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Custom Silicone Bellows & Dust Boots

Silicone bellows and dust boots that flex, seal and protect across movement — for shafts, joints, cables and connectors, molded to your travel and geometry.

Flexible Protection

Bellows That Flex Without Failing

A bellow absorbs movement while sealing out dust, moisture and debris. We mold silicone bellows and dust boots with convoluted, tapered and custom profiles that extend and compress reliably across thousands of cycles.

  • Convoluted bellows — for long travel and flex
  • Dust boots & gaiters — for shafts and joints
  • Cable & connector boots — strain relief and sealing
  • Custom profiles — engineered to your travel and fit
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Translucent silicone bellows with accordion folds produced at the CYES SILICONE factory
Material & Performance

Choosing the Right Bellow Material

Match the compound to your flex, sealing and environment needs.

RequirementRecommended gradeTypical hardness
Automotive shafts & jointsSolid silicone rubber (RoHS / REACH)50 – 70A
Electronics / connectorsSolid silicone rubber, softer grade30 – 50A
Food & beverage equipmentFood-grade silicone (FDA / LFGB)40 – 60A
Fuel & solvent exposureFluorosilicone (FVMQ)60 – 70A

Compression Set

Compounds chosen for long flex life, so the bellow keeps sealing over repeated cycles.

Temperature Range

Rated from -40 °C to +230 °C depending on the compound selected.

Precision Fit

Mold cavities machined to ±0.01 mm, with finished-part tolerance confirmed during DFM.

Common Questions

Silicone Bellow FAQ

A bellow flexes to absorb movement while sealing out dust, moisture and debris. Common uses include shaft and joint protection, cable and connector strain relief, and flexible connectors between moving parts.
Yes. We mold bellows with convoluted, tapered and custom profiles engineered to your travel range, inner and outer diameter, and number of convolutions.
Most bellows use Shore 40A–60A — soft enough to flex easily, firm enough to hold shape and resist collapse. We recommend a hardness for your travel and environment.
Yes. We offer food-contact and medical-grade platinum-cured silicone bellows tested for FDA 21 CFR, LFGB, RoHS and REACH compliance as required.

Need Silicone Bellows?

Send your drawing, sample or dimensions. We will review material, hardness and tolerance before quoting.

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