Paint Spray Guns

Transfer Efficiency

TRANSFER EFFICIENCY

Transfer efficiency (T.E.)  is expressed as a simple ratio:

Transfer Efficiency (T.E.) =         Wt. of solid coating deposited on part (lbs)         

  Wt. of solid coating used during the application (lbs)

Weight of solid coating used during the application (g) is the amount of solid coating that is issued from the spray gun or other application device during the process. Since the application device uses liquid rather than solid coating, this value can be calculated from the following equation:

Wt. of Solid coating (g) = Wt. liquid coating x Wt. Solids (%)

100

It is relatively easy to determine the weight of solid coating deposited and weight of liquid coating used.  However, to determine the percent weight of solids in the coating, a laboratory analysis must be performed.  The analysis is simple to carry out, but the results of a transfer efficiency calculation are extremely sensitive to the accuracy of the laboratory analysis.  In fact, it is critical that the laboratory analysis be performed on the exact same coating that is used during the transfer efficiency test.  It is strongly recommended that the vendor=s literature on percent weight solids not be used!  Even a small error between the vendor=s value and the laboratory analysis can result in an erroneous transfer efficiency calculation!

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