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TL 52288

Group standard

Issue 2015-02 Class. No.:

55129

Descriptors:

finished part, mineral-reinforced, polyamide, PA6, PA66, PA6.6, wheel trim, injection molding

Polyamide, Mineral-Reinforced, Finished Parts Materials Requirements Previous issues TL 52288: 1984-10, 1987-02, 1987-06, 1996-09, 2005-04 Changes The following changes have been made to TL 52288: 2005-04: – Standard changed to new layout – Applicable documents updated – Table 1: "Flammability" and "D" (mandatory documentation) deleted 1

Scope

This Technical Supply Specification (TL) specifies the materials requirements for mineral-rein‐ forced polyamide, e.g., for wheel trims. 2

Description

3

Requirements

3.1

Basic requirements

QUELLE: NOLIS

Polyamide, mineral-reinforced as per TL 52288

Approval of first supply and changes as per Volkswagen standard VW 01155 Avoidance of hazardous substances as per VW 91101.

Always use 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 case of discrepancies, the German version is alone authoritative and controlling.

Technical responsibility

Page 1 of 6

The Standards department

GQL-P/1

Angela Kern

Tel.: +49 5361 9 28507

GQL-P/1

Dr. Claudia Kühlmeyer-Freise

Tel.: +49 5361 9 26163

GQL-P

Dr. Jiping Liu

EKDV/4 Stefanie Reiss

EKDV

Tel.: +49 5361 9 41184

Maik Gummert

All rights reserved. No part of this document may be provided to third parties or reproduced without the prior consent of one of the Volkswagen Group’s Standards departments.

© Volkswagen Aktiengesellschaft

VWNORM-2015-07d

Page 2 TL 52288: 2015-02

Eight finished parts are required for complete testing. 3.2

Appearance

The surface and interior of the finished parts must be free of flaws and processing defects such as flow lines, cracks, voids, or similar defects. The surface must be smooth, free of release agent, and capable of being coated using a state-of-the-art process. Marking of sink marks especially in the area of rib joints and stiffenings as per the released boun‐ dary sample. 3.3

Manufacture

Injection molding 3.4

Conditioning

Before testing, the specimens must be conditioned in the ISO 554-23/50 standard atmosphere for at least 48 h. 3.5

Evaluation of the measurement results

The required numerical values apply to each individual measurement. 3.6

Material

See section 5.1. Polyamide 66, alternatively polyamide 6 or copolymer of PA6 and PA66 with inorganic fillers con‐ sisting primarily of aluminum silicate or calcium silicate. Added glass fiber and/or modifiers to increase impact strength are permissible. 4

Properties

See table 1. Table 1 No.

Property

Unit

Requirement

1

Ignition residue as per DIN EN ISO 1172, method A see section 5.2

%

(15 ±2) to (30 ±3) unless specified otherwise in the drawing.

2

Moisture content see section 5.2 Drying until weight stability is reached at 110+5 -0 °C

%

0.8 to 1.3 unless specified otherwise in the drawing.

3

Density as per DIN EN ISO 1183-1, method A see section 5.2

g/cm3

(1.230 ±0.015) to (1.360 ±0.015) depending on substrate and unless specified otherwise in the drawing.

Page 3 TL 52288: 2015-02

No.

Property

Unit

4

Requirement

Ball indentation hardness in moist condi‐ tion see section 5.3

N/mm

2

See drawing.

5

Flexural strength in moist condition see section 5.4

N/mm2

See drawing.

6

Impact strength in dry condition see section 5.5

kJ/m2

See drawing.

7

Notched impact strength in dry condition see section 5.6

kJ/m2

See drawing.

8

Elevated-temperature behavior see section 5.7

No visible shape change.

9

Behavior in humid heat see section 5.8

No visible shape change, no in‐ creased showing of sink marks.

10

Low-temperature behavior see section 5.9

No fracture.

11

Lightfastness and weather resistance (short-term tests, requirements apply only to unpain‐ ted parts on the vehicle exterior or if specified in the drawing)

11.1

Weathering in humid heat (Florida) as per Test Specification PV 3930 Test duration: 1-year cycle

No visible changes from the as-re‐ ceived condition, e.g., color changes, chalking, and/or cracking. Gray-scale level 5 as per DIN EN 20105-A02

11.2

Weathering in dry heat (Kalahari and Ari‐ zona) as per PV 3929 Test duration: 1-year cycle

No visible changes from the as-re‐ ceived condition, e.g., color changes, chalking, and/or cracking. Gray-scale level 5 as per DIN EN 20105-A02

12

Weather resistance in nature (open-air weathering)

12.1

Weathering in humid heat (Florida) as per DIN EN ISO 2810 Test duration: 24-month cycle

No visible changes from the as-re‐ ceived condition, e.g., color changes, chalking, and/or cracking. Gray-scale level 5 as per DIN EN 20105-A02

12.2

Weathering in dry heat (Kalahari and Ari‐ zona) as per DIN EN ISO 2810 Test duration: 24-month cycle

No visible changes from the as-re‐ ceived condition, e.g., color changes, chalking, and/or cracking. Gray-scale level 5 as per DIN EN 20105-A02

5

Notes on testing

5.1

Material

The polymer identity is tested by infrared spectroscopy, the filler identity by X-ray fluorescence analysis.

