VW50123_EN_2007-10-01
Group Standard
VW 50123
2007-10
Class. No.: 55124
Descriptors:
TPE, TPU, TPO, TPS, TPC, TPA, thermoplastic, elastomer, Santoprene, Sarlink, Thermoplast K, Hytrel, Arnitel
Check standard for current issue prior to usage.The English translation is believed to be accurate. In case of discrepancies the German version shall govern. Numerical notation acc. to ISO practice.
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Technical responsibility
Standards department
K-GQS-1/4 Peter Schulz Tel.: +49-5361-9-24365
K-GQL-1/4 Dr. Lutz Wohlfarth Tel.: +49-5361-9-26049 K-GQL-1
Dr. Thomas Schilling
EKTC/4 Ute Hager-Sü?
Tel.: +49-5361-9-49035
EKTC
Manfred Terlinden
Confidential. All rights reserved. No part of this document may be transmitted or reproduced without the prior permission of a Standards department within the Volkswagen Group. Contract partners shall obtain the standard only through the B2B supplier platform https://www.360docs.net/doc/588913648.html,.
? VOLKSWAGEN AG vwnorm-2007-07
Thermoplastic Elastomers Quality Requirements
Previous issues 2000-10, 2005-04
Changes
The following changes have been made as compared to Volkswagen standard VW 50123, 2005-04:
─
Section "Types of low hardness" modified
1
Scope
This standard contains quality requirements for materials on the basis of thermoplastic elastomers (TPE) for motor vehicle components. 2 Definitions
2.1
Thermoplastic elastomers (TPE)
Thermoplastic elastomers are elastomers that have a flow transition at temperatures above the application range.
These elastomers are multi-phase materials that contain hard and soft segments as blocks in the main chain or hard segments grafted as side chains on flexible base chains. The soft segments form the movable areas necessary for the rubber elasticity. The cross-linked areas of these materials are relatively easy to split by means of heat and thus limit the characteristic rubber elastic application at higher temperatures. The thermoreversible cross-linkage of the TPE allows for thermoplastic-like processing.
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2.2 Type groups
2.2.1 Types of low hardness
Hardness range ≤ 65 Shore A and hardness range > 65 Shore A.
Material markings no longer permitted for new designs Material markings valid for new designs (acc. to DIN EN ISO 18064)
Description examples:
Thermoplastic polyurethane (TPE-U) > PUR < Thermoplastic polyurethane (TPU)
> TPU-ARES < (aromatic hard segments / soft ester segments)
> TPU-ARET < (aromatic hard segments / soft ether segments)
Thermoplastic EPDM/PP elastomer (TPE-O/V)
> EPDM+PP < Thermoplastic EPDM/PP elastomer
(TPO / TPV)
> TPO-(EPDM+PP) < for elastomer phases that are not cross-linked
> TPV-(EPDM+PP) < for cross-linked elastomer phases
Thermoplastic styrene block copolymer (TPE-S)
> PS/PE/PB < Thermoplastic styrene block copolymer (TPS) > TPS-SBS <
2.2.2 Types of high hardness
Hardness range 40 to 50 Shore D.
Material markings no longer permitted for
new designs
Material markings valid for new designs
Thermoplastic copolyetherester elastomer (TPE-E)
> TEEE < Thermoplastic copolyetherester elastomer (TPC)
> TPC-EE <
Thermoplastic polyether block amide elastomer (TPE-A)
> PEBA < Thermoplastic polyether block amide elastomer (TPA)
> TPA-ES <
3 Description
Description example for a black, light-resistant Santoprene?with a preferred hardness of 60 Shore A and a density of 1,04 g/cm3.
TPO-(EPDM+PP) acc. to VW 50123 – 60 Shore A, black, 1,04 g/cm3, light-resistant
4 Requirements
4.1 General requirements
Approval of first supply and changes acc. to Volkswagen standard VW 01155.
Avoidance of hazardous substances acc. to VW 91101.
TPE quality is preferably tested on components, component sections or, in exceptional cases, on test plates.
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VW 50123: 2007-10 On principle, samples shall be delivered with an indication of the manufacturer’s quality
designation.
The number of parts required for laboratory tests must be agreed upon with the responsible material laboratory.
During the manufacture of plate material, anisotropic effects (= orientation of macromolecules during manufacture) can be expected as a result of the plastic injection process. This leads to differences in the mechanical characteristic values for strength and elongation depending on the direction of the orientations. This must be taken into consideration during testing.
To do this, corresponding specimens shall be taken from the plate material in longitudinal and crosswise direction and torn apart. Generally, the specimens taken crosswise to the direction of orientation of the macromolecules exhibit lower strength and elongation values.
The specimens to be used for laboratory testing acc. to this standard shall be taken crosswise to the orientation of the macromolecules.
