Group standard
TL 52682
Issue 2015-10
Class. No.:55121
Descriptors:
PA66, polyamide 66, glass fiber-reinforced, rervoir, coolant pipe, thermostat housing
PA66, Glass Fiber-Reinforced, for Finished Parts Carrying Coolant Material Requirements
Previous issues
TL 52682: 2009-08, 2010-03, 2011-05Changes
The following changes have been made to TL 52682: 2011-05:–Section 6.7 revid
–Section 6.12 "Internal test pressure" amended by the text in parenthes Scope
This Technical Supply Specification (TL) defines the material requirements for glass fiber-rein‐forced polyamide 66 (PA66) ud in components carrying coolant. Volkswagen standard
VW 50133 applies to components made of PA66-GF30 that do not come in contact with coolant.Designation
Designation example for a coolant pipe made of PA66-GF30:
PA66-GF30 as per TL 52682, black
Requirements General requirements
Approval of first supply and changes as per VW 01155.Emission behavior as per VW 50180.
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2
3 3.1
Always u the latest version of this standard.
This electronically generated standard is authentic and valid without signature.
The English translation is believed to be accurate. In ca of discrepancies, the German version is alone authoritative and controlling.
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All rights rerved. No part of this document may be provided to third parties or reproduced without the prior connt of one of the Volkswagen Group’s Standards departments.
© Volkswagen Aktiengellschaft
VWNORM-2014-06a-patch5
Q U E L L E : N O L I S
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TL 52682: 2015-10
Avoidance of hazardous substances as per VW 91101.The tests must be carried out on specimens from finished parts.Approx. 24 parts are required for complete testing.Properties
The surface and inside of the finished parts must be free of flaws and processing defects (voids,cracks, cold shuts, etc.) that have a negative effect on strength, rvice life, and the required ap‐pearance.
Sink marks in the area of the ribs, stiffening elements, and fittings are only permissible if they do not have a negative impact on installability or function. The parts must permit flawless asmbly.The glass fibers must be evenly distributed in the material to such an extent that the glass fiber content of specimens taken at three different points on a finished part does not differ by more than 1.0%.Manufacture
Injection molding or a related process (water injection technology)Conditioning
Before testing, the specimens must be conditioned in the VW 50554–23/50-2 (23 °C, 50% relative humidity, class 2) standard atmosphere for at least 48 h.Evaluation of the measurement results
The required numerical values apply to each individual measurement.Marking as per German Association of the Automotive Industry (VDA) standard VDA 260
> PA66-GF30 <Materials requirements Material
See ction 6.1.
Polyamide 66, glass fiber-reinforced, heat-stabilized, resistant to hydrolysis Glass fiber content as per German Institute for Standardization (DIN) standard DIN EN ISO 1172
The glass fiber content is determined gravimetrically and must be (30 ±2) weight percent.Moisture content in the as-received condition (drying at 100 °C until constant weight is reached)
The moisture content in the as-received condition at the installation location must be (1.0 to 3.0) weight percent.
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3.3
3.4
3.5
3.6
4 4.1
4.2
4.3
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TL 52682: 2015-10 The moisture content is determined by weighing before and after drying. Constant weight is reached once the weight of the specimen deviates less than 0.2% from the previous weight after a drying cycle.
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Required properties
See table 1.
Table 1
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TL 52682: 2015-10
a)
The requirements apply to new sample inspections and initial sample inspections (basic material suitability test). The purchar re‐rves the right to u the for the evaluation of ries production deliveries as well.
Requirements table 1, conc. no. 14 and table 1, conc. no. 15 do not apply to rervoirs. In‐stead, the requirements of TL 874 apply.Notes on testing Material
The identity test can be performed by infrared spectroscopy.Ball indentation hardness
Measurements must be taken on at least three (20 × 20) mm specimens (2 measurements per specimen). On specimens that have been taken from molded parts with one-sided graining or a paint finish, the grain or paint must be removed using a surface grinding machine. The flat surface created in this way rves as the contact surface. The measurements are taken on the untreated back surface of the specimen.Flexural strength
Determination of the flexural stress under a maximum load as per DIN EN ISO 178, but with a specimen length: (50 ±1) mm; width: (6 ±0.2) mm; thickness matching the product's thickness (up to max. 4 mm); distance between supports: 40 mm; test speed: 14 mm/min.
Specimens taken from molded parts with one-sided graining or a paint finish must be placed on the test machine support in such a way that the grained or painted side faces the loading edge.
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6.2
6.3
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TL 52682: 2015-10
Impact strength
Impact strength test as per DIN EN ISO 179-1, but with a specimen length: (50 ±1) mm; width:(6 ±0.2) mm; thickness matching the product's thickness (up to max. 4 mm); distance between supports: 40 mm; test equipment: 4 J pendulum impact tester.
Specimens taken from molded parts with one-sided graining or a paint finish must be placed on the s
upports of the pendulum impact tester in such a way that the grained or painted side faces the pendulum hammer edge.Notched impact strength
Notched impact strength test (broadside impact) as per DIN EN ISO 179-1, but with a specimen length: (50 ±1) mm, width: (6 ±0.2) mm, thickness matching the product's thickness (up to max.4 mm); distance between supports: 40 mm; test equipment: 4 J pendulum impact tester.
A 0.8 mm-wide U-shaped notch is made on the broad side of the specimens. The notch depth is 1/3 of the specimen thickness. The edges outlining the notch root must have a curvature radius of < 0.1 mm.
Specimens taken from molded parts with one-sided graining or a paint finish are notched on the grained or painted side.Low-temperature behavior
Aging of at least 2 finished parts at (-40 ±1) °C for (22 ±2) h.Processing quality
A minimum of 3 whole finished parts must be aged in coolant as per TL 774-G without added wa‐ter.
Aging duration 48 h at an aging temperature of (135 ±1) °C.
Aging must be performed in a covered container filled with the test medium and equipped with tem‐perature control (e.g., Lauda Ultra thermostat, U12 model, by Messgerätewerk, Dr. Wobr KG).The test parts must be heated to 135 °C together with the test fluid. After coolant aging, the test parts must be rind with tap water and then dried for 3 h at 70 °C in a forced-air oven. They are then evaluated.Lightfastness
Testing as per PV 1303 If the number of periods of exposure is not defined in the drawing, the fol‐lowing rule applies:
3 periods of exposure for components in areas with indirect solar radiation
5 periods of exposure for components in areas with direct solar radiation (e.g., door waist rail).10 periods of exposure for components in areas subject to maximum solar radiation (e.g., rear shelf).Leak tightness test
Leakage on the component is not permissible.
The following methods may be ud for the leak tightness test:
6.4 6.5
6.6
6.7
6.8
6.9
