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!

*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

Epoxy vynilester resin /green color

Epoxy vynilester resin /green color

Epoxy vynilester resin /green color

Hi Group.
My company manufactures pipes and fittings in GFRP using epoxy vynilester resins (Basf, Ashland, Reichold, etc), once the resin is promoted with Cobalt octoate, its color change from clear to purple color, then when the hardener MekP is added, the resins change its color from purple to green. My question is , there is a way to get a hardened vynilester resin in clear color?, maybe changing the Cobalt with DMA?. We do need to coat some products but the green color is not accepted.

Thanks in advance!

RE: Epoxy vynilester resin /green color

Reichold used to offer a pre promoted Vynil ester resin that was a brown amber color It used to turn pale green briefly when MEKP was added , then turn back to a pale amber color when the reaction was complete , Have you also looked at Dow Derokane resin, it also has an amber color when fully cured. Have you tried Cobalt naphthenate instead of the octoate?

You are judged not by what you know, but by what you can do.

RE: Epoxy vynilester resin /green color

Thanks BerkShire, by the way the only resins that we aere using are Reichold Dion 9100, as shown in the picture, this is the resin that we should use. So, it is possible to replace all the cobalt with DMA?

RE: Epoxy vynilester resin /green color

I do not know enough about the chemistry of the resin to answer that, but I do know we were using conap and DMA . If you play around with the promoter accelerator ratios you should do test samples , and check them with a Barcol hardness tester before using them on the product. It sounds like you need to talk with Reichold. Have you tried their 9102 resin?

You are judged not by what you know, but by what you can do.

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! Already a Member? Login


White Paper - Reshoring Prototyping and Production
In this whitepaper, we'll provide insight into why and when it makes sense for U.S. manufacturers to reshore prototyping and production, and how companies can leverage the benefits of working with local design, prototype, and manufacturing partners during the pandemic and beyond. Download Now
Engineering Report - Top 10 Defect Types in Production
This 22-page report from Instrumental identifies the most common production defect types discovered in 2020, showcases trends from 2019 to 2020, and provides insights on how to prevent potential downtime in 2021. Unlike other methods, Instrumental drives correlations between a variety of data sources to help engineers find and fix root causes. Download Now
White Paper - Addressing Tooling and Casting Requirements at the Design Stage
Several of the tooling and casting requirements of a part can be addressed at the design stage. If these requirements are not addressed at the design stage, lot of time is spent in design iteration when the design reaches the die caster. These design issues lead to increase in time and cost of production leading to delay in time to market and reduced profits for the organization. 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