Application of UV40-250 Conformal Coating

Conformal coatings can be successfully applied to substrates that have been cleaned prior to coating and also to substrates assembled with low residue, “no clean” assembly materials. Users should perform adequate testing to confirm compatibility between the conformal coating and their particular assembly materials, process conditions and cleanliness level. Please contact HumiSeal^® for additional information.

Spraying
HumiSeal^® UV40-250 can be applied via standard selective coating equipment or by conventional hand spray equipment. The source air used for spraying must be dry (a dry inert gas is highly recommended) to prevent premature curing of the secondary cure mechanism.  The spraying should be done with adequate ventilation so that the vapor and mist are carried away from the operator. 

Brushing
HumiSeal^® UV40-250 may be applied by brush for rework or touch up only. Brush must be cleaned with solvent promptly after use.

Clean Up
To flush equipment and clean uncured HumiSeal^® UV40-250, non-alcohol-based solvents should be used. HumiSeal^® Thinner 521 or Thinner 521EU is recommended.

Rework
HumiSeal^® UV40-250 is a highly cross-linked UV cured coating.  The cured film has a high degree of environmental and chemical resistance and will be more difficult to remove than traditional conformal coatings.  Thermal displacement, mechanical abrasion and, where available, HumiSeal^® Stripper 1100 are suitable options for rework of HumiSeal^® UV40-250.