Auto Parts Rubber Bonded Washer Oil Seal Steel Bonded Seal

Bonded Seals

A bonded seal is a type of washer used to provide a seal around a screw or bolt. 
A bonded seal consists of an outer annular ring of a hard material, typically steel, and an inner annular ring of an

elastomeric material that acts as a gasket.

It is the compression of the elastomeric part between the faces of the parts on either side of the bonded seal that provides the sealing action.
The elastomeric material, typically nitrile rubber, is bonded by heat and pressure to the outer ring, which holds it in place.
This structure increases resistance to bursting, increasing the pressure rating of the seal.

Because the bonded seal itself acts to retain the gasket material,there is no need for the parts to be sealed to be shaped to retain the gasket.

This results in simplified machining and greater ease of use as compared to some other seals, such as O-rings.

Some designs come with an additional flap of rubber on the internal diameter to locate the bonded seal at the centre of the hole,

these are called self-centring bonded washers.

DMS SEALS was established in 2008. We are a technology enterprise which specialized in the production of seals,

the development of seals material and the solution of the sealing of special working condition.

We own 120 staffs which including 70 middle and senior technicians.

Our factory covers more than 10000 square meters which including 8000 square meters for the workshop.

Our production equipment and test equipment are on leading level in the same industry.

We are the one of the biggest enterprise who specialized in manufacturing and developing seals in China.

We have long time cooperation and communication with many universities and research institutions at home and board.

We have already passed the certification of ISO 9001 and TS 16949. We have the mature technical reserve for the

solution of ultra-high temperature, ultra-high pressure, ultra-low temperature, highly corrosive and other special working

condition.