Custom Rubber Bellows: High Temperature Silicone Rubber Bellows for North American Industries

High temperature components form the backbone of most modern industrial equipment. They absorb forces that would otherwise cause catastrophic and expensive failure. Well specified silicone rubber bellows outperform every alternative elastomer. They protect equipment from vibration, thermal expansion and misalignment.

Custom Rubber Bellows manufactures premium grade flexible connectors for this use. Silicone rubber withstands extreme thermal conditions no other material can. Correctly formulated silicone rubber bellows perform reliably across very wide temperature ranges. They are an essential component in automotive, aerospace and manufacturing sectors.

What Temperature Range Can High-Temperature Silicone Bellows Withstand?

The standard silicone operates reliably between -60°F and 400°F. The specially formulated high temperature grades handle 500°F on a fully continuous basis.

Their short term peak exposure can reach as high as 600°F without permanent damage. This performance remains consistent across thousands of full thermal cycles. Most competing materials begin to degrade long before reaching these temperatures. All pharmaceutical grade bellows receive full independent third party certification.

• Retains full rated flexibility at both ends of the temperature range
• Does not suffer permanent compression set after extended heat exposure
• Shows almost no change in durometer across the full operating range
• Does not outgas significant amounts of material at maximum temperature

Most competing materials begin to harden at temperatures above 300°F. Neoprene becomes brittle and cracks after only a few hundred hours at 350°F. EPDM loses almost all flexibility once temperatures exceed 375°F.

Natural rubber begins to decompose completely at temperatures above 250°F. This wide operating window makes this material the first choice for most thermal applications. Many industrial applications specify silicone rubber bellows for this exact reason.

How Does Silicone Rubber Compare to Other Bellows Materials?

Every elastomer material comes with specific strengths and limitations.  Silicone outperforms most common alternatives in a number of key areas. It offers far better ozone resistance than any grade of natural rubber for medical silicone bellows. Its resistance to UV degradation exceeds even the best available EPDM formulations. It provides much higher chemical inertness than any standard nitrile rubber.

• Remains flexible at temperatures where most other materials turn rigid
• Does not support combustion or propagate flame under most conditions
• Maintains consistent physical properties over much longer service life
• Produces almost no particulates as it wears during normal operation

Silicone does have some important limitations that must be considered. Its tear strength is lower than comparable grades of natural rubber. Its abrasion resistance is significantly lower than polyurethane. It offers excellent electrical insulation properties for high voltage applications.

The base material is completely non-toxic and produces no odour during use. FDA bellows are almost exclusively manufactured from this base material. Many sanitary applications use pharmaceutical grade bellows for this exact property.

 

Design Features for Thermal Applications

The performance of USP Class VI bellows at extreme temperature depends as much on design as material. The best elastomer will fail prematurely if manufactured with an unsuitable design. Several specific design features improve performance at high temperatures.

Multi-Ply Construction
Multiple thin layers of material deliver higher strength than one thick layer. This design also allows much greater flexibility across wider temperature ranges.

Convolution Geometry
The shape and depth of each convolution controls all available movement. Correct design allows axial, lateral and angular offset without excess stress.

Reinforced Layers
Internal reinforcement layers prevent ballooning of the bellow under operating pressure. This becomes far more important at elevated operating temperatures.

Flange Configuration
Custom flange designs allow direct bolt on installation to almost any equipment. No adapter plates or modification of existing hardware is required.

Fabric Reinforcement
Additional fabric reinforcement can be added for specific high load applications. This improves burst pressure without significant loss of flexibility.

Smooth Bore
A fully smooth internal bore reduces fluid turbulence and prevents material build up. This feature is almost universal for food processing equipment bellows.

Wire Helix
An internal wire helix prevents the bellow from collapsing under negative pressure. This feature is required for most vacuum and high flow applications.

The correct design can extend the service life of a bellow by a factor of three or more. The high temperature silicone bellows require specific design tuning to reach full rating.

