Why Rubber to Metal Bonded Parts Go Wrong and How to Buy Them

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Bushings, mounts and anti vibration parts fail at the bond far more often than in the rubber. Split sourcing is the reason, and it is fixable at the purchase order stage.

The Bond Is the Product

In a bonded part the rubber and the metal are both straightforward. The interface between them is not. It depends on the metal surface condition, the surface preparation, the bonding system and the moulding cycle, and each of those sits with a different party when the part is sourced in pieces.

What Split Sourcing Does

A machine shop makes the insert to drawing and ships it. A coating shop treats it. A moulder bonds rubber to it. When the bond fails in service, each of the three can demonstrate that their own operation met specification, and the buyer owns a problem that nobody will accept. This is the single most common way bonded part programmes go wrong.

How We Handle It

We have our own machining workshop and coating workshop. We can process the metal parts and then produce the rubber onto those metal parts, so the surface condition, the preparation and the moulding cycle are all controlled by the same team in the same building. When something is wrong there is one place to fix it.

Shock Absorber Bushings and Shocker Bushes →

What to Specify When You Buy

Give the metal specification and any plating or coating requirement, the rubber compound or the service conditions, the expected loading and movement, and the environment the part lives in. Suspension bushings and shocker bushes see very different loading from a static mount, and the compound and geometry follow from that.

Proving It Before Volume

Ask for first article samples from the production tool and test them in the actual assembly rather than on the bench. A bond that passes a pull test can still fail under real cyclic loading, and finding that out at sample stage is far cheaper than finding it out in the field.

Custom Moulded Rubber From Drawing to Production →

Products Mentioned in This Guide

Shock Absorber Bushings and Shocker Bushes

Bonded rubber to metal parts fail at the interface far more often than in the rubber, and split sourcing is why.

Rubber Moulds

We have our own mould manufacturing workshop and experienced structural design engineers, so we can independently design and develop rubber moulds rather than pass the work on.

SBR Rubber Parts and Counterweight Blocks

SBR is the compound to reach for when abrasion resistance and cost matter more than chemical range.

Quick Answers

Yes. We have our own machining workshop and coating workshop, and we then produce the rubber onto the metal parts.

Yes. Our structural design team can design the product structure from a sample and manufacture the mould independently.

Automotive shock absorbers, bushings and shocker bushes are the main ones, along with anti vibration parts for equipment.

Put This Into a Quotation

Send the size, the medium and the quantity, and we will apply exactly the reasoning in this guide to your part.