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Technical Paper

New Low MDI Polyurethane Foam System Replaces Heat Reactive Baffles in NVH Applications

Low density polyurethane foam, applied in general assembly, is being used as a replacement for rubber-based heat reactive baffles in automobile cavities to inhibit noise transmittance. Most chemically reactive urethane foam systems used in barrier applications are MDI-based (diphenylmethane diisocyanate). The use of classical MDI-based technology in assembly plants typically requires substantial levels of ventilation [1]. High capital and operating expenses associated with plant ventilation systems have hindered the growth of polyurethane technology. This paper describes benefits of using a low MDI polyurethane foam system in place of classical two-component MDI-based foam systems and conventional rubber-based heat reactive baffles. Severe industrial hygiene testing has indicated that ventilation requirements to use the low MDI foam system in assembly plants may be greatly reduced.
Technical Paper

Design, Application Development, and Launch of Polyurethane Foam Systems in Vehicle Structures

The use of two-component polyurethane foam materials to improve sealing, stiffness, and crash performance in vehicle structures has increased significantly in the past 10 years. The proven cost and performance advantages associated with polyurethane chemistry, along with recent development efforts by Dow Automotive to minimize industrial hygiene concerns traditionally associated with polyurethane use [1], have resulted in increased activities associated with design, application development, and launch of foam systems in the automotive industry. This paper describes the key considerations that must be addressed to successfully incorporate polyurethane foams into vehicle structures from design, application development, and launch perspectives.