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1、Class. No. 55118 March 2006 POM Material Requirements TL 52476 Konzernnorm Descriptors: POM, polyoxymethylene, polyacetal, loudspeaker cover, clip D Page 1 of 5 Fachverantwortung/Technical responsibility Normung/Standards (E2TC, 1733) K-GQL-1/1 Frau Behte Tel.: +49-5361-9-78324 Dr. Schilling Frau Kr
2、enz Tel.: +49-5361-9-48869 Terlinden Confidential. All rights reserved. No part of this document may be transmitted or reproduced without prior permission of a Standards Department of the Volkswagen Group. Parties to a contract can only obtain this standard via the B2B supplier platform “” VOLKSWAGE
3、N AG Norm vor Anwendung auf Aktualitt prfen / Check standard for current issue prior to usage. Form FE 41 - 01.06 Changes The following changes have been made as compared to Technical Supply Specification TL 52476, 2003-01: Standard restructured Type A removed. Type A is continued in TL 52636. Table
4、 1 and notes on testing revised Aging temperature for low-temperature behavior raised from -40 C to -30 C Volkswagen standard VW 501 90 added. Previous issues 1997-11; 2003-01 1 Scope This TL specifies material requirements for finished parts made of polyoxymethylene (POM), e.g. loudspeaker covers,
5、and joining elements (clips). 2 Description POM acc. to TL 52476 3 Requirements 3.1 General requirements Approval of first supply and changes acc. to VW 011 55. Emission behavior acc. to VW 50180 (if required in the drawing and see Section). Resistance to open air weathering acc. to VW 50185. Colori
6、metric evaluation according to VW 50190 (if specified in the drawing). Avoidance of hazardous substances acc. to VW 911 01. 10 finished parts are required for complete testing; for joining elements (like clips), 20 finished parts are needed. 3.1.1 Appearance The surface and interior of the finished
7、parts must be free of flaws and processing defects such as flow lines, cracks, voids, or the like. Sink marks at the base of ribs and reinforcements are permissible only if they do not adversely affect function, appearance and/or assembly of the part. The finished parts shall permit proper assembly.
8、 The English translation is believed to be accurate .In case of discrepancies the German version shall govern. Numerical notation according to ISO practice (see VW 01000). Page 2 TL 524 76: 2006-03 D 3.1.2 Packaging Finished part packaging shall not be air tight to allow air circulation. In case of
9、delivery in large packaging units (cardboard boxes, pallets), they should be stacked or arranged so that air circulation is possible. 3.2 Marking according to VDA 260 POM 3.3 Conditioning Prior to testing, the specimens required for the individual tests must be conditioned for at least 48 h in the D
10、IN 50014 23/50-2 standard climate. 3.4 Evaluation of the measuring results The required numerical values apply to each individual measurement. 3.5 Material See Section 5.2. Polyoxymethylene (POM) homopolymer, or copolymer alternatively. 3.6 Color According to drawing and/or release. 4 Properties See
11、 Table 1. Table 1 No. Property Requirement 1 Density acc. to DIN EN ISO 1183-1, buoyancy method (1,42 0,02) g/cm3 2 Melting temperature acc. to DIN EN ISO 3146, alternatively with DSC see Section 5.3 +166 C to +179 C 3 Dimensional stability under heat acc. to Vicat and DIN EN ISO 306, method B50 145
12、 C 4 Yield stress acc. to DIN EN ISO 527-2 see Section 5.4 60 MPa 5 Elongation acc. to DIN EN ISO 527-2 see Section 5.4 6,5% 6 Impact resistance acc. to DIN EN ISO 179-1/1eU see Section 5.5 No fracture (kJ/m2) 7 Notched impact strength acc. to DIN EN ISO 179- 1/1eA. see Section 5.6 4,5 kJ/m2 Page 3
13、TL 524 76: 2006-03 D No. Property Requirement 8 Elevated-temperature behavior acc. to DIN 53497 see Section 5.7 Finished parts shall exhibit neither brittling nor other changes in shape, color, or surface that are visible and/or impair their function. 9 Low-temperature behavior see Section 5.8 The f
14、inished parts shall remain fully functional at low temperatures; there shall be no damage. They shall not exhibit any cracks or other damage, even after subsequent heating to (23 2) C. 9.1 Ball drop test acc. to Test Specification PV 3905 see Section 5.9 No cracks, no fractures. 10 Lightfastness acc
15、. to PV 1303 see Section 5.10 (Requirement only applies to visible parts in the vehicle interior or if specified in the drawing.) Number of exposure periods acc. to drawing. The exposed surface shall not exhibit changes as compared to the as-received condition, such as change in color, chalking, and
16、/or cracking. Gray-scale level 4 acc. to DIN EN 20105-A02. 11 Burning behavior acc. to US Regulation 571.302 Acc. to TL 1010 (if specified in drawing and/or release) 5 Notes on testing 5.1 Emission behavior If the test results do not comply with the requirements of VW 50180, the parts shall be tempe
17、red until the limit values are met. The temperature shall be selected such that no changes in form, color, and surface occur. 5.2 Material The identity test is performed using infrared spectroscopy. 5.3 Melting temperature If the DSC method is chosen to identify the melting temperature, the followin
