{
  "spore": "profile",
  "id": "tenax-hta",
  "spore_version": "0.2",
  "family": "carbon-materials",
  "name": "Tenax HTA carbon fibre",
  "abbreviation": "HTA40",
  "role": "reinforcing fibre",
  "category": "carbon",
  "type": "carbon-fiber",
  "summary": "Tenax HTA40 is a Teijin carbon fibre filament in the standard-modulus group. Teijin's typical values for the E13 3K 200tex 15Z product give a tensile strength of 4100 MPa and a tensile modulus of 240 GPa on bare filament, with a density of 1.77 g/cm3. Teijin also lists a PEEK laminate built from HTA40 fabric, with a tensile strength of 963 MPa in the 0 degree direction. The sources read give no HTA40 data for oxidation, ageing or outgassing, and the only safety data sheet read is for a different carbon thread product.\n",
  "best_for": "Stiffness and strength along the fibre at a density of 1.77 g/cm3 (Teijin typical values for Tenax HTA40)",
  "weakest_at": "No HTA40 ageing, oxidation or outgassing data in the sources read, and no grade-specific hazard data",
  "identity": {
    "formula": "Carbon filament, composed mostly of carbon atoms (Wikipedia definition); no composition for HTA40 is printed in the sources read",
    "designations": [
      {
        "system": "Trade name",
        "code": "Tenax",
        "source": "teijin-overview",
        "where": "Document title, Tenax filament yarn overview"
      },
      {
        "system": "Trade name",
        "code": "HTA40",
        "source": "teijin-overview",
        "where": "Fiber family column, HTA40 rows"
      },
      {
        "system": "Trade name",
        "code": "HTA40 E13 3K 200tex",
        "source": "teijin-tpwf-laminate",
        "where": "Carbon Fiber line of the PEEK laminate data sheet"
      }
    ],
    "source": "teijin-overview",
    "where": "Product overview, HTA40 rows (grade, filament count, yield and filament diameter columns); composition from the Wikipedia Carbon fibers article"
  },
  "tags": {
    "environments": [],
    "stresses": [],
    "applications": [
      "structures"
    ]
  },
  "properties": [
    {
      "benchmark": "ultimate_tensile_strength",
      "label": "Tensile strength, Tenax HTA40 E13 3K 200tex 15Z fibre",
      "value": 4100,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "fibre": "Tenax HTA40 E13 3K 200tex 15Z, bare filament",
        "basis": "typical value, as the Teijin overview states that all data are typical values"
      },
      "method": "Typical value printed in the Teijin product overview, MPa column",
      "status": "ground",
      "source": "teijin-overview",
      "where": "Product overview table, row HTA40 E13 3K 200tex 15Z, tensile strength columns",
      "source_detail": {
        "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
        "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "elastic_modulus",
      "label": "Tensile modulus, Tenax HTA40 E13 3K 200tex 15Z fibre (first test method)",
      "value": 240,
      "bound": "exact",
      "unit": "GPa",
      "scope": "material",
      "conditions": {
        "fibre": "Tenax HTA40 E13 3K 200tex 15Z, bare filament",
        "basis": "first printed modulus pair in the row"
      },
      "method": "Typical value printed in the Teijin product overview, GPa column",
      "status": "ground",
      "source": "teijin-overview",
      "where": "Product overview table, row HTA40 E13 3K 200tex 15Z, tensile modulus columns",
      "source_detail": {
        "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
        "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "elastic_modulus",
      "label": "Tensile modulus, Tenax HTA40 E13 3K 200tex 15Z fibre (second test method)",
      "value": 230,
      "bound": "exact",
      "unit": "GPa",
      "scope": "material",
      "conditions": {
        "fibre": "Tenax HTA40 E13 3K 200tex 15Z, bare filament",
        "basis": "second test method printed in the same row; the Teijin overview gives a different test method for this pair"
      },
      "method": "Typical value printed in the Teijin product overview, second modulus pair in the row",
      "status": "ground",
      "note": "The overview prints two moduli for this row. The first pair (240 GPa) is the one used in the story.",
      "source": "teijin-overview",
      "where": "Product overview table, row HTA40 E13 3K 200tex 15Z, second tensile modulus pair",
      "source_detail": {
        "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
        "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "elongation",
      "label": "Elongation at break, Tenax HTA40 E13 3K 200tex 15Z fibre",
      "value": 1.7,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "fibre": "Tenax HTA40 E13 3K 200tex 15Z, bare filament"
      },
      "method": "Typical value printed in the Teijin product overview",
      "status": "ground",
