Development of Nitrile Rubber O-rings
 Sep 16, 2020|View:250

With the development of modern industry, all parts of mechanical equipment need to have high standards and high quality. In particular, the use of rubber sealing parts is more important, and the conditions of selecting rubber seal in the industry are higher and higher.

1) First of all, the composition and properties of the medium are selected, which is the main condition to determine the rubber type, because only by selecting the rubber type which is relatively stable to the medium, can the rubber parts be used in the medium for a long time.

2) Select the temperature, including the minimum temperature and the maximum temperature, because the selected rubber-type should be within the specified temperature range

Ensure normal operation, otherwise, rubber parts will produce thermal decomposition or cold hardening and embrittlement at the corresponding temperature. Loss of rubber elasticity, sealing reliability can not be guaranteed;

3) The selection of working pressure includes general pressure and limit pressure. When the reliable sealing under the corresponding pressure is ensured, the product should have a certain strength and hardness to solve the sealing problem smoothly

4) The selection of working conditions, including static seal and dynamic seal (reciprocating motion, rotary motion, compound motion, etc.) will determine the structure and shape of sealing parts and the processing and matching relationship of related metal parts, so as to meet the requirements of motion forms and make rubber sealing parts have a higher working life.

Nitrile rubber O-rings

Nitrile rubber O-rings have some difficulties in the rubber manufacturing industry. First of all, it is required to have high accuracy, uniform thickness, safe process, good tear resistance, small compression permanent deformation, high sealing degree, and tight gap. Therefore, according to the properties of various rubbers, NBR has the above characteristics.

Nitrile rubber o-rings (NBR) is a representative oil resistant synthetic rubber. After industrial production in Germany in 1937, it has developed rapidly. Up to now, there are more than 200 brands in China. From the beginning to the present, the product development mainly tends to low-temperature polymerized nitrile rubber o-rings, soft nitrile rubber o-rings with good processing performance, and modified nitrile rubber o-rings. NBR is widely used in seals, rubber rolls, and miscellaneous products, which accounts for the largest proportion of seals. For example, the sealing gasket used for direct contact with oil, oil pipeline, chemical lining, oil-resistant transport belt, oil storage tank, and other aspects, has a great development prospect.

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