GMW14727

Description / Abstract: 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 Drawing/Part Number 9985751 or equivalent)

• R1234yf (GM Drawing/Part Number 9986319 or equivalent)

• Polyalkylene Glycol (PAG) compressor oil (GM Drawing/Part Number 9986181 or equivalent)

• Polyolester (POE) compressor oil (GM Drawing/Part Number US 88862657 or equivalent and Canada Drawing/Part Number 88862658 or equivalent)

Material Description. Materials covered by this standard are divided into three types;

Type A: EPDM, only for use with PAG oils, color code violet.

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

Type C: HNBR.

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 Family Owner (BFO).