      "source": "teijin-overview",
      "where": "Product overview table, row HTA40 E13 3K 200tex 15Z, elongation at break column",
      "source_detail": {
        "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
        "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "density",
      "label": "Density, Tenax HTA40 E13 3K 200tex 15Z fibre",
      "value": 1.77,
      "bound": "exact",
      "unit": "g/cm3",
      "scope": "material",
      "conditions": {
        "fibre": "Tenax HTA40 E13 3K 200tex 15Z, bare filament"
      },
      "method": "Typical value printed in the Teijin product overview; the PEEK laminate data sheet prints the same 1.77 g/cm3 for the HTA40 E13 3K 200tex fibre",
      "status": "ground",
      "source": "teijin-overview",
      "where": "Product overview table, row HTA40 E13 3K 200tex 15Z, density column",
      "source_detail": {
        "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
        "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "filament_diameter",
      "label": "Filament diameter, Tenax HTA40 fibre",
      "value": 7,
      "bound": "exact",
      "unit": "µm",
      "scope": "material",
      "conditions": {
        "fibre": "Tenax HTA40 E13 3K 200tex 15Z"
      },
      "method": "Value printed in the Teijin product overview, filament diameter column (not in the property canon; snake_case name used)",
      "status": "ground",
      "source": "teijin-overview",
      "where": "Product overview table, row HTA40 E13 3K 200tex 15Z, filament diameter column",
      "source_detail": {
        "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
        "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "linear_density",
      "label": "Linear density (yield without sizing), Tenax HTA40 E13 3K fibre",
      "value": 200,
      "bound": "exact",
      "unit": "tex",
      "scope": "material",
      "conditions": {
        "fibre": "Tenax HTA40 E13 3K, before sizing"
      },
      "method": "Printed yield value in the Teijin product overview; the German sheet gives the same value under Garnfeinheit (ohne Präparation)",
      "status": "ground",
      "note": "Not in the property canon; snake_case name used. The 1K and 6K HTA40 tows have their own yield values in the same table and are not profiled here.",
      "source": "teijin-overview",
      "where": "Product overview table, row HTA40 E13 3K 200tex 15Z, yield (without sizing) column",
      "source_detail": {
        "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
        "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "sizing_content",
      "label": "Sizing level, Tenax HTA40 E13 3K 200tex 15Z fibre",
      "value": 1.3,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "fibre": "Tenax HTA40 E13 3K 200tex 15Z",
        "sizing_type": "EP as printed in the overview"
      },
      "method": "Value printed in the Teijin product overview, size level column (not in the property canon; snake_case name used)",
      "status": "ground",
      "source": "teijin-overview",
      "where": "Product overview table, row HTA40 E13 3K 200tex 15Z, sizing and size level columns",
      "source_detail": {
        "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
        "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "ultimate_tensile_strength",
      "label": "Tensile strength, Tenax-E PEEK laminate with HTA40 fabric (0 degree direction)",
      "value": 963,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "material": "Laminate, not the bare fibre: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (PEEK matrix, 5HS fabric)",
        "direction": "0 degree",
        "test": "EN ISO 527-4",
        "conditioning": "23 °C / 50 % r.h."
      },
      "method": "Typical value printed in the Teijin laminate data sheet, tensile strength (0 degree) row",
      "status": "ground",
      "source": "teijin-tpwf-laminate",
      "where": "Properties table, Tensile (0 degree), strength row",
      "source_detail": {
        "title": "Product data sheet: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (Teijin Carbon)",
        "id": "Teijin, product key 6200, version 1.2, dated 2022-03-01",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/ThermoPlastics/TPWF/PEEK/Product_Data_Sheet_TSPTP201__6200_Tenax%E2%84%A2-E_TPWF_PEEK-4-42-HTA40_E13_3K_DT-5HS-285_.pdf",
        "year": 2022,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "elastic_modulus",
      "label": "Tensile modulus, Tenax-E PEEK laminate with HTA40 fabric (0 degree direction)",
      "value": 60,
      "bound": "exact",
      "unit": "GPa",
      "scope": "material",
      "conditions": {
        "material": "Laminate, not the bare fibre: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285",
        "direction": "0 degree",
        "test": "EN ISO 527-4",
        "conditioning": "23 °C / 50 % r.h."
