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Precision Engineering: Select The Right High Temp Structural Adhesive

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When it comes to precision engineering, selecting the right high temp structural adhesive is crucial for ensuring the durability and performance of components and assemblies operating under extreme temperature conditions.

High temp structural adhesives are specifically formulated to provide strong bonding capabilities and maintain their integrity even in environments with elevated temperatures.

In this blog, we will explore what high temp structural adhesives are, why they are essential, and their applications, and recommend a suitable sealing adhesive for your needs.

What Is High Temp Structural Adhesive?

High temp structural adhesive, also known as high-temperature sealant or high-temperature adhesive, is a type of bonding agent designed to withstand extreme heat without compromising its adhesive properties.

These adhesives are formulated using heat-resistant materials that can maintain their structural integrity and bonding strength in temperatures ranging from moderately high to extremely high.

High temp structural adhesives offer a reliable solution for joining and sealing components in industries such as aerospace, automotive, electronics, and manufacturing.

Why Is High Temp Structural Adhesive Needed?

There are several reasons why high temp structural adhesives are in high demand:

Temperature Resistance:

High temp structural adhesives are specifically engineered to withstand elevated temperatures that traditional adhesives cannot endure. They provide long-lasting bonding and sealing solutions for applications where exposure to high temperatures is a concern.

Strength and Durability:

These adhesives offer high-strength bonding, allowing components to withstand stress, vibration, and thermal expansion without compromising the structural integrity of the assembly. They ensure the durability and longevity of engineered systems operating under extreme conditions.


High temp structural adhesives can bond various substrates, including metals, glass, ceramics, and plastics. This versatility makes them suitable for a wide range of applications in different industries.

Applications Of High Temp Structural Adhesives:

High temp structural adhesives find extensive use in industries where components are subjected to high temperatures or thermal cycling. Some common applications include:

  •  Automotive:

High temp structural adhesives play a critical role in automotive manufacturing, particularly in the assembly of engines, exhaust systems, and brake components. These adhesives provide excellent resistance to heat and vibration, enhancing the overall durability and performance of vehicles.

  •  Electronics:

In electronic device manufacturing, high temp structural adhesives are utilized for bonding heat sinks, electronic modules, and circuit boards. These adhesives offer reliable thermal management, ensuring the efficient dissipation of heat generated by electronic components.

  •  Manufacturing:

High temp structural adhesives are essential in various manufacturing processes, such as bonding metal parts, sealing industrial ovens, and joining components in high-temperature equipment. They provide reliable adhesion and sealing even in demanding industrial environments.

high temp structural adhesive

Recommended High Temp Structural Adhesive: DOWSIL™ SJ268 Silicone Structural Sealant

When it comes to selecting a high temp structural adhesive, DOWSIL™ SJ268 Silicone Structural Sealant from Joinstar is an excellent choice.

This one-part silicone sealant is specifically designed for structural glazing and weather-sealing applications. Let's take a closer look at its features and benefits:

1) High-Strength Bonding:

DOWSIL™ SJ268 offers high-strength bonding between glass and metal frames, making it ideal for structural glazing applications. It ensures secure and long-lasting bonds even under high-temperature conditions.

2) Excellent Adhesion:

This sealant exhibits excellent adhesion to a wide range of substrates, including glass, aluminum, steel, and various plastics. It is also compatible with most building materials, providing versatility in bonding applications.

3) High Tensile Strength:

SJ268 Silicone Structural Sealant possesses high tensile strength, enabling it to withstand significant stress and movement without compromising its sealing properties. It ensures the durability and reliability of bonded assemblies.

4) Weather Resistance:

This sealant is highly resistant to weathering, UV radiation, and ozone, making it suitable for exterior applications. It maintains its sealing and bonding properties even when exposed to harsh environmental conditions.

5) Temperature Resistance:

DOWSIL™ SJ268 Silicone Structural Sealant can withstand temperatures ranging from -50°C to 150°C (-58°F to 302°F). Its high-temperature resistance makes it an ideal choice for applications requiring heat resistance and long-term durability.

6) Ease of Application:

This sealant is easy to apply and can be tooled to achieve a smooth finish. It ensures hassle-free installation and enables precise application in various bonding and sealing tasks.

7) Aesthetically Appealing:

The sealant is available in a range of colors, including clear, white, black, and gray. This variety allows for color matching to different substrates and satisfies aesthetic requirements.

Recommended Assembly Conditions:

To ensure optimal performance of DOWSIL™ SJ268 Silicone Structural Sealant, it is essential to follow these recommended assembly conditions:

Surface Preparation:

Apply the sealant to clean, dry, and sound surfaces. Remove any contaminants, such as oil, dust, or debris, to ensure proper adhesion.

Joint Design:

Follow the recommended joint design to achieve the correct sealant depth and provide sufficient movement capability.

Movement Capability:

Design the joint to allow for a minimum of 25% movement in the sealant to accommodate thermal expansion and contraction.

Ambient Temperature:

During application, maintain an ambient temperature between 5°C to 40°C (41°F to 104°F) for optimal results. Extreme temperatures outside this range may affect the curing and performance of the sealant.

Relative Humidity:

Ensure that the relative humidity during application is below 80% to prevent moisture from interfering with the curing process. Excess moisture can compromise the integrity and adhesion of the sealant.

Final words:

In conclusion, when it comes to precision engineering and high-temperature applications, selecting the right high temp structural adhesive is crucial for ensuring reliable bonding and sealing.

DOWSIL™ SJ268 Silicone Structural Sealant offers excellent temperature resistance, high-strength bonding, and durability, making it an ideal choice for structural glazing and weather sealing applications.

By following the recommended assembly conditions, you can achieve optimal results and ensure long-term performance in demanding high-temperature environments.