HUMISEAL HumiSeal 1B31EPA (5-LTR-CAN)

HumiSeal® 1B31EPA

Overview

HumiSeal® 1B31EPA Acrylic Conformal Coating is a fast-drying, single-component acrylic coating designed to provide excellent moisture and environmental protection for printed circuit assemblies (PCAs). The coating delivers outstanding flexibility, electrical insulation properties, and long-term protection against harsh operating environments. It fluoresces under UV light to support inspection processes and can be easily repaired during maintenance operations.

HumiSeal® 1B31EPA is available as both standard and pre-blended formulations, offering multiple viscosity options for spray, dip, and brush application methods.

Key Technical Specs

• Product Type: Single-component acrylic conformal coating
• Colour: Clear coating with UV fluorescent inspection capability
• Solids Content: 28 ± 3% by weight
• Density: 0.95 ± 0.03 g/cm³
• Viscosity: 325 ± 60 centipoise
• VOC Content: 684 g/L
• Recommended Coating Thickness: 25-75 microns
• Drying Time to Handle: Approx. 30 minutes
• Full Cure: 24 hours at room temperature or 30 minutes at 76°C
• Optimum Properties: Achieved after approximately 7 days
• Shelf Life: 24 months at room temperature

Approvals & Specifications

• MIL-I-46058C qualified
• IPC-CC-830 compliant
• RoHS Directive 2011/65/EC compliant
• EPA 33/50 compliant
• Passes ASTM G21 fungus resistance testing

Electrical & Environmental Performance

• Thermal shock resistance: 50 cycles from -65°C to 125°C
• Flammability: Self-extinguishing according to MIL-I-46058C
• Dielectric withstand voltage: >1500 volts
• Dielectric breakdown voltage: 6300 volts
• Dielectric constant: 2.6 at 1 MHz and 25°C
• Dissipation factor: 0.01 at 1 MHz and 25°C
• Insulation resistance: 5.5 � 10¹? ohms
• Moisture insulation resistance: 7.0 � 10¹? ohms

Typical Applications

• Protection of aircraft electronic assemblies and printed circuit boards
• Aerospace avionics protection against moisture and environmental contamination
• Electronic control units and electrical assemblies
• Applications requiring flexible, repairable conformal coatings
• High reliability electronics operating in demanding environments

Application & Processing

• Ensure substrate is clean, dry, and free from moisture, dirt, grease, wax, and contaminants
• Can be applied by dipping, spraying, or brushing
• For dip application, immersion and withdrawal rates of 5-15 cm/min are recommended
• Spray application requires adequate ventilation to remove vapours and mist
• Typical spray dilution ratio: 1:1 with HumiSeal® Thinner 600 or 604 (adjust as required)
• Viscosity should be monitored during application to maintain consistent coating thickness

Compatibility & Safety Notes

• Suitable for use over many electronic assemblies and substrates
• Compatibility testing recommended when applied over no-clean flux residues
• Flammable solvents are present-avoid flames, sparks, and ignition sources
• Use only in well-ventilated areas
• Avoid skin and eye contact
• Refer to Safety Data Sheet (SDS/MSDS) before use

Packaging & Procurement

• Available in multiple viscosity formulations:
• HumiSeal® 1B31EPA: 265-385 cps
• 1B31EPA/600: 60-70 cps
• 1B31EPA/604 PB35 CPS: 30-40 cps
• Recommended thinners:
• HumiSeal® Thinner 600 for spraying
• HumiSeal® Thinner 604 for dipping and brushing
• Recommended stripper: HumiSeal® Stripper 1080

Why This Product is Chosen for AOG / MRO

• Provides reliable protection for sensitive avionics and electronic assemblies
• Fast drying characteristics support efficient maintenance turnaround
• UV fluorescent properties allow easy inspection and quality control
• Repairable coating simplifies component maintenance
• Excellent flexibility reduces cracking during thermal cycling and vibration

Practical Suggestions for Your Team (AOG Mindset)

• Ensure assemblies are completely clean and dry before coating application
• Verify compatibility when coating over existing flux residues or protective layers
• Control viscosity carefully during spray and dip processes
• Maintain adequate ventilation during application due to solvent vapours
• Allow full curing time before electrical testing or return to service
• Use UV inspection capability as part of coating quality checks

Manufacturer / Aviation Spec Codes

• Product Name: HumiSeal® 1B31EPA
• Product Type: Acrylic conformal coating
• Specifications: MIL-I-46058C / IPC-CC-830
• Application: Aerospace and electronic assembly environmental protection