Custom Clear Silicone Rubber Flat Gasket

DoonX specializes in custom precision silicone rubber washers and seals. Our silicone rubber products excel in extreme temperatures (-67°F to +400°F, intermittent to +450°F) and offer superior chemical resistance, waterproofing, fire resistance, fungal resistance, ozone resistance, heat resistance, and durability. 

Silicone rubber is exceptionally flexible, heat resistant, and demonstrates excellent electrical insulation properties. The material is also water repellent, chemically inert, and non-toxic, and is FDA approved for use in medical and food-grade applications (primarily for gaskets and seals).

Properties of Silicone Rubber Materials

Silicone rubber offers a unique combination of mechanical, chemical, electrical, and thermal properties. Knowing the distinctive features of silicone rubber is critical to help you select the right grade for your application. Let’s take a look at the unique features of silicone rubber.

Physical properties

• Silicone rubber is a flexible, elastomeric, high-performance engineering material.
• Elasticity imparts excellent resistance to a wide range of deformations. It also offers superb recovery performance.
• Silicone rubber is inert to many common chemicals and does not degrade in most environments.
• Used for extended periods in extreme temperatures without significant property degradation. Hence, silicone rubber has excellent temperature resistance in both hot and cold conditions.
• Silicone rubber has good dimensional stability, inherent purity, and biocompatibility.

Mechanical properties

Silicone rubber polymer shows excellent mechanical properties.

• Silicone rubber exhibits exceptional elongation properties, high flexibility, and resilience.
• The polymer also exhibits excellent compression set resistance. When combined with elasticity & tensile characteristics, it provides an excellent balance of properties. For example, where the material is required to withstand repeated deformations for long periods at various temperatures without permanent shape changes.
• Silicone rubber has a good elastic modulus over a wide temperature range.
• Manufacturing parts made with silicone rubber are flexible. They can maintain their properties in diverse environments.

Thermal properties

Silicone rubber and its composites are suitable for extreme temperature applications. These include aerospace, automotive, medical, electrical, and consumer product applications. The thermal properties which silicone rubber exhibits include:

• Wide operating temperature range, -55°C to 300°C
• Low glass transition (Tg) temperature, typically below -120°C
• High thermal stability, maintaining properties over a broad temperature range

Electrical properties

• Silicone rubber exhibits high dielectric strength and excellent electrical insulation properties.
• Silicone rubber maintains good insulating properties in a broad temperature range and environmental changes.

Flammability

• Silicone rubber has a UL 94 V-0 flammability rating for certain formulations.
• Silicone rubber has a Limiting Oxygen Index (LOI) that can exceed 25%.
• Its smoke emission and toxic gas generation is generally low, especially compared to organic rubbers.

Benefits of Silicone Rubber Gaskets

Lauded for its versatility, there are a lot of good things to say about silicone rubber seals. These are some of the main ones.

High tensile strength

Tensile strength is the ability to remain intact when subjected to opposing forces.

Due to the flexible nature of the silicone polymer chains, silicone rubber washers exhibit exceptional resistance to tearing. The elongation capacity of silicone rubber gaskets is notably superior to that of traditional rubber materials.

Durable

Silicone rubber gaskets are resilient but long-lasting. The average silicone rubber gasket can maintain its properties for about 20 years.

They’re resistant to compression set, temperature extremes, and environmental degradation. They’re very conformable, making for excellent use in automotive, aerospace, and industrial applications.

Temperature Versatility

Dependable performance from frigid lows of -67°F to scorching highs of +400°F (with intermittent use up to +450°F).

Because of the strong silicon-oxygen bonds found in the chemical structure of silicone rubber, it doesn’t degrade easily at high temperatures. The temperature range of silicone rubber gaskets is significantly wider than many other elastomers.

Insulating

Silicone rubber functions as an excellent electrical insulator, and it doesn’t conduct heat well, making it good for electrical applications and thermal management.

Chemical resistant

As a chemically inert material, silicone rubber can withstand exposure to many substances. Why? Because it has a stable molecular structure with strong silicon-oxygen bonds.

Chemical Resistance Index (CRI) measures the ability of a material to resist degradation when exposed to various chemicals.

If the material has a high CRI, it’s less likely to degrade in harsh chemical environments. Silicone rubber’s CRI is relatively high – less likely to degrade in many chemical environments.

Biocompatible

Because of silicone rubber’s structure, it doesn’t typically cause adverse reactions in biological systems. Silicone rubber rarely triggers immune responses or toxicity when it comes into contact with living tissues, making it suitable for medical and food-grade applications.

Customize your Silicone Rubber Gaskets with DoonX

DoonX is at the forefront of precision gasket manufacturing, offering tailored solutions that highlight our technical prowess. Our commitment to excellence is reflected in our ability to provide custom gasket machining services, ensuring that your specific requirements are met with precision and efficiency.

Should you require customizations or have specific needs that extend beyond our standard product range, we invite you to take advantage of our “request a quote” feature on our website.

At DoonX, your satisfaction is our priority, and we are dedicated to delivering the finest gasket solutions to meet your unique requirements.