1. Appearance quality
The appearance quality of the rubber sheet is one of the primary criteria for judging, and the following points are mainly considered:
1. The surface of the rubber sheet should be flat and smooth, without defects such as cracks and bubbles;
2. The edges and corners should be neat and straight, and there should be no broken edges or burrs;
3. The color of the rubber sheet should be uniform, and there should not be too much color difference.
2. Hardness and strength quality
The hardness and strength of the rubber sheet are important indicators for judging its quality. The greater the hardness and strength, the greater the bearing capacity of the rubber sheet during use, and the better the durability.
1. Hardness: Hardness refers to the index of resistance and deformation resistance of the rubber sheet. Generally, the hardness of the rubber sheet is expressed by "Shore A". The larger the index, the greater the hardness of the rubber sheet, but it is not required that the greater the hardness, the better. Choose the appropriate hardness according to the needs. For example, in some gasket applications, the hardness is required to be softer to obtain a better sealing effect.
2. Strength: Strength refers to the ability of the rubber sheet to be durable. The higher the strength, the longer the service life of the rubber sheet. Strength is not only related to the material of the rubber sheet itself, but also to factors such as the use temperature and environment. Generally, the tensile strength of the rubber sheet is required to be above 8MPa and the elongation at break is required to be above 300% to ensure service life and safety.
3. Wear resistance quality
Rubber sheets are prone to wear during long-term use. Wear resistance quality refers to the ability of rubber sheets to resist wear. If the wear resistance of the rubber sheet is poor, the service life will be shortened. In general applications, the wear resistance index is required to be 6mm³ and below.
Judging the quality of the rubber sheet requires consideration of many factors such as appearance quality, hardness and strength, and wear resistance. These factors are interrelated and determine the use effect and safety of the rubber sheet. When purchasing, you should carefully check and choose a rubber sheet of the required quality and model.