Humiseal UV40 UV Curable Conformal Coating

HumiSeal UV40 is a single component, high solids, UV curable, acrylated polyurethane conformal coating that possesses excellent chemical resistance, surface hardness, flexibility and moisture resistance. The material is tackfree after exposure to UV light. A secondary moisture cure mechanism will cure unexposed areas of the coating within 2-3 days at ambient conditions. The coating fluoresces under UV light to allow for coating inspection and can be applied by selective coating equipment. HumiSeal UV40 coating is recognized under UL File Number E105698, and is MIL-I-46058C qualified, and IPC-CC-830 and RoHS Directive 2011/65/EC compliant.

• 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
• RoHS directive 2015/863/EU
• China Standard GB30981-2020
• ISO 10993-5 certified product

Application of UV40 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 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 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, non-alcohol based solvents should be used. HumiSeal Thinner 521 or Thinner 521EU is recommended.

Rework
HumiSeal UV40 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.