{ "spore": "profile", "id": "pi-kapton-hpp-st", "spore_version": "0.2", "family": "polyimides", "name": "Kapton HPP-ST polyimide film", "abbreviation": "PI (Kapton HPP-ST)", "role": "surface-treated all-polyimide film for flexible circuits, PCB stencils and laminates", "category": "polymers", "type": "polyimides", "summary": "Kapton HPP-ST is a surface-treated all-polyimide film sold by Qnity Electronics, a DuPont spinoff that makes Kapton. For the 100HPP-ST grade (25.4 µm, 1 mil), the manufacturer prints a tensile strength of 231.0 MPa and an elongation at break of 72 % at 23 °C. The 25.4 µm film has a dielectric strength of 303 kV/mm and a dielectric constant of 3.40 at 1 kHz, and the specification caps shrinkage at 0.10 % after 1 hour at 200 °C.", "best_for": "Flexible printed circuit and PCB stencil films where adhesion treatment and a 231.0 MPa tensile strength at 23 °C matter, in the 100HPP-ST grade (25.4 µm)", "weakest_at": "Heat rating under load: the sources give a UL 746B relative thermal index of 240 °C (electrical) and 200 °C (mechanical), which are ratings and not service limits, and no HPP-ST value for in-orbit erosion was read", "identity": { "formula": "C22H10O5N2 repeat unit, poly(4,4'-oxydiphenylene-pyromellitimide), made from pyromellitic dianhydride and 4,4'-oxydianiline; the manufacturer calls HPP-ST an all-polyimide film with the properties of Type HN", "designations": [ { "system": "Trade name", "code": "Kapton® HPP-ST", "source": "qnity-kapton-spec", "where": "Introduction page, heading Kapton® HPP-ST polyimide film" } ], "source": "nasa-tm-2008-215490", "where": "Table of polymer erosion data, row Polyimide (PMDA) PI (Kapton H), formula column C22H10O5N2; Wikipedia Kapton article gives the chemical name for Kapton K and HN" }, "tags": { "environments": [], "stresses": [], "applications": [ "electronics-and-chips", "solar-arrays", "thermal-control" ] }, "properties": [ { "benchmark": "ultimate_tensile_strength", "label": "Tensile strength at 23 °C, Kapton 100HPP-ST", "value": 231, "bound": "exact", "unit": "MPa", "scope": "material", "conditions": { "grade": "Kapton HPP-ST, 100HPP-ST, 25.4 µm (1 mil) film", "temperature": "23 °C" }, "method": "Typical value printed on the manufacturer product page. The summary PDF prints the same 231 MPa for 25 µm HPP-ST by ASTM D-882.", "status": "ground", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST Product Properties table, row Kapton 100HPP-ST, Tensile Strength @23°C (MPa)", "source_detail": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" } }, { "benchmark": "ultimate_tensile_strength", "label": "Tensile strength minimum, 25.4 µm (1.00 mil) film, MD and TD", "value": 165, "bound": "exact", "unit": "MPa", "scope": "material", "conditions": { "grade": "Kapton HN and HPP-ST, 1.00 mil (25.4 µm) film", "temperature": "23 °C", "direction": "MD and TD, minimum" }, "method": "Specification minimum (min.) for 25.4 µm film; the table footnote says it also applies to HPP-ST. ASTM D-882-91 Method A.", "status": "ground", "source": "qnity-kapton-spec", "where": "Table 2, Mechanical Properties of Kapton HN polyimide film, row Tensile Strength psi (MPa) at 23°C min., column 1.00 (25.4)", "source_detail": { "title": "Kapton polyimide film specifications and tolerances, Qnity Electronics (PDF)", "id": "Table 2 (mechanical, HN, footnote applies to HPP-ST), Table 3 (electrical, HN), Table 5 (HPP-ST shrinkage)", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/599767bd7af84d92827184ea3728c2b3?v=5670ee5b", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" } }, { "benchmark": "elongation", "label": "Elongation at break at 23 °C, Kapton 100HPP-ST", "value": 72, "bound": "exact", "unit": "%", "scope": "material", "conditions": { "grade": "Kapton 100HPP-ST, 25.4 µm film", "temperature": "23 °C" }, "method": "Typical value printed on the manufacturer product page. The summary PDF prints 72 % for 25 µm HPP-ST by ASTM D-882.", "status": "ground", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST