×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Living Hinge Design
3

Living Hinge Design

Living Hinge Design

(OP)
Has anyone ever had any experience designing a living hinge out of Delrin?  I need a tough material that will be resistant to automotive fuels.

RE: Living Hinge Design

DElrin is not suitable for living hinges. Use polypropylene only.

RE: Living Hinge Design

(OP)
Polypro is too soft for what I need.  I only need the hinge to survive a few cycles, once it is assembled, it will not be unassembled.

RE: Living Hinge Design

While PP makes the "best" live hinges, any plastic that can form linear crystals (ie any plastic that makes good fibres) can make a reasonable live hinge. Nylon can work if it's other properties are OK. It will have limited hinge life compared to PP.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

RE: Living Hinge Design

I agree with Pat. Also, if you don't know nylons have very good resistance to automotive fluids such as gasoline / petrol. You can find a comparison of chemical resistance for many common thermoplastics at http://www.rtpcompany.com/

Nylon becomes much softer and with better elongation to beak only after some time exposed to humidity in the air. That means it's not a good idea to flex the hinge straight from the mold, better to wait. Also you can speed up the flexibilisation by dipping it in water for some time.

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!


Resources