×
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!

*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

GE Lexan 943A Resin & HP92W Film _ Anti-static solution(s)!

GE Lexan 943A Resin & HP92W Film _ Anti-static solution(s)!

GE Lexan 943A Resin & HP92W Film _ Anti-static solution(s)!

(OP)
I need a to locate a spray or coating that can be used on both GE Lexan 943A-116 [use: Inj-molded plastic cover that features an LCD viewing window for an industrial control] & GE HP92W 7mm thick film [use: top {external} material layer of domed membrane keypad]. The product is intended for use in a Class I, hazardous location, indoor or outdoor, where washdown solvents, harsh environmental conditions (e.g., UV light, petroleum based products, salt spray, etc..)are common. It must be a clear, permanent (i.e., abrasion resistant), relatively low cost, anti-static coating. The measured insulation resistance on both the injection-molded Lexan cover & domed membrane Lexan film keypad must not exceed 1 Giga ohm at 23_+/-2 degree C at 50_+/-5% relative humidity.   

I have considered choosing a more conductive grade of Lexan (e.g., carbon or steel filled) for the molded plastic cover. However, there appear to be some significant property and molding trade-offs. Specifically, the clarity and impact strength of the Lexan and increased wear on mold/gating. I want to avoid changing the mold, cycle time, etc.., since we are very late into the project.

I have a list of ~50+ anti static coatings sent to me by GE Plastics {Pittsfield, MA} as possible solutions but am overwhelmed by the volume of this information. I need some direction/feedback from people who perhaps may know of a product or process or have had some experience using something that can meet the above criteria.    

Thank You,
John.

RE: GE Lexan 943A Resin & HP92W Film _ Anti-static solution(s)!

Have you considered vacuum metalising the product? or in-mould painting or evan in-mould films.

These techniques will allow you to maintain the original mechanical properties of your base plastic material.

RE: GE Lexan 943A Resin & HP92W Film _ Anti-static solution(s)!

Hi John - If you are still searching for a solution, I think I have what you are looking for.  Please let me know.  Eric8@andrew.cmu.edu  Also, I'd be interested to find out how you solved, if you've already done so.

Thanks,
Eric

RE: GE Lexan 943A Resin & HP92W Film _ Anti-static solution(s)!

John
I must say that you are a braver man than me if you use Polycarbonate in a hazardous environment when possibly exposed to solvents containing even small amounts of aromatic hydrocarbons
Polycarbonate is really quite sensitive to solvent stress cracking in the presence of many solvents, especially aromatic hydrocarbons.
Compounds containing small quantities of stainless fibre can have very good permanant antistatic properties. Some of these compounds are rated for use in underground mineing.

Contact DSM or LNP for more details

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


Resources

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