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Chapter One APPLICATIONS its polyurea systems. Mobay claims that its unreinforced STR-400 structural RIM (SRIM) system, which can be used for automotive applications such as bumper beams, trunk modules, truck boxes, spare-tire covers and roof caps, offers 50% greater notched Izod strength than its earlier grade of SRIM. [1-46] Dow Chemical announced at the show its completion of the design and engineering of ultra high speed equipment to run the fast new RIM materials. Proof of SRIM’s practicality was seen on a bumper beam on the 1989 Corvette on display at the Dow exhibit. It is molded by Ardyne Inc., Grand Haven, MI, using Dow’s Spectrim MM 310 system. The SRIM beam combines a directional and random glass preform with a matrix of thermosetting polycarbamate resin and saves 18% in weight and 14% in labor and material costs, according to Chevrolet. Hercules announced two new SRIM systems at the Exposition. One, Grade 5000 is a SRIM system designed for glass reinforcement and intended for such uses as hoods, trunk lids, door panels, side fairings and fenders. The other, Grade 1537, is said to offer a higher heat deflection temperature (185 F) and better impact, stiffness and strength properties and is intended primarily for bumper covers, side fairing extensions, roof panels and sun visors. It is claimed to maintain ductility from -30 to 150 F. [1-46] Materials The following is a list of some promising material systems that have been introduced for automotive applications: • Porsche uses Du Pont’s Bexoly V thermoplastic polyester elastomer for the injection molded front and rear fascias on its new Carrera 4 model. • Shell Chemical is introducing new styrenic-based Kraton elastomers, which are extremely soft with excellent compression set and moldability. Its applications in the transportation industry include window seals and weather gasketing, where softness, better than average heat resistance, and low compression set are important. • A foam that debuted at the Spring 1989 Exposition is a cold curing flexible PUR from Mobay, which is designed to reduce noise levels inside automobiles. BMW now uses the foam system, called Bayfit SA, on all its models. • General Electric Plastics has designed and developed a one-piece, structural thermoplastic, advanced instrument panel module, called AIM, for automobiles. The one-piece design sharply reduces production time. [1-46] • Glass reinforced thermoplastic polyesters such as PBT (polybutylene terephthalate) are used extensively in the automotive industry for exterior body parts such as grilles, wheel covers and components for doors, windows and mirrors. PBT is also in demand for underhood applications such as distributor caps, rotors and ignition parts. Other uses include headlamp 48PDF Image | Marine Componsites
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