How To Adjust The Hardness Of O-Rings

2024-07-09

The hardness of the O-ring sealing ring compound can be adjusted manually to adapt to different equipment and different working environments. In this article,Pulim will introduce you in detail how to increase the hardness of the O-ring sealing ring compound.

Adjust Rubber Formula

The proportion and content of various components in the rubber formula have a significant impact on the hardness of the sealing ring. Increasing the amount of vulcanizing agent can effectively increase the hardness because the vulcanizing agent can form cross-links in the rubber molecular structure. If a plasticizer is added, it will reduce the hardness of the rubber because the plasticizer helps to increase the softness of the rubber. On the other hand, the proportions of ingredients such as fillers, plasticizers, and reinforcing agents can also be adjusted to achieve the required hardness standards.

Use Hardness Modifiers

Hardness modifier is a commonly used substance added to rubber formulations, mainly to increase the hardness of sealing rings. Fillers and cross-linkers are also common hardness modifiers. Fillers such as wollastonite, alumina, etc. can fill the gaps in the rubber and increase the hardness when used. Cross-linking agents such as peroxide, tetramethyl disulfide, etc. can cause cross-linking reactions in rubber, thereby increasing the hardness.

Adjust Vulcanization Process

Vulcanization is an important process for rubber to create a cross-linked structure, which has a great impact on hardness. Adjusting vulcanization process parameters, such as vulcanization temperature, vulcanization time, and the type and amount of vulcanizing agent, can change the hardness of the sealing ring. Higher vulcanization temperature and longer vulcanization time can effectively increase the hardness of rubber.

Mixing Process Controllin

Mixing is the process of mixing various rubber formula raw materials evenly. By adjusting some parameters of the mixing process, such as mixing time, mixing temperature and processing speed, the dispersion, cross-linked structure and hardness of the rubber can be controlled. A reasonable and standardized mixing process can achieve the required hardness index.

When Adjusting The Hardness, You Need To Pay Attention To The Following Points:

Taking other performance requirements into consideration

Hardness adjustment cannot only focus on the improvement of hardness, but also needs to take into account other performance requirements, such as durability, temperature resistance, chemical resistance, etc. Ensure that the adjusted seal can meet the required performance and requirements in the actual application.

Test And Evaluate

When making hardness adjustments, adequate testing and evaluation is recommended. Samples of different formulations are prepared and tested for hardness, physical properties, durability, etc. This will help determine optimal rubber formulations and process parameters.

Work With Professionals

When adjusting the hardness of the O-ring sealant, it is best to cooperate with a rubber product supplier or a professional engineer. They have the experience and expertise to provide accurate advice and guidance to ensure the required hardness targets are achieved.

To sum up, by adjusting the rubber formula, using hardness modifiers, adjusting the vulcanization process, and mixing process control, the hardness of the O-ring sealing ring compound can be increased. When making hardness adjustments, other performance requirements need to be considered and tested, and evaluated. Working with a rubber product supplier or professional engineer will provide valuable advice and guidance. By applying a combination of these methods, you can achieve the desired O-ring compound hardness adjustment to meet specific application needs.

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