1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW6754 Determination of Electrostatic Behavior of Automotive Textiles Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: GME Specification Center Page 1 of 9 1 Scope Note: Nothing in this standard supercede
2、s applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This standard is used to evaluate the electrostatic properties of an automobile textile by either measurement of surface resistance or
3、 measurement of the materials ability to resist accumulation of static charge. 1.2 Foreword. Not applicable. 1.2.1 Summary of Test Method. 1.2.1.1 Method A - Electrostatic Resistance. Two (2) electrodes are placed onto the surface of the test specimen. A known voltage is applied to the disc electrod
4、e and the surface resistance is measured by the ring electrode. 1.2.1.2 Method B Electrostatic Charging. After rubbing the electrically neutralized test specimen(s) with standard cloths in a prescribed manner, the resulting static charge (voltage) is measured. 1.3 Applicability. This standard is app
5、licable to upholstery fabrics. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. CEI/IEC 93 JIS L0803 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Facilities. Not applicable
6、. 3.2 Equipment. Note: Method B should be performed only on fabrics with anti-static treatment. 3.2.1 Method A Electrostatic Resistance (see Figure A1). 3.2.1.1 Power Supply capable of producing a steady direct voltage with the following characteristics: x Operating Voltage: (100 5) V 3.2.1.2 A high
7、 range ohm meter with a measuring range of: x (108 to 1012) and measuring accuracy of: x Measuring Range 1010 10 % (e.g., is always following Teraohm-Meter Type H12 or equivalent, manufacturer: Knick Elektronische Messgerte GmbH, Beuckestrae 22, D-14163 Berlin.) Provided by IHSNot for ResaleNo repro
8、duction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW6754 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 2 of 9 3.2.1.3 Electrode System. See Figure A1 or for additional reference see ICE 93, Section 7 with the set-up illust
9、rated in Figure A2 (e.g. Measuring Electrode ID-Nr. 301 300, Fetronic GmbH, Ursulaweg 91, D-40748 Langenfeld). 3.2.1.3.1 Ring Electrode. (3 0.1) mm thick metal ring with an inner diameter of (69.2 0.05) mm and an outer diameter of (89 0.05) mm. 3.2.1.3.2 Disc Electrode. (3 0.1) mm thick metal disc w
10、ith a diameter of (50.4 0.05) mm. 3.2.1.3.3 Insulating Layer: Layer of insulation between the electrodes and the shielding plates. 3.2.1.3.4 Metallic Shielding Plate. Metal plates above the insulating layers. 3.2.1.4 Metallic base plate (12 /+1) mm thick, diameter (110 /+2) mm with a layer of insula
11、ting material having a maximum thickness of 1 mm Polytetraflouroethylene (PTFE) or equivalent insulating characteristics. 3.2.1.5 Cylinder of insulating material large enough to support the metallic base plate. x Plexiglas or equivalent. 3.2.1.6 Apparatus for conditioning to the appropriate temperat
12、ure and humidity requirements of (20 2) C and (50 5) % relative humidity for 24 h minimum. 3.2.2 Method B Electrostatic Charging (see Figure A3). 3.2.2.1 Static Charge Measuring Device. Consisting of a mechanism which rotates a drum at (400 10) min-1 having four equally spaced nodes, to one of which
13、 the test specimen is attached. At one point of the revolution, the sample is rubbed across a standard test fabric and, at another point of the revolution; the sample is brought by an electrode. The electrode is connected to an amplifier to boost the charge. Equipment satisfying this description can
14、 be purchased from: Daiei Kagaku Seiki Seisakusho, Okazaki Tokunari-cho 15-8, Sakyo-ku, Kyoto-shi, Japan 606 3.2.2.2 Oscilloscope or recorder. Used to record the amplified charge. 3.2.2.3 Static Eliminator any device capable of discharging a stored static charge on the surface of the test specimens.
