1977-02-01

The Development and Processing of a Thermoset Rubber Fascia Substrate 770842

Sheller-Globe has developed a paintable thermoset elastomeric substrate material designed for use in automotive fascia, sight shields, etc.
Based on an SBR/EPDM blend the material has a flexural modulus of 138 MPa (20,000). Incorporation of fiberglass and filler modifications readily permit adjustment of the flexural modulus.
A processing study of M-1078 containing 4% fiberglass established that the material is readily moldable by either compression or injection methods.
Optimum mold temperature ranges are 177° to 199°C (350-390°F) with stock injection temperatures running from 138° to as high as 150°C without scorch problems.
Correlation between Mooney viscosity and scorch data and ease of injection molding was noted.

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