EPDM Rubber Encyclopedia

What indicators should be considered when selecting EPDM recycled rubber for valve seals1

Create Date:2020-03-09 10:15:13Click volume:381
What indicators should be considered when selecting EPDM recycled rubber for valve seals1

EPDM rubber has excellent high and low temperature resistance and ozone resistance. It is used to produce valve rubber seals, which can resist the external environment such as high temperature and ozone, and maintain good sealing performance for a long time. EPDM rubber as a low-cost otherness  raw material for EPDM raw rubber can significantly reduce raw material costs in the production of EPDM rubber products. When using EPDM recycled rubber to replace the original rubber in whole or in part to produce valve seals,reasonable choice  of recycled rubber can achieve a win-win situation of quality and cost.

1. Tensile strength of EPDM recycled rubber

When using EPDM recycled rubber to replace EPDM rubber to produce rubber products, all tensile properties including tensile strength, elongation at break, elongation at break, and permanent deformation at break will affect rubber valve seals. Performance and service life, first of all, according to the specific needs of the seal, choice the EPDM recycled rubber closest to its index.

2. Hardness of EPDM recycled rubber

The hardness directly affects the sealing effect of the valve seal, which indicates the ability of the sealing material to resist the intrusion of external forces. In theory, the higher the hardness of the EPDM recycled rubber, the more beneficial it is to the seal. However, in actual production, excessive hardness will give The production and installation of the valve seal 2LLYY0309 brings difficulties. It is necessary to choice a recycled rubber of suitable hardness according to actual needs, and further adjust the hardness of the valve seal through reinforcement, rubber oil, vulcanizing agent, etc.

3. Compression performance of EPDM recycled rubber

The valve seal is continuously in the compressed state during the working process. The compression performance of the rubber directly affects the sealing effect and durability of the rubber seal. When using EPDM recycled rubber to replace the original rubber to produce rubber valve seals, the compression pressure on the seals will decrease with time, and the compression stress will relax; if the rubber is resistant to compression and permanent deformation cannot meet the compression performance requirements, after removing the pressure The seal cannot return to its original shape, resulting in a weakened sealing effect of the valve seal or a direct loss of sealing performance. Therefore, when using EPDM recycled rubber to reduce the production cost of valve seals, rubber product manufacturers must focus on the compression performance of the rubber material.

When EPDM recycled rubber is used to reduce the production cost of valve seals, rubber product manufacturers can choose to use EPDM recycled rubber alone, or use EPDM and EPDM raw rubber in a suitable ratio. Reduce the cost of raw materials while ensuring quality. In addition to the tensile strength, hardness and compressive properties of EPDM recycled rubber, will other indicators of EPDM rubber affect the service performance and life of valve seals? What problems should we pay attention to when using EPDM recycled rubber to reduce the production cost of valve seals?