", "uses": [ { "where": "General industry and maintenance", "line": "Chempoint lists facility infrastructure (compressors) and maintenance of bearings, chains, electric motors and gearboxes as uses of the GPL 205 grease. Chemours says the grease is commonly used to reduce noise, vibration and harshness in automotive parts." }, { "where": "Aerospace and oxygen service (Krytox grease family)", "line": "The Miller-Stephenson sheet lists valves and O-rings in oxygen service and LOX pump bearing housings under aerospace for the Krytox GPL grease family. The sheet does not tie these uses to GPL 205 alone." } ], "can_do": [ { "label": "Run from -36 °C to 204 °C", "line": "The Chemours typical-properties table gives an estimated useful range of -36 °C to 204 °C for GPL 205 (column 205 (H-1)). The Miller-Stephenson product page prints the same range.", "benchmark": "min_service_temp", "scope": "material", "value": "-36 °C to 204 °C estimated useful range" }, { "label": "Hold a standard consistency", "line": "Chemours states that the standard grease consistency is NLGI grade 2, penetration 265–295, with softer or harder grades available by special order.", "benchmark": "nlgi_grade", "scope": "material", "value": "NLGI grade 2 (penetration 265–295)" }, { "label": "Limited oil loss at 121 °C", "line": "The same table gives a maximum oil volatility of 1 % in 22 hours at 121 °C under ASTM D2595, rising to 7 % at 204 °C.", "benchmark": "oil_volatility", "scope": "material", "value": "1 % oil volatility in 22 hours at 121 °C" } ], "compare": "Within the Chemours GPL 200 series, GPL 205 has a heavier base oil than the GPL 200 to 204 grades and a higher upper useful-range limit than those grades (Chemours typical properties; Chempoint GPL performance article). The series values are for Krytox grades only, so the sources cannot rank GPL 205 against non-Krytox greases.", "compare_rows": [ { "label": "Estimated useful range, upper limit", "benchmark": "max_service_temp", "scope": "material" }, { "label": "PTFE thickener melting point", "benchmark": "melting_point", "scope": "material" }, { "label": "Oil volatility at 204 °C", "benchmark": "oil_volatility", "scope": "material" } ], "handling": [ "Use ventilation when the oil is heated above 550 degF (DuPont MSDS).", "Keep containers closed and away from heat and flames to avoid decomposition products.", "Avoid contact with eyes and skin and wash after handling.", "Quote the grade in full (GPL 205, H-1) when specifying, since the H-1 approval applies only to grades with the H-1 mark." ], "good_for": [ "Bearings and valves from -36 °C to 204 °C where a non-reactive grease is needed (Chemours says the Krytox family is chemically inert and nonreactive).", "Food-contact sites: H-1 incidental food contact approval is printed for GPL 205 (Chemours table; Miller-Stephenson page).", "Oxygen service: Chemours and Miller-Stephenson describe the Krytox family as safe for oxygen service, but no GPL 205 test result was read." ], "watch_out": [ "High temperature: 7 % oil volatility in 22 hours at 204 °C (ASTM D2595) means base oil is lost near the top of the range.", "No vacuum outgassing, flight or radiation data for GPL 205 was found, so space use needs a test on the grease itself.", "The 2004 DuPont MSDS covers the PFPE oils, not this grease, and no current Chemours SDS for GPL 205 was read.", "Heating above 260 °C can release fumes (Wikipedia, manufacturer warning)." ], "verdict": "Krytox GPL 205 is a PTFE-thickened PFPE grease with an estimated useful range of -36 °C to 204 °C, NLGI grade 2 consistency and H-1 incidental food-contact approval, as printed by Chemours. Its base oil loses 7 % in 22 hours at 204 °C, and no space, vacuum or oxygen test value for this grade was found in the sources read.", "recipe": { "line": "Krytox GPL 205 is a grease made from a perfluoropolyether (PFPE) base oil, the GPL 105 oil, thickened with polytetrafluoroethylene (PTFE) powder. The PFPE chain is saturated and contains only carbon, oxygen and fluorine, and its repeat unit is CF(CF3)-CF2-O (Chemours Overview; Krytox Wikipedia, lead).", "parts": [ { "name": "Carbon", "symbol": "C", "role": "Three carbons per repeat unit CF(CF3)CF2O: one in the CF backbone site, one in the CF2 site and one in the CF3 side group", "share_note": "Atomic weight [12.0096, 12.0116] (NIST). Chemours prints a typical oil composition by weight in its Overview; it is not recorded here." }, { "name": "Fluorine", "symbol": "F", "role": "Six fluorines per repeat unit: one on the CF site, three on the CF3 group and two on the CF2 site", "share_note": "Atomic weight 18.998 403 162 73(92) (NIST)." }, { "name": "Oxygen", "symbol": "O", "role": "One ether oxygen per repeat unit", "share_note": "Atomic weight [15.999 03, 15.999 77] (NIST)." } ] }, "risk_groups": [ { "title": "For people", "lead": "The DuPont MSDS treats the PFPE oils as inert and of low toxicity, and the hazards in the sources read come from overheating.", "points": [ { "label": "Skin and eyes", "line": "The DuPont MSDS says eye contact may cause irritation and the