Product Properties table, row Kapton 100HPP-ST, Elongation % to Break @23°C", "source_detail": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" } }, { "benchmark": "elastic_modulus", "label": "Tensile modulus at 23 °C, Kapton 100HPP-ST", "value": 2.8, "bound": "exact", "unit": "GPa", "scope": "material", "conditions": { "grade": "Kapton 100HPP-ST, 25.4 µm film", "temperature": "23 °C" }, "method": "Typical value printed on the manufacturer product page; no test standard is printed against this column in the text read", "status": "ground", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST Product Properties table, row Kapton 100HPP-ST, Tensile Modulus @23°C (GPa)", "source_detail": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" } }, { "benchmark": "density", "label": "Density, Kapton HPP-ST 25 µm film", "value": 1.42, "bound": "exact", "unit": "g/cc", "scope": "material", "conditions": { "grade": "Kapton HPP-ST, 25 µm (1 mil) film" }, "method": "Typical value by ASTM D-1505, as printed in the summary PDF; the product page prints the same 1.42 g/cc for 100HPP-ST", "status": "ground", "source": "qnity-kapton-summary", "where": "Table 3, Physical and Thermal Properties of Kapton Type HPP-ST Film, row Density g/cc or g/mL, 25 µm column", "source_detail": { "title": "Kapton Summary of Properties, Qnity Electronics (PDF)", "id": "Table 3 (HPP-ST), Table 7 (electrical, HN and HPP-ST), Table 10 (chemical, HN), Safety and Handling", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/810b258c62404e42855984f345fdf8d7?v=a2916962", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" } }, { "benchmark": "dielectric_strength", "label": "Dielectric strength, Kapton 100HPP-ST", "value": 303, "bound": "exact", "unit": "kV/mm", "scope": "material", "conditions": { "grade": "Kapton 100HPP-ST, 25.4 µm film", "test": "60 Hz, 1/4 in electrodes, 500 V/sec rise" }, "method": "Typical value printed on the manufacturer product page. The summary PDF Table 7 prints 303 kV/mm for 25 µm HN and HPP-ST by ASTM D-149.", "status": "ground", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST Product Properties table, row Kapton 100HPP-ST, Dielectric Strength (kV/mm)", "source_detail": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" } }, { "benchmark": "dielectric_strength", "label": "Dielectric strength minimum, 25.4 µm (1.00 mil) film", "value": 236, "bound": "exact", "unit": "kV/mm", "scope": "material", "conditions": { "grade": "Kapton HN and HPP-ST, 1.00 mil (25.4 µm) film", "test": "ASTM D-149-97, AC, flat sheets between 1/4 in brass electrodes" }, "method": "Specification minimum (min.) for 25.4 µm film; the table footnote says it also applies to HPP-ST", "status": "ground", "source": "qnity-kapton-spec", "where": "Table 3, Electrical Properties of Kapton HN polyimide film, row Dielectric Strength AC V/mil (kV/mm) min., column 1.00 (25.4)", "source_detail": { "title": "Kapton polyimide film specifications and tolerances, Qnity Electronics (PDF)", "id": "Table 2 (mechanical, HN, footnote applies to HPP-ST), Table 3 (electrical, HN), Table 5 (HPP-ST shrinkage)", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/599767bd7af84d92827184ea3728c2b3?v=5670ee5b", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" } }, { "benchmark": "dielectric_constant", "label": "Dielectric constant at 1 kHz, Kapton 100HPP-ST", "value": 3.4, "bound": "exact", "unit": "-", "scope": "material", "conditions": { "grade": "Kapton 100HPP-ST, 25.4 µm film", "frequency": "1 kHz" }, "method": "Typical value printed on the manufacturer product page. The summary PDF Table 7 prints 3.4 at 1 kHz for 25 µm HN and HPP-ST by ASTM D-150.", "status": "ground", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST Product Properties table, row Kapton 100HPP-ST, Dielectric Constant @ 1 kHz", "source_detail": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" } }, { "benchmark": "dissipation_factor", "label": "Dissipation factor