Can Silicone Bellows Handle Chemical Exposure Along with Heat?

Temperature is never the only stress applied to an operating bellow. Most industrial applications also expose components to a range of chemicals. USP Class VI bellows are tested for both thermal and chemical compatibility.

The performance of silicone when exposed to chemicals varies widely by substance. It offers excellent resistance to most dilute acids and bases. It is completely compatible with both steam and continuous hot water exposure. It is fully unaffected by atmospheric oxygen and most common gases.

It will degrade rapidly when exposed to strong concentrated acids. It has very poor resistance to petroleum based oils and greases. It will swell significantly when exposed to most aromatic hydrocarbons. It is completely unaffected by almost all neutral aqueous solutions. The autoclavable silicone bellows are the standard for repeated steam sterilisation cycles. 

How to Select the Right Silicone Bellows for Specific Applications?

Step 1. Establish the maximum and minimum continuous operating temperature.
Step 2. Calculate the total required axial, lateral and angular movement.
Step 3. Define the maximum and minimum operating pressure for the application.
Step 4. Compile a complete list of all expected chemical exposures.
Step 5. Measure the exact available installation space and envelope dimensions.
Step 6. Confirm the required flange type, size and mounting hole pattern.
Step 7. Document all additional environmental conditions for the installation.
Step 8. Identify any industry specific certifications required for the component.

The medical silicone bellows have additional requirements not listed on standard data sheets. The food safe rubber bellows require additional testing and certification for contact. It is better to specify a slightly higher rating.

About Custom Rubber Bellows Company

We are a specialised manufacturer of custom bellows for industrial applications. Every FDA bellows is manufactured from fully certified raw material. We operate within North America and serve all continental markets. We provide full in house engineering support for all custom application requests. All tooling and prototyping work is completed on site at our facility.

Our production runs range from small prototype batches to full volume production for many parts like food safe rubber bellows. We operate an on site quality testing laboratory to validate all performance specifications.

Full technical data sheets are available for every standard and custom product. We offer fast turnaround on all custom design and production requests. Working directly with us as the manufacturer eliminates all middleman delays.

All silicone rubber bellows are fully tested to their stated temperature rating. Our engineering team will select the correct material and design for each application.

Frequently Asked Questions

1. What temperature range can high-temperature silicone bellows withstand?

Standard silicone bellows operate between -60°F and 400°F, while high-temperature grades handle 500°F continuously and can briefly withstand peaks up to 600°F without damage.

2. Why is silicone better than neoprene or EPDM for high-heat applications?

Neoprene becomes brittle around 350°F and EPDM loses flexibility above 375°F, while silicone stays flexible and stable across a much wider temperature range.

3. Can silicone bellows resist chemical exposure along with heat?

Yes, they resist dilute acids, bases, steam, and hot water well, but should be protected from strong concentrated acids, petroleum oils, and aromatic hydrocarbons.

4. What steps should I follow to choose the right silicone bellows?

Define your temperature range, required movement, operating pressure, chemical exposure, installation space, flange type, and any needed certifications before selecting a bellow.

5. Which bellows are suitable for food-grade or medical applications?

USP Class VI and FDA-certified silicone bellows are used for medical, pharmaceutical, and food processing applications, and are typically autoclavable and fully tested.

Conclusion

The high temperature silicone rubber bellows remain the first choice for demanding applications. Custom Rubber Bellows delivers engineered solutions for all thermal applications. The base material properties are perfectly suited for extreme temperature environments.

The right selection and design ensure a very long and reliable service life. Consistent manufacturing quality is the largest single factor in performance. Custom configurations are available for any unique or specialised requirement.

We manufacture custom rubber bellows from high temperature silicone. These bellows hold up to extreme heat, chemicals and constant movement without cracking, tearing or failing. We make them exactly to your dimensions and specifications. Tell us what you need. You can reach us at +1 917-730-4350 or at info@customrubber-bellows.com.