News and Press Releases
13 November 2017
WACKER Presents Non-Postcuring Liquid Silicone Rubber for Medical Applications

At COMPAMED, the international tradeshow for the medical supplier industry, Munich-based chemical group WACKER will be showcasing its new ELASTOSIL® LR 5040 line of liquid silicone rubber grades. These silicone products fulfill the stringent regulatory requirements

that apply to silicone articles in many medical-technology applications. Cured rubber products made of ELASTOSIL® LR 5040 feature excellent mechanical properties, even without thermal post-treatment, and contain very few volatile substances. This allows manufacturers to eliminate the post curing step after fabrication in many cases. COMPAMED takes place in Düsseldorf, Germany, from November 13 to 16, 2017. ELASTOSIL® LR 5040 cures to a translucent elastomer whose volatiles content – without thermal post-treatment – is below 0.5 weight percent. In its non-post cured state, the silicone exhibits a high

level of tear resistance equivalent to that of post cured high-tear strength standard materials. As a result, it can withstand such mechanical stresses as may occur in the usage of medical devices, for example.

These properties make ELASTOSIL® LR 5040 the material of choice when manufacturers want to dispense with thermal post treatment altogether. Typical applications include anti-colic valves, bottle tops or respirator masks.

The product line will initially cover a hardness range from 30 to 70 Shore A. In the cured state, the actual hardness of the non-postcured  silicone deviates from specification by only ±3 points. ELASTOSIL®       LR 5040 can be readily processed by injection molding. Since molded parts no longer have to be post cured in many cases, production processes can be greatly streamlined and automated to a high degree.

This facilitates very rapid, efficient and cost-effective large-scale production, even under clean room conditions.

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