This standard covers the materials and performance requirements of Ethylene Propylene Diene Monomer (EPDM) and Hydrogenated Nitrile Butadiene Rubber (HNBR) O-rings and slim line seal washers used for sealing in Air Conditioning (A/C) systems with liquid and gaseous refrigerant. Rubber material is for use with refrigerants R134a and or R1234yf in combination with the compressor oil used in respective application.

• R134a (GM specification GMW5038 or equivalent).

• R1234yf (GM specification GMW16283 or equivalent).

• Polyalkylene Glycol (PAG) compressor oil (GM specification GMW16638 or equivalent).

• Polyolester (POE) compressor oil (GM Drawing/Part Number 9986277 or equivalent).

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose/Material Description.

Materials covered by this standard are divided into three (3) types:

Type A: EPDM, color code violet.

Type B: Drawing defined (e.g., using ASTM D2000 or SAE J200 line callout).

Type C: HNBR.

Symbols.

Not applicable.

Applicability.

O-rings and slim line seal washers used in refrigerant systems.

Remarks.

PAG and POE compressor oil formulations are unique to each A/C compressor manufacturer. In order to evaluate the entire spectrum of compressor oil formulations and refrigerants (R134a and R1234yf) used in GM vehicles, the A/C sealing washer supplier shall perform the material compatibility tests with the compressor oil formulations and refrigerant type confirmed by the responsible Global Thermal Bill of Materials (BOM) Family Owner (BFO).