SYMPOSIA PAPER Published: 01 January 1985

The Influence of Microstructural Variability upon the Scatter in Mechanical Properties of R25 Sheet Molding Compound


The large scatter in the static strengths of R25 sheet molding compounds was observed to be related to the variability in the complex microstructure of this material. This microstructure consists of a subsurface veil of individual glass fibers and an internal core of intact fiber glass bundles.

Author Information

Shirrell, CD
Polymers Department, General Motors Research Laboratories, General Motors Technical Center, Warren, MI
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Developed by Committee: D30
Pages: 3–22
DOI: 10.1520/STP34011S
ISBN-EB: 978-0-8031-4938-0
ISBN-13: 978-0-8031-0415-0