POLYVINYLIDENE FLUORIDE (PVDF) Home > Products & Services > Polyvinylidene Fluoride (PVDF)

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KYNAR Polyvinylidene Fluoride (PVDF), the homopolymer of 1, 1-difluoroethylene, is a tough engineering thermoplastic that offers a unique balance of performance properties. The unique structure of alternating units of methylene and difluoromethylene, create a polymer with high crystallinity combined with a high polarity, resulting in a sharp melting point. It has the characteristic stability of fluoropolymers while retaining the properties of a conventional thermoplastic material. KYNAR FLEX ® resins are a series of PVDF based copolymers, similar to KYNAR ® homopolymer resins in purity and chemical resistance, but having additional chemical compatibility in high pH solutions, increased impact strength at ambient and low temperatures, and increased clarity.

 

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Kynar ®
740
Kynar ®
720
Kynar ®
2850
Specific gravity (ρ) ISO 1183 g/cm3 1.78 1.78 1.78
Max. permissible service temp   °C -30 to 140 -30 to 140 -30 to 140
Tensile strength at yield (σS) ISO 527 Mpa 50 52 35
Elongation at break (εR) ISO 527 % ≥ 50 ≥ 50 ≥ 50
Flexural strength (σB 3,5%) ISO 178 Mpa 80 80 80
Modulus of elasticity (Et) ISO 527 Mpa 2000 2200 1000
Coef. of linear therm. expansion (α) DIN 53752 K-1 x 10-4 1.2 1.2 1.5
Volume resistivity (ρD) VDE 0303 Ω x cm ≥ 1013 ≥ 1013 ≥ 1013

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Features & advantages of PVDF:
Mechanical strength & toughness
High thermal stability
High dielectric strength
Readily melt processable
Exceptional outdoor weather resistance
Low permeability to most gases and liquids
Low flame and smoke characteristics
High abrasion resistance
Very low creep
High purity
Resistance to most chemicals and solvents
Resistance to nuclear radiation
Resistance to fungi
Very smooth surfaces can be obtained

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KYNAR® PVDF has outstanding barrier properties which allows a better protection of the environment. The construction of chemical process equipment makes use of a multitude of materials to cope with specific corrosion problems KYNAR® PVDF has the advantage of absolute suppression of corrosion, even under varying process conditions, when compared to stainless steel.

A comparision of various fluoropolymers is detailed below:
PVDF PTFE ETFE PCTFE ECTFE PFA FEP
Density 1.78 2.18 1.76 2.13 1.68 2.15 2.14
Stress at yield (Mpa) 48 14 28 40 31 19 15
Flexural Modulus (Mpa) 2,000 800 1,300 1,250 1,700 700 650
Dielectric constant 8 1.9 2.2 2.6 2.5 1.9 1.9
LOI (%) 44 90 30 90 60 90 90
Decomposition temperature (ºC) 340 400 360 320 320 400 300
Melting temperature 170 342 270 214 240 - 247 305 - 307 275 - 295
Data from "Modern Fluoropolymers", ed J. Scheirs, Wiley and Sons 1997, New York.

Process Industry
Sugar Industry
High purity applications
Paper & pulp Industry
Electronic, electrical & semi-conductors industry
Nuclear power industry
Pharmaceutical Industry
Automotive Industry
Solar power panels
DI water plants

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