15、 3.2.3 Apparatus for conditioning to the appropriate temperature and humidity requirements of (20 2) C and (40 2) % relative humidity. 3.2.4 Suitable cutting tools for preparation of test specimens. 3.3 Test Vehicle/Test Piece. 3.3.1 Method A Electrostatic Resistance. 3.3.2 Method B Electrostatic Ch
16、arging. 3.3.2.1 Cotton and Wool Standard Fabrics. Ten (10) (25 /-3) mm x (150 5) mm pieces of each one are required. The width of the standard fabrics shall be trimmed so that the final width is less than the width of the opening of the sample holder. All standard fabric specimens shall be cut with
17、the longer dimension taken from the warp direction. 3.3.2.1.1 White Cotton Standard Fabric. The white cotton standard fabric (known as “Kanakin 3”) is a plain flat woven made with 20 textile cotton thread in the warp direction (141 threads per 5 cm) and 16 textile cotton threads in the fill directio
18、n (135 threads per 5 cm) having a weight of (100 1) g/m2. 3.3.2.1.2 White Wool Standard Fabric. The white wool standard fabric (known as “Mosurin”) is a plain flat woven made with 19 textile worsted yarn in the warp direction (142 threads per 5 cm) and 15 textile worsted yarn in the fill direction (
19、136 threads per 5 cm) having a weight of (102 1) g/m2. 3.3.2.1.3 Notes. The two standard fabrics can be purchased, by the names “Kanakin 3” and “Mosurin”, from Japan Standards Association, 4 Chome 1-24, Alaska, Minato-ku,Tokyo-to, Japan 107-8440. If other standard fabric material is used, that infor
20、mation shall be included in the test report. These specifications have been taken from JIS L0803. 3.3.2.1.4 Double-Faced Tape. Minimum of 4.5 mm wide and 0.1 mm thick. 3.4 Test Time. x Calendar time: 2 days x Test hours: 1.5 h x Coordination hours: 27 h Provided by IHSNot for ResaleNo reproduction o
21、r networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW6754 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 3 of 9 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. 4.1.1 M
22、ethod A Electrostatic Resistance. 4.1.1.1 Conditioning. Surface resistance is particularly sensitive to temperature changes. It is therefore necessary to measure the surface resistivity of the test specimen immediately after conditioning it under the specified conditions of (20 2) C and (50 5) % rel
23、ative humidity for a minimum of 24 h. The test can be conducted under the same conditions or immediately upon removal from those conditions. 4.1.1.2 A minimum of three (3) (120 5) mm x (120 5) mm minimum test specimens shall be cut from various areas of the test material. The test specimens shall be
24、 parallel to thread directions of the material. 4.1.2 Method B Electrostatic Charging. 4.1.2.1 Dry the test specimens and standard fabric for (60 5) minutes at (+70 3) C then condition at (+20 2) C and (40 2) % relative humidity for a minimum of 24 h. The test can be performed under the same conditi
25、ons or immediately upon removal from those conditions. Always handle samples with clean white gloves. 4.1.2.2 Cut ten (10) test specimens each, (80 3) mm x (50 2) mm, with the long dimension being cut in the warp or machine direction for five (5) of the specimens, and in the fill or across-machine d
26、irection for the other five (5). Cut the specimens so that the static electricity conductive fibers, if used, run through the center of the specimens. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have b
27、een agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Method A Electrostatic Resistance. Immediately prior to each series of tests, the insulation of the measuring equipment shall be checked by following the test procedu
28、re, without a test specimen, on a fully insulated test surface. Stray electrical charges can have serious effects on the test and shall be avoided. A very high reading approaching infinity should be seen. 4.3.1.1 The metallic base plate is placed on top of a cylinder of insulating material with the
29、thin insulation layer facing up. 4.3.1.2 Place the scrim or back side of the test specimen on top of the insulation layer of the base plate and place the electrode system centrally on the face side of the test specimen. (Reference Figure A2 for wiring diagram.) 4.3.1.4 Apply the specified direct vol
30、tage and measure the surface resistance after (60 2) s. 4.3.2 Method B Electrostatic Charging (see Figure A3). 4.3.2.1 Connect the static charge measuring device and the oscilloscope (recorder). 4.3.2.2 Set the span between the electrode (5), and the test specimen holder (4) at (15 1) mm. 4.3.2.3 Ap
31、ply the static eliminator to the test specimen and one standard test fabric to zero the charge. 4.3.2.4 Grip the standard fabric in the standard fabric holders (6), so that the clamp distance is (130 3) mm. 4.3.2.5 Attach the (500 10) g weight (8) to the holder. 4.3.2.6 Apply double-faced tape along
32、 the two long sides of the test specimen holder as shown in Figure A6. 4.3.2.7 In the direction shown in Figure A6, apply sufficient tension to remove the wrinkles from the test specimen. While maintaining that tension, adhere the test specimen face-up to the double-faced tape. 4.3.2.8 Clamp the tes
33、t specimen in place by securing the upper part of the test specimen holder. 4.3.2.9 Bring the test specimen directly above the standard fabric. While keeping the standard fabric horizontal, adjust the standard fabric holders equally until there is a gap of (0 0.5) mm between the test specimen and st
34、andard fabric. 4.3.2.10 Adjust the height of the left guide 1 mm higher and the right guide 3 mm higher. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW6754 Copyright 2011 General Motors Company All Rights Reser
35、ved November 2011 Page 4 of 9 Note: “Left guide” refers to the guide which is on the same side of the test specimen as the weight. “Right guide” refers to the guide on the opposite side (see Figure A7). 4.3.2.11 Start the motor, cycle for (60 2) s, then measure the voltage. 4.3.2.12 Stop the motor.
