Several common sealing material characteristics and applications of flange rubbe

Posted by jj on December 18th, 2020

In the sealing industry, Jiadong tells you that the sealing materials selected for flange gasket include paper, cork, rubber bonded cork and rubber sealing materials (including natural rubber NR, styrene butadiene rubber sealing material SBR, poly Chloroprene CR, nitrile rubber NBR, oxysulfonated polyethylene rubber sealing material CSM, ethylene propylene rubber EP, butyl rubber sealing material HR, fluorine rubber sealing material FPM, polyurethane rubber sealing material AU/EU, silicone rubber material SI wait wait wait.

Flange rubber gaskets are among the more common sealing materials. In terms of versatility and application range, rubber sealing materials are an indispensable part of manufacturing seals. All synthetic rubber sealing materials have a common characteristic, that is, they are obviously deformed under the state of applying stress. When the stress is relieved, the original switch is quickly restored. This is one of the most characteristic of rubber sealing materials. Rubber sealing materials also have many common characteristics.

1. The gasket made of rubber is not compressible. The applied stress only changes the shape, while the volume remains the same.

2. Heating gradually and irreversibly destroys its properties and integrity.

3. Robbery will make it brittle and hard, but this change is reversible.

4. The long-term deformation of the rubber sealing gasket will cause a certain procedure of compression and permanent deformation.

Basic description of some rubber seal materials:

1. Natural rubber (NR) product gasket:

Natural rubber has good mechanical properties, such as good tensile and abrasion resistance, high elasticity and good low temperature flexibility, but because of its low chemical resistance, it has poor resistance to sun and ozone that can cause cracks. , And the operating temperature range is limited. If a gasket is to be made, some restrictions must be met.

2. Sealing gasket of styrene butadiene rubber (SBR) products:

A general-purpose synthetic rubber sealing material that can be used as a general substitute for natural rubber except for occasions requiring certain mechanical properties.

3. Polychloroprene (SR) product sealing gasket:

CR, which is well-known in the sealing industry, is a neoprene sealing material, which is superior to NR and SBR in terms of ozone resistance and climate change resistance. It also has a certain degree of resistance to gasoline, mineral oil and other hydrocarbons. And can be made into flame resistant. This kind of sealing material has only moderate low-temperature flexibility and has the disadvantage of being vulnerable to compression and permanent deformation.