      },
      "method": "Typical value printed in the Teijin laminate data sheet, modulus row under tensile",
      "status": "ground",
      "source": "teijin-tpwf-laminate",
      "where": "Properties table, Tensile (0 degree), modulus row",
      "source_detail": {
        "title": "Product data sheet: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (Teijin Carbon)",
        "id": "Teijin, product key 6200, version 1.2, dated 2022-03-01",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/ThermoPlastics/TPWF/PEEK/Product_Data_Sheet_TSPTP201__6200_Tenax%E2%84%A2-E_TPWF_PEEK-4-42-HTA40_E13_3K_DT-5HS-285_.pdf",
        "year": 2022,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "flexural_strength",
      "label": "Flexural strength, Tenax-E PEEK laminate with HTA40 fabric (0 degree direction)",
      "value": 1166,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "material": "Laminate, not the bare fibre: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285",
        "direction": "0 degree",
        "test": "EN 2562 A",
        "conditioning": "23 °C / 50 % r.h."
      },
      "method": "Typical value printed in the Teijin laminate data sheet, flexure strength row",
      "status": "ground",
      "source": "teijin-tpwf-laminate",
      "where": "Properties table, Flexure (0 degree), strength row",
      "source_detail": {
        "title": "Product data sheet: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (Teijin Carbon)",
        "id": "Teijin, product key 6200, version 1.2, dated 2022-03-01",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/ThermoPlastics/TPWF/PEEK/Product_Data_Sheet_TSPTP201__6200_Tenax%E2%84%A2-E_TPWF_PEEK-4-42-HTA40_E13_3K_DT-5HS-285_.pdf",
        "year": 2022,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "flexural_modulus",
      "label": "Flexural modulus, Tenax-E PEEK laminate with HTA40 fabric (0 degree direction)",
      "value": 64,
      "bound": "exact",
      "unit": "GPa",
      "scope": "material",
      "conditions": {
        "material": "Laminate, not the bare fibre: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285",
        "direction": "0 degree",
        "test": "EN 2562 A",
        "conditioning": "23 °C / 50 % r.h."
      },
      "method": "Typical value printed in the Teijin laminate data sheet, flexure modulus row",
      "status": "ground",
      "source": "teijin-tpwf-laminate",
      "where": "Properties table, Flexure (0 degree), modulus row",
      "source_detail": {
        "title": "Product data sheet: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (Teijin Carbon)",
        "id": "Teijin, product key 6200, version 1.2, dated 2022-03-01",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/ThermoPlastics/TPWF/PEEK/Product_Data_Sheet_TSPTP201__6200_Tenax%E2%84%A2-E_TPWF_PEEK-4-42-HTA40_E13_3K_DT-5HS-285_.pdf",
        "year": 2022,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "compressive_strength",
      "label": "Compression strength, Tenax-E PEEK laminate with HTA40 fabric (0 degree direction)",
      "value": 725,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "material": "Laminate, not the bare fibre: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285",
        "direction": "0 degree",
        "test": "EN 2850 B1/B2",
        "conditioning": "23 °C / 50 % r.h."
      },
      "method": "Typical value printed in the Teijin laminate data sheet, compression strength row (not in the property canon; snake_case name used)",
      "status": "ground",
      "source": "teijin-tpwf-laminate",
      "where": "Properties table, Compression (0 degree), strength row",
      "source_detail": {
        "title": "Product data sheet: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (Teijin Carbon)",
        "id": "Teijin, product key 6200, version 1.2, dated 2022-03-01",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/ThermoPlastics/TPWF/PEEK/Product_Data_Sheet_TSPTP201__6200_Tenax%E2%84%A2-E_TPWF_PEEK-4-42-HTA40_E13_3K_DT-5HS-285_.pdf",
        "year": 2022,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    },
    {
      "benchmark": "glass_transition_temperature",
      "label": "Glass transition temperature, Tenax-E PEEK laminate with HTA40 fabric",
      "value": 143,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "material": "Laminate, not the bare fibre: PEEK matrix of Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285",
        "test": "ISO 11357",
        "conditioning": "23 °C / 50 % r.h."