at 1 kHz, 25 µm film", "value": 0.0018, "bound": "exact", "unit": "-", "scope": "material", "conditions": { "grade": "Kapton HN and HPP-ST, 25 µm (1 mil) film", "frequency": "1 kHz" }, "method": "Typical value by ASTM D-150, as printed in the summary PDF", "status": "ground", "source": "qnity-kapton-summary", "where": "Table 7, Typical Electrical Properties of Kapton Type HN and HPP-ST Films, Dissipation Factor, 25 µm (1 mil) row", "source_detail": { "title": "Kapton Summary of Properties, Qnity Electronics (PDF)", "id": "Table 3 (HPP-ST), Table 7 (electrical, HN and HPP-ST), Table 10 (chemical, HN), Safety and Handling", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/810b258c62404e42855984f345fdf8d7?v=a2916962", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" } }, { "benchmark": "thermal_conductivity", "label": "Thermal conductivity, Kapton 100HPP-ST", "value": 0.12, "bound": "exact", "unit": "W/mK", "scope": "material", "conditions": { "grade": "Kapton 100HPP-ST, 25.4 µm film" }, "method": "Typical value printed on the manufacturer product page. The page text read does not map a test standard to this column. A different value for Type 100 HN is in the summary PDF (see gaps).", "status": "ground", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST Product Properties table, row Kapton 100HPP-ST, Thermal Conductivity (W/mK)", "source_detail": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" } }, { "benchmark": "limiting_oxygen_index", "label": "Limiting oxygen index, 25 µm HPP-ST film", "value": 37, "bound": "exact", "unit": "%", "scope": "material", "conditions": { "grade": "Kapton HPP-ST, 25 µm (1 mil) film" }, "method": "Typical value by ASTM D-2863, as printed in the summary PDF. Not a canonical name in property-canon, so the custom name limiting_oxygen_index is used.", "status": "ground", "source": "qnity-kapton-summary", "where": "Table 3, Physical and Thermal Properties of Kapton Type HPP-ST Film, Limiting Oxygen Index % row, 25 µm column", "source_detail": { "title": "Kapton Summary of Properties, Qnity Electronics (PDF)", "id": "Table 3 (HPP-ST), Table 7 (electrical, HN and HPP-ST), Table 10 (chemical, HN), Safety and Handling", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/810b258c62404e42855984f345fdf8d7?v=a2916962", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" } }, { "benchmark": "thermal_shrinkage", "label": "Shrinkage after 30 min at 150 °C, 25 µm HPP-ST film", "value": 0.03, "bound": "exact", "unit": "%", "scope": "material", "conditions": { "grade": "Kapton HPP-ST, 25 µm (1 mil) film", "temperature": "150 °C", "time": "30 min" }, "method": "Typical value by IPC TM 650 Method 2.2.4A, as printed in the summary PDF", "status": "ground", "source": "qnity-kapton-summary", "where": "Table 3, Physical and Thermal Properties of Kapton Type HPP-ST Film, Shrinkage % 30 min at 150°C row, 25 µm column", "source_detail": { "title": "Kapton Summary of Properties, Qnity Electronics (PDF)", "id": "Table 3 (HPP-ST), Table 7 (electrical, HN and HPP-ST), Table 10 (chemical, HN), Safety and Handling", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/810b258c62404e42855984f345fdf8d7?v=a2916962", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" } }, { "benchmark": "thermal_shrinkage", "label": "Shrinkage maximum at 200 °C for 1 h, 25.4 µm HPP-ST film, MD and TD", "value": 0.1, "bound": "exact", "unit": "%", "scope": "material", "conditions": { "grade": "Kapton HPP-ST, 1.00 mil (25.4 µm) film", "temperature": "200 °C", "time": "1 hr", "direction": "MD and TD, maximum" }, "method": "Specification maximum (max.) for HPP-ST, as printed in the Table 5 shrinkage test method", "status": "ground", "source": "qnity-kapton-spec", "where": "Table 5, Shrinkage of Kapton HPP-ST polyimide film, row Shrinkage %, MD and TD at 200°C (392°F) max., column 1.00 (25.4)", "source_detail": { "title": "Kapton polyimide film specifications and tolerances, Qnity Electronics (PDF)", "id": "Table 2 (mechanical, HN, footnote