Changes The following changes have been made as compared to Test Specification PV 3932: 1996-07:

─ Section 1.2: Requirement according to TL 52345 for elastomer parts added

─ Section 2: Parameters of abrasion chisel for elastomers added

─ Section 3: Dimensions for specimens removed

─ Section 5: Bearing weight of chisel changed; total stroke count for elastomers according to TL 42345 added

Previous issues 1996-07

1 Scope

This Test Specification is used for first-sample tests and for standard production monitoring tests. The test is performed to simulate the flock abrasion while in use and serves to evaluate the quality of the materials used (substrate, plastic, and flock material), the flocking process, and any substrate pretreatment that might be required.

2 Requirements ─ For plastic parts:  See Technical Supply Specification TL 52447 or drawing ─ For elastomer parts See TL 52345

3 Test equipment

Abrasion tester: APG 1000 made by Maag Flockmaschinen or similar device Abrasion chisel: Width 20 mm, radius R = 0,50 mm, hardened steel (for plastics)  Width 2,8 mm, radius R = 0,16 mm, hardened steel (for elastomers)

4 Specimens

The specimens are prepared from finished parts.

5 Specimen pretreatment

The specimens must be aged for a minimum of 24 h in the DIN 50014-23/50-2 standard climate.

6 Procedure

The specimen is securely clamped in a clamping bar on a sled. The abrasion chisel is then attached and loaded with a weight. The bearing weight of the chisel on the specimen surface is 750 g per cm of chisel width. The edge of the chisel must be guided parallel to the specimen surface. The sled velocity is set such that 60 double strokes/min are produced. The required total stroke count for plastic parts is 500 double strokes. For elastomer parts, see TL 52345.

7 Evaluation

The specimen is evaluated in good lighting before and after loading. Any visible changes are detected. The following evaluation system is used for differentiation purposes: Grade 0 No visible change in the surface Grade 1 Visible chisel traces, but no flock abrasion Grade 2 Distinctly visible chisel traces, minor flock abrasion Grade 3 Flock abrasion, but no visible adhesive Grade 4 Flock abrasion, and visible adhesive Grade 5 Abrasion down to the substrate

8 Deviations

The dimensions of the specimens must be agreed and specified in the test reports or test certificates.

9 Referenced documents1

TL 52345 EPDM Body Seals; Quality Requirements TL 52447 Flocking of Interior Trim Material; Material Requirements DIN 50014 Climates and Their Technical Application; Standard Atmospheres