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WACKER Unveiled Non-Postcuring Liquid Silicone Rubber for Medical Tech. at Compamed

Published on 2017-11-17. Author : SpecialChem

LSR in Medical Applications
LSR in Medical Applications
At COMPAMED, the international tradeshow for the medical supplier industry, Munich-based chemical group WACKER showcased 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 postcuring step after fabrication in many cases. 

Key Properties

Due to their purity and good skin compatibility, silicones increasingly find use in medical-technology applications. At COMPAMED 2017, chemical group WACKER presented 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.

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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Source: WACKER
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