applies to HPP-ST), Table 3 (electrical, HN), Table 5 (HPP-ST shrinkage)", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/599767bd7af84d92827184ea3728c2b3?v=5670ee5b", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" } }, { "benchmark": "relative_thermal_index", "label": "UL electrical relative thermal index, Kapton HPP-ST", "value": 240, "bound": "exact", "unit": "°C", "scope": "material", "conditions": { "grade": "Kapton HPP-ST", "standard": "UL 746B, electrical" }, "method": "Rating printed on the manufacturer product page under Electrical, UL Electrical RTI. A rating, not a continuous service limit.", "status": "ground", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST Product Properties classification block, Electrical group, UL Electrical RTI (°C) row", "source_detail": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" } }, { "benchmark": "relative_thermal_index", "label": "UL mechanical relative thermal index, Kapton HPP-ST", "value": 200, "bound": "exact", "unit": "°C", "scope": "material", "conditions": { "grade": "Kapton HPP-ST", "standard": "UL 746B, mechanical strength" }, "method": "Rating printed on the manufacturer product page under Mechanical, UL Mechanical Strength RTI. A rating, not a continuous service limit.", "status": "ground", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST Product Properties classification block, Mechanical group, UL Mechanical Strength RTI (°C) row", "source_detail": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" } } ], "corrosion": [ { "environment": "Low Earth orbit, atomic oxygen", "headline": "NASA's erosion study ranks Kapton H as eroding more than fluoropolymers, and no HPP-ST erosion yield was recorded.", "effect": "The NASA report says some polymers, such as the fluoropolymers, had low erosion yields compared with polyimide Kapton H. Kapton HPP-ST is a different grade, so its erosion yield is not recorded in this profile.", "rating": "moderate", "conditions": { "basis": "Kapton H, a different grade from HPP-ST, exposed in low Earth orbit on MISSE 2 per the NASA report" }, "source": "nasa-tm-2008-215490", "where": "Introduction, paragraph beginning \"As LEO erosion yield data gradually became available\"" }, { "environment": "Heat in air at 325 °C, Type HN film", "headline": "The summary PDF plots strength and elongation retained after air ageing at 325 °C, for Type HN and not HPP-ST.", "effect": "Figures 6 and 7 plot tensile strength and elongation retained for 25 µm Type HN film after ageing in air at 325 °C. The retention values sit on the curves and are not printed as numbers in the text, so no retention figure is recorded.", "rating": "unknown", "conditions": { "basis": "Type HN film, 25 µm (1 mil), not HPP-ST" }, "source": "qnity-kapton-summary", "where": "Figures 6 and 7, Thermal Aging section" }, { "environment": "Solvents and 2 N hydrochloric acid, 10 min at 23 °C, Type HN film", "headline": "Type HN keeps most of its tensile strength in common solvents, and hydrochloric acid gives the lowest retention in Table 10.", "effect": "Table 10 prints tensile retained after isopropyl alcohol, toluene, methyl ethyl ketone, methylene chloride with trichloroethylene, and 2 N hydrochloric acid. The summary says HPP-ST chemical properties are similar to HN; this is a statement, not a test on HPP-ST.", "rating": "low", "conditions": { "basis": "Typical values for Type HN film, 25 µm (1 mil); HPP-ST described as similar" }, "source": "qnity-kapton-summary", "where": "Table 10, Chemical Properties of Kapton Type HN Film, 25 µm, and the paragraph before it" }, { "environment": "Hot water at 100 °C, Type HN film", "headline": "Strength and elongation after exposure to 100 °C water are plotted for HN, and no HPP-ST water-exposure value was read.", "effect": "Figures 3 and 4 plot tensile strength and ultimate elongation after exposure to 100 °C water for 25 µm Type HN film.", "rating": "unknown", "conditions": { "basis": "Type HN film, 25 µm (1 