topic 26699 p2
Industry specs for powder coating thickness and testing methods? p.2
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A discussion started in 2004 but continuing through 2019December 11, 2014
Q. I plan to buy / get manufactured 50 (hospital type) steel beds in 14 gauge (approx. 1.8 to 2 mm thk.) CRCA pipe sections to donate to an old age home. We plan to get them white powder coated. Kindly advise recommended thickness for reasonable durability (say to last 10 to 15 years). Would 50 micron be okay? How to easily check?Anupam Suri
Retired - Gurgaon, Haryana, India
December 28, 2014
Q. Is there any mathematical relation between the powder coating thickness and other input parameters such as dryer temperature, main furnace temperature and conveyor velocity. I want to know how those input value can be identified for particular coating thickness?kannan paramasivan
park - coimbatore, tamilnadu, india
December 31, 2014
A. There's not much relationship between those factors and coating thickness, though conveyor speed has some impact, but only where a conveyor is used (not all powder coating is done with a conveyor).
Varying the curing temperature doesn't change the thickness.
If you wish to change thickness of the coating, try varying gun parameters.
galvanizing & powder coating shop
January 8, 2015
A. Well, this item is usually referred to as a "cure schedule".
Essentially it means time at metal temperature and is usually represented graphically.
There is very little change with varying coating thickness.
Hope this helps.
Trainer - Newcastle, NSW Australia
Thickness range for structured powder coatingNovember 4, 2015
DFT = Dry Film Thickness
Q. I am facing problem in structure finish powder coating for DFT it is Low range is 60 and high range is 180. Please tell me what is low and high dry film thickness variation in structure finish powder coating.L M Jadhav
Powder Coating - Mumbai India
A. Hi L M. When you say "structure finish", my understanding is that you are referring to what we call "texture finish" in the USA. Unfortunately, I'm not fully sure what your question is. You mention DFT of 60 to 180, presumably microns (1-1/2 to 4-1/2 mils)...
If you are asking whether that 3:1 range an acceptable variation, we'll have to wait for an expert with experience in structured coatings to chime in, but meanwhile my understanding is that the answer is "No" -- i.e., that for structure you will need a reliable minimum thickness of 75-80 microns, and that going much over 120 microns will be an invitation for orange peel. The powder vendor's technical data sheet probably has a suggested DFT range.
Ted Mooney, P.E. RET
Pine Beach, New Jersey
Striving to live "Aloha"
April 20, 2016
I have to send my fabricated mild steel perforated 200 mm x 40 mm x 2 mm thick display board for powder coating ( polyester/ TGIC resin). So, how much thickness required for it? Please reply as soon as possible.
the equestrian club - riyadh, saudi arabia
April 21, 2016
A. TGIC resin polyester powders are normally coated at 60-80 microns.
If you are applying a Pb free Yellow / Orange /Red it might be advisable to knock this up to 80-100 microns for opacity.
Much above this could lead to Orange Peel.
Hope this helps,
Trainer - Salamander Bay, Australia
July 17, 2017
Q. I am going to develop some CRCA items for Water Heater which should pass the 200 hours salt spray test, so how much should I keep the powder coating thickness of that part?ANIL BALBUDHE
Haier Appliances India Pvt Ltd Pune - Pune, Maharashtra, India
March 18, 2018
Q. Kindly share if possible the standardized procedure for powder coating of MS Pipes MeHashir Mehmood
December 5, 2018
Q. Hello sir,
How to check powder coating thickness by using METRAVI CTG-01 coating thickness tester.
And how much powder coating thickness require to mild steel sheet of thickness 16 gauge, 18 gauge, 2mm.
- Pune, Maharastra, India
A. Hi Shrikant. The thickness depends on the type of powder (for example polyester thermoset vs. nylon thermoplastic); and the minimum thickness may be specified by the application, but as you've read on this page several times, typical polyester thicknesses are 30 to maybe as much as 80 microns.
You have to get operating instructions for a particular brand of thickness tester from its supplier. But the operating manual for the unit in question appears to be available on the web at http://www.metravi.com/PDF2/CTG-01.pdf
Pine Beach, New Jersey
Striving to live "Aloha"
December 25, 2018
A. The thickness is depends upon various factors like application method, use of the parts, chemistry of powders etc. But normally we can say the thickness 30-80 microns.
- Malur, Karnataka
April 12, 2019
Q. If standard powder coating thickness is averaging from 60 to 80 microns. Is there a standard thickness for superdurable Powder coating or PVDF powder coating? how many microns for both?James Taduran
Dalkia Incorporated - Pasig City, Philippines
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