PFA Specific Gravity (Density)
PFA (Perfluoroalkoxy, Soluble Polytetrafluoroethylene) is a melt-processable high-performance fluoropolymer with perfluoropropyl ether side groups in its molecular chain. It retains PTFE's core properties of chemical resistance, temperature resistance, and low friction, while offering excellent thermoplastic processability. Its density falls within a stable range among fluoroplastics, making it a core material for high-end anti-corrosion, semiconductor, and medical applications. The density of PFA is primarily influenced by polymerization process, molecular weight, and minor filler modifications, with significant differences between virgin and modified grades. Accurate density parameters are critical for precision injection molding, extrusion, and component dimension design.
Virgin PFA: 2.12–2.17 g/cm³, typical value 2.15 g/cm³. Its all-fluorine structure provides exceptional chemical resistance, non-stick properties, and electrical insulation with stable density, suitable for high-end basic scenarios such as semiconductor tubing, chemical anti-corrosion pipes, and medical consumables.
Glass Fiber Filled PFA: 2.15–2.30 g/cm³. Density increases with glass fiber content, primarily enhancing wear resistance, dimensional stability, and creep resistance while reducing the coefficient of thermal expansion. Ideal for medium-to-high load mechanical seals and bearing components.
Carbon Fiber Filled PFA: 2.10–2.25 g/cm³. Density rises slightly with filler content, primarily strengthening self-lubrication, thermal conductivity, and fatigue resistance. Suitable for precision transmission components requiring high-speed, oil-free lubrication and semiconductor carrier jigs.
Conductive/Antistatic PFA: 2.13–2.22 g/cm³. Modified with conductive fillers like carbon black and metal oxides, its density is slightly higher than virgin PFA, providing antistatic and conductive properties for electronic manufacturing and cleanroom transfer components.
Wear-Resistant Modified PFA: 2.14–2.23 g/cm³. Composite fillers such as graphite and molybdenum disulfide slightly increase density, optimizing friction coefficient and wear life for high-frequency reciprocating seals and valve seats.
Density parameters are the core basis for designing semiconductor fluid delivery systems, chemical anti-corrosion equipment, medical implant aids, and high-end electrical insulation components. Its melt-processable nature, combined with a stable density range, ensures precise dimensional fit under high-temperature, strong-corrosion, and high-cleanliness conditions. Density calculations directly influence mold runner design, molding shrinkage control, and product weight management, while supporting its core properties of chemical resistance, low friction, and high temperature resistance.
