bond hard rubber to hard rubber 1

[escudo]

I need to bond a broken hard rubber tube ( 9/16" OD, 1/16" wall thickness). Needs to have structural strength, break was clean. Many adhesieves for rubber products, but none call out vulcanized hard rubber (ebonite, vulcanite). Trying to avoid sleeving the break. Thanks.

 

[corrosionman]

Escudo any epoxy adhesive will be ok for your job and will give a bond strength equal to the strength of the base material. However why not smear a bit of glue on the tube just to check. DW

 

[ElastomerXpert]

I am surprised you have anything made in recent years with an ebonite tube in it. That material was common up through maybe 1960, but is now produced in very limited amounts for special applications. Are you sure it was ebonite, not just a very old rubber tube that had hardened with age? In any case, if it was ebonite, some regular adhesives (e.g. epoxy) might work. The classic answer would be to make a cement of a Natural Rubber compound (dissolved in solvent) with an excess of sulfur in the cure system, paint that on the two surfaces, let dry, press together and expose to heat (300 deg F or more) for an hour or so. But sleeving seems easier!

R J Del Vecchio
Technical Consulting Services
(consultant in Applied Rubber Technology)

 

[justasking]

Epoxy sounds fine, but personally, I would select a urethane adhesive system.

 

[Rogerio1]

I haven't been able to get 2-component Polyurethane to adhere to EPDM rubber. Does anybody know of a way of accomplishing this (additives or a primer)?

 

[justasking]

I seem to recall that some years ago, Hughson Chemicals, or Lord Manufacturing had a Chemlok system capable of bonding EPDM. Suggest that you try them.