Page 4 TL 52288: 2015-02

5.2

Specimens

For painted finished parts, the paint finish does not need to be removed from the specimen surface before measuring. 5.3

Ball indentation hardness

For painted finished parts, the paint finish of specimens for the indentation test must be removed using a surface grinding machine. The measurement must be performed as per DIN EN ISO 2039-1 after aging the specimens for 48 h at (55 ±1) °C and 100% relative humidity and cooling the specimens to (23 ±2) °C. 5.4

Flexural strength

The flexural stress must be determined at maximum load as per DIN EN ISO 178. Specimen (sampled in the flow direction of Length (50 ±1) mm the injection-molding material): Width (6 ±0.2) mm Thickness corresponding to product thickness (max. 4 mm) Test speed: 14 mm/min Distance between supports: 40 mm Support radius: 1.0 mm to 1.2 mm The measurement is performed after aging the specimens for 48 h at (55 ±1) °C and 100% relative humidity and subsequent cooling of the specimens to (23 ±2) °C. Specimens taken from molded parts with one-sided paint finish and/or grain must be placed on the test machine supports so that the painted and/or grained side faces the loading edge. 5.5

Impact strength

Impact strength as per DIN EN ISO 179-1/1fU; pendulum impact tester 4 J as per DIN 51222. Specimen dimensions: Distance between supports: Depending on component geometry, specimens of the following sizes may also be used: Deviating support separation:

80 mm × 15 mm × product thickness (mm) 62 mm 50 mm × 6 mm × product thickness (mm)

40 mm

The measurement is performed after vacuum aging the specimens for 72 h at (100 ±2) °C and subsequent cooling of the specimens to (23 ±2) °C in a desiccator. Specimens taken from molded parts with one-sided paint finish and/or grain must be placed on the support brackets of the pendu‐ lum impact tester so that the painted and/or grained side faces the hammer edge. 5.6

Notched impact strength

Impact strength test as per DIN EN ISO 179-1/1eA; pendulum impact tester 4 J as per DIN 51222. Specimen dimensions: Deviating support separation:

50 mm × 6 mm × product thickness (mm) 40 mm

Page 5 TL 52288: 2015-02

Specimens taken from molded parts with one-sided paint finish and/or grain must be notched on the painted and/or grained side. The notch depth is 1/3 of the specimen thickness. The measure‐ ment is performed after vacuum aging the specimens for 72 h at (100 ±2) °C and subsequent cool‐ ing of the specimens to (23 ±2) °C in a desiccator. 5.7

Elevated-temperature behavior

Heat aging test as per DIN 53497, method B. Aging period:

22+2 -0 h

Aging temperature:

(130 ±2) °C

5.8

Behavior in humid heat

Aging period:

44+4 -0 h

Aging temperature: Relative humidity:

(55 ±1) °C 95+5 -0 %

The evaluation is conducted visually after cooling the specimens to (23 ±2) °C. 5.9

Low-temperature behavior

Ball drop test as per PV 3905. Aging period:

44+4 -0 h

Aging temperature: Ball drop height: Ball impact point:

(-30 ±1) °C (450 ±10) mm Visible side

6

Applicable documents

The following documents cited in this standard are necessary to its application. Some of the cited documents are translations from the German original. The translations of Ger‐ man terms in such documents may differ from those used in this standard, resulting in terminologi‐ cal inconsistency. Standards whose titles are given in German may be available only in German. Editions in other languages may be available from the institution issuing the standard. PV 3905

Organic Materials; Ball Drop Test

PV 3929

Non-Metallic Materials; Weathering in Dry, Hot Climate

PV 3930

Non-Metallic Materials; Weathering in Moist, Hot Climate

VW 01155

Vehicle Parts; Approval of First Supply and Changes

VW 91101

Environmental Standard for Vehicles; Vehicle Parts, Materials, Operat‐ ing Fluids; Avoidance of Hazardous Substances

DIN 51222

Materials testing machines - Impact test - Particular requirements on pendulum impact testing machines with a capacity of nominal energy