mil), not HPP-ST" }, "source": "qnity-kapton-summary", "where": "Figures 3 and 4, mechanical properties section" } ], "risks": { "hazards": [ { "text": "The summary PDF says Kapton is unlikely to add appreciably to fire hazards in storage or use. Bulk quantities over 100 lb should be stored away from flammable materials, and firefighters should use a fresh air supply or respirator.", "ghs": [], "source": "qnity-kapton-summary", "where": "Safety and Handling, Fire Hazards" }, { "text": "The summary PDF says processing can generate a strong static charge, which can build to many thousands of volts. In dust- or solvent-laden air, a flash fire or explosion could result.", "ghs": [], "source": "qnity-kapton-summary", "where": "Safety and Handling, Static Electricity" }, { "text": "The monomer pyromellitic dianhydride carries GHS signal word Danger, with hazard statements H317, H318 and H334.", "ghs": [ "H317", "H318", "H334" ], "source": "wikipedia-pmda", "where": "Chembox, Hazards section" }, { "text": "The monomer 4,4'-oxydianiline carries GHS signal word Danger, with hazard statements H301, H311, H331, H340, H350, H361f and H411.", "ghs": [ "H301", "H311", "H331", "H340", "H350", "H361f", "H411" ], "source": "wikipedia-oda", "where": "Chembox, Hazards section" } ], "failure_risks": [ { "mode": "Atomic oxygen erosion in low Earth orbit", "trigger": "Polyimide film exposed to atomic oxygen in low Earth orbit", "consequence": "NASA ranks Kapton H as eroding more than fluoropolymers, so bare film would need cover. No HPP-ST erosion yield was recorded.", "severity": "moderate", "source": "nasa-tm-2008-215490", "where": "Introduction, erosion comparison paragraph" }, { "mode": "Strength loss after heat ageing in air", "trigger": "Air ageing at 325 °C, Type HN data", "consequence": "Strength and elongation retention are plotted for HN and are not printed as HPP-ST values, so the HPP-ST margin is not recorded.", "severity": "moderate", "source": "qnity-kapton-summary", "where": "Figures 6 and 7, Thermal Aging section" }, { "mode": "Dielectric breakdown of thin film", "trigger": "AC voltage above the breakdown value on 25.4 µm film", "consequence": "The minimum breakdown for 25.4 µm film is 236 kV/mm (ASTM D-149), so a design margin is needed above that value.", "severity": "moderate", "source": "qnity-kapton-spec", "where": "Table 3, Electrical Properties of Kapton HN polyimide film, column 1.00 (25.4)" } ], "side_effects": [], "handling": [ { "text": "The summary PDF says soldering rarely produces off-gases of toxicological significance, and that a heated element can remove insulation.", "source": "qnity-kapton-summary" }, { "text": "Use adequate ventilation when handling Kapton at high temperatures, and remove the film from equipment before direct welding.", "source": "qnity-kapton-summary" } ], "mitigations": [] }, "uses": [ { "application": "electronics-and-chips", "device": "Flexible printed circuit substrate and PCB stencil", "example": "The product page lists electronic parts, printed circuit board stencils, screen printing and insulation tubing as applications for Kapton HPP-ST.", "source": "qnity-hpp-st-page", "where": "Kapton HPP-ST product page, Applications list" }, { "application": "solar-arrays", "device": "Spacecraft solar array and thermal management film (Kapton family)", "example": "The summary PDF says Kapton is used in applications such as the solar array and for thermal management in the United States space program. This describes the Kapton family, not HPP-ST alone.", "source": "qnity-kapton-summary", "where": "Opening paragraph of the Summary of Properties, page 1" } ], "supply": [ { "subject": "Kapton HPP-ST film (manufacturer)", "producers": [], "critical_lists": [], "substitutes": [], "source": "wikipedia-kapton", "where": "History (manufacturer as of November 2025); 3D printing section (polyamic acid precursor); summary PDF, Types of Kapton" }, { "subject": "Pyromellitic dianhydride (PMDA), dianhydride