THESE O-RINGS AND SPECIALTY SEALS ARE INTENDED FOR SEALING PHOSPHATE ESTER FLUIDS USED IN HYDRAULIC SYSTEMS.

THIS SPECIFICATION ESTABLISHES REQUIREMENTS FOR ELASTOMER SEAL ELEMENTS FOR USE IN HYDRAULIC SYSTEMS USING PHOSPHATE ESTER FLUIDS.

CLASSIFICATIONS THE ELASTOMERIC COMPOUND, ETHYLENE PROPYLENE COPOLYMER OR TERPOLYMER RUBBER DESCRIBED IN THIS SPECIFICATION COVERS TWO (2) TYPES OF O-RING PACKINGS; STANDARD SIZE O-RINGS PER NAS1611/NAS1612, AND ALL OTHER ELASTOMER SEAL ELEMENTS USED IN SPECIALITY SEALS.

THE ELASTOMERIC COMPOUND SHALL BE CLASSIFIED AS A CLASS 1 COMPOUND IF IT PASSES ALL SPECIFICATION REQUIREMENTS INCLUDING SOAK TESTING IN ALL COMMERCIALLY AVAILABLE PHOSPHATE ESTER HYDRAULIC FLUIDS THAT MEET AS1241, TYPE IV, CLASS 1, AND CLASS 2, GRADE A REQUIREMENTS AS DESCRIBED IN 3.2.

THE ELASTOMERIC COMPOUND SHALL BE CLASSIFIED AS A CLASS 2 COMPOUND IF IT PASSES ALL SPECIFICATION REQUIREMENTS INCLUDING SOAK TESTING IN THE COMMERCIALLY AVAILABLE PHOSPHATE ESTER HYDRAULIC FLUID THAT MEETS AS1241, TYPE IV, CLASS 2, GRADE A REQUIREMENTS AS DESCRIBED IN 3.2.