Silicone cords are made of inorganic silicone rubber whose ability to retain its physical properties at elevated temperatures is superior to most other materials. The base material for the round silicone VMQ cords is also flexible at very low temperatures however its relatively poor tensile, tear strength and abrasion resistance limits use to static applications.
These weaknesses can be improved somewhat by reinforcement of the silicone cords with fine, high surface area fillers which are compatible chemically with the silicone polymer itself.
Silicone cord does possess extraordinary resistance to oxidation and ozone degradation due to the absence of unsaturated double bonds in the polymer backbone. Since it is fully saturated, only peroxides can be used for hot vulcanization processes.
Resistance of VMQ cord vulcanizates to gas permeation is generally considered to be poor, as much as 100 times greater than nitrile or butyl, but it is frequently specified in food and beverage applications as it does not impart any taste or odor. However, the automotive industry accounts for almost 50% of silicone usage.
The silicone cords can be manufactured in any size from 1.0mm DIA up to 50.0mm DIA. All of our silicone cords include suitable compounds together with tolerance accuracy and colour matching for high and low temperature requirements. The extruded products can be manufactured in hardness of a range between 20° to 90° shore A. Food grade and flame retardant materials are also available. Please feel free to request a free quotation.
-50°C up to +250°C.