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


What material is pencil eraser

What material is pencil eraser

What material is pencil eraser

What material would be specified for erasing graphite marks, such as used in Staedtler-Mars erasers?

RE: What material is pencil eraser

Can be a number of things. Raw (un-vulcanized) or "gum" rubber, vulcanized rubber and other elastomers with or without abrasive fillers, plasticized pvc or vinyl. The Staedtler-Mars erasers are most likely a filled vinyl, from what's available on the web.

RE: What material is pencil eraser

My own experience has been confined to traditional vulcanised natural rubber based erasers intended for pencils and inks, and in these a principal ingredient has always been the abrasive pumice, with higher levels being added in an ink rubber. For 'soft' graphite the usual contenders include the kneaded or 'putty' erasers. The composition of these can vary quite markedly with polyisobutylene or plasticized PVC being found in some instances, and uncured rubber in others. One ingredient that has been used in rubber systems is factice(vulcanized vegetable oil) which has friable characteristics. Tackifiers may also been present to assist the adhesion of the graphite particle away from the substrate but there can be a risk of smearing.

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