Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Air Bubbles in EPDM Rubber Membrane

Air Bubbles in EPDM Rubber Membrane

Air Bubbles in EPDM Rubber Membrane

Could anyone enlighten me with what may have caused this rubber membrane to get these air bubbles in it. The EPDM was used in an attempt to seal up a leak on a metal roof that had a galvalume finish. I am not sure what type of adhesive was was used to adhere it to the metal panel. Is the EPDM delaminating?

RE: Air Bubbles in EPDM Rubber Membrane

It is most likely just air that was trapped under the membrane during installation. The trapped air starts as a thin gap under the membrane, but the surface tension of the adhesive will cause the surface area of the bubble to minimize. The end result is a large round blister rather than a thin air gap under the membrane. Poke a hole in it to let the air out and then seal the hole with adhesive.
There are specific techniques required during installation to minimize the amount of air entrapment. If the membrane were transparent these techniques would be obvious.

RE: Air Bubbles in EPDM Rubber Membrane

Another possibility is that there was some residual solvent in the adhesive (or some other volatile hydrocarbon) that has swollen the EPDM rubber.

Tom Jablonowski, TSE Industries, Inc.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close