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


Post-mix dwell time

Post-mix dwell time

Post-mix dwell time

What is the preferred dwell time from mixing to processing? As a rule my current company leave material for 72hours before processing (NR, EPDM and NBR polymers). Is this excessive? I have previously worked in a company that kept to 48hrs.

What is the general opinion; pros and cons etc.


RE: Post-mix dwell time

I always thought 24 hours/overnight was the norm.

RE: Post-mix dwell time

Generally, I agree with Tom but work I carried out some years ago with NR/BR truck/bus tyre tread formulations showed that you can get away with about 3 hours and still get good extrusion performance.

RE: Post-mix dwell time

Thanks guys, when I worked in a compound development lab (many moons ago) we waited 24hours from mixing to moulding/extrusion (all moulding was compression). In production they used material after 48hours, once the material has completely cooled I couldn't think of a good reason for waiting longer....

Today we are injecting, compressing and extruding the compounds. I want to challenge this 72hour, but wanted to know what the general consensus was.

Thanks again...

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