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Rubber to metal bonding with Viton B

I work in the custom rubber molding industry that manufactures seals for a variety of industries but mainly in the oilfield. I tend to have problems when trying to bond Viton B to a large metal surface by means of injection molding. I am using a chemlok recommended bonding agent for vitons but I am getting frustrated with the results. My surface prep consist of degrease, sand blast and then degrease on last time before applying the bonding agent to carburized steel.

Wayne Griffith
jobshop employee - Houston, Texas
January 21, 2009

I would look at contamination in the blast step or the final degrease has oil in it. Yes even vapor degrease has some oil. A caustic tank frequently has a thin oil film. Manual degrease with acetone ⇦this on eBay or Amazon [affil links] Warning! highly Flammable! or alcohol normally is not effective.

James Watts
- Navarre, Florida
January 23, 2009

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February 10, 2009

Wayne,

I am somewhat familiar with Chemlok adhesives - one of our sister plants makes it and we use many Chemloks in our own elastomer/metal bonding :)

Are you able to verify surface cleanliness prior to application? What is your application method and dry film thickness? Finally, which Chemlok system are you using?

Terry Lycans
Aerospace - Dayton, Ohio, USA