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1、 ENGINEERING STANDARDS Material Specification Adhesives 9985490 Thread Sealer, Preapplied for Vehicle Applications 1 Scope This specification describes the qualification re- quirements of preapplied thread sealers with no chemical locking. These sealers are used to pre- vent leakage of gases and/or
2、fluids through threaded joints caused by vibration, thermal cy- cling, pressure cycling, thread damage, etc. Sea- lants approved to this specification have a wider temperature usage range than 9985473 ap- proved sealants (-29 to 150C). 1.1 Material Description. Polymeric, water based dispersion cont
3、aining additives and fillers that act as a sealer (no chemical locking) when applied wet to threaded parts and dried to form a non-tacky, non-hardening coating. 1.2 Types. When specific characteristics of an adhesive are needed for an application, adhe- sives can be described by “type” instead of li
4、sting the brand name on the part drawing. Part draw- ings must specify Type I or II, etc. to designate the use of a particular type of adhesive. MATSPC identifies which materials are approved to each type. If a certain type of adhesive is not neces- sary for the application, simply call out “9985490
5、” on the print. 1.3 Symbol. Not applicable. 1.4 Typical Application. Preapplied thread seal- ers have a range of applications including bolts, plugs, nuts, and fittings that require thread seal- ing, but not thread locking, ability. Applications of sealants approved to this specification include eng
6、ine head bolts. Type I and Type II adhesives are specifically for head bolt applications. 1.5 Remarks. 1.5.1 This specification may involve hazardous materials, operations, and equipment. The speci- fication does not address the safety problems associated with its use. It is the responsibility of th
7、e user of this spec to consult and establish ap- propriate safety and health practices and deter- mine the applicability of regulatory limitations prior to use. 1.5.2 These materials are designed for limited reuse using current GM practice of standard fuel internal straight pipe thread (NPSF) with e
8、xternal Dryseal American Standard Pipe Thread Fuel (NPTF) or PTF/NPT with standard intermediate internal straight pipe thread (NPSI). For more information see SAE J476 or ANSI B1.20.3. 1.5.3 Each sealant has its own lubricity (k) factor reducing torque coefficient of threaded assem- blies resulting
9、in lower applied on-torques to achieve sealing or clamp load. Changes in part finish, treatments (oil), and thread size must be evaluated in the end-use application (see 5.4). Failure to determine these effects could lead to damaged parts and/or leakage. 1.5.4 This specification is expressed in SI u
10、nits. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ANSI B1.20.3 SAE J476 2.2 GM Standards/Specifications. 9985473 GMW3001 GM3503M GMW3044 GM6102M GMW3059 GM6103M GMW3179 GM9010P GMW3359 GM9064P 3 Requirements
11、3.1 Definition of Terms. 3.1.1 Prevailing On-Torque. The highest meas- ured torque during nut installation in the on direc- tion. The nut must be in complete engagement with the sealant coated portion of the male thread. 3.2 Test Methods. 3.2.1 Specimen Preparation. All test specimens used in one se
12、ries of tests shall be taken from one lot and shall meet all dimensional require- ments. Copyright 2004 General Motors Corporation All Rights Reserved December 2004 Originating Department: North American Engineering Standards Page 1 of 3 Copyright General Motors North America Provided by IHS under l
13、icense with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 22:55:44 MDTNo reproduction or networking permitted without license from IHS -,-,- 9985490 GM ENGINEERING STANDARDS 3.2.1.1 Test bolts or screws must meet GM6102M and GM Engineering Standard, B100. Test nuts
14、 per GM6103M and GM Engineering Standard, E100. Consult Fastener Engineering on thread engagement length. 3.2.1.2 Samples for qualification must be tested against one of the previously approved sealants which serves as a control group. 3.2.1.3 Sealing test samples shall be M10 x 1.5, property class
15、10.9, and plated with the following finishes: Finishes: A. Zinc phosphate and organic sealer, GMW3179, Code G. B. Non-electrolytically applied zinc rich coat- ing, GMW3359. C. Zinc plating for general use fasteners (organic topcoat), GMW3044 8K240/120G. D. Zinc plating for general use fasteners (no
16、topcoat), GMW3044 8K240/120N. When using these sealants on plugs and fittings, test according to GM3503M instead of using fas- teners. 3.2.1.4 All designated finishes and sizes are to be evaluated for initial approval only. Finishes must be applied by GM approved sources listed in MATSPC. 3.2.2 Prev
17、ailing On-Torque. The test nut shall be assembled onto the pre-applied sealant area of the bolt until the full thickness of the nut is en- gaged into the sealant. The maximum prevailing on-torque shall be measured and recorded during the next 360 degrees of rotation, while the fas- tener is in const
18、ant motion. The speed of rotation shall be 10 to 20 rpm. GM9064P, Torque Tension Test procedure shall be used. The maximum pre- vailing on torque of an M10 shall be 2 Nm. Table 1 references maximum prevailing on torques for common sizes. This test is required for both pro- duction quality control pu
19、rposes (use the produc- tion fastener size) and initial chemical approval (use the various sizes Type 1 shall range from 400 to 600. Type II shall range from 400 to1200. Op- tional Test: Zahn(Brokell) #3 cup, Type 1: 19 to 23 s. Note: Viscosity is critical to proper coverage and performance. Too low
20、 a viscosity results in leaks from inadequate material retention on thread grooves. Too high a viscosity causes uneven coverage from excessive solids and entrapment of air during drying. 3.3.4 Condition of Sealer on Test Parts. The sealant shall be uniform around the circumfer- ence of the test part
21、, and not exceed thread height. Porosity or skips in the sealant are not permitted in coverage area. The sealant shall be dry to the touch, yet not flake off during handling or use. 3.3.5 Coated fasteners shall meet the require- ments of this specification when stored in ship- ping containers at tem
22、peratures up to 35C or normal plant conditions for 6 months. PPAP ap- proval can be granted prior to completion of this data. This test is required for initial chemical ap- proval only. 3.3.6 The applied sealant shall have no adverse effect on the health of personnel when used for its intended purpo
23、se. 3.3.7 The length and location of the sealant shall be specified by the drawing. The first one or two threads must be free of sealant. Test intended production parts when practical. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 All materials supplied to this specification mu
24、st comply with the requirements of GMW3001, Rules and Regulations for Material Specifica- tions. 5.2 All materials supplied to this specification must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved
25、 source is required for this specification. Only sources listed in the GM Materials File (i.e., MATSPC) under this specification number have been quali- fied by engineering as meeting the requirements of this specification. 7 Coding System This material specification shall be referenced in other doc
26、uments, drawings, VTS, CTS, etc. as follows: Material per 9985490 8 Release and Revisions 8.1 Release. This specification was originally issued in July 1982, originally by Buick division. 8.2 Revisions Rev Approval Date Description (Organization) B AUG 1991 Complete Revision Control Div. Changed (GM
27、PT) C DEC 2004 Complete revision including modification to Global format (GMNA Fastening Special- ist Team) Copyright 2004 General Motors Corporation All Rights Reserved December 2004 Page 3 of 3 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 22:55:44 MDTNo reproduction or networking permitted without license from IHS -,-,-