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Pre heat before powder coating

(-----) January 30, 2008

During powder coating process, after seven tank process, We have a practice of pre heating the phosphated materials. The basic material we used is CRCS. Please let us Know is this is a right methed. If it is right, what are the advantages and are there any standards available for this.?

uday Kumar
Quality engineer - Bangalore, Karnataka, India

First of two simultaneous responses -- January 31, 2008

If you are not having any quality issues then it is right. You can make the process documentation as easy or as complicated as you want. Everyone that follows the method you are using does it differently. The only note that I would add is that you do not have to heat a substrate before powder coating, the paint should adhere cold and cure just fine providing that your equipment is adequate.

Sheldon Taylor
Sheldon Taylor
supply chain electronics
Wake Forest, North Carolina


Second of two simultaneous responses -- January 31, 2008

IF your powder vendor is reputable, they are your best source of information like this. Their tech service has gone thru this many times before your questions.

James Watts
- Navarre, Florida

February 1, 2008

You didn't say which phosphate (Iron, Zinc...?)
You'd need to dry the substrate before coating, is this waht you mean? If you powder spray hot material you'll get an overthick coating. Partial curing before actual oven curing.
Hard to answer without the description of the rest of your process.

Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK
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