Buildings
Structure, lining, insulation or finish depending on family.
ポリエチレン earns its keep in systems: a beam, a batt, a fibre blend, a coated steel — rarely a lone coupon.
Products below are cultural landmarks as much as SKUs.
産業
Transport
Mass, fire and fatigue rewrite the grade list.
Energy
Heat, voltage and hydrogen compatibility.
Consumer
The volume that pays for the mill.
Medical / food
When allowed — extractables and allergies matter.
Defence / safety
Ballistics, FR clothing, fire stops.
製品
ICI Alketh
1939
HDPE bottle
1960s–
Dyneema
1979–
PE100 pipe
1990s–
Tupper box lore
1940s–
Geomembrane
1980s–
UHMW hip liner
1960s–
Stretch film
1970s–
組み合わせ
ptfe
The fluoropolymer that laughs at PE’s melting point.
polyester
PET bottles vs PE bottles — different recycle streams.
aramid
Ballistic fibre rival to UHMWPE.
polyurethane-foam
Another polymer insulation path.
If the pairing is wrong, the material will be blamed for a system fault.