monomer", "producers": [], "critical_lists": [], "substitutes": [], "source": "wikipedia-pmda", "where": "Preparation section; Chembox" }, { "subject": "4,4'-Oxydianiline (ODA), diamine monomer", "producers": [], "critical_lists": [], "substitutes": [], "source": "wikipedia-oda", "where": "Uses section" } ], "media": [], "documents": [ { "title": "Qnity Electronics product page, Kapton HPP-ST polyimide film (Product Properties table)", "type": "datasheet", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026 }, { "title": "Qnity Electronics, Kapton Summary of Properties (PDF)", "type": "datasheet", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/810b258c62404e42855984f345fdf8d7?v=a2916962" }, { "title": "Qnity Electronics, Kapton polyimide film specifications and tolerances (PDF)", "type": "datasheet", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/599767bd7af84d92827184ea3728c2b3?v=5670ee5b" }, { "title": "Banks, de Groh and Backus, Atomic Oxygen Erosion Yield Predictive Tool for Spacecraft Polymers in Low Earth Orbit, NASA/TM-2008-215490", "type": "report", "url": "https://ntrs.nasa.gov/citations/20090011780", "year": 2008 } ], "gaps": [ "No HPP-ST value was read for coefficient of thermal expansion, glass transition, specific heat or melting point. The summary PDF prints these for Type 100 HN only, and it gives the melting point as None (ASTM E-794).", "Atomic oxygen erosion yields for Kapton H and HN in NASA/TM-2008-215490 are printed in exponent form, so they are not recorded here. No HPP-ST erosion yield was read.", "Radiation, UV and outgassing data for HPP-ST were not read as HPP-ST values. The summary's radiation and chemical tables are for Type HN, and the summary says HPP-ST chemical properties are similar to HN.", "Thermal conductivity conflicts across grades: the product page gives 0.12 W/mK for 100HPP-ST, and the summary PDF gives 0.20 W/m K for Type 100 HN. The HN value is a different grade, so only the HPP-ST value is recorded.", "The product page does not map a test standard to each column in the text read, so the method on those rows says so. Where the summary PDF prints the same value by a named standard, that is cited in the method.", "Limiting oxygen index and relative thermal index are not canonical names in property-canon.yaml, so custom names are used.", "Producer shares, country splits and tonnage for Kapton film were not found in any source read. Qnity Electronics is named as the manufacturer, and the monomers have no producer figures.", "No Qnity safety data sheet for HPP-ST was read. Hazard entries come from the summary PDF safety section and from the Wikipedia Chembox data for the two monomers.", "Moisture absorption is printed as two values for HN and HPP-ST in the summary PDF with no clear row label in the text read, so it is not recorded.", "Tear strength (Elmendorf and Graves) and folding endurance for 25 µm HPP-ST are printed in the summary PDF Table 3 but have no canonical property name, so they are not recorded." ], "story": { "why": "Kapton HPP-ST is an all-polyimide film from Qnity Electronics with a surface treatment for adhesion. The 100HPP-ST grade (25.4 µm, 1 mil) has a tensile strength of 231.0 MPa and an elongation at break of 72 % at 23 °C, as printed on the manufacturer product page. Its dielectric strength is 303 kV/mm, and the specification caps shrinkage at 0.10 % after 1 hour at 200 °C.", "uses": [ { "where": "Use", "line": "Flexible printed circuit substrate and PCB stencil film, with screen printing and insulation tubing, as listed on the product page." }, { "where": "Use", "line": "Spacecraft solar array and thermal management film, in the Kapton family, as stated in the summary PDF." } ], "can_do": [ { "label": "Carry a thin load", "line": "231.0 MPa tensile strength and 72 % elongation at break at 23 °C for 100HPP-ST (product page).", "scope": "material" }, { "label": "Hold its shape in heat", "line": "shrinkage at most 0.10 % after 1 hour at 200 °C (specification