What is the hardness test method for the Automotive Wiring Harness Protection Sleeve?

The Automotive Wiring Harness Protection Sleeve production industry often hears a word hardness. For the Automotive Wiring Harness Protection Sleeve, the hardness is a physical measure of the degree of compression deformation of the Automotive Wiring Harness Protection Sleeve after molding. Automotive wiring harness protective sleeves generally adopt the Shore hardness test method, that is, press the hardness tester against the surface of the tested Automotive Wiring Harness Protection Sleeve in a vertical direction, and read the data after the pointer on the surface of the hardness tester stops. The unit is degree. The description method is divided into two types, A and D, respectively representing different hardness ranges. The A hardness tester is used to test and obtain data below 90°, while the D hardness tester is used to test and obtain data for 90° and above.

Therefore, generally when testing rubber or plastic products, testers can make predictions before testing based on experience, so as to decide whether to use Shore A hardness tester or Shore D hardness tester for testing. Generally, the tester can directly judge the product with relatively elastic or soft hand feeling with the Shore A hardness tester, and the Shore D hardness tester for the product with basically no elasticity or hard hand feeling. Generally, A hardness tester will be used for the Automotive Wiring Harness Protection Sleeve (HTV). The following editor will introduce the hardness test method of the Automotive Wiring Harness Protection Sleeve (HTV) in detail.
1. Before testing the hardness, it is necessary to manufacture a piece of test product, also called hardness grain. The size of the hardness grain is required to be 30×30×7mm, the surface is required to be flat, and the surface to be tested is required to be horizontal when placed on the test platform. In order to prevent test errors, it is best to manufacture a set of hardness grain forming molds according to this specification for forming hardness grains.
2. The Cable Sleeve used to make hard grains should be fully mixed and even. The amount of vulcanizing agent added must be strictly in accordance with the instructions of the vulcanizing agent. Too much or too little will affect the hardness of the Cable Sleeve after molding.
3. The molding conditions of hardness grains, take the hardness grain mold of 50T flat vulcanizing machine + 150×150mm template as an example: the measured upper and lower mold temperature: 165±5℃, pressure: 50kg/cm2, vulcanization time: 300S.