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Applications: chemical process tank construction and linings, pump impellers or
moving parts of equipment that are operating in chemically aggressive
environments, Cryogenic applications, super-cold refrigeration components,
Valves linings, seats, seals, Electrical & electronic components, insulators, cable
clamps, encapsulated parts, sockets, Medical centrifuge tubes, Blood analyzer
valves, oxygen respirator components, Gaskets pressure diaphragm, liquid gauge
seals, fluid handling, Films for food packaging, pharmaceutical packaging, optical
recording, electroluminescent display panels.
41) Polyvinylidene Fluoride (PVDF):
Specialty plastic material in the fluoropolymer family. It is used in applications
requiring the highest purity, strength, and resistance to solvents, acids, bases and
heat and low smoke generation during a fire event. Very easy to process compared
to other fluoropolymers, having low melting point of around 177°C. In thin sections,
such as films, filament, and tubing, PVDF components are flexible and transparent.
Density 1.6 - 1.75 g/ cm 3
Glass transition temperature -15 °C
Max continuous Service temperature 120 - 150 °C
PVDF degrades only above 380 °C.
Injection Moulding processed at temperature 190-280°C with recommended mould
temperature of 50 – 95 °C. Pre drying of resin is usually not necessary.
Mould design is very important consideration due to relatively high melt viscosity of
PVDF. The high shrinkage is 3-4 % is to consideration.
Extrusion temperature: from 230 to 290°C. No extrusion aids, lubricants, or heat
stabilizers are needed to extrude PVDF. L/D ratio of at least 20 is recommended.
Strengths: High purity, good heat resistance, resistance to most chemicals &
solvents, excellent resistance to abrasion and weathering, high strength & stiffness
with smooth surface, excellent resistance to UV and nuclear radiation, Piezoelectric
properties, high wear and abrasion resistance, Good sterilization resistance,
Intrinsic Flame retardant and low moisture absorption, Low coefficient of friction and
welded with very good weld line strength. It also has outstanding aging resistance,
with its properties remaining constant after many years of continuous use.
Limitations: High cost, Incompatibility with glass fiber, Attacked by ketones and
strong bases, Fair dimensional stability
Applications: Pipes and parts for tubing systems, valves, pump components,
vessels and tanks for chemicals industry, as base resins for long-lasting exterior
coatings, components for lithium-ion batteries, Optical Fiber Raceways, pressure
applications, solar glazing, Fuel transport systems, Electrical under-hood Cables,
Used in semiconductor, aerospace and paper industry, Nuclear waste processing,
Crude oil transport pipes and flow meters and sensors, components for processing
in pharma, food and medical industry, Clean room equipment.
42) Polysulfone (PSU):
Polyarylsulphones family member (PSU, PPSU and PESU): sulfur-containing
thermoplastics closely related to polyethersulfone (PESU). The structure of PSU is
aromatic groups, generally with more than one benzene ring, joined by a sulfone
group.

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