RTP Company: The Global Leader in Specialty Compounding

End-Use Case Study —

Air Management Valve

• Helps Control Pollution

An intricately designed device molded from an RTP Company compound is part of an efficient system of pollution control in GM automobiles. In a warm car, fuel vapor collects in a vapor canister. An air management solenoid valve, manufactured by Delco Remy of Anderson, Indiana is attached to the canister. At a given cruising speed, the purge valve in the device opens and the vapors are routed into the fuel injection or carburation system for burning.

The part must withstand vapor gases of all types of automotive fuels on the market. It must also withstand temperature variances from 135 degrees C to -40 degrees C. Because of its under-the-hood use, heat stabilization is needed. In secondary operations the spool of the solenoid is wire wrapped and over-molded. Part strength and stiffness are required to prevent the spool from collapsing and obstructing the movement of a magnetic switch in the solenoid valve during the wrapping operation. The part must be molded in color and black for identification coding.

A custom formulated reinforced nylon 6/6 compound from RTP Company meets these requirements consistently from lot-to-lot. The compound has a HDT at 264 psi of 260 degrees C. Glass fiber reinforcement provides the necessary tensile strength and stiffness. The part is molded in green and black. Combined with a heat stabilizer, and nylon 6/6's inherent chemical resistance, this formulation provides an exacting match to Delco Remy's requirements. The molder is UFE Inc., Stillwater, Minnesota.

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