The Voice of the Finishing Industry since 1936
Subscribe

# Coverage of Powder

### Share

Q. I would like to know the best method to measure the coverage of a powder in a production line. A local supplier tells me that his powder will cover 14 sq m/ kg, but I need to reproduce this figure in the process line. I appreciate it if you can help me. L.T.

A. Powder materials will cover 192.3 sq ft/lb at 1.0 mil thick with a specific gravity (density compared to water) of 1.0 and 100% utilization (approximately 39.8 sq m/kg). If you factor in the specific gravity, actual film thickness and production efficiency, you will get the real online number.
For example, say the power has a specific gravity of 1.5, you apply an average of 3 mil and you collect the overspray for reuse so your material utilization is around 95%.

39.8 sq m/kg × 0.95 (material utilization) = 37.8 sq m/kg

37.8 ÷ (1.5 SG × 3.0 mil) = 8.4 sq m/kg

If you cut the film thickness to 2.0 mil average, your coverage goes up to 12.6 sq m/kg. If the specific gravity is 1.4, and your thickness is 2.0 mil 13.5 sq m/kg.

You can adjust the input variables and get different results. If you do not reuse overspray, the coverage goes down a lot, and if you apply thicker films it goes down a lot. No one can claim that their powder will cover a certain area without factoring in the variables.

### RELATED CONTENT

• #### Removing Cured Powder Coatings

Question: What methods are available for removing cured powder coatings, and what are the pros and cons of these methods?

• #### Calculating the Cost of Powder Coating

How can you calculate the cost of powder coating a component if you only know its surface area? Powder coating expert Rodger Talbert has the answer.

• #### Understanding Fluidized Bed Powder Coating

For more than 50 years, fluidized beds have been used to coat parts with powder coatings. In this article, two industry experts tackle some common questions about the fluidized bed processâ€¦