Custom made silicone rubber bellow cover

A silicone rubber bellow cover encloses a moving interface with a folded rubber wall. The folds allow the cover to change shape as the enclosed parts move, while the end profiles establish its connection to the surrounding assembly. Custom dimensions, hardness and color support a design matched to the mechanism.

Begin with the two attachment positions through the entire movement. Their closest and furthest separation define only part of the required geometry. Any sideways offset or change in angle also affects where the folds open and where they approach one another. The relaxed cover length should therefore be considered together with the installed motion rather than copied from one stopped position.

At the compressed position, leave room for the folded material. It should not be trapped between a bracket and the moving component or forced into a sharp corner. At extension, check that the cover still has the intended shape rather than becoming the component that limits the mechanism's travel. Its outer envelope also matters: a fold that clears nearby hardware when relaxed may move toward it during operation.

Fit the ends in their correct orientation without winding the cover around its axis. A twist introduced at assembly can make one side fold differently and concentrate contact in a small area. Check that the end attachment retains the rubber without pinching the active folds.

Choose the silicone formulation for the substances and cleaning conditions around the mechanism. During maintenance, remove accumulated material from between folds using a method that does not damage the wall, then inspect the end transitions and fold valleys for cuts. Access for this inspection is useful to consider when positioning the cover within the equipment.

Material options

Custom silicone compound; formulation and geometry developed together.

Hardness selection

Silicone options: 20–80 Shore A. At the compressed position, leave room for the folded material.

Custom geometry

Custom dimensions, hardness and color support a design matched to the mechanism.

Fit evaluation

Check that the end attachment retains the rubber without pinching the active folds.

Color & OEM

Custom colors; identification clear of folds and end connections.

Photos illustrate structure or material appearance only. A silicone rubber bellow cover encloses a moving interface with a folded rubber wall. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.