4.2 Evaluation of the measuring results
The required numerical values apply to each individual measurement.
Parts whose grades cannot be classified on the basis of this standard require a separate Technical Supply Specification or notes in the drawing.
4.3 Color in as-received condition
According to drawing.
4.4 Appearance
No visible flaws, inclusions, etc.
4.5 Material identification
4.5.1 IR, PY-GC/MS coupling
Pyrolysis GC/MS acc. to Test Specification PV 3935.
4.5.2 Thermogravimetry
See Section 6.1.
Volatile, polymer and nonvolatile portions shall be specified.
4.5.3 DSC
See Section 6.2.
The following shall be specified: Enthalpy of fusion, melt range (beginning of melt applies as T m, not the maximum peak), curves for 1st heating, 1st crystallization, 2nd heating and 2nd crystallization.
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4.5.4 Dimensional stability under heat acc. to DIN EN ISO 306, method B
Only if required in the drawing, acc. to released sample.
4.5.5 Density acc. to DIN EN ISO 1183
Specification acc. to drawing.
4.6 Hardness
4.6.1 Shore A
Hardness range 55 to 80 Shore A for TPE that are subjected primarily to daytime light and weather factors (e.g. TPO, TPV like Santoprene?, Sarlink?, Thermoplast K?).
4.6.2 Shore D
Hardness range 40 to 50 Shore D for TPE that can also come into contact with operating fluids, such as oils, greases, fuels, crankcase gases (limited resistance) (e.g. TPC such as Hytrel?, Arnitel?).
4.7 Low-temperature elasticity after 22 h aging at -40 °C
4.7.1 General
No cracks or fracture under manual bending stress.
4.7.2 Freeze temperature T G
According to drawing.
4.8 Ozone resistance acc. to VW 2.8.1, mounted similar to installed condition
Free of cracks.
4.9 Burning behavior acc. to Technical Supply Specification TL 1010
According to drawing.
4.10 Lightfastness acc. to VW 2.8.1
No changes compared to as-received condition, e.g. discoloring, embrittlement, decomposition, cracks. Only required if "lightfastness" is specified additionally in the drawing.
4.11 Emission behavior according to VW 50180
According to drawing.
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5 Properties
Hardness range Shore A, see Table 1.
Hardness range Shore D, see Table 2.
Table 1 – Hardness range Shore A
No. Property Unit Requirement
1 Hardness acc. to DIN 53505
1.1 As-received condition (preferred
hardness)
Shore A Acc. to sample
1.2 Change as compared to as-received condition
1.2.1 After aging at elevated temperature,
see Section 6.3
Shore A 0 to +3
1.2.2 After aging in operating fluids
see Section 6.4,
medium according to drawing Shore A Only if required in the drawing. Limit values to be specified.
2 Weight change after aging in operating
fluids,
see Section 6.4,
medium according to drawing % Only if required in the drawing. Limit values to be specified.
3 Tensile strength acc. to DIN 53504
3.1 As-received condition N/mm2
3.2 After aging at elevated temperature,
see Section 6.3 N/mm2
> 6 for as-received harnesses ≤ 65
Shore A,
> 12 for as-received harnesses > 65
Shore A
3.3 After aging in operating fluids,
see Section 6.4,
medium according to drawing N/mm2Only if required in the drawing. Limit values to be specified.
4 Elongation at tear acc. to DIN 53504
4.1 As-received condition %
4.2 After aging at elevated temperature,
see Section 6.3
% > 250
4.3 After aging in operating fluids
see Section 6.4,
medium according to drawing % Only if required in the drawing. Limit values to be specified.
5 Tear propagation strength according to
DIN ISO 34-1, method A,
as-received condition
N/mm > 8
6 Permanent deformation acc. to PV 330
7 % Acc. to drawing
7 Rebound resilience acc. to DIN 53512 % Only if required in the drawing. Limit
values to be specified.
