Humiseal UV40-250 UV Curable Conformal Coating

HumiSeal UV40-250 conformal coating is:

• single component
• high solids
• UV curable
• acrylated polyurethane

HumiSeal UV40-250 conformal coating has:

• excellent chemical resistance, surface hardness, flexibility, and moisture resistance.
• secondary moisture cure mechanism for curing in the non-UV exposed shadowed areas
• fluoresces under UV light to allow for coating inspection
• can be applied by selective coating equipment.
• recognized under UL File Number E105698
• MIL-I-46058C qualified
• IPC-CC-830 and RoHS Directive 2015/863/EU
• China Standard GB30981-2020

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.

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.