GB/T 21282-2007Rubber/Plastics weatherstrip for automobile (English PDF)

3.1 Dimensions and tolerances

The cross-section shapes, dimensions and tolerances of products, and the lengths and tolerances of products shall be as required by design drawings; if it is not explicitly specified in drawings, the supplier and the purchaser shall choose and use in accordance with the classes specified in GB/T 3672.1.

3.2 Appearance quality

The appearance quality of weatherstrips shall be as specified.

3.3 Performance requirements for materials

The matrix materials of weatherstrips can be based on EPDM, PVC and TPE, whose performance requirements shall be as specified in Tables 1 ~ 4.The performance requirements for other matrix materials shall be as agreed by the supplier and the purchaser.

4.1 Measurement of dimensions

4.2 Appearance measurement

Use the visual inspection method for examination.

4.3 Material performance test methods

4.3.1 The determination of the hardness of rubber materials shall be carried out using the method specified in GB/T 531-1999; the determination of the hardness of plastic and TPE materials shall be carried out using the method specified in GB/T 2411-1980(1989).

4.4 Performance test methods of finished products

4.4.1 Quantity of test specimens

Unless specified otherwise, three test specimens shall be cut out from different finished products which shall be of the length required by the test.

4.4.2 Corner binding force (joint breaking tenacity) test

4.4.3 The test of the wear resistance shall be carried out using the method specified in Annex B.

5.1 Inspection classification

5.1.1 The inspection of weatherstrips include exit-factory inspection and type inspection. For the detailed inspection items see Table 10.

5.2 Batching, sampling plans and criteria

5.2.1 Batching

The basal materials and finished products of weatherstrips shall be subjected to inspection by batch. Materials of the same type and the same production lot constitute a batch of basal materials.

5.2.2 Sampling plans and criteria

5.2.2.2.2 In normal production, the appearance quality, sectional shapes and dimensions and product length shall be subjected to inspection by batch; if it is a fail, then the batch of products is rejected.

5.2.2.2.3 The corner binding force (joint breaking tenacity), compression load, insertion force and pullout force of finished products shall be subjected to inspection by batch; the wear resistance shall be subjected to inspection once a month;

5.2.2.1 Exit-factory inspection

6.1 Marking

6.1.1 The marking content on finished products shall be as required by the user.

6.1.2 Product certificate

Each independent package shall be provided with a certificate of conformity, indicating product name, product logo, trademark, manufacturer name and address, manufacture date, standard number and inspector signature. […]