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Member of the group of companies Member of the group of companies Rekon, Strojtex, Omnipack, PolyPLASTY, TMW, Carbon design a Flying machines
Semi-products and parts made of engineering plastics Polyplasty

Polyvinylidenfluoride

polydef
High-molecular, semi-crystalline thermoplastic with its own white colour.
It has similar properties as PTFE. Excellent chemical resistance, wide range of operating temperatures (– 50ºC / + 150ºC ) and  it is not susceptible to ageing because of weathering. Furthermore, it has excellent strength, toughness, creep and high-energy radiation resistance and it significantly outperforms all other fluorinated polymers. Conversely, it has a lower friction coefficient and worse insulating properties.
We process the materials using the following procedures:
 
Extrusion: Extruded profiles according to drawings and semi-products according to DIN
Machine parts: Turned and milled parts in single and serial production
Pressings: Injected moulded parts weighing up to 16.000 g
Density: ISO 1183 1.78 g/cm3
 Mechanical properties    
 Tensile strength at yield  ISO 527  59 MPa
 Tensile strength  ISO 527  40 MPa
 Elongation  ISO 527  20 %
 E-Modulus of tensile elasticity  ISO 527  2500 MPa
 Brinell Hardness  ISO 2039-1  95 MPa
 Brinell Hardness Number    H358/30
 Shore (A/D) or Rockwell (R/L/M) Hardness  ISO 868, ISO 2039-2  D78
 Charpy notched impact strength at 23 °C  ISO 179/1eA  7.6 KJ/m2
     
 Electrical properties    
 Permittivity at 50 Hz  IEC 60250  8.4
 Permittivity at 1 MHz  IEC 60250  6.4
 Dielectric loss factor at 50 Hz  IEC 60250  490 1E-4
 Dielectric loss factor at 1 MHz  IEC 60250  1700 1E-4
 Dielectric strength  IEC 60243-1  40 kV/mm
 Thickness for dielectric strength    1.0 mm
 Specific dielectric resistance  IEC 60093  1014 Ω·m
 Surface resistance  IEC 60093  1014 Ω
     
 Thermal properties    
 Thermal conductivity  DIN 52 612  0.19 W/Km
 Coefficient of transverse expansion, linear  ISO 11359 130  10-6/K
 Melt or vitrification temperature ISO 11357    175 °C
 Heat distortion resistance A  ISO 75 HDT/A (1.8 MPa)  115 °C
 Heat distortion resistance B  ISO 75 HDT/B (0.45 MPa)  148 °C
 Max. short-term temperature    160 °C
 Max. long-term temperature    150 °C
 Min. operating temperature    -30 °C
     
 Other properties    
 Water absorption under regular conditions  ISO 62  0.01 %
 Water absorption in humidity  ISO 62  0.04 %
 Burning behaviour according to UL 94  IEC 60695-11-10  V-0
 UL 94 Thickness    1.6 mm
     
 Special properties    
 Proportional elongation at yield  ISO 527  7 %
 Tensile creep modulus (0.5% 1000 hrs)  ISO 899-1  1750 MPa
 Flexural strength  ISO 178   78 MPa
 Fatigue in flexure  ASTM D671  35 MPa
 Charpy impact strength at 23 °C  ISO 179/1eU  89.4 KJ/m2
 Charpy impact strength at -30 °C  ISO 179/1eU  97.6 KJ/m2
 Charpy notched impact strength at -30 °C  ISO 179/1eA  2.3 KJ/m2
 Izod notched impact strength at 23 °C  ISO 180/4A  65 J/m
 Coefficient of slip creep compared to steel    0.20-0.35
 Specific heat capacity  IEC 1006  1.20 J/g K
 Vicat softening point A  ISO 306 VST/A/50 (10 N)  168 °C
 Vicat softening point B  ISO 306 VST/B/50 (50 N)  150 °C
 LOI Acid index  ISO 4589  44 %

Chemical properties

 Mineral lubricants:  resistant
 Aliphatic hydrocarbons:  resistant
 Aromatic hydrocarbons:  resistant
 Gasolines:  resistant
 Weak mineral acids:  resistant
 Weak mineral acids:  resistant
 Weak organic acids:  resistant
 Strong organic acids:  resistant
 Oxid. acids:  conditionally resistant
 Weak alkalis:  resistant
 Strong alkalis:  not resistant
 Trichlorethylene:  resistant
 Perchlorethylene:  resistant
 Acetone:  not resistant
 Alcohols:  resistant
 Hot water:  (hydrolysis) resistant
 Effects of atmospheric conditions:  resistant

Areas of use:

  • piping
  • mounting flanges
  • sealing
  • pump components
  • fittings
  • components for nuclear technology
  • cable sheathing
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