Spray Equipment Transfer Efficiency

Various coating source specific rules in the SCAQMD Rules and Regulations require coatings and adhesives to be applied by specified methods such as electrostatic spray, high-volume, low-pressure (HVLP) spray, roll coater, flow coater, dip coater, etc. in order to maximize the transfer efficiency. Transfer efficiency is typically defined as the ratio of the weight of coating solids adhering to an object to the total weight of coating solids used in the application process, expressed as a percentage. When it comes to spray applications, the rules typically require the use of either electrostatic spray equipment or HVLP spray equipment. Other coating application methods that have been demonstrated to the SCAQMD to be capable of achieving either 65 percent transfer efficiency or equivalent or better transfer efficiency than HVLP spray equipment (depending on the source specific rule) can also be used after the Executive Officer has given written approval. 

Transfer Efficiency Test Methods

The SCAQMD has developed two documents to assist individuals who want to qualify their spray guns as being capable of achieving 65 percent transfer efficiency or as having equivalent or better transfer efficiency than HVLP spray equipment. Prior to conducting any transfer efficiency testing, a test protocol must be prepared, submitted to the SCAQMD with a Plan Application, and approved by the SCAQMD.

Test Methods for Spray Gun Manufacturers

Spray gun manufacturers who want to demonstrate that their spray gun is equivalent to HVLP spray equipment must use both the test procedure and the equivalency demonstration guidelines below to demonstrate equivalency.

Guidelines for Demonstrating Equivalency with District Approved Transfer Efficient Spray Guns (PDF, 52kb)

Spray Equipment Transfer Efficiency Test Procedure for Equipment User (PDF, 62kb)

Test Methods for Equipment Users

Equipment users who want to demonstrate that a spray gun is capable of achieving 65 percent transfer efficiency or is equivalent to or better than HVLP must use this document only.

Spray Equipment Transfer Efficiency Test Procedure for Equipment User (PDF, 62kb)

Approval Letters for Spray Guns Deemed Equivalent to HVLP

SATAjet 5000 B RP Revised Approval Letterr (October 16, 2015 (PDF, 565kb)
SATAminijet 4400 B RP Approval Letter (October 16, 2015 (PDF, 567kb)
Satajet 3000 B RP Alternative Approval (July 20, 2010) (PDF, 381kb)
Satajet 3000 B RP Alternative Approval (July 21, 2009) (PDF, 348kb)
ITW DeVilbiss Alternative Approval (Jun 2, 2009) (PDF, 333kb)
ANEST IWATA (Feb 26, 2009) (PDF, 21kb)  
CVI DeVilbiss (Dec 9, 2008) (PDF, 12.7kb)
GTI Pro DeVilbiss (Dec 9, 2008) (PDF, 12.6kb)
ITW Techna (Dec 9, 2008) (PDF, 12.6kb)
SATA Jet3000 (Aug 23, 2006) (PDF, 21.5kb)
Graco/3M (Jan 21, 2005) (PDF, 20kb)
SATA (Nov 25, 2003) (PDF, 21.5kb)
ITW DeVilbiss (Aug 9, 2002) (PDF, 20.5kb)