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The material of our products

Development and customer specified production of tubes and profiles made of HCR Silicone-rubber

HCR Silicone rubber
HCR (Heat Cured Rubber) is a specialty synthetic elastomer which provides a unique balance of chemical and mechanical properties required by many of today's more demanding industrial applications. From it's original development in the 1940's using a laboratory process to it's final commercial form today, HCR Silicone rubber gives exceptional performance in many different application areas.

Composition / Description The materials consist primarily out of Polydimethylsiloxanes with reactive Vinyl groups and surface treated fumed silica.

For classic products the abbreviated designation VMQ is used. Building in Phenyl groups in the polymer chain leads to an extended low temperature range (PVMQ). By using Trifluorprophyl groups, the resistance against organic solvents, fuels and oils is improved (FVMQ).

Articles made from HCR Silicone Rubber show following interesting properties

  • High temperature resistance up to 200°C (stabilized up to 300°C)
  • Serviceability at temperatures from -60°C to 200°C
  • Low Temperature flexibility -60 °C (Special grades down to -100°C)
  • Good elongation characteristics
  • Excellent UV, Ozone and Corona resistance
  • Good electrical insulating properties
  • Conductive adjustable
  • Good resistance to many chemicals
  • Highly Translucent (easy to pigment)
  • Physiological indifference
  • Neutral smell and taste
  • Low levels of smoke, no toxic by-products under fire conditions
  • Easy to sterilize

Typical Properties

Shore A, Hardness approx. 12 - 90
Tensile Strength approx. 5 - 11 MPa
Elongation approx. 200 - 1000 %
Tear Resistance (ASTM D 624 A) approx. 12 - 40 kN/m
Specific Gravity approx. 1,11 - 1,50 g/cm3
Volume resistivity approx. 2 x 1015 Ohm x cm
Dielectric strength approx. 20 kV/mm
(2 mm sheets)
Coefficient of linear thermal expansion approx. 2-4 x 10-4
Thermal conductivity approx. 0,2 - 0,3 W x m-1 x K-1