01 Feedstock
Ore, monomer, fibre, mineral or scrap that can legally become PTFE.
Making PTFE is a chain: feedstock, conversion (DuPont 1938 Plunkett), forming, heat, finish, install.
Skip a step and the properties chapter is describing a different object.
工程
02 Conversion
DuPont 1938 Plunkett
03 Forming
Cast, spin, weave, sinter, foam, laminate or coat — the step that sets anisotropy.
04 Heat / cure
Temper, vulcanise, calcine or dry: skip it and the datasheet is fiction.
05 Finish
Coatings, sizings, facers, galvanizing, anodising, painting.
06 Install
Fasteners, adhesives, DFT, compression, dryness — site quality is a material property.
経路
Primary
Virgin route around United States.
Recycled / secondary
Recycling exists but quality or energy often disappoints.
Specialty
High-spec grades leave the commodity mill.
Site-applied
Coatings, sprays, casts — the factory is sometimes a jobsite.
図解
PTFE process path
Feedstock to installed product.
- Feed — in
- Convert — mill
- Form — shape
- Finish — coat
- Install — out
- Spec — code
- Scrap loop — rec
PTFE heat & fire
Energy in, class out.
- Heat — in
- PTFE — mat
- λ / char — out
- Ignition — fire
- Euroclass — class
- Assembly — sys
限界
Envelope
Melting/softening ~327 °C; conductivity ~0.25 W/m·K.
Environment
Moisture, UV, chlorides, alkalis or oxygen — pick the one that actually kills PTFE.
Code
Fire class high OI but pyrolysis fumes is a starting letter, not a wall rating.
Process energy and scrap quality belong in the carbon passport, not in a footnote.