Table 2 – Hardness range Shore D
No. Property Unit Requirement
1 Hardness acc. to DIN 53505
1.1 As-received condition (preferred
hardness)
Shore D 55 ±3
1.2 Change as compared to as-received condition
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No. Property Unit Requirement
Shore D 0 to +3
1.2.1 After aging at elevated temperature,
see Section 6.3
1.2.2 After aging in operating fluids,
see Section 6.4,
medium according to drawing
1.2.2.1 Engine oil acc. to TL 52185 Shore D ± 5
1.2.2.2 Transmission oil acc. to TL 726 Shore D ± 5
1.2.2.3 Grease acc. to TL 735 and TL 745 Shore D ± 5
1.2.2.4 Gasoline FAM 2 acc. to VW 2.8.1 Shore D 0 to -15
1.2.2.5 Diesel fuel acc. to DIN ISO 1817 – F Shore D 0 to -15
Shore D 0 to -15
1.2.2.6 Vegetable oil methyl ester acc. to
DIN EN 14214
1.2.2.7 Brake fluid acc. to TL 766 Shore D Acc. to drawing 1.2.2.8 Coolant acc. to TL 774 Shore D Acc. to drawing
1.2.2.9 Medium acc. to drawing Shore D Acc. to drawing
2 Weight change after aging in operating fluids,
see Section 6.4,
medium according to drawing
2.1 Engine oil acc. to TL 52185 % ± 5
2.2 Transmission oil acc. to TL 726 % ± 5
2.3 Grease acc. to TL 735 and TL 745 % ± 5
2.4 Gasoline FAM 2 acc. to VW 2.8.1 % 0 to +30
2.5 Diesel fuel acc. to DIN ISO 1817 – F % 0 to +15
% 0 to +15
2.6 Vegetable oil methyl ester acc. to
DIN EN 14214
2.7 Brake fluid acc. to TL 766 % ± 5
2.8 Coolant acc. to TL 774 % ± 5
2.9 Medium acc. to drawing % ± 5
3 Tensile strength acc. to DIN 53504
3.1 As-received condition N/mm2> 30
N/mm2> 30
3.2 After aging at elevated temperature,
see Section 6.3
3.3 After aging in operating fluids,
see Section 6.4,
medium according to drawing
3.3.1 Engine oil acc. to TL 52185 N/mm2> 25
3.3.2 Transmission oil acc. to TL 726 N/mm2> 25
3.3.3 Grease acc. to TL 735 and TL 745 N/mm2> 25
3.3.4 Gasoline FAM 2 acc. to VW 2.8.1 N/mm2> 20
3.3.5 Diesel fuel acc. to DIN ISO 1817 – F N/mm2> 25
3.3.6 Vegetable oil methyl ester acc. to
N/mm2> 25 DIN EN 14214
3.3.7 Brake fluid acc. to TL 766 N/mm2> 25
3.3.8 Coolant acc. to TL 774 N/mm2> 25
3.3.9 Medium acc. to drawing N/mm2> 25
4 Elongation at break acc. to DIN 53504
4.1 As-received condition % > 450
4.2 After aging at elevated temperature,
% > 450 see Section 6.3
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4.3 After aging in operating fluids
see Section 6.4
medium according to drawing
4.3.1 Engine oil acc. to TL 52185 % > 450
4.3.2 Transmission oil acc. to TL 726 % > 450
4.3.3 Grease acc. to TL 735 and TL 745 % > 450
4.3.4 Gasoline FAM 2 acc. to VW 2.8.1 % > 300
4.3.5 Diesel fuel acc. to DIN ISO 1817 – F % > 300
4.3.6 Vegetable oil methyl ester acc. to
DIN EN 14214
% > 300
4.3.7 Brake fluid acc. to TL 766 % > 450
4.3.8 Coolant acc. to TL 774 % > 450
4.3.9 Medium acc. to drawing % > 450
5 Tear propagation strength acc. to
DIN ISO 34-1
N/mm > 40
6 Notched impact strength acc. to
DIN EN ISO 179-1 at +23 °C kJ/m2Acc. to sample; only if required in the drawing.
7 Behavior with respect to crankcase gases
acc. to PV 3936 Acc. to sample; only if required in the drawing.
6 Notes on testing
6.1 Thermogravimetry
E.g. Perking Elmer’s test equipment DSC7 may be used as testing device.
A finished part section weighing approx. 10 mg, which has been chopped into pieces with an edge length of ≤ 1 mm by means of an appropriate tool, serves as a specimen.
The specimen is heated under nitrogen from +50 °C t o +700 °C at a heating rate of 20 °C/min and then cooled under nitrogen to +400 °C at 20 °C/min.Subsequently, the nitrogen atmosphere is replaced by oxygen. The specimen is now heated from +400 °C to +800 °C at a heating rate of 40 °C/min. The final temperature is maintained for 15 min. The flow rate of the test gases is 70 ml/min. At least 3 specimens removed from different areas of the finished part shall be tested.
6.2 DSC
E.g. Perking Elmer’s test equipment DSC7 may be used as testing device.
A plane parallel finished part section of a weight of approx. 10 mg serves as specimen.
The specimen is heated from +50 °C to +310 °C at a heating rate of 10 °C/min. Subsequently, the specimen is cooled down to +150 °C at 5 °C/min and then heated again to +310 °C at a heating rate of 10 °C/min. The test is carried out in norma l atmosphere.
To evaluate the enthalpy of fusion of the polymer, the residue determined in the thermogravimetry must be subtracted from the real specimen weight.
