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Keywords of this article:  injection molding 
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medical 
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injection mold 
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Wacker is presenting its new ELASTOSIL LR 5040 liquid silicone rubber. The product features excellent tear strength after curing, allowing manufacturers of medical devices to dispense with thermal post-treatment in many cases.
Wacker is presenting its new ELASTOSIL LR 5040 liquid silicone rubber. The product features excellent tear strength after curing, allowing manufacturers of medical devices to dispense with thermal post-treatment in many cases.

At Compamed 2017, Wacker Chemie will be showing its new ELASTOSIL LR 5040 line of liquid silicone rubber (LSR) grades that eliminates the thermal postcuring process.

ELASTOSIL LR 5040 cures to a translucent elastomer whose volatiles content – without thermal post-treatment – is below 0.5 weight percent. In its non-postcured state, the silicone exhibits a high level of tear resistance equivalent to that of postcured 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 postcured 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 cleanroom conditions.

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