Rubber coating for Low Temp

[Hercules28]

Dear all,

I am looking into spraying a thin coating on a rubber gasket. (Regular spraygun). The purpose is to be easier to slide on ductile iron.
Also it should decently withstand low temperatures of -40degC.

Thanks

Herc

 

[btrueblood]

How long do you want the coating to last? What kind of rubber? It sounds like you need a good low-temperature temporary lubricant (e.g. grease), but not clear from your post.

Typical installation lubricant, for low temperature, would be a soap+water+alcohol solution. Most, but not all, rubber compoounds will be ok with this.

Second choice (better properties but more expensive) would be a silicone grease, or oil - not usable on silicone rubber however. Not very sprayable, but they do stay pliable at low temps.

More permanent coatings, e.g. a teflon coating, are more expensive, and need to be molded on. They will last a bit longer than a lubricant.

 

[Hercules28]

I would expect it to last a few months.
Silicon rubber.
I want this to be a part of production so I want to spray it and i want it to stick on the Si rubber.

Will the lubricant you are referring to stay on the part?

How much do you think a teflon coating would cost? And do you have a link on how you apply it?

Thanks again!

 

[btrueblood]

You've picked the toughest possible combination.

Don't use silicone lubricants on silicone rubber.

No, a grease can't be expected to survive very long, if the part needs to slide consistently over several months, unless replenished. You might try petroleum greases with silicone rubber.

Doubt you can overmold silicone rubber with teflon.