Table 5, 25.4 µm).", "scope": "material" }, { "label": "Insulate a thin film", "line": "303 kV/mm dielectric strength and a dielectric constant of 3.40 at 1 kHz for 100HPP-ST.", "scope": "material" }, { "label": "Burn slowly", "line": "limiting oxygen index of 37 % for 25 µm HPP-ST (ASTM D-2863, summary PDF).", "scope": "material" } ], "compare": "Every value here is for one manufacturer's HPP-ST film, read from its product page and summary PDF, so the figures are typical or specification values, not a ranking against other polyimide films. The 231.0 MPa tensile strength and 1.42 g/cc density are typical for 25 µm film, and the 165 MPa minimum is the specification floor for the same thickness. The 303 kV/mm dielectric strength is typical, against a 236 kV/mm minimum.", "compare_rows": [ { "label": "Density", "benchmark": "density", "scope": "material" }, { "label": "Tensile strength", "benchmark": "ultimate_tensile_strength", "scope": "material" }, { "label": "Dielectric strength", "benchmark": "dielectric_strength", "scope": "material" } ], "handling": [ "Name the grade, since HPP-ST and HN share some values but the surface treatment and shrinkage limits differ.", "Check the current supplier data sheet, since the product page and summary PDF give typical values with no test standard for each column.", "Keep film in a ventilated area when heating or welding, and remove it from equipment before direct welding." ], "good_for": [ "Flexible circuit and stencil films where adhesion treatment and 231.0 MPa tensile strength at 23 °C matter.", "Thin insulation at high voltage: 303 kV/mm dielectric strength at 25.4 µm, from the product page." ], "watch_out": [ "Heat rating under load: the relative thermal indices are 240 °C (electrical) and 200 °C (mechanical) under UL 746B. These are ratings, not service limits.", "Atomic oxygen: NASA ranks Kapton H as eroding more than fluoropolymers in low Earth orbit. No HPP-ST erosion yield was recorded.", "Thermal conductivity: the product page gives 0.12 W/mK for 100HPP-ST, and the summary PDF gives a different value for Type 100 HN." ], "verdict": "Kapton HPP-ST is a 25.4 µm all-polyimide film with a tensile strength of 231.0 MPa, an elongation at break of 72 % and a dielectric strength of 303 kV/mm at 23 °C, per the manufacturer. Its heat ratings are UL 746B indices, and no HPP-ST data for in-orbit erosion or ageing were read.", "recipe": { "line": "Kapton HPP-ST is a polyimide film. Wikipedia says Kapton is produced by condensation of pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA). The NASA report prints the repeat unit as C22H10O5N2 for Kapton H and HN, and the manufacturer describes HPP-ST as an all-polyimide film with the properties of Type HN.", "parts": [ { "name": "Carbon", "symbol": "C", "role": "22 carbon atoms per repeat unit (C22H10O5N2, NASA report): the aromatic rings of the dianhydride and diamine units, plus the imide carbonyl carbons." }, { "name": "Hydrogen", "symbol": "H", "role": "10 hydrogen atoms per repeat unit (C22H10O5N2, NASA report), on the aromatic rings." }, { "name": "Oxygen", "symbol": "O", "role": "5 oxygen atoms per repeat unit (C22H10O5N2, NASA report): the carbonyl oxygens of the imide rings and the ether oxygen of the oxydiphenylene unit." }, { "name": "Nitrogen", "symbol": "N", "role": "2 nitrogen atoms per repeat unit (C22H10O5N2, NASA report): the imide nitrogens that join the dianhydride and diamine units." } ] }, "risk_groups": [ { "title": "For people", "lead": "The finished film has no GHS classification printed in the sources read, but its two monomers carry GHS Danger hazard statements.", "points": [ { "label": "Film", "line": "The summary PDF says Kapton is unlikely to add appreciably to fire hazards in storage or use. Bulk quantities over 100 lb should be kept away from flammable materials." }, { "label": "Static", "line": "Processing can generate a strong static charge, which can build to many thousands of volts and cause a flash fire in dust or solvent-laden air." }, { "label": "Monomers", "line": "Pyromellitic dianhydride carries Danger with H317, H318 and H334. 