Outgassing

Illustrated explanation

Distinguish release, extraction, cure and porous structure

1Outgassing
Distinguish release, extraction, cure and porous structureCallout 1: Outgassing. Callout 2: Extractables. Callout 3: Post-cure. Callout 4: PTFE / expanded PTFE. Volatile release, fluid extraction, additional cure treatment and expanded pore structure address different aspects of a material. Each requires its specified conditions. Current term: Outgassing, callout 1. 1Outgassing 2Extractables 3Specified further treatmentPost-cure 4DensePorous examplePTFE / expanded PTFE
  1. OutgassingThis term

    Volatile material is released under the stated conditions. Check temperature, vacuum and contamination limits for the actual application.

  2. Extractables

    Components are removed by the defined extraction medium and procedure. The result differs from normal-service leaching or general chemical resistance.

  3. Post-cure

    An additional controlled treatment develops the required material condition. Its need and schedule depend on the actual compound and process.

  4. PTFE / ePTFE

    Expanded PTFE has a distinct porous structure. Dense PTFE and ePTFE need separate checks for sealing, flow and contamination duty.

Volatile release, fluid extraction, additional cure treatment and expanded pore structure address different aspects of a material. Each requires its specified conditions.

Conceptual material and process sketches without composition, rate or cure schedules. Selection remains grade- and application-specific.

ReferencesISO 20484:2017 — Leak testing — VocabularyASTM E595 — Total mass loss and collected volatile condensable materials in vacuumISO 10993-18:2020 — Chemical characterization of medical-device materialsISO 472:2013 — Plastics — VocabularyISO 1629:2025 — Rubber and latices — NomenclatureISO 1043-1:2011 — Plastics — Basic polymer symbols and abbreviated termsISO 15106-1:2003 — Plastics — Water vapour transmission rate