Sealing generally involves at least 3 parts, one sealing part and two to be sealed parts. The sealed surface of the sealed part seems to have a smooth surface, but in a microscopic view, its surface is uneven. If there is no seal, it can be imagined that when the two sealed parts are attached together, there are actually many small gas or liquid channels on the attaching surface, which leads to leakage.

For example, if the surface roughness of the sealing surface is 3.2, such a surface is smooth enough to be touched by hand, but the surface is still uneven from a microscopic point of view (in simple terms, it is 3.2 microns. For details, you can search the surface on the Internet. The meaning of roughness). The rubber seal is to isolate these uneven microstructures. In this way, gas or liquid will not pass through the sealing surface, that is to say, it can play a sealing role.

In fact, not only rubber but also plastic and metal can be sealed. Rubber is often used in low-pressure environments and medium-to-high-availability plastics such as PTFE (a type of plastic). Copper and other metals can be used to seal the place of ultra-high pressure.

Rubber Screw Spacers

• Spacer refers to the part between the connection piece and the nut. Generally, it is a flat ring for protecting the surface of the connected member from the nut and the pressure of the dispersing nut against the connected member.

  
  

• It's generally used in the joints. One is soft and the other is hard and brittle. Its main function is to increase the contact area, disperse the pressure, and prevent the soft texture from being crushed.

  
  

• Rubber screw spacers are usually made of NBR, SBR, HNBR, EPDM, SILICONE, VITON, CR, FFKM, etc.