What Adhesive for Teflon On …

A. Dear Mr Santosh,

Teflon has very low coefficient of friction and it will not adhere properly. But you try some perfluorinated kerosenes to dissolve Teflon and try to bond with metal. An epoxy adhesive [on eBay or Amazon] may be tried but adhesion cannot be ensured. If you can adopt sintering technique, you may get some good bonding.

Regards,

A. Normal Teflon sheet cannot be pasted using an adhesive. You get special Teflon sheets with one side etched. Only these sheets can be pasted properly. Contact your Teflon sheet supplier for that.

A. You may need to etch the Teflon first with a product such as this: http://www.actontech.com/fluor1.htm

I believe W. L. Gore & Assoc used to make a similar product called Tetra-Etch.

A. Dear sir, treat the surface to be bonded with Metallic sodium in ammonia. Then use an epoxy to bond the surface with the substrate.

Regards,

A. I am not sure there is a suitable adhesive for PTFE. I would look at spraying an emulsion of PTFE particles onto the surface and then sintering it. You may benefit from roughening the surface of the substrate by shot blasting it with alumina or something similar, and then spray and sinter the PTFE. This will improve its bonding.

A. Teflon is highly hydrophobic and nothing sticks to it. Plasma treatment would increase the surface energy and makes it less hydrophobic. Once this is done the adhesive would wet the surface of Teflon and bonding becomes easier.

A. The only successful activation of PTFE that I have used is with a chemical called Tetra-Etch from Gore. The chemical is particularly nasty, should only ever be handled by professionals, used under active extraction with appropriate PPE to protect your skin. The material also needs to be stored in a fridge.

I will not even guarantee that this will be sufficient to activate the surface of the PTFE.

The next thing to do is to talk to the manufacturers of adhesives, they will be able to advise you of the most suitable adhesive to use for PTFE (if there is even such a thing), so try the likes of Huntsman, 3M, Cray Valley, Hexcel, etc., and see what they have.

A. PTFE Teflon plastic sheet can be bonded to rubber diaphragm and to steel substrate. Chemically Etch the Teflon that will carry the adhesive, wipe the steel or rubber with acetone [on eBay or Amazon], wait until dry. Brush, spray or roll on a coat 3M Neoprene based rubber contact cement to each substrate, allow to dry 10-15 minutes or until tack. Lay up the rubber or Teflon; roll with a cylinder to escape the trapped air bubbles. Our company has been doing this for two generations.

A. I was responding to the forum inquirer about Teflon bonding adhesive. There is an adhesive which will bond to Teflon or steel or aluminum substrates and other substrates which are low energy surfaces. This special adhesive is called LEA16.

Thanks.

A. Hi avijit. As you see, we appended your inquiry to a thread where the same (or at least a similar) question was already asked and answered. Please request clarification on any prior answers if needed, or follow up with any particulars that make your situation different. Thanks!

Regards,

A. As mentioned above both rubber & teflon are low energy surfaces - teflon more so. One way to increase surface energy is to expose these to either low pressure or atmospheric plasma of oxygen, air or argon. Plasma, in addition to cleaning the surface, can make it functional which improves wettability and bonding.

A. Hi there, I got to know that there is a product called treated Teflon PTFE, it is actually treated by sodium, and after treatment its surface becomes active like metal. Thereafter if we use Lords Chemlok 220 solution on it and vulcanize with nitrile, natural or any synthetic rubber bonding result become fantastic.

A. Hi cousin Nishant. Please comment on your successes or lack of success with the many suggestions already offered over the past 14 years. Are these sheets of Teflon "factory etched" on one side as suggested, or plasma treated? If not, have you tried the perfluorinated kerosene, Fluoro-etch, the twice recommended Tetra-Etch, or the metallic sodium in ammonia [on eBay or Amazon] that was suggested to activate them?

For adhesive, did you try the Chemlok 220, or the rubber cement, or the LEA16 that have been suggested? Thanks.

Regards,

 Dear Ted,

Thank you for your prompt reply.

I will take a trial as per your suggestion.

hope for the positive result.

Regards,
Nishant