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Why are sealing rings mostly made of silicone rubber materials rather than TPE?

Release time:2026-07-14

With the continuous improvement of technological levels, in recent years, more and more electronic products have begun to support waterproof functions, which has raised higher requirements for the sealing performance of the products. I wonder if anyone has noticed a strange phenomenon? Both elastomers such as rubber and TPE materials are used, but TPE materials are rarely used to make sealing rings, while silicone rubber materials are more commonly used? Today, Yongyong Silicone Rubber Products will come to tell you the mystery behind this!

橡胶密封圈 (2)

  One of the very important reasons for this is that silicone rubber materials have excellent rebound properties. Some of these materials can still maintain good physical properties at temperatures ranging from 200 to 280 degrees Celsius. Additionally, rubber materials such as EPDM rubber materials have excellent airtightness and anti-aging properties, and have been widely used in the automotive sealing field. Secondly, rubber materials can be selected based on the specific usage environment of the product, such as NBR materials that are resistant to oil (gasoline, hydraulic oil, etc.), and fluorine rubber materials that are resistant to high temperatures. These advantages are beyond what other plastic materials like TPE/TPU can offer.

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  Here, I would like to introduce it through an example of one of our company's clients. There is a newly developed fuel cell project at Shenzhen Lier Technology Co., Ltd. Initially, the ABS + TPE secondary molding method was used. A layer of TPE material was wrapped on the plastic shell to achieve fuel sealing. However, during the final assembly and testing, leakage occurred. After the client conducted multiple analyses, they found that it was very likely a material issue. Finally, they came to us. After understanding the client's problem, we designed and adopted an EPDM rubber material rubber sealing ring product for them, and the experiment was successful at the first attempt. It received unanimous praise from the client.

汽车冷凝器密封圈

  Of course, for any material, there are its own advantages and disadvantages. By leveraging its own advantages, it plays an irreplaceable role in its respective field. Yong Yong Silicone Rubber has been dedicated to silicone rubber products for 25 years. It provides an overall solution from material research, mold development, to silicone rubber product manufacturing. Welcome to visit and inspect our factory. Contact number: 0769-85536776 / Miss Luo. Website: www.seidai88.com.

东莞长安涌永硅橡胶制品有限公司


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