GMNA-9985885-1993.pdf
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1、- 9006377 0004717 22T W GENERAL MOTORS ENGINEERING STANDARDS Materials and Processes - Fuels 81 Lubricants LUBRICATING GREASE 9985885 1 SCOPE. This specification covers a lithium soap grease suitable for use in lubricating automotive wiper trans- mission assemblies and similar applications requiring
2、 excellent wear characteristics, moisture resistance, and shall have an operating temperature range of -23 to 93 C. 1.1 The grease shall be a homogeneous mixture consisting of a high quality petroleum base oil and a lithium soap thickener in combination with adequate oxidation and corrosion inhibi-
3、tors. The grease shall also contain a zinc additive, for extreme pressure protection. The material shall be so compounded that it will meet all the functional requirements of this specifica- tion. 2 REFERENCED STANDARDS. ASTM D88 ASTM D128 ASTM D566 ASTM D92 ASTM D130 ASTM D942 ASTM D97 ASTM D217 AS
4、TM D2270 3 REQUIREMENTS. Specific ma&al requirements and appropriate test methods are listed under properties. 3.1 PHYSICAL PROPERTIES OF THE AS-RECEIVED MATERIAL. See Table 1. 3.2 PHYSICAL PROPERTIES OF THE ORIGINALLY APPROVED MATERIAL. See Table 2. 3.3 There shall be no separation of soap and oil
5、when 25 g of the grease is heated 149X for 2 h. 3.4 The grease shall not disintegrate in boiling water when 25 g is placed in a 250 mL beaker and boiled for one minute. 3.5 CORROSION (ASTM D130). A clean copper strip shall be immersed in a test tube of the grease at 1WC for 24 h. There shall be no p
6、itting, etching, or heavy brown or black stain remainin g on the copper after washing with benzine. A slight brown stain shall not be cause for rejection. 3.6 STORAGE STAF3ILJTY. l%e grease shall not thicken or separate while in storage and shall not show oxidation up to six months storage. A slight
7、 amount of oil that may appear on the surface or in depressions shall not be cause for rejection. 3.7 Oxidation stability pressure drop in oxygen bomb after 100 h 99 f l C, using ASTM D942 will be 70 kPA max. 3.8 PHYSICAL PROPERTIES OF THE MINERAL OIL. See Table 3. 4 QUALITY 4.1 The grease shall be
8、free from Imps, crtystalline growth, dirt, or other foreign material and shall be consistent in appear- ance in regards to color, quantity of tie oil, and translucency. It shall be unifoxm in quality. 5 INITIAL SOURCE APPROVAL. No shipment shall be made by auy supplier until representative initial p
9、roduction samples have been approved by engineering as meeting the requirements of this s-cation. 5.1 Completed copies of the GM Material Safety Data Sheet and Critical Material Register (available from the materials engineering department or laboraory) must be submitted with any new submissions or
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