ELASTOSIL® LR 3070/40 US A/B
ELASTOSIL® LR 3070/40 US A/B is a primerless, self-bonding liquid silicone rubber (LSR) grade that bonds to various plastic substrates (e. g. PA, PBT).
ELASTOSIL® LR 3070 series are primerless self-bonding grades that adhere to various plastic substrates e.g. PA, PBT and metals, but not to the mold surface. The bonding is improved by oven-cure for 1 hour at 100C or 24 hours at room temperature. Because of individual surface properties, each substrate must be tested before production. For further information of compatible substrates, please contact your Wacker agent.
ELASTOSIL® LR 3070/40 US A/B can be processed using standard liquid rubber injection molding techniques for over molding or co-molding (2K processes) without special treatment of the mold surface.
Parts made from ELASTOSIL® LR 3070-series can be used for technical applications without post curing but do not comply with regulations for pharmaceutical or food contact.
ELASTOSIL® LR 3070/40 US A/B is a 2-part, 1:1 ratio system. Parts A and B are delivered in matching quantities in 20-kg and 200-kg pails and drums. With proper metering equipment, product can be pumped 1:1 (A:B) directly from the containers into a static mixer and the injection molding machine. The mixed pot life in the closed system is 2-3 days.
Note: New molds should be “seasoned” with ELASTOSIL® LR 3003 for 100 shots prior to production.
ELASTOSIL® LR 3070/40 US A/B has a shelf life of 6 months when stored below 32 °C (90 °F) in the tightly closed original container.
Storage beyond the recommended shelf-life does not necessarily mean that the product is no longer usable. However, the properties required for the intended use must be checked for quality assurance reasons.
Once opened, containers should always be resealed to prevent catalyst poisoning by amines, sulfur compounds, and other substances.