We are one of the few manufacturers with the complex blowing agent technology required to produce silicone sponge articles. These extrudates have a closed cell sponge structure, resulting in excellent behaviour in a moist or liquid environment (moisture absorption <1.5 percentage in weight). Our right combination of compounding and process parameters, the cell structure can be varied within a broad range to produce silicone sponges with differing physical and chemical properties, for example softness, density, temperature resistance, chemical resistance.When sponge profiles are used as seals, as a rule it is silicone’s high compressibility and outstanding rebound resilience which are of crucial importance.
Given the fact that density and usually subjective features such as “the feel” are traditionally used to assess silicone sponges.This is supplemented by density and Shore hardness, which is not actually suitable in physical terms but still frequently used. In contrast to mechanically in-stable cold-vulcanised silicone materials, we only uses high tensile-strength, hot vulcanised silicone bases which produce a fine pored, stable, closed cell structure. Together with classical square, round cord and block profiles, hollow chamber profiles and complicated contours can also be produced from silicone sponge.The special blowing agent technology in pressure-less vulcanisation during extrusion is and remains a special feature which solves a large number of sealing problems, particularly at the high temperatures occurring in current daily practice.
The silicone sponge profiles offer outstanding thermal insulation together with noise insulation.Depending on the application, special additives can optimise the seals further with specific chemical resistances.Our toolmaking department and its extensive range of machinery, including various different punching techniques, allow for low-cost production of flat sponge seals.
FDA approval is given to products which meet certain criteria and are deemed 100% safe and non toxic product for food contact or pharmaceutical applications. Our FDA grade sponge cords are also platinum cured, which gives them significant benefits over similar products. Platinum cured silicone is non toxic, non yellowing and also features no peroxide by products.