Steel Bonded Neoprene Sealing Washer

The Steel Bonded Neoprene Sealing Washer from Xiaoguo® factory don't rust easily. They're made of metal with a rubber layer, so they can stand up to acids, alkalis, and rain. That makes them a good choice for rough industrial environments.

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Product Description

The core technology of Steel Bonded Neoprene Sealing Washer is the vulcanization bonding of rubber and metal.

（1）Preparation of raw materials

Metal part: The steel strip is processed by cold heading or stamping to form the blank of the required size for the Steel Bonded Neoprene Sealing Washer.

Rubber part: Chloroprene rubber is mixed with vulcanizing agent, accelerator, filler, etc. according to the formula to form the rubber compound.

（2）Metal surface treatment

The metal washer undergoes degreasing, sandblasting or chemical treatment to remove the surface oxide layer and oil stains, and forms a microscopic rough surface, enhancing the adhesion between the rubber and the metal.

（3）Adhesive coating (base coat + top coat)

First, spray or dip a layer of base coat (adhesion promoter) on the metal surface, then let it dry before applying the rubber-specific adhesive.

Steel Bonded Neoprene Sealing Washer

Mon	φ27	φ30	φ33	φ36	φ39	φ42	φ45	φ48	φ52	φ56	φ60
d max	27.365	30.395	33.395	36.395	39.395	42.395	45.395	48.395	52.53	56.53	60.53
d min	27.035	30.005	33.005	36.005	39.005	42.005	45.005	48.005	52.07	56.07	60.07
dc max	36.395	39.395	42.395	45.395	48.395	52.53	56.53	60.53	64.23	68.23	72.23
dc min	36.005	39.005	42.005	45.005	48.005	52.07	56.07	60.07	63.77	67.77	71.77
h max	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2
h min	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8

（4）Sulfurization molding

Place the metal Steel Bonded Neoprene Sealing Washer coated with adhesive into the mold, and inject a certain amount of un-sulfurized chloroprene rubber. Heat it to 150℃ - 180℃ for 3 - 8 minutes. During this step, the rubber reacts with sulfur and sticks permanently to the adhesive on the metal surface. So the bond is strong and won't come apart.

（5）Trimming the edges

After that, thin rubber edges can show up along the mold lines. You can remove the extra rubber by hand, or use a freezing trimming machine or a cutting die. That way the product looks clean and the size comes out right.

（6）Extra curing

For some products that need better quality, we do another round of curing in an oven. This helps make the rubber more stable.

（7）Quality inspection

Appearance inspection, size sampling test, hardness test, destructive peel test, compression permanent deformation test, etc.

（8）Packaging and Shipping

Qualified Steel Bonded Neoprene Sealing Washer are packaged according to customer requirements and are accompanied by test reports or material certificates.

Steel Bonded Neoprene Sealing Washer