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Thermal extension device
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1. Test standard
It conforms to the GB/T2951-2008 standard and other clauses GB5013-2008 that require the device, and needs to be used in conjunction with the 401 aging test chamber.
1. Weights: 1, 2, 5, 10, 20, 50g, 100g
2. 150mm stainless steel ruler
3. Material: stainless steel
4. Weight: about 2kg
Sample preparation and measurement of cross-sectional area Cut two insulation samples and sheath samples from each sample to be tested, prepare the sample and measure the cross-sectional area according to the test method specified in Chapter 9 of GB/T2951.1 experimenting.
The dumbbell test piece shall be made from the inner layer of the insulation and sheath after removing all ridges and or semi-conductive layers.
The thickness of the test piece shall be no less than 0.8mm and no more than 2.0mm. If a 0.8mm thick test piece cannot be prepared, the minimum thickness is allowed to be 0.6mm.
3. Test equipment
a) The test should be carried out in an oven as specified in Article 8.1 of GB/T2951.2-1997. The test temperature is in accordance with the relevant material specifications in the relevant cable product standards.
b) In the oven, each test piece should be hung from the upper chuck, clamped by the lower chuck, and weighted on the lower chuck.
Note: When fixing the tubular test piece with the chuck, the two ends of the test piece should not be tightly closed. It can be achieved by appropriate methods, such as inserting a small piece of metal needle tube into one end of the test piece, the size of which is slightly smaller than the inner diameter of the test piece.
Four, test steps
a) The test piece should be hung in the oven, and the lower chuck should add weight. The resulting force is in accordance with the relevant cable product standards for related materials.
b) After 15 minutes in the oven, measure the distance between the marking lines and calculate the elongation. If the oven has no observation window and the door must be opened for measurement, the measurement should be completed within 30s after opening the door. The temperature of the oven is in accordance with the regulations of the relevant cable product standards for the relevant materials. In case of dispute, the test should be carried out in an oven with an observation window, and the door of the oven should not be opened for measurement.
c) Then release the tension from the specimen (cut the specimen at the lower chuck), and restore the specimen at the specified temperature for 5 minutes. Then take the test piece out of the oven, slowly cool it to room temperature, and measure the distance between the marking lines again.
5. Evaluation of test results
After 15 minutes of load at the specified temperature, the median value of elongation should not be greater than the relevant cable product standards.
The median value of the increase in the distance between the marked lines after the test piece is taken out of the oven and cooled to the percentage of the distance before the test piece is placed in the oven should not be greater than the relevant cable product standard.
We could not find any corresponding parameters, please add them to the properties table
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