product was not a skin irritant in a 100-person patch test." }, { "label": "Overheating", "line": "Above 260 °C, fumes that cause coughing or respiratory irritation can form (Wikipedia, manufacturer warning), and flame temperatures release fluorine compounds (DuPont MSDS)." } ], "level": 1, "verdict": "Low hazard in use; overheating is the main hazard" }, { "title": "If it fails", "lead": "The failure route in these sources is oil loss at high temperature, measured as a typical value.", "points": [ { "label": "Oil volatility", "line": "At 204 °C the base oil loses 7 % in 22 hours under ASTM D2595, against 1 % at 121 °C (Chemours typical value)." } ] } ] }, "updated": "2026-11-01", "review": { "status": "draft", "method": "assistant", "checked_values": 14, "unreachable": 2, "caveats": 4, "note": "Values were read by an AI assistant on 2026-11-01 from the pages named in each entry. The Chemours typical-properties table is hosted on a Shopify CDN, not chemours.com, and its values are typical, not specifications. The oil values are for the base oil column 105 (H-1), from which the GPL 205 grease is made; Chemours prints them in the same column as the grease. Unreachable: the Silmid SDS (sign-in required) and the current Chemours SDS (not found in English). The estimated useful range is a Chemours estimate based on pour point and 10 % evaporation." }, "sources": { "chemours-typical-props": { "title": "Typical Properties of Krytox General-Purpose Oils and Greases, Chemours, C-10296 (9/15)", "id": "Chemours table, columns 105 (H-1) and 205 (H-1); replaces H-58510-7", "url": "https://cdn.shopify.com/s/files/1/0519/4733/9937/files/Chemours_Krytox_Typical_Properties_Greases.pdf", "year": 2015, "kind": "datasheet", "license": "manufacturer datasheet, linked not reproduced; hosted on a Shopify CDN, not on chemours.com" }, "miller-gpl205": { "title": "Krytox GPL 205 grease, Miller-Stephenson product page", "id": "Product details, applications, specifications met (ASTM D2595, ASTM D6184, NSF H-1)", "url": "https://miller-stephenson.com/?p=789", "kind": "web", "license": "distributor web page, linked not reproduced" }, "chempoint-gpl205": { "title": "Krytox GPL 205 grease, Chempoint product page (Chemours SKU 0124091)", "id": "Product specifications and application list", "url": "https://www.chempoint.com/products/chemours/krytox-greases/krytox-greases-for-general-purpose-applications/krytox-gpl205-grease", "kind": "web", "license": "distributor web page, linked not reproduced" }, "chemours-gpl-performance": { "title": "Chemours Krytox GPL performance, Chempoint article", "id": "GPL 200 series table, estimated temperature range and oil viscosity", "url": "https://www.chempoint.com/en-ca/insights/chemours-krytox-gpl-performance", "kind": "web", "license": "distributor article, linked not reproduced" }, "chemours-reactive-gas": { "title": "Specifying Grease and Oil for Reactive Gas Environments, Chemours Krytox article (Chempoint)", "id": "Oxygen, chlorine and fluorine service statements", "url": "https://www.chempoint.com/en-ca/insights/chemours-krytox-lubricants-for-reactive-gas-enviro", "kind": "web", "license": "distributor article, linked not reproduced" }, "krytox-wikipedia": { "title": "Krytox, Wikipedia", "id": "Article lead, structure, uses, safety section", "url": "https://en.wikipedia.org/wiki/Krytox", "kind": "web", "license": "CC BY-SA 4.0, linked not reproduced" }, "dupont-msds-pfpe-oils": { "title": "DuPont Material Safety Data Sheet, Krytox PFPE Oils, CEC01461", "id": "Corporate MSDS DU002670, revised 10-Aug-04, printed 13.08.2004", "url": "https://uwaterloo.ca/giga-to-nanoelectronics-centre/sites/default/files/uploads/files/krytoxpfpeoils.pdf", "year": 2004, "kind": "datasheet", "license": "archived supplier SDS, linked not reproduced" }, "miller-tds-krytox": { "title": "Krytox Tri-Fold, Miller-Stephenson general-purpose oils and greases", "id": "Applications panel (Aerospace, Chemical Manufacturing, Vacuum and Optics columns)", "url": "https://www.miller-stephenson.com/wp-content/uploads/2019/10/TDS_Krytox-Tri-Fold.pdf", "kind": "datasheet", "license": "distributor sheet, linked not reproduced" }, "nist-carbon": { "title": "NIST Atomic Weights and Isotopic Compositions, carbon", "id": "Standard atomic weight [12.0096, 12.0116]", "url": "https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=C&all=all&ascii=html", "kind": "database", "license": "US government data" }, "nist-fluorine": { "title": "NIST Atomic Weights and Isotopic Compositions, fluorine", "id": "Atomic weight 18.998 403 162 73(92)", "url": "https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=F&all=all&ascii=html", "kind": "database", "license": "US government data" }, "nist-oxygen": { "title": "NIST Atomic Weights and Isotopic Compositions, oxygen", "id": "Standard atomic weight [15.999 03, 15.999 77]", "url": "https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=O&all=all&ascii=html", "kind": "database", "license": "US government data" } }, "license": "CC-BY-4.0", "url": "https://spacemushroom.com/profiles/krytox-gpl-205/" }