4,4'-oxydianiline carries Danger with H301, H311, H331, H340, H350, H361f and H411 (Wikipedia Chembox)." } ], "level": 0, "verdict": "Film low hazard; monomers GHS Danger" }, { "title": "If it fails", "lead": "The failure routes in these sources are atomic oxygen erosion in low Earth orbit and strength loss after heat ageing for HN.", "points": [ { "label": "Atomic oxygen", "line": "NASA ranks Kapton H as eroding more than fluoropolymers in low Earth orbit. No HPP-ST erosion yield was recorded, because the NASA values are printed in exponent form." }, { "label": "Heat", "line": "The summary PDF plots strength retained after air ageing at 325 °C for Type HN, not HPP-ST." } ], "level": 1, "verdict": "Erosion in orbit; heat ageing shown for HN" } ] }, "updated": "2026-11-01", "review": { "status": "draft", "method": "assistant", "checked_values": 15, "unreachable": 0, "caveats": 3, "note": "Values were read by an AI assistant on 2026-11-01 from the pages named in each entry. Product-page values are typical values with no test standard mapped to each column in the text read. Minimum and maximum values come from the specification PDF and apply to HN and HPP-ST by its footnote. The thermal conductivity value is for 100HPP-ST only." }, "sources": { "qnity-hpp-st-page": { "title": "Kapton HPP-ST polyimide film, Qnity Electronics product page", "id": "Product Properties table (row Kapton 100HPP-ST), Classification block, Applications list", "url": "https://www.qnityelectronics.com/products/kapton-hpp-st-polyimide-film", "year": 2026, "kind": "datasheet", "license": "manufacturer web page, linked not reproduced" }, "qnity-kapton-summary": { "title": "Kapton Summary of Properties, Qnity Electronics (PDF)", "id": "Table 3 (HPP-ST), Table 7 (electrical, HN and HPP-ST), Table 10 (chemical, HN), Safety and Handling", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/810b258c62404e42855984f345fdf8d7?v=a2916962", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" }, "qnity-kapton-spec": { "title": "Kapton polyimide film specifications and tolerances, Qnity Electronics (PDF)", "id": "Table 2 (mechanical, HN, footnote applies to HPP-ST), Table 3 (electrical, HN), Table 5 (HPP-ST shrinkage)", "url": "https://ekce-p-001.sitecorecontenthub.cloud/api/public/content/599767bd7af84d92827184ea3728c2b3?v=5670ee5b", "kind": "datasheet", "license": "manufacturer PDF, linked not reproduced" }, "nasa-tm-2008-215490": { "title": "Atomic Oxygen Erosion Yield Predictive Tool for Spacecraft Polymers in Low Earth Orbit", "id": "NASA/TM-2008-215490 (Banks, de Groh and Backus, 2008), NTRS 20090011780", "url": "https://ntrs.nasa.gov/citations/20090011780", "year": 2008, "kind": "report", "license": "NASA public document" }, "wikipedia-kapton": { "title": "Kapton, Wikipedia", "id": "Kapton article, History, Chemistry and variants, Usage (Spacecraft), 3D printing", "url": "https://en.wikipedia.org/wiki/Kapton", "kind": "web", "license": "CC BY-SA 4.0, linked not reproduced" }, "wikipedia-polyimide": { "title": "Polyimide, Wikipedia", "id": "Polyimide article, lead section (Kapton condensation of PMDA and ODA)", "url": "https://en.wikipedia.org/wiki/Polyimide", "kind": "web", "license": "CC BY-SA 4.0, linked not reproduced" }, "wikipedia-pmda": { "title": "Pyromellitic dianhydride, Wikipedia", "id": "Chembox (identifiers, properties, GHS hazards), Preparation section", "url": "https://en.wikipedia.org/wiki/Pyromellitic_dianhydride", "kind": "web", "license": "CC BY-SA 4.0, linked not reproduced" }, "wikipedia-oda": { "title": "4,4'-Oxydianiline, Wikipedia", "id": "Chembox (identifiers, properties, GHS hazards), Uses section", "url": "https://en.wikipedia.org/wiki/4,4%27-Oxydianiline", "kind": "web", "license": "CC BY-SA 4.0, linked not reproduced" } }, "license": "CC-BY-4.0", "url": "https://spacemushroom.com/profiles/pi-kapton-hpp-st/" }