It is well known that car engines are the most important parts of cars, but do you know the importance of choosing silicone tubes for car maintenance?A few days ago, my friend told me that his car engine was suddenly scrapped just because of the wrong choice of a silicone hose.
When he asked the car repair shop about the cause of the car breakdown.The clerk told him that everything was because he chose a poor quality silicone heat pipe.This pipe has poor wear resistance and leaks during use.The coolant flow from the broken hole of the pipe.Then The coolant in the water tank is lost.The heat of the car engine cannot be taken away by the coolant.The car engine is damaged and the cylinder is unable to work.
3.1 Auto siliocne hose product structure
A rubber hose consisting of four or five layers of reinforced fabric and silicone rubber. The reinforcing material of the fabric layer is polyester fiber. The inner and outer surfaces of the fiber cloth are completely impregnated with silicone rubber complex, and the layers are evenly distributed.
The hose is not allowed to have bubbles, cracks, local bumps and other defects:
3.3 Physical and mechanical properties of rubber
The physical and mechanical properties of the compound shall comply with the provisions of Table 1.
3.4 Hose performance
3.4.1 Product hardness: at 23±2℃ Shore A hardness of 60±5 degrees.
3.4.2 Burst pressure: The product must be able to withstand 1.2mpa burst pressure.
3.4.3 High temperature performance: After being placed at 250℃ for 168h, there shall be no cracks or fractures on the inner and outer surfaces. The hardness of Shaw A shall not be greater than 70 degrees. After being placed at 300℃ for 168h, there shall be no cracks or fractures on the inner and outer surfaces.
3.4.4 Low temperature elasticity: Place at a temperature of 55℃ for 4h, rapidly compress to 50% along the radial direction, and no cracks or fractures should occur on the inner and outer surfaces.
3.4.5 Inter-layer bonding: When pulled apart at a rate of 50mm/min, the bonding force of inner and outer layers shall be greater than or equal to 1.75kN /m.
3.4.6 Ozone resistance: Placed in an ozone atmosphere with a concentration of 50 µm and a temperature of 40℃ for 70h, no obvious cracks can be seen on the surface when observed with a double magnifying glass.
3.4.7 Compression performance: After high temperature test, the hose should be compressed to 50% along the radial direction at a rate of 50mm/min, and there should be no cracks or fractures on the inner and outer surfaces.