      },
      "method": "Typical value printed in the Teijin laminate data sheet, glass transition row",
      "status": "ground",
      "source": "teijin-tpwf-laminate",
      "where": "Properties table, Glass Transition Temperature row",
      "source_detail": {
        "title": "Product data sheet: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (Teijin Carbon)",
        "id": "Teijin, product key 6200, version 1.2, dated 2022-03-01",
        "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/ThermoPlastics/TPWF/PEEK/Product_Data_Sheet_TSPTP201__6200_Tenax%E2%84%A2-E_TPWF_PEEK-4-42-HTA40_E13_3K_DT-5HS-285_.pdf",
        "year": 2022,
        "kind": "datasheet",
        "license": "manufacturer datasheet, values quoted for reference"
      }
    }
  ],
  "corrosion": [],
  "risks": {
    "hazards": [
      {
        "text": "The Rave safety data sheet for a high-purity carbon fibre thread (a different product from Tenax HTA40, sold under CAS 7782-42-5) says the substance does not meet the criteria for classification.",
        "ghs": [],
        "source": "rave-cf-sds",
        "where": "Section 2.1 (classification)"
      },
      {
        "text": "The same Rave sheet says inhalation of dust may irritate the respiratory system and dust can cause eye irritation.",
        "ghs": [],
        "source": "rave-cf-sds",
        "where": "Section 11 (symptoms related to toxicological characteristics)"
      }
    ],
    "failure_risks": [
      {
        "mode": "Violent reaction with strong oxidisers",
        "trigger": "Contact with strong oxidisers or peroxides (incompatible materials)",
        "consequence": "The Rave sheet says violent reactions may occur. The sheet is for a generic high-purity thread, not for Tenax HTA40.",
        "severity": "high",
        "source": "rave-cf-sds",
        "where": "Section 10.3 (possibility of hazardous reactions) and section 10.5 (incompatible materials)"
      }
    ],
    "side_effects": [],
    "handling": [
      {
        "text": "Avoid creating or accumulating dust or fine particles.",
        "source": "rave-cf-sds",
        "where": "Section 10.4 (conditions to avoid) and control procedures"
      },
      {
        "text": "Keep away from strong oxidisers and peroxides.",
        "source": "rave-cf-sds",
        "where": "Section 10.5 (incompatible materials)"
      }
    ],
    "mitigations": []
  },
  "uses": [
    {
      "application": "structures",
      "device": "Aerospace, automotive and industrial parts made from Tenax filament yarn (general Teijin statement; HTA40 is not named)",
      "example": "Teijin says its Tenax filament yarn is used in products made for aerospace, automotive and several industrial applications.",
      "source": "teijin-filament-page",
      "where": "Introduction paragraph of the filament yarn page"
    },
    {
      "application": "structures",
      "device": "PEEK thermoplastic laminate with HTA40 fabric (Tenax-E TPWF PEEK HTA40)",
      "example": "Teijin publishes a PEEK laminate built from HTA40 fabric and gives its strength values, but the data sheet names no end use.",
      "source": "teijin-tpwf-laminate",
      "where": "Product data sheet, header block and properties table"
    }
  ],
  "supply": [
    {
      "subject": "Carbon fibre precursor (polyacrylonitrile, rayon or pitch)",
      "abundance": "Not applicable: a synthetic fibre made from a polymer or pitch precursor; Wikipedia lists polyacrylonitrile, rayon and pitch as the precursors.",
      "producers": [],
      "critical_lists": [],
      "substitutes": [],
      "source": "teijin-downloads",
      "where": "Downloads page, certificate sections; PEEK laminate data sheet, header block"
    }
  ],
  "media": [],
  "documents": [
    {
      "title": "Tenax filament yarn product overview (Teijin Carbon, PDS dated 2026-04-15)",
      "type": "datasheet",
