The English translation is believed to be accurate. In case of discrepancies the German version shall govern. PA66, Glass Fiber-Reinforced, for Bearing Parts Material Requirements Konzernnorm Descriptors: polyamide 66, PA66, glass fiber-reinforced, bearing part, cage, ball bearing, needle bearing TL 539 Changes The following changes have been made as compared to Technical Supply Specification TL 539, 1991-11: Standard restructured Volkswagen standards VW 501 80, VW 501 85 and VW 911 01 added Table 1 and notes on testing revised Previous issues 1965-12; 1969-01; 1976-05; 1990-03; 1991-11 1 Scope This Technical Supply Specification specifies the material requirements for glass-fiber-reinforced PA 6.6 for bearing parts, e.g., cages for ball and needle bearings. 2 Designation (where “xx” stands for the glass fiber portion in %) PA66-GF xx according to TL 539 3 3.1 Requirements General requirements Approval of first supply and changes according to VW 011 55. Emission behavior according to VW 501 80. Resistance to open air weathering according to VW 501 85. Avoidance of hazardous substances according to VW 911 01. 30 bearing parts are required for complete testing. 3.2 Appearance 3.3 Physiological compatibility The materials used must be physiologically safe. Substances that are emitted at elevated temperatures must be toxicologically safe. 3.4 Form FE 41 - 01,03 Manufacture Page Injection molding. Fachverantwortung/Responsibility K-QS-31 Himmel Tel: -24850 Wohlfarth Normung/Standards (EZTD, 1733) Frau Krenz Tel: +49-5361-9-48869 Sobanski Confidential. All rights reserved. No part of this document may be transmitted or reproduced without the prior written permission of a Standards Department of the Volkswagen Group. Parties to a contract can only obtain this standard via the responsible procurement department. © VOLKSWAGEN AG QUELLE: NOLISThe surface and interior of the bearing parts shall be free of flaws and processing defects such as flow lines, voids, cracks or the like. They shall permit proper assembly. The distribution of glass fibers in the material shall be uniform. Norm vor Anwendung auf Aktualität prüfen / Check standard for current issue prior to usage. Klass.-Nr. 55 12 7 March 2004 Page 2 TL 539: 2004-03 3.5 Conditioning Prior to testing, the specimens required for the individual tests must be conditioned for at least 48 h in the DIN 50014 – 23/50-2 standard climate. 3.6 Validity of requirements The required numerical values apply to each individual measurement. 3.7 Identification according to VDA 260 For example: >PA66-GF30< 4 4.1 Material requirements Material See Section 6.1. Polyamide 66, heat stabilized, glass fiber reinforced. 4.2 Color According to drawing. 5 Properties requirements See Table 1. Table 1 No. 1 2 3 4 5 6 7 8 9 9.1 9.2 Property Glass fiber content acc. to DIN EN ISO 1172 Glass fiber length Glass fiber diameter Moisture content acc. to Section 6.2 Density acc. to DIN 53479, buoyancy method Melting temperature acc. to DIN EN ISO 3146, optionally DSC acc. to Section 6.3 Ball indentation hardness acc. to DIN EN ISO 2039-1 Measurement time period 10 s Water absorption acc. to Section 6.4 Behavior in transmission oil acc. to Section 6.5 Weight change Ball indentation hardness acc. to DIN EN ISO 2039-1 Measurement time period 10 s Unit % mm m % g/cm³ °C Requirement 25 ± 2 or 30 ± 2 0.1 to 10.0 1 to 12 ≥ 0.7 1.30 to 1.38 ≥ 255 N/mm² ≥ 180 % 1.5 to 3.5 No change in shape or surface. % ≤ 1.0 N/mm² ≥ 180 Page 3 TL 539: 2004-03 6 6.1 Notes on testing Material The identity test can be performed by infrared spectroscopy. 6.2 Moisture content At least three bearing parts or bearing part sections from at least three different bearing parts shall be weighed with an accuracy of 0.01 g and dried at +100 °C in a vacuum until the weight remains constant. Cooling of the specimens to (23 ± 2) °C, which is necessary for the second weighing procedure, shall be performed in a desiccator. 6.3 Melting temperature If the DSC method is chosen to identify the melting temperature, the following procedure shall be applied: Test equipment such as the DSC 821 from Mettler Toledo can be used. A finished part section with as large a plane contact surface as possible and a mass of approximately 5 mg to 10 mg shall serve as the specimen. Testing parameters: The specimen is heated from +50 °C to +280 °C at a heating rate of 10 °C/min. The examination is carried out in normal atmosphere. 6.4 Water absorption At least two bearing parts shall be weighed in as-received condition with an accuracy of 0.01 g and subsequently aged for (48 ± 2) h in deionized water at (23 ± 2) °C. After the water aging is completed, water adhering to the specimens shall be removed with a compressed air jet that is not excessively strong. This is followed by reweighing. 6.5 Behavior in transmission oil At least two vacuum-dried bearing parts or bearing part sections shall be weighed with an accuracy of 0.01 g and subsequently aged for (48 ± 2) h in hot transmission oil according to TL 521 45 at (120 ± 1) °C. The visual evaluation, reweighing and hardness measurement shall be performed after the specimens have been removed from the test fluid, cooled to (23 ± 2) °C and cleaned. The cleaning (removal of test medium adhering to the specimens) may only be performed by wiping, e.g., with a cotton cloth. The use of a solvent is not permitted. If the component drawing requires resistance to a defined transmission oil, the above-described aging shall be performed in the medium specified in the drawing for at least 1,000 hours. Page 4 TL 539: 2004-03 7 Referenced standards*) Synthetic Transmission Oil API GL 5 SAE 75W-90 / SAE 75W-85; Lubricant Requirements Vehicle Supply Parts, General; Approval of First Supply and Changes Components in Passenger Compartment; Emission Behavior Vehicle Components; Resistance to Open Air Weathering Vehicle Environmental Standard; Vehicle Parts, Materials, Operating Fluids; Avoidance of Hazardous Substances Climates and their Technical Application; Standard Atmospheres Testing of Plastics and Elastomers; Determination of Density TL 521 45 VW 011 55 VW 501 80 VW 501 85 VW 911 01 DIN 50014 DIN 53479 DIN EN ISO 1172 Textile-Glass-Reinforced Plastics – Prepregs, Moulding Compounds and Laminates – Determination of the Textile-Glass and Mineral-Filler Content; Calcination Methods DIN EN ISO 2039-1 Plastics – Determination of Hardness – Part 1: Ball Indentation Method DIN EN ISO 3146 Plastics – Determination of Melting Behaviour (Melting Temperature or Melting Range) of Semi-Crystalline Polymers by Capillary Tube and Polarizing-Microscope Methods VDA 260 Automotive Components; Identification of Materials *) In this section, terminological inconsistencies may occur as the original titles are used.
