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Spectrophotometry, Infrared radiation, Test specimens, Testing conditions, Ozone, Lubricants, Chemical-resistance tests, Gas-resistance tests, Compression set, Elongation at fracture, Tensile strength, Temperature, Ageing (materials), Hardness, Seals, Diaphragms (mechanical components), Synthetic rubber, Natural rubber, Mechanical components, Gas-powered devices, Grades (quality), 1st family gases, 2nd family gases, 3rd family gases, Mechanical tests, Verification, Quality control