      "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
      "year": 2026
    },
    {
      "title": "Produktdatenblatt TSG01de: Tenax filament yarn (Teijin Carbon Europe, 2025-02-15)",
      "type": "datasheet",
      "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/Product_Data_Sheet_TSG01de__EU_Filament__de____DE_.pdf",
      "year": 2025
    },
    {
      "title": "Product data sheet: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (Teijin, version 1.2)",
      "type": "datasheet",
      "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/ThermoPlastics/TPWF/PEEK/Product_Data_Sheet_TSPTP201__6200_Tenax%E2%84%A2-E_TPWF_PEEK-4-42-HTA40_E13_3K_DT-5HS-285_.pdf",
      "year": 2022
    },
    {
      "title": "Safety data sheet: High purity carbon fibers in carbon fiber threads, SDS00170CC1016 v4.0 (Rave Scientific, not a Tenax grade)",
      "type": "sds",
      "url": "https://ravescientific.com/images/pdf/SDS00170CC1016-01_Carbon_Fibre.pdf",
      "year": 2022
    }
  ],
  "gaps": [
    "No ageing, oxidation, UV, atomic-oxygen or outgassing data for Tenax HTA40 fibre was found in the sources read; corrosion is left empty for that reason.",
    "The precursor (polyacrylonitrile, rayon or pitch) and the process used for Tenax HTA40 are not stated in any Teijin page read. Wikipedia lists the general precursors only.",
    "No Teijin safety data sheet for HTA40 was found. The Rave sheet is for a high-purity carbon thread (CAS 7782-42-5), not a Tenax grade, and is used only as a general hazard reference.",
    "The Teijin filament yarn handling recommendation (linked from the downloads page) is an image-only PDF; no text could be extracted from it.",
    "PubChem's GHS summary for acrylonitrile, the precursor monomer, could not be read (the site returned an automated-access check page), so no precursor hazard entry is given.",
    "No production share by country and no production site for the HTA40 fibre itself were found in any source read.",
    "Thermal conductivity, specific heat and coefficient of thermal expansion for Tenax HTA40 were not found. Values for Toray T700S are not used because they are a different fibre.",
    "Matweb's HTA40 datasheet page returned HTTP 403 and was not read.",
    "No UNS, EN or ISO designation for this fibre was found in a source read.",
    "The overview gives typical values only; no minimum or guaranteed values were found.",
    "Filament diameter, linear density (yield) and sizing level are not in the property canon; written as snake_case names. Severity 'high' for the violent-reaction failure mode is assigned by Space Mushroom from the SDS wording.",
    "The laminate rows are PEEK laminate values with HTA40 fabric, not bare-fibre values, and are labelled as such. The Airbus nacelle prepreg mentioned by a search result was not confirmed as HTA40 and is not used."
  ],
  "story": {
    "why": "Tenax HTA40 is a Teijin carbon fibre filament in the standard-modulus group. Teijin's typical values give a tensile strength of 4100 MPa and a tensile modulus of 240 GPa on bare filament. The same row prints 230 GPa on a second test method. The density is 1.77 g/cm3, so stiffness and strength per unit mass are the reason to use it. The sources read give no HTA40 data for oxidation, ageing or outgassing, so the fibre cannot yet be ranked for space use.",
    "uses": [
      {
        "where": "Structures in aerospace, automotive and industrial parts",
        "line": "Teijin says its Tenax filament yarn is used in products made for aerospace, automotive and several industrial applications. The statement covers the filament yarn range as a whole, not HTA40 alone."
      },
      {
        "where": "PEEK thermoplastic laminate",
        "line": "Teijin publishes a PEEK laminate built from HTA40 fabric. Its data sheet gives a laminate tensile strength of 963 MPa at 0 degrees, but names no end use."
