HUMISEAL HumiSeal 1C55 (1-LTR-CAN)

HumiSeal® 1B73EPA Acrylic Conformal Coating

Overview

HumiSeal® 1B73EPA is a fast-drying, single-component acrylic conformal coating designed for protection of printed circuit assemblies (PCAs). The coating provides excellent flexibility, electrical insulation performance, and environmental protection while offering UV fluorescence for easy inspection. It is easily repairable and is qualified for aerospace, defence, and electronic manufacturing applications requiring reliable protection against moisture, contamination, and thermal cycling.

Key Technical Specs

• Product Type: Single-component acrylic conformal coating
• Appearance: Clear coating with UV fluorescent inspection capability
• Density: 0.96 ± 0.03 g/cm³
• Solids Content: 23 ± 3% by weight
• Viscosity: 230 ± 30 centipoise
• VOC Content: 739 g/L
• Recommended Film Thickness: 25-75 microns
• Handling Dry Time: Approximately 30 minutes
• Full Cure: 24 hours at room temperature or 60 minutes at 76°C
• Optimum Properties: Achieved after 7 days
• Shelf Life: 24 months at room temperature

Approvals & Specifications

• MIL-I-46058C qualified
• IPC-CC-830 compliant
• RoHS Directive 2011/65/EU compliant
• EPA 33/50 compliant
• Recognised under UL File Number E105698
• UL 94 V-0 flammability rating

Typical Applications

• Printed circuit board assemblies (PCB/PCBA)
• Aerospace electronic assemblies
• Defence and high-reliability electronic systems
• Protection against moisture, dust, chemicals, and environmental contamination
• Electronic assemblies requiring inspection under UV light

Application Methods

• Dipping:
  • May require thinning with HumiSeal® Thinner 600 depending on assembly complexity
  • Recommended immersion and withdrawal speed: 5-15 cm/min
  • Monitor viscosity regularly using Zahn or Ford viscosity cups
• Spraying:
  • Compatible with conventional spray equipment
  • Requires adequate ventilation during application
  • Typical thinner ratio: 1:1 by volume with HumiSeal® Thinner 600
  • Adjust thinner ratio and spray pressure to achieve uniform coating
• Brushing:
  • Can be applied by brush with small additions of HumiSeal® Thinner 600
  • Film consistency depends on component density and application technique

Compatibility & Safety Notes

• Apply only to clean and contamination-free substrates
• Compatible testing should be performed with specific assembly materials and processes
• Use only in well-ventilated areas
• Coating solvents are flammable-keep away from sparks and open flames
• Avoid skin and eye contact
• Refer to Safety Data Sheet (SDS) before use

Storage & Packaging

• Store in tightly closed containers away from excessive heat or cold
• Recommended storage temperature: 0-35°C
• Allow product to stabilise for 24 hours at 18-32°C before use

Why This Product is Chosen for AOG / MRO

• Provides reliable protection for critical electronic assemblies
• UV fluorescence enables rapid inspection and quality control
• Flexible coating accommodates thermal expansion and vibration
• Easy repairability reduces maintenance downtime
• Meets recognised aerospace and electronics protection standards

Practical Suggestions for Your Team (AOG Mindset)

• Ensure boards are thoroughly cleaned and dry before coating
• Control coating thickness carefully to maintain electrical performance
• Monitor viscosity during dipping operations
• Use correct thinner ratios to avoid pinholes or uneven coverage
• Allow full cure before returning electronic assemblies to service

Manufacturer / Aviation Spec Codes

• Product Name: HumiSeal® 1B73EPA
• Product Type: Acrylic conformal coating
• Specifications: MIL-I-46058C / IPC-CC-830
• Application: Printed circuit assembly protection
• Recommended Thinner: HumiSeal® Thinner 600
• Recommended Stripper: HumiSeal® Stripper 1080 / 1080A