6.3 Aging at elevated temperature
Aging in the mechanical circulation oven acc. to DIN 53508. Aging durations and temperatures shall be agreed upon. Measurements to be taken after cooling to room temperature (23 ± 2) °C.
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6.4 Aging in operating fluids
6.4.1 Gasoline
The specimens are aged in FAM test fluid acc. to DIN 51604-2 (FAM 2).
Composition:
─84,5 volume percent FAM test fluid acc. to DIN 51604-1 (FAM 1),
─15,0 volume percent methanol,
─0,5 volume percent water.
Other test fluids may be used if required (deviations acc. to drawing).
168 h aging (other aging durations acc. to drawing) at room temperature (23 ± 2) °C; the specimen shall be dabbed off with filter paper (black band) after aging; evaluation shall begin after 1 minute (in justified cases, which must be agreed upon, evaluation may also begin 15 minutes after removal).
6.4.2 Diesel fuel, fatty acid methyl ester (FAME)
168 h aging at room temperature (23 ± 2) °C. In jus tified cases, other aging durations and test temperatures can be agreed upon. For aging in diesel fuel, the test fluid acc. to DIN ISO 1817-F (old designation: A20/NP II standard diesel fuel by Haltermann comp.) with a proportion of fatty acid methyl ester of 5 volume percent acc. to DIN EN 14214 shall be used.
6.4.3 Engine oil, transmission oil and grease
96 h aging duration. In justified cases, other aging times and test temperatures can be agreed upon.
6.4.4 Coolant
S3A standard specimens are aged in an autoclave in test fluid consisting of 50 volume parts de-ionized water and 50 volume parts coolant additive acc. to TL 774-D at 135 °C. Test durations are subject to agreement. The fluid volume must be 150 to 180 times the specimen volume. Subsequently the specimens are cooled down to (23 ± 2) °C in the test fluid within 2 hours and measured.
6.4.5 Brake fluid
The specimens are aged in 75 ml brake fluid for 70 h at +120 °C. To do this, tightly closable glass containers with approx. 250 ml volume and 50 mm diameter shall be used. After the test is over, the elastomer parts are conditioned in the container at (23 ± 2)°C for 60 min to 90 min. Subsequently, the specimens are removed from the liquid, rinsed briefly (max. 10 s) in isopropyl alcohol and dried with a clean, fiber-free cloth. The measurements shall be performed within 60 min after the specimens have been rinsed in alcohol.
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7 Referenced standards
The following documents cited in this standard are necessary for application. In this Section, terminological inconsistencies may occur as the original titles are used.
PV 3307 Elastomer Components; Plastic and Elastic Deformability
PV 3935 Plastics and Elastomers; Pyrolytic Gas Chromatography/Mass Spectrometry PV 3936 Polymer Material; Resistance Test to Components of Blow-By Gases
TL 726 Transmission Oil API GL 4 SAE 75W / SAE 80W; Lubricant Requirements
TL 735 Multi-Purpose Grease; Lubricant Requirements
TL 745 Multi-Purpose Low-Temperature Grease; Lubricant Requirements
TL 766 Brake Fluid; Material Requirements
TL 774 Ethylene Glycol-Based Coolant Additive; Material Requirements
TL 1010 Materials for Vehicle Interiors; Flammability, Material Requirements
TL 52185 Reference Engine Oil SAE 5W-30; Testing of Compatibility with Respect to Elastomer Materials; Lubricant Requirements
VW 2.8.1 Elastomers; Material Requirements and Testing
VW 01155 Vehicle Supply Parts; Approval of First Supply and Changes
VW 50180 Components in Passenger Compartment; Emission Behavior
VW 91101 Environmental Standard for Vehicles; Vehicle Parts, Materials, Operating Fluids; Avoidance of Hazardous Substances
DIN 51604-1 FAM Testing Fluid for Polymer Materials; Composition and Requirements
DIN 51604-2 Methanolic FAM Testing Fluid for Polymer Materials; Composition and Requirements
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 53505 Testing of Rubber – Shore A and Shore D Hardness Test
DIN 53508 Testing of Rubber – Accelerated Ageing
DIN 53512 Testing of Rubber – Determination of Rebound Resilience (Schob pendulum) DIN EN 14214 Automotive Fuels; Fatty Acid Methyl Esters (FAME) for Diesel Engines;
Requirements and Test Methods
DIN EN ISO 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 18064 Thermoplastic Elastomers; Nomenclature and Abbreviated Terms
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 ISO 34-1 Rubber, Vulcanized or Thermoplastic – Determination of Tear Strength - Part 1: Trouser, Angle and Crescent Test Pieces
DIN ISO 1817 Rubber, Vulcanized – Determination of the Effect of Liquids