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


Need advice for vulcanizing shore A-70 rubber.

Need advice for vulcanizing shore A-70 rubber.

Need advice for vulcanizing shore A-70 rubber.

I need to know how much I shall use of each part of natural rubber and sulphur in order to make vulcanized rubber with a hardness of A-70. Also interested in which temperature and heating time.

Are there any good online stores where I can buy natural rubber and sulphur in small amounts for testing it out?

RE: Need advice for vulcanizing shore A-70 rubber.

A typical sulfur level will be between 2 and 3 parts per hundred parts of raw rubber, aided by an accelerator, but that will only give you a vulcanisate hardness of ca 35 t0 40 Shore A. You'll appreciate the need for a loading of filler and the choice will depend on the properties you need. A higher than normal sulfur level will certainly raise hardness but at 70 A the properties will be awful, ie in the dip between vulcanised rubber and ebonite.
For samples I suggest you contact a friendly rubber company nearby, as you were advised to do in answers to your earlier 2011 enquiry.

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