Xu Xinhua rubber seals material performance testing

Xu Xinhua rubber seals according to the general principles of the production of rubber products, the tensile strength must be determined for each batch of feed mix, the elongation at break, tensile permanent deformation, hardness, plasticity, the same drop resistance and other properties. In addition to these basic properties of rubber, rubber shock absorber according to the actual conditions of use, the need to test the following items: a rubber-metal bonding strength, compression set degeneration, brittleness temperature, heat aging resistance, ozone aging resistance, medium Wait.

Xu Xinhua rubber seals rubber shock absorber test finished products including factory inspection and type test.

Xu Xinhua rubber seals factory inspection of all seized means of rubber shock absorbers appearance and dimensions, the rubber surface should be smooth, no bubbles, bumps, cracks and other defects unglued, and sampling programs can be gb2828. Factory inspection project also includes a load deformation characteristics test, static stiffness test, hardness test and adhesion test.

Xu Xinhua rubber seals gb2829 type inspection items can be performed. Type test generally twice a year, the project includes a dynamic vibration test (measuring the natural frequency of the rubber damper a static load curve, dynamic load rating under the elastic stiffness and loss factor under rated load), vibration fatigue, creep resistance, ozone aging test, chemical resistance test, low temperature test.

Common mode vulcanized rubber shock absorbers for vulcanization molding, transfer molding and injection vulcanization vulcanization three. The most common molding vulcanization processes and equipment are relatively simple, heat is transferred from the upper and lower surface of the pressing mold and rubber to metal, this method is particularly suitable for large thick-walled products.

Shift vulcanization molding is the use of press pressure rubber injection mold cavity, forming high efficiency. Rubber by injection hole into the mold cavity. Due to friction, the rubber temperature is increased. Additionally, rubber injection pressure before and after warm-up. Therefore, the shift mode method can shorten the curing time.

    Complex shape rubber damping products pressure injection method can be cured. Since the heating and injection-molded part injection molding machine is an integral part of the pressure, a rubber strip or sheet into the piston, high-pressure injection fully preheated mold cavity. To strictly control the vulcanization curing time and temperature. In general, the degree of crosslinking of rubber increases with time and growth, the rubber modulus increases, the loss factor of rubber is low. Therefore, vulcanized rubber shock absorbers to the full, if less sulfur and persulfate will cause performance degradation products.