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How to adjust the hardness of the rubber material?

2025-04-27

Raw rubber system
1) The combination of rubber and plastic is also a common method, and the use of high styrene and PVC/NBR alloy can also increase hardness.
2) Changing the type and grade of adhesive can also increase hardness (less commonly used)

Sulfurization promotion system
1) By adding vulcanizing agents to increase chain density and hardness, such as significantly increasing the amount of sulfur used, the hardness of rubber products can be improved to a certain extent when other materials remain unchanged in the production of recycled rubber products. (100 parts of glue, with a maximum sulfur dosage of 4-5 parts)
2) Add resin. Adding resin to the production of recycled rubber products can increase their hardness.
3) Some products undergo secondary vulcanization to increase cross-linking and hardness.

Reinforcement filling system
1) Add carbon black. Carbon black can be used as a filler in rubber mixtures to change the hardness of rubber products.
2) Changing the type of carbon black can significantly increase its hardness while maintaining the same rubber content.
3) Adding adhesive powder increases hardness and has a very good effect, but it is only suitable for molded products. Fourthly, the plasticizing softening system reduces the amount of rubber oil used. Rubber oil has a softening effect and expands when added to rubber products, reducing the interaction force between polymers. Reducing the amount of rubber oil is equivalent to reducing the softening effect of rubber products and improving their hardness.

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