QC/T 1029-2016Polypropylene (PP) honeycomb board products for automobiles (English PDF)

3.1 Substrate

double or triple layer polypropylene cellular board product without composite fabric

3.2 The composite sheet

polypropylene cellular board product that decorative fabric is combined with the substrate

6.6.1 Sample

Take 5 pieces of 120mm × 10mm samples on the product. The sample thickness is the part thickness.

6.6.2 Test equipment

Tensile machine with a precision of level one.

6.6.3 Test steps

Accurately measure the width and thickness of the specimen with a caliper with an accuracy of 0.02 mm or more. Test according to the provisions of GB/T 9341- 2008. The indenter radius is 5 mm, the span is 16 times the thickness of the sample, and the test speed is (2.0 ± 0.4) mm/min. Double-layer polypropylene cellular board head presses on the flat side.

6.7 Resistance to coldness and heat

6.7.1 Sample

3 pieces of products.

6.7.2 Test equipment

Thermostatic oven, low temperature box, humidity box or high and low temperature humid heat box; temperature accuracy is controlled at ±2°C, humidity accuracy is controlled at ±5%.

6.7.3 Test steps

Perform 4 cycles of tests when product in under assembly state, of which (80 ± 2 )°C/3 h -> RT/1 h -> (-40 ± 2)°C/3 h -> RT/1 h -> ( 55 ± 2 )°C, 95%RH/15 h -> RT/1 h is one cycle (RT refers to room temperature). Observe the appearance change after the test.

6.8 Heat aging resistance

6.8.1 Sample

3 pieces of products.

6.8.2 Test equipment

Thermostatic oven, temperature accuracy is controlled at ±2°C.

6.8.3 Test steps

Take 3 pieces of products. Accurately measure the main assembly size or outer […]

6.12.1 Test equipment

Tensile machine, the accuracy is one level; thermostatic oven, low temperature chamber, humidity chamber, temperature accuracy is controlled at ±2°C, and the temperature accuracy is controlled at ±5%.

6.12.3 Test conditions

a) Delivery state.

b) Resistance to coldness and heat. perform 4 cycles of tests, of which (80 ± 2 )°C/3 h -> RT/1 h -> (-40 ± 2)°C/3 h -> RT/1 h -> ( 55 ± 2 )°C, 95%RH/15 h -> RT/1 h is one cycle;

c) Heat resistance. (80 ± 2)°C/168h;

d) Coldness resistance. (-40 ± 2)°C/24h.

6.12.4 Test steps

Place the sample treated according to the above test conditions at room temperature for 2 h. After the decorative fabric is peeled off from the substrate, one end of the substrate is clamped on the clamp on the tensile machine, and one end of the decorative fabric is clamped on the clamp under the tension machine. Perform the 180° peel test with professional fixture at (100 ± 10) mm/min. Measure the maximum load at the time of peeling and record the 50- mm wide sample peel force. Take the average value of the results of the five samples as the test result, in one after the decimal point.

7.1 Testing frequency and project

The testing of cellular board product shall determine the inspection frequency and project according to quality control requirements.

7.2 Re-inspection

When one of the following conditions occurs, it shall be fully tested in accordance with this Standard.

a) continuous production for more than half a year;

b) technique conditions change; […]

A.1 Test devices, test conditions

A.1.1 Sample

The sample shall be prepared as much as possible in a considerable area or volume. A 50 cm² sample shall be cut from the part.

A.1.2 Test devices

Electric blast drying oven, temperature accuracy is controlled at ±2°C. Use glass closed container with a volume of 1 L. The container must be cleaned and dried before each test to ensure that the container is clean and tasteless. It is recommended to use a glass container with a screw cap.

A.1.3 Test conditions

Method A. (40 ± 2)°C, add 50 mL of distilled water to the container, store (24 ± 1) h, support the sample with a metal bracket to ensure that the sample does not touch the water.

Method B. (80 ± 2)°C, store (2 ± 0.1) h.

NOTE. Method B is a rapid test method. Under normal circumstances, the odor at 80°C is greater than the odor at 40°C. If the part is considered to be in a warm condition, no toxic or odor shall occur, then the test of Method A may not be performed.

A.2 Test steps

Place the cut sample into a closed container and test it according to Method A and Method B specified in A.1.3. After taking out, the smell shall be evaluated as follows. The evaluation environment shall meet the requirements of GB/T 2918-1998.

For Method A. after the test container is taken out of the dry box, the first full-time inspector opens the lid 30° ~ 45° on one side and sniffs the lid quickly to ensure that the container is closed, then passes the container to the second full-time inspector; the second full-time inspector shall pass the container to the third full-time inspector for assessment. Each full-time inspector shall give an evaluation score immediately after the smell.