(C2F4)n
Chemistry聚四氟乙烯 is specified as (C2F4)n. Density band ~2.2 g/cm³.
What holds 聚四氟乙烯 together is not the nickname. Formula (C2F4)n, density ~2.2 g/cm³.
Meters are atlas-relative. Grades are the SKUs buyers write.
阶段
Microstructure
OrderProcessing sets grain, crystallinity or fibre orientation — the reason two lots of 聚四氟乙烯 can test differently.
Interfaces
SurfacesCoatings, oxide films, sizings or paper faces often decide weather and fire behaviour more than the bulk brochure.
Defects
FlawsInclusions, voids, knots, pinholes or residual stress start the failures that mill certificates do not list.
Grades
Variants聚四氟乙烯 is a family. Grade names below are the ones buyers actually write on RFQs.
Ageing
TimeMoisture, UV, creep, hydrogen or carbonation shift properties in service. Design to the aged state.
相对标尺
Strength22
Strength is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Heat envelope74
Heat envelope is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Fire behaviour58
Fire behaviour is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Insulation32
Insulation is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Workability35
Workability is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Circularity24
Circularity is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
牌号
Virgin granular
Ram extrusion.Ram extrusion.
Fine powder
Paste extrusion.Paste extrusion.
e聚四氟乙烯
Expanded membranes.Expanded membranes.
Filled 聚四氟乙烯
Glass, carbon, bronze.Glass, carbon, bronze.
PFA / FEP cousins
Melt-processable fluoropolymers.Melt-processable fluoropolymers.
键合
Primary bonding
聚四氟乙烯 holds together by covalent chain chemistry.
Secondary forces
Hydrogen bonds, van der Waals stacks or grain-boundary cohesion set toughness and moisture uptake.
Composites & fills
Fillers, fibres, plasticisers or aggregates are part of the real product, not impurities.
Environment film
Oxides, chars, sizings or paints are the layer the world actually meets.
Change the grade, the coating or the moisture and you have a different material with the same English name.