HUMISEAL HumiSeal UV40 (5-LTR-CAN)

HumiSeal® UV40

Overview

HumiSeal® UV40 UV Curable Conformal Coating is a single-component, high-solids, UV-curable acrylated polyurethane conformal coating designed to provide excellent protection for electronic assemblies operating in demanding environments. The coating offers outstanding chemical resistance, moisture protection, flexibility, and surface hardness while allowing rapid curing using UV light systems.

UV40 incorporates a secondary moisture cure mechanism, allowing unexposed shadow areas to fully cure within 2-