GMW14727

Description / Abstract: GMW14727, 4th Edition, October 2019 - Rubber Sealings for Refrigerant Applications

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).

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.

Material Description

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

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).