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Nov. 11, 1968 - Tiny crazes (structural defects in glassy polymers) grow into visible streaks as a stressed sample of plastic is immersed in alcohol in a test by Dr. Roger P. Kambour, a physical chemist at the General Electric Research and Development Center. Dr. Kambour, who has studied the highly complex phenomenon of crazes, has discovered a fundamental relationship between the strength of plastics and a variety of liquids that cause them to crack and break. Like true cracks, crazes reflect light but are really minute regions interlaced with millions of submicroscopic holes. Because of this sponge like nature, crazes become weak points at which cracks and fractures may be generated. Properties of certain liquids increase the tendency of plastics to craze and eventually fracture

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Cause Certain Crack Cracks Craze Crazes Discovered Eventually Fracture Fractures Fundamental Grow Highly Holes Immersed Increase Interlaced Liquids Millions Minute Phenomenon Plastics Points Properties Really Reflect Regions Sponge Streaks Stressed Studied Tendency Tiny Visible Weak

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