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New Momentive Specialty Chemicals Technology Enables Mass Production of Class A Composite Parts

19 March 2013

A broader range of composite products for automotive Class-A production is now available from Momentive Specialty Chemicals including a new generation of epoxy resin transfer moulding (RTM) system available in EPIKOTE binder 04695-1 and EPIKURE 05490A curing agent.

According to Momentive, the new products deliver a minimum level of cure shrinkage. This characteristic paired with optimised RTM and HP-RTM process conditions, allows the production of high surface quality composite components that meet the automotive Class-A surface quality standard, and helps to substantially reduce the cost of light-weight composites.

“This new resin system is specifically suitable for gap impregnation RTM processing. The excellent surface quality is the result of very low shrinkage during curing, combined with a higher glass transition temperature (Tg), which prevent damage during the de-moulding step,” says Dr. Tareq Hasson, R&D Manager Composites. “This system cures in less than 15 minutes at 90°C with gap RTM, and it can also be used with standard RTM processes. It expands our portfolio for Automotive Class-A composites, which now includes a higher Tg faster curing alternative to the widely used EPIKOTE Resin 04695-1 and EPIKURE Curing Agent 05357 system.”

In further news, Momentive has broken the two-minute barrier for mass production of composite parts with its new EPIKOTE Binder 05475 and EPIKURE 05500 fast-cure epoxy system developed for resin transfer moulding (RTM) and liquid compression moulding (LCM) processes enables mass production of automotive composite parts.

According to Momentive, the new system features the same proprietary thermolatency and very low viscosity as the EPIKOTE Binder 05475 and EPIKURE 05443 curing agent but with properties that ensure excellent fibre wetting and cavity filling, leading to outstanding handling and processing properties. In addition the new cure process is further accelerated without an extensive exothermic reaction.

“This is a great achievement. LCM is the fastest process for flat panels and a process cycle of less than 2 minutes can be achieved, while RTM is the recommended process for the more complex shapes,” said Dr. Roman Hillermeier, Technology Development Manager for the Company. “In addition, the system already meets the future health, safety and environmental requirements outlined by REACH 2015.”






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