QC/T 716-2004Test methods for retention force and insertion force of automotive weatherstrips (English PDF)

1 Scope

This Standard specifies the retention strength and insertion resistance test method for automobile weatherstrips.

This Standard applies to the test of the retention strength and insertion resistance for automobile weatherstrips.

2 Normative references

The terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this Standard.

However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard.

GB/T 2941, Standard temperature, humidity and time for environmental regulation and testing of rubber samples (eqv ISO471:1983)

HG/T 2369, Rubber and plastic tensile testing machine technical conditions

GB/T 8170, Rules of rounding off of numerical values

3 Instruments and apparatuses

4 Sample and state adjustment

4.1 In routine tests, three samples shall be taken from different finished or semi-finished products. If there is no special regulation, the length of the sample shall be (120 ± 2) mm; the part that interferes with the test other than the clamping portion in the sealing strip shall be removed.

4.2 The time interval between the test and the production of the product AND the adjustment of the sample before the test shall be carried out in accordance with the provisions of GB/T 2941.

4.3 If it is not specified in the product technical documents, the sample, before the test, shall be parked for at least 3 hours under the environment where the temperature is (23±2) °C and the relative humidity is (50±5) %. The sample shall not be pressurized and deformed during the parking period.

5 Test steps

6 Test result expression

6.1 The calculation result is rounded to 1% according to GB/T 8170.

6.2 For the insertion force test, take the maximum value of the three samples as the test result: for the extraction force test, take the minimum value of the three samples as the test result. The unit is expressed in Newtons (N).

7 Test report

The test report shall contain the following contents:

a) test name, number:

b) number of this Standard;

c) sample length;

d) painted board thickness:

e) the measured value and average value of each sample;

f) test conditions: test temperature, time, speed and other relevant parameters;

g) test result;

h) type of instruments and apparatuses in the test:

i) tester and date. […]