18、g procedure shall be applied: Test equipment such as the DSC 821e from Mettler Toledo can be used. A plane parallel finished part section of a weight of approx. 5 mg to 10 mg serves as specimen. Testing parameters: The specimen is heated from +50 C to +200 C at a heating rate of 10 C/min. Afterwards
19、, it is cooled with 5 C/min to +50 C and reheated with 10 C/min to +200 C. The test is carried out in normal atmosphere. Page 4 TL 524 76: 2006-03 D 5.4 Yield stress and elongation Tensile test according to DIN EN ISO 527-2, 5A specimen, test rate 50 mm/min. In case the 5A specimen cannot be prepare
20、d, it is permissible to use S3A tensile specimens (standard test specimens) acc. to DIN 53504. 5.5 Impact strength Test equipment: pendulum impact tester 4J. If for reasons concerning equipment and/or specimen shape and size a test according to Table 1 No. 6 cannot be performed, the following proced
21、ure may be substituted: Impact resistance test (broadside impact) according to DIN EN ISO 179-1; deviating specimen length: (50 1) mm, width: (6 0,2) mm, thickness according to product thickness (up to max. 4 mm); mounting flange interval (support separation): 40 mm, test equipment: pendulum impact
22、tester 4J. Specimens taken from finished parts grained or painted on one side are placed on the mounting flange of the pendulum impact tester so that the grained or painted side faces the direction of impact. Note that this procedure requires prior agreement. 5.6 Notched impact strength Test equipme
23、nt: pendulum impact tester 4J. If for reasons concerning equipment and/or specimen shape and size a test according to Table 1 No. 7 cannot be performed, the following procedure may be substituted: Impact resistance test (broadside impact) according to DIN EN ISO 179-1; deviating specimen length: (50
24、 1) mm, width: (6 0,2) mm, thickness according to product thickness (up to max. 4 mm); mounting flange interval (support separation): 40 mm, test equipment: pendulum impact tester 4J. The specimens are given a 0.8 mm wide U-shaped notch on the broad side. The notch depth shall be 1/3 the specimen th
25、ickness. The edges adjoining the base of the notch shall have a curvature radius of 0,1 mm. Finished parts with one-sided graining shall be notched on the grained side and subsequently placed on the pendulum impact testers mounting flanges in such a manner that the center of the notch is precisely w
26、ithin the impact plane. Care shall be taken that the notch is located on the side away from the direction of impact. Note that this procedure requires prior agreement. 5.7 Elevated-temperature behavior Aging test at elevated temperature according to DIN 53497, method B, on at least one complete fini
27、shed part; aging temperature (+90 1) C; aging period (22 + 2) h. 5.8 Low-temperature behavior A minimum of two complete finished parts are aged in air at (-30 1) C; aging period (22 + 2) h. 5.9 Ball drop test Ball drop test acc. to PV 3905, however, base plate (specimen support) made from 10 mm thic
28、k sheet steel without recess on at least three finished parts. Ball drop height (450 5) mm. Page 5 TL 524 76: 2006-03 D 5.10 Lightfastness If the number of exposure periods is not defined in the drawing, the following rule applies: 3 periods of exposure for components in areas with indirect sun radi
29、ation. 5 periods of exposure for components in areas with direct sun radiation (e.g. door upper trim). 10 periods of exposure for components in areas subject to the highest sun radiation (e.g. rear shelf). 6 Referenced standards1 TL 1010 Materials for Vehicle Interiors; Flammability, Material Requir
30、ements PV 1303 Non-Metallic Materials; Exposure Test of Passenger Compartment Components PV 3905 Organic Materials; Ball Drop Test VW 01155 Vehicle Supply Parts; Approval of First Supply and Changes VW 50180 Components in Passenger Compartment; Emission Behavior VW 50185 Vehicle Components; Resistan
31、ce to Open Air Weathering VW 50190 Components of the Vehicle Interior Trim; Colorimetric Evaluation VW 91101 Environmental Standard for Vehicles; Vehicle Parts, Materials, Operating Fluids; Avoidance of Hazardous Substances DIN 50014 Climates and Their Technical Application; Standard Atmospheres DIN
32、 53497 Testing of Plastics; Hot Storage Test on Mouldings Made of Thermoplastic Moulding Materials without External Mechanical Stressing DIN 53504 Testing of Rubber; Determination of Tensile Strength at Break, Tensile Stress at Yield, Elongation at Break and Stress Values in a Tensile Test DIN EN IS
33、O 179-1 Plastics; Determination of Charpy Impact Properties, Part 1: Non- Instrumented Impact Test DIN EN ISO 306 Plastics Thermoplastic Materials Determination of Vicat Softening Temperature (VST) DIN EN ISO 527-2 Plastics - Determination of Tensile Properties Part 2: Test Conditions for Moulding a
34、nd Extrusion Plastics DIN EN ISO 1183-1 Plastics Methods for Determining the Density of Non-Cellular Plastics Part 1: Immersion Method, Liquid Pyknometer Method and Titration Method DIN EN ISO 3146 Plastics, Determination of Melting Behaviour (Melting Temperature or Melting Range) of Semi-Crystallin
35、e Polymers by Capillary Tube and Polarizing-Microscope Methods DIN EN 20105-A02 Textiles Tests for Colour Fastness Part A02: Grey Scale for Assessing Change in Colour VDA 260 Motor Vehicle Components; Marking of Materials 1 In this section terminological inconsistencies may occur as the original titles are used.