36、4.3.2.13 Repeat the test until five warp and five fill specimens have been tested. 4.3.2.14 Change the standard fabric to the second type and repeat steps 4.3.2.1 through 4.3.2.13. 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. 5.2.1 Method A Electrostatic Resistance. The me
37、asured surface resistance shall be noted and the highest of the individual measurements, in ohms, recorded as the surface resistance of the material. 5.2.2 Method B Electrostatic Charging. Calculate the average of the voltage readings taken for all five (5) test specimens in both the warp and fill d
38、irections, for each standard fabric used. (Four averages of five test specimens will result, with two averages for each standard fabric used.) 5.3 Test Documentation. 5.3.1 Report. 5.3.2 Method A Electrostatic Resistance. 5.3.2.1 The measured surface resistance shall be noted, in ohms, and the highe
39、st of the individual measurements is reported as the surface resistance of the material. 5.3.3 Method B Electrostatic Charging. 5.3.3.1 Report the average voltage reading for both the warp and fill directions, for both the cotton and wool standard test fabrics. 6 Safety This standard may involve haz
40、ardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations
41、 prior to use. 7 Notes 7.1 Glossary. Scrim: Backside. 7.2 Acronyms, Abbreviations, and Symbols. PTFE Polytetraflouroethylene rpm Revolutions per minute Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW6754 Copyrig
42、ht 2011 General Motors Company All Rights Reserved November 2011 Page 5 of 9 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW6754 Method A Where: GMW = Validation Area (GM Worldwide) 6754 = Continuous Number A = Test Method -60 = Category
43、9 Release and Revisions This standard was originated in March 2001. It was first approved by Worldwide Fabric Specification Team in April 2001. It was first published in April 2001. Issue Publication Date Description (Organization) 1 APR 2001 Initial publication (Worldwide Fabric Specification Team)
44、. 2 NOV 2011 Revision. Five year refresh. Not to template. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW6754 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 6 of 9 Appendix A Figur
45、e A1: Electrode System Figure A2: Basic Connection used for Surface Resistivity Figures A1 and A2 Legend Electrostatic Resistance Measuring Device 1. Metallic Base Plate 2. Layer of high insulating material (PTFE or equivalent). 3. Metal disc electrode. (stainless steel or equivalent) 4. Metal ring
46、electrode. (stainless steel or equivalent) 5. Metallic shielding plate (part of electrode system design) 6. Cylinder of insulating material (Plexiglas or equivalent) 7. Insulating Layer (part of electrode system design) 8. Test Specimen 9. High range ohm meter and 100 V source 9 Provided by IHSNot f
47、or ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW6754 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 7 of 9 Figure A3: Static Charge Measuring Device 1. Motor 2. Rotating Drum (Outside Diameter (150 1) m
48、m, width 60 mm, speed (400 10) min-1) 3. Test Specimen Base (see Figure A4) 4. Test Specimen Holder (see Figure A5) 5. Electrode 6. Standard Fabric Holder (width (25 1) mm, clamp distance (130 3) mm) 7. Standard Fabric 8. Weight (500 10) g 9. Amplifier Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW6754 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 8 of 9 Figure A4: Test Specimen Base Figure A5: Test Specimen Holde
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