MIL-R-25988/1A, MILITARY SPECIFICATION SHEET: RUBBER, FLUOROSILICONE ELASTOMER, OIL- AND FUEL RESISTANT, O-RINGS, CLASS 1, GRADE 70 (10 JUL 1975)

MIL-R-25988/1A, MILITARY SPECIFICATION SHEET: RUBBER, FLUOROSILICONE ELASTOMER, OIL- AND FUEL RESISTANT, O-RINGS, CLASS 1, GRADE 70 (10 JUL 1975)., The purpose of this specification sheet is to set up a standardized part numbering system for 0-rings procured to MIL-R-25988, Class 1, Grade 70.