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


Plastic selection query

Plastic selection query

Plastic selection query

Hi guys,

I'm a mechanical engineer with not a lot of experience in the plastics selection arena! Looking for some guidance and help in working through selecting a plastic. Specifically I am looking for a thermoplastic with the following properties:

- Good UV stabilization
- good mold flow
- Resistant to contaminants such as salt water, oils and other common chemicals
- Good flammability rating
- Very high impact strength and tensile strength at break

The material will be used in marine applications and will be sitting on a boat for its lifetime. I have checked out some of the materials database searches and plastics like Ultradur, Xantar, Zytel, Grivory etc from what I understand do pretty well.

Initially, nylon based polymers looked good. But we have had a few issues with getting the exact characteristics we want out of the plastic. Any suggestions or pointers in any other directions would be greatly appreciated!

Thanks in advance

RE: Plastic selection query

These guys are extremely helpful when developing projects that involve plastics:


They've been around for over 40 years and know everyone in the business. I've asked them to help get pointed in the right direction for information, costs, etc. related to plastic product information. Very helpful.

RE: Plastic selection query

Have a look at PBT - better chemical and UV than Nylons (although Grivory is a PPA/PA blend which will be good too).
Many manufacturers of PBT and all it's various grades.



It's ok to soar like an eagle, but weasels don't get sucked into jet engines.

RE: Plastic selection query

Cheers for the responses guys.

Have tentatively looked at PBT (specifically the Crastin range) and its looks excellent. Possibly falls down on the UV stability when adding flammability requirements into the mix. Its just a matter of trawling through numerous datasheets and contacting suppliers at this stage.

Another question I have regarding surface finishes of plastic parts. I am looking at Makroblend as a possible solution however I am looking for a matte finish as opposed to gloss. Are there any good reference sites for looking at the different surface finishing techniques? Any common polymer specific processes for finishing of the parts to achieve desired characteristics?


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!


White Paper - The State of Product Development and Hardware Design 2019
The most successful companies are usually the ones that never rest. They are always striving to get better, to deliver more innovative products and get them to market faster. Onshape surveyed 850 product design and manufacturing pros to learn what techniques and strategies they’ve employed to keep ahead of their competition and in this white paper their answers are distilled. Download Now
Research Report - Mass Customization Placing Design in the Customers Hands
Products come in all shapes and sizes, and customers demand solutions tailored to their needs. With mass customization software, these two facts can be reconciled in an automated, customer-facing experience called a product configurator. In this engineering.com research report, we examine the different levels of mass customization with the pyramid of product configurators. Taking a look at real-world case studies, we discover how the highest level of the pyramid can enable true engineering automation, saving time and increasing customer satisfaction. Download Now
Research Report - Test and Simulation Survey
We at engineering.com continually hear how engineers and designers will be doing simulation, such as FEA and CFD, and that they will be doing it early in the design cycle. Is this wishful thinking? We found out what it is really like in industry. Read more now. Download Now

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