Contact US

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

Teflon coating of the immersion heater (12V 600W)

Teflon coating of the immersion heater (12V 600W)

Teflon coating of the immersion heater (12V 600W)


I need to teflon coat the heating element (made from stainless steel) of the immersion heater.
I have came across many techniques in the internet of Teflon coating.
Could anyone point on the simplest method of the in house teflon coating?
Please help

RE: Teflon coating of the immersion heater (12V 600W)

It sounds like you bought a stainless steel heater and then found out that stainless steel isn't compatible with your process conditions due to the risk of corrosion/cracking etc. So now you want to "paint" on a Teflon coating to solve the problem.

This isn't likely an "in house" job, and it's not entirely certain that you can do it on a post-manufactured article like an immersion heater. You can't produce a holiday-free coating of a fluoropolymer which is suitable for hot immersion service by painting on a coating out of a can- it's a process which generally involves the application of material in thin layers with fairly high temperature baking steps in-between coats. Those steps will likely destroy the epoxy potting which is typically used to cap the cold ends of immersion heater elements after the electrical terminals are attached.

The watt density of a teflon-coated 600 W heater would need to be very low or it would need to be used under conditions of excellent exterior heat transfer to have the coating survive in corrosion service for any appreciable period.

The geometry of an immersion heater is also a potential problem, making a uniform coating without voids or holidays very difficult to achieve and to verify. At 600 W, your heater probably has an NPT fitting on it, and coating the exterior of male NPT threads with a corrosion-resistant coating is a failure waiting to happen.

The alternative to coatings which is typically used is to encapsulate individual heating elements with PFA tubing or the like. An example is here:


Heaters like this are used in severely corrosive aqueous solutions such as plating baths.

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


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