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| Keywords: PlasticsResearch 002.jpg One of the tests made on plastics at the National Bureau of Standards is the determination of resistance to weathering The transparent plastic specimens shown are being submitted to a 240-hour accelerated weathering test approximately equal to one year of outdoor exposure in Washington DC During this test specimens are alternately exposed to radiation from a sunlamp 200 hours and to water in the form of a mist 20 two-hour periods The effects of weathering on transparent materials are determined by measuring the changes in light transmission and the increase in haze In many cases materials with known resistance to weathering are tested at the same time as new materials for control purposes This method of test is used to evaluate plastic materials for actual use new plastics experimental materials and the effects of compounding ingredients National Institute of Standards and Technology National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Plastics Rubber industry Dentistry | ||||
