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High Strength Epon Laminates

Report Number: WADC TR 52-5 Supplement 1
Author: Hopper, F. C.
Author: Elam, D. W.
Corporate Author: Shell Development Company
Laboratory: Materials Laboratory
Date of Publication: 1952-02
Pages: 29
Contract: AF 33(038)-19587
Project: None Given
PB Number: PB119613
AD Number: AD0004231
Original AD Number: 4231

A laminate made from 181-114 glass fabric and EPON 1001 resin cured with dicyandiamide had a flexural strength of 76,900 psi at room temperature and 76,200 psi at 160°F (after 1/2 hour at 160F). The compressive strength was 70,200 psi at room temperature.

With EPON laminates of this type, either boiling in water or aging at 95-100% relative humidity and 100F for one hour caused a greater loss in strength than soaking for 30 days.

Improved Volan finish was the best of four new fabric finishes used in laminating with EPON 1001 and was the only finish better than 114.

Remarkably high strengths at elevated temperatures were obtained with an experimental resin known as EPON X-12100. Laminates made with this resin had a flexural strength above 60,000 psi at 392F after 30 minutes at that temperature.

Liquid EPON resins 828 and 834 cured with dicyandiamide also produced laminates resistant to temperatures up to 300F. After 1/2 hour at that temperature flexural strengths up to 44,000 psi were obtained. Aging for 200 hours at 300F resulted in 52,900 psi flexural strength in one laminate. At higher temperatures, strengths fell off markedly.

Dimethyl cyanamide, a liquid curing agent, used with EPONS 828 and 834 produced laminates having up to 53,100 psi flexural strength at 392F. This curing agent is toxic.

Flexural strengths at 300F after 1/2 hour at 300F up to 54,400 psi were obtained also in laminates made with mixtures of Plyophen 5015 (a phenolic resin) and EPON 1001, cured with dicyandiamide.

Of four large laminate 1/8" x 38" x 96" made with EPON 1001 at 25 psi, one was of excellent quality and another was considered good. There should be no difficulty in making EPON laminates of any large area.

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