      }
    ],
    "can_do": [
      {
        "label": "Tensile strength",
        "line": "Carry tensile loads along the fibre at a typical strength of 4100 MPa (Teijin overview, bare filament).",
        "scope": "material"
      },
      {
        "label": "Tensile modulus",
        "line": "Give a typical tensile modulus of 240 GPa along the fibre, with 230 GPa on a second test method (Teijin overview).",
        "scope": "material"
      },
      {
        "label": "Low mass",
        "line": "The typical density is 1.77 g/cm3 (Teijin overview).",
        "scope": "material"
      },
      {
        "label": "Laminate strength",
        "line": "Make a PEEK laminate with a typical tensile strength of 963 MPa at 0 degrees (Teijin laminate sheet; composite value, not fibre).",
        "scope": "material"
      }
    ],
    "compare": "Among the Teijin fibre data read for this profile, Tenax HTA40 is the standard-modulus grade with a typical tensile strength of 4100 MPa, a tensile modulus of 240 GPa and a density of 1.77 g/cm3 (Teijin overview). Its elongation at break is 1.7 %. The PEEK laminate built from the same fibre reaches 963 MPa in tension and 1166 MPa in flexure at 0 degrees, but those are composite values and cannot be compared with bare-fibre strength. No comparison with other Tenax grades is made, because their values were not part of the sources read for this profile.",
    "compare_rows": [
      {
        "label": "Strength along the fibre",
        "benchmark": "ultimate_tensile_strength",
        "scope": "material"
      },
      {
        "label": "Stiffness along the fibre",
        "benchmark": "elastic_modulus",
        "scope": "material"
      },
      {
        "label": "Density",
        "benchmark": "density",
        "scope": "material"
      }
    ],
    "handling": [
      "Avoid creating or accumulating dust, and use eye protection where dust forms (Rave sheet, a generic thread product).",
      "Keep the fibre away from strong oxidisers and peroxides (Rave sheet).",
      "Check the safety data sheet for the Tenax grade you handle; none was found for HTA40 in the sources read."
    ],
    "good_for": [
      "Stiff, strong load paths along the fibre, where the 1.77 g/cm3 density matters (Teijin typical values).",
      "Thermoplastic composite laminates with a PEEK matrix, which Teijin sells with HTA40 fabric (Teijin laminate sheet)."
    ],
    "watch_out": [
      "All Teijin fibre values are typical values, which Teijin says are not guaranteed.",
      "No HTA40 ageing, oxidation or outgassing data in the sources read.",
      "The only safety data sheet read is for a different carbon thread product."
    ],
    "verdict": "Tenax HTA40 is a standard-modulus carbon fibre with typical values of 4100 MPa tensile strength and 240 GPa modulus at 1.77 g/cm3, according to Teijin. Its behaviour in space is not documented in the sources read, and its hazard data come from a different product.",
    "recipe": {
      "line": "Carbon fibre is a filament composed mostly of carbon atoms (Wikipedia). The sources read do not state the precursor or the process used for Tenax HTA40; Wikipedia lists polyacrylonitrile, rayon and pitch as the general precursors.",
      "parts": [
        {
          "name": "Carbon",
          "role": "Forms the graphitic filament. The stiffness and strength along the fibre come from the carbon structure, and the fibre diameter is set by the product grade."
        }
      ]
    },
    "risk_groups": [
      {
        "title": "For people",
        "lead": "The only safety data sheet read is for a high-purity carbon thread from another supplier, not for Tenax HTA40. It says the product does not meet the criteria for classification, but it warns about dust.",
        "points": [
          {
            "label": "Dust",
            "line": "The sheet says inhalation of dust may irritate the respiratory system and dust can cause eye irritation."
          },
          {
            "label": "Classification",
            "line": "The sheet says the substance does not meet the criteria for classification."
          }
        ],
        "level": 1,
        "verdict": "Dust can irritate; no classification in the SDS read"
      },
      {
        "title": "If it fails",
        "lead": "The failure mode read for this fibre family is a violent reaction with strong oxidisers and peroxides.",
        "points": [
          {
            "label": "Oxidisers",
            "line": "The sheet says violent reactions may occur with strong oxidisers and peroxides. It is a generic thread sheet, so it is a warning for the material class, not a measured HTA40 result."
          }
        ]
      },
      {
        "title": "Handling and storage",
        "points": [
          {
            "label": "Dust",
            "line": "Avoid creating or accumulating dust. Dust control and eye protection are listed in the sheet's control procedures."
          },
          {
            "label": "Oxidisers",
            "line": "Keep the fibre away from strong oxidisers and peroxides."
          }
        ]
      }
    ]
  },
  "updated": "2026-11-01",
  "review": {
    "status": "draft",
    "method": "assistant",
    "checked_values": 14,
    "unreachable": 2,
    "caveats": 4,
    "note": "Written by an AI assistant on 2026-11-01 from Teijin pages and PDFs read in this run. Unreachable: the Matweb HTA40 page (HTTP 403) and the PubChem acrylonitrile record (automated-access check). Caveats: all Teijin fibre values are typical values from the overview; the 230 GPa modulus is a second test method; the laminate rows are composite values, not fibre values; the hazard data come from a different carbon thread product."
  },
  "sources": {
    "teijin-overview": {
      "title": "Product overview: Tenax and Tenax Next filament yarn (Teijin Carbon, PDS dated 2026-04-15)",
      "id": "Teijin Carbon, PDS 2026-04-15, page 1 of 2",
      "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/EU_Filament_overview.pdf",
      "year": 2026,
      "kind": "datasheet",
      "license": "manufacturer datasheet, values quoted for reference"
    },
    "teijin-tsg01": {
      "title": "Produktdatenblatt TSG01de: Tenax filament yarn, EU filament (Teijin Carbon Europe)",
      "id": "Teijin Carbon Europe, product data sheet TSG01de, dated 2025-02-15",
      "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/Filament_Yarn/Product_Data_Sheet_TSG01de__EU_Filament__de____DE_.pdf",
      "year": 2025,
      "kind": "datasheet",
      "license": "manufacturer datasheet, values quoted for reference"
    },
    "teijin-tpwf-laminate": {
      "title": "Product data sheet: Tenax-E TPWF PEEK-4-42-HTA40 E13 3K DT-5HS-285 (Teijin Carbon)",
      "id": "Teijin, product key 6200, version 1.2, dated 2022-03-01",
      "url": "https://www.teijincarbon.com/fileadmin/user_upload/Datenbl%C3%A4tter/ThermoPlastics/TPWF/PEEK/Product_Data_Sheet_TSPTP201__6200_Tenax%E2%84%A2-E_TPWF_PEEK-4-42-HTA40_E13_3K_DT-5HS-285_.pdf",
      "year": 2022,
      "kind": "datasheet",
      "license": "manufacturer datasheet, values quoted for reference"
    },
    "teijin-filament-page": {
      "title": "Filament yarn page (Teijin Carbon): typical applications, product tables and processing methods",
      "id": "Teijin Carbon web page, read in this run",
      "url": "https://www.teijincarbon.com/products/filament-yarn/",
      "year": 2026,
      "kind": "web",
      "license": "manufacturer web page, quoted for reference"
    },
    "teijin-downloads": {
      "title": "Downloads (Teijin Carbon): product data sheets, handling recommendation and certificates",
      "id": "Teijin Carbon web page, read in this run",
      "url": "https://www.teijincarbon.com/downloads/",
      "year": 2026,
      "kind": "web",
      "license": "manufacturer web page, quoted for reference"
    },
    "teijin-consolidated": {
      "title": "Consolidated laminates (Teijin Carbon): thermoplastic products with HTA40",
      "id": "Teijin Carbon web page, read in this run",
      "url": "https://www.teijincarbon.com/products/thermoplastics/consolidated-laminates/",
      "year": 2026,
      "kind": "web",
      "license": "manufacturer web page, quoted for reference"
    },
    "rave-cf-sds": {
      "title": "Safety data sheet: High purity carbon fibers in carbon fiber threads, SDS00170CC1016 v4.0 (Rave Scientific)",
      "id": "Rave Scientific, Regulation (EC) No 1907/2006 Art. 31, dated October 5th 2022; CAS 7782-42-5",
      "url": "https://ravescientific.com/images/pdf/SDS00170CC1016-01_Carbon_Fibre.pdf",
      "year": 2022,
      "kind": "datasheet",
      "license": "supplier safety data sheet, quoted for reference"
    },
    "wiki-carbon-fibre": {
      "title": "Carbon fibers (Wikipedia article): definition and precursors only",
      "id": "Wikipedia, article Carbon fibers",
      "url": "https://en.wikipedia.org/wiki/Carbon_fibers",
      "year": 2026,
      "kind": "web",
      "license": "CC BY-SA 4.0"
    }
  },
  "license": "CC-BY-4.0",
  "url": "https://spacemushroom.com/profiles/tenax-hta/"
}