Powder coating quality control
Powder coating quality control
(OP)
Guys,
Is there a way to keep the consistency between 2 different powder coating vendors in terms of color and texture?
What are the methods to control the quality during production?
Thanks
C1
Is there a way to keep the consistency between 2 different powder coating vendors in terms of color and texture?
What are the methods to control the quality during production?
Thanks
C1





RE: Powder coating quality control
Also, How the texture finish be specified and measured?
Please help.
Thanks
C1
RE: Powder coating quality control
Like "Finish with Sherwin Williams PES8-C6148 Safety Orange"
Then providing a paint chip or sample and simply talking to both vendors and explaining the situation is the best method.
A color is just a color. Textures/Gloss,etc.. will all cause it to look different from another part of the same color.
RE: Powder coating quality control
There is no question that any approach that you use, short of painting everything yourself with a single batch of paint, can result in both colorimetric and textural differences. No matter what you specify, say, even Federal Standard 595B, color 36320, which is one type of battleship gray, there can rarely be perfect matching, even with the same manufacturer's paint. One possible option is to have the disparate vendors stop prior to powder coat, and send everything to a single vendor for the final finish. Note that a single manufacturer's paint can change over time, when their own internal processing may dictate using different materials or different pigments. Note also, even if colors are matched by colorimeters, that only ensures that the colors match for the conditions imposed during the colorimeter measurement.
TTFN
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RE: Powder coating quality control
I have NEVER had a problem with visual differences between vendors when they use the exact same powder from the same manufacturer.
RE: Powder coating quality control
Here's an article talking about how color variations arose from using different types of curing ovens on the same powder:
http://www.precisionquincy.com/articles/PrecisionQ...
this one has a paragraph on how they control their color:
http://www.btdwoodpowdercoating.com/design-options...
and this one talks about how the color difference is measured and specified:
http://www.colorwiki.com/wiki/Delta_E:_The_Color_D...
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RE: Powder coating quality control
In the world of color and texture, how much of a difference is acceptable varies HUGELY between different applications or inspectors. That's why an actual numerical value is important.
RE: Powder coating quality control
Thank you for sharing these information. Here is what I came across. I saw a product from X-Rite
Link : http://www.colorhq.com/x-rite-SP62-Portable-Spectr...
This is a equipment that can be used to read a color and store all the information about it. It can later compare this to another color and tell how close it its to the original specimen. This is an expensive equipment (~$8000).
Any of you guys know of any other way to compare? or any other equipment that's less expensive.
Thanks
C1
RE: Powder coating quality control
There are cheaper colorimeters out there, in the "few hundred dollars" range. Adequate for some applications. The real professional ones do tend to be around $7000-$8000.
You can also compare color by eye - but it takes a good eye :)
RE: Powder coating quality control
Say for example RAL 8007 & RAL 8011 appear to be same. But in reality they are different.
RE: Powder coating quality control
*I don't use RAL much. I have the US Fed Std 595C color deck on my desk. Yes, I've been looking at and comparing paint colors for a long time. I think my wife is
pickiermore discerning than I am. Painting a wall in my house is an adventureRE: Powder coating quality control
RE: Powder coating quality control
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RE: Powder coating quality control
I'm well aware of the issues with displaying colors on any monitor (heck, RGB monitors can't even show the whole color space the human eye sees) - but for this rough purpose "I can see the difference" a decent LCD monitor is more than adequate.
If you would like to supply the two RAL color cards under discussion, I'd be happy to look at them directly, either under a darn good D65 bulb, an F11 bulb, or using actual indirect natural light through a north window. I'll then use one of those $8,000 colorimeters to give a numerical delta E and will report it.