Freudenberg Silicone (VMQ) Compounds

Freudenberg Silicone (VMQ) Material Description:

VMQ silicone rubbers are highly polymeric vinyl-methylpolysiloxanes. Silicone is quite widespread as a material in butterfly valve seals. Due to its low volumetric expansion under the influence of media and its high elasticity, the butterfly valve switches reliably until the end of its service life.

Another argument for VMQ in contact with food and pharmaceuticals is its purity, clearly visible in the transparency of the material, even if the mechanical strength and chemical resistance are not optimal, especially during intense cleaning operations.

Freudenberg Seal Distributor

Engineered Seal Products is proud to be a "Freudenberg North American Preferred Partnered":

  • Involvement of engineering services and technical material know-how from Freudenberg Sealing Technologies
  • Highest technical seal competence through qualified training and certified sealing know-how
  • Efficient and speedy cross-linked processes with Freudenberg Sealing Technologies
  • High and quick availability assuring a reliable delivery performance
Freudenberg (VMQ) General Properties:
  • Excellent thermal and heat resistance
  • Best low-temperature flexibility
  • Little temperature dependency of the technological properties
  • Excellent weathering, aging and ozone resistance
  • High gas permeability
  • Very good physiological properties
  • Very good dielectric properties
  • Good resistance to synthetic, animal and vegetable oils, glycols, fire-resistant hydraulic fluids and various solvents
  • Not resistant in low-molecular esters and ethers, aliphatic and aromatic hydrocarbons
  • Temperature-resistant from –60 °C to +200 °C (–76 °F to +392 °F)0 °C (–22 °F to +302 °F)

Freudenberg Silicone (VMQ) Compounds:

Compound Number Datasheet Hardness (Shore A) Low Temp High Temp Color
78 VMQ 166898 PDF 78 +- 5 -- -- Light Blue
75 VMQ 176643 76 +- 5 -- -- Red
70 VMQ 117055 PDF 70 +- 5 -- -- Transparent

ASTM Designation
Shelf Life
25 Years
Hardness (Shore A) Range
40 - 80

Temperature ranges will apply to the majority of media for which the material is potentially recommended. With some media however, the service temperature range may be significantly different. ALWAYS TEST UNDER ACUTAL SERVICE CONDITIONS.

ESP’s shelf life recommendation is based on the ARP 5316 standard and intended to be utilized by those organizations who do not already have specific recommendations for the control of elastomeric seals. It should be noted that the packaging of the elastomeric seals prior to assembly into a product is an integral part of the controlled storage procedure. It provides a positive means of product identity from the time of manufacture, to the time of assembly.