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Metal Test Specimen, Cadmium, ea (ASTM D4636, FTM791/5308)Metal Test Specimen, Cadmium, ea (ASTM D4636, FTM791/5308) Note: Specify D4636 metal specimens desired as washer or square shaped Type "W" for washer and "S" for square ACCESSORIES OXIDATION AND CORROSIVENESS TESTING OF OILS