01 Feedstock
Ore, monomer, fibre, mineral or scrap that can legally become Polyéthylène.
Making Polyéthylène is a chain: feedstock, conversion (ICI 1933 / Ziegler–Natta 1950s), forming, heat, finish, install.
Skip a step and the properties chapter is describing a different object.
Étapes de procédé
02 Conversion
ICI 1933 / Ziegler–Natta 1950s
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.
Routes
Primary
Virgin route around United Kingdom / Germany.
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.
Schémas
Polyéthylène process path
Feedstock to installed product.
- Feed — in
- Convert — mill
- Form — shape
- Finish — coat
- Install — out
- Spec — code
- Scrap loop — rec
Polyéthylène heat & fire
Energy in, class out.
- Heat — in
- Polyéthylène — mat
- λ / char — out
- Ignition — fire
- Euroclass — class
- Assembly — sys
Limites dures
Envelope
Melting/softening LDPE ~110 °C; HDPE ~130 °C; conductivity ~0.4 W/m·K.
Environment
Moisture, UV, chlorides, alkalis or oxygen — pick the one that actually kills Polyéthylène.
Code
Fire class combustible olefin is a starting letter, not a wall rating.
Process energy and scrap quality belong in the carbon passport, not in a footnote.