What is Solid Silicone HTV


What is Solid Silicone HTV?

Solid Silicone HTV, or High-Temperature Vulcanization, is a type of silicone rubber that undergoes a vulcanization process at elevated temperatures. As the name suggests, it solidifies and takes a fixed shape when exposed to heat. It is commonly used in the production of elastic and high-temperature-resistant products such as seals, gaskets, and electrical wire insulation.
During the manufacturing process of solid silicone HTV, the silicone is heated to high temperatures, and a vulcanizing agent is added to initiate the vulcanization reaction. This reaction results in the formation of a flexible and heat-resistant silicone structure. The material is well-suited for various specialized environments and applications.
Solid silicone HTV is chosen for applications that require resistance to high temperatures, excellent elasticity, and good insulation properties. The vulcanization process enhances the material's elasticity and heat resistance by creating cross-linked structures between silicone molecules. This makes HTV suitable for the production of products that need to withstand elevated temperatures while maintaining flexibility and insulation performance.

Comparison of Solid Silicone HTV and Liquid Silicone

Solid Silicone HTV and Liquid Silicone exhibit significant differences in their properties and applications. Here is a comparison between them:

Physical State

Solid Silicone HTV: At room temperature, it is in a solid state and requires vulcanization at high temperatures to form a flexible and heat-resistant silicone.
Liquid Silicone: At room temperature, it is in a liquid state and can rapidly solidify without the need for high-temperature vulcanization.

Processing and Hardness

Solid Silicone HTV: The processing involves high-temperature vulcanization, resulting in higher hardness. It is typically used for applications requiring flexibility and high-temperature resistance.
Liquid Silicone: The processing is relatively simple, and it has lower hardness. It is widely used in applications that require flexibility and deformation.

Application Areas

Solid Silicone HTV: Commonly used in the manufacturing of products for high-temperature environments, such as electrical wire insulation and automotive components.
Liquid Silicone: Often used in applications that require flexibility and high surface tension, such as the production of seals and molding.

Curing Time

Solid Silicone HTV: Has a longer curing time because it involves vulcanization reactions, making the process relatively time-consuming.
Liquid Silicone: Can solidify rapidly at room temperature, resulting in a shorter curing time.

Molding Process of Solid Silicone HTV

The molding process of solid silicone HTV primarily involves the following steps:

Raw Material Preparation

Prepare the raw materials for solid silicone HTV, including the main silicone components and vulcanizing agents.


The raw materials typically undergo a mixing process to ensure uniform blending of various components, ensuring the evenness of subsequent vulcanization reactions.


The well-mixed solid silicone HTV is transferred to molding equipment, where it is shaped according to the product's form and size. This can be achieved through processes such as calendaring, injection molding, compression molding, etc.


The molded product undergoes vulcanization. This involves placing the solid silicone HTV in a high-temperature environment, triggering the action of the vulcanizing agent. This reaction forms cross-linked structures between silicone molecules, enhancing elasticity and heat resistance.

Cooling and Post-processing

After the vulcanization reaction, the product needs to cool to solidify. Subsequently, various post-processing steps may be required, such as trimming, cutting, surface treatments, etc., to meet the final product's specifications.
The specific implementation of these steps may vary based on production processes and product requirements.

Product Characteristics of Solid Silicone HTV

Solid Silicone HTV possesses various product characteristics, including:

High-Temperature Resistance

After undergoing high-temperature vulcanization, HTV silicone exhibits superior resistance to high temperatures, making it suitable for extreme temperature environments.

Excellent Elasticity

Once solid silicone HTV forms cross-linked structures, it demonstrates outstanding elasticity, maintaining its shape and adapting to various strains and deformations.

Outstanding Insulation Performance

Post-vulcanization, HTV silicone typically has excellent insulation performance, making it suitable for manufacturing electronic components, electrical wire insulation, and other applications requiring insulating materials.

Chemical Stability

Due to the chemical stability of silicone, solid silicone HTV shows good resistance to chemical corrosion, maintaining stability in different environments.

Anti-Aging Properties

Over prolonged usage, solid silicone HTV retains stable physical and chemical properties, exhibiting strong resistance to aging.

Diverse Hardness Options

The hardness of HTV silicone can be adjusted through different conditions and additives during the vulcanization process, meeting the hardness requirements for various applications.

Production Adaptability

The manufacturing process of solid silicone HTV is relatively flexible, capable of meeting the diverse product requirements in terms of shapes and sizes. It is applicable to a variety of production applications.

Types and Applications of Solid Silicone HTV?

Due to its flexibility in meeting various needs, solid silicone HTV has given rise to different types to cater to diverse industries and applications. Here are some common types of solid silicone HTV:

High-Elasticity HTV

Designed for applications requiring exceptional elasticity, such as the production of elastic pads and seals. High-elasticity HTV exhibits outstanding stretching and deformation capabilities.

High-Hardness HTV

Suitable for applications demanding a harder surface, like manufacturing rubber pads and tire components. High-hardness HTV provides higher physical hardness and wear resistance.

High-Transparency HTV

Used in industries requiring transparent or semi-transparent products, such as the production of seals and car light covers. High-transparency HTV ensures a visually appealing finished product.

High-Temperature Resistant HTV

Facing extreme high-temperature environments, like sealing materials for automotive engine compartments and electronic components. High-temperature resistant HTV maintains stability and performance.

Low-Temperature Curing HTV

Used for applications requiring curing in low-temperature conditions, such as outdoor cable insulation materials and low-temperature seals.

Food-Grade HTV

Applied in the food and medical industries, for example, in manufacturing food packaging and medical device sealing components. It complies with relevant regulatory standards for safety.

Low-Volatility HTV

Applicable to applications requiring low volatility, such as automotive interior materials and sealing for electronic components, ensuring products do not release harmful gases during prolonged use.


Different types of solid silicone HTV are usually customized by adjusting components, vulcanization conditions, and adding special additives to meet specific application requirements. With over 30 years of experience, GSUN specializes in this field, providing high-quality customized products to meet the diverse needs of the market. Feel free to contact us for comprehensive solutions!

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