Test Method Materials
GMW3221
Procedure for Standard Conditioning of Organic Materials
boatman1Scope
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This document describes the general procedure to be ud for standard conditioning of organic material test specimens.
The conditioning of the materials at standard tem-perature and humidity conditions will aid in obtai
ning repeatable and comparable test results.
Note:Nothing in this test method superdes appli-cable laws and regulations unless a specific exemp-tion has been obtained.
Note:In the event of a conflict between the Eng-lish and the domestic language,the English language shall take precedence.
2References
2.1Normative.None.2.2GM.GMI 60300
HN 0022
3Test Equipment
3.1Temperature Controlling Equipment.Heating and/or cooling equipment with air circulation capable of maintaining an environment at a temperature of (+22±3) C.
3.2Humidity Controlling Equipment.Humidifying equipment,if required with the ability of maintaining an environment at the relative humidity (RH)require-ments bad on the following coding.
Code A (50±5)%RH Code B (50±10)%RH Code C (65±10)%RH九年级上册历史复习提纲
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Code D
No RH control or measurement
The appropriate code shall be referenced in the appli-cable Material Specification or Test Method.3.3Oven.Air circulating oven.
4Test Material
Not applicable.
heracles sk5Test Method
5.1Summary of Test Method.Organic material test specimens are maintained in an environment at a specified temperature and relative humidity for a spe-cific period to achieve a state of equilibrium immedi-ately prior to conducting certain tests.This will aid in obtaining test results that are repeatable and compa-rable.
公里的英文5.2Test Sample Preparation.
5.2.1Pre-dry materials with hygroscopic characteris-tics,such as polyamides,polyurethanes,wool,cotton or fiberboard,in an oven until an approximately con-stant weight is achieved.
5.2.2All other materials do not require pre-drying.5.3Test Procedure.
5.3.1Condition organic material test specimens for at least 24hours in an environment having a tempera-ture of (+22±3) C and a relative humidity as spec-ified by the appropriate code (paragraph 3.2),refer-enced in the applicable Material Specification or Test Method.
5.3.2Test specimens or material samples to be ud to produce test specimens shall be positioned in the conditioning environment such that,wherever possi-ble,all material faces are expod to the conditioning atmosphere.It is preferable that small samples/spec-imens shall be freely suspended in the area,and that larger samples/specimens be supported on a wire rack.If a conditioning cabinet is ud,samples shall also be evenly distributed inside the cabinet.During the conditioning period,frequent disturbance of the conditioning environment shall be avoided.T esting shall be conducted in the conditioned environment or immediately (≤5minutes)after removal from the con-ditioned environment.
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6Evaluation and Rating
Not applicable.
7Report
7.1Deviations from this Test Method.Deviations from the conditions of this T est Method shall have
©Copyright 2000General Motors Corporation All Rights Rerved
Originating Department:North American Engineering Standards,Records and Documentation
December 2000Page 1of 2
GMW3221GM WORLDWIDE ENGINEERING STANDARDS
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strengthbeen agreed upon between supplier and vehicle man-ufacturer.All deviations shall be specified on the com-ponent drawings,material specifications,etc.and shall be indicated on test certificates,reports etc.
8Safety
This method may involve hazardous materials,opera-tions and equipment.This method does not propo to address all the safety problems associated with its u.It is the responsibility of the ur of this method to establish appropriate safety and health practices and determine the applicability of regulatory limita-tions prior to u.
9Coding System
This test method shall be referenced in other docu-ments,drawings,VTS,CTS,etc.as follows: Example:
T est to GMW3221Code A
Where
GMW=Validation Area(GM
Worldwide)
3221=Continuous Number Code A=Relative Humidity
Code(Paragraph3.2)
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10Relea and Revisions
10.1Relea.This specification was first approved in AUG2000and published in DEC2000.
This document was written by the Worldwide Fab-ric Specification Team to make common the differ-ent standard conditions ud within GM.The are GMI60300(GME,GMB,Saab Automobile,Holden, Isuzu Motors and Delta Motor),HN0022(Holden)and all NA Material Specifications(NA).
©Copyright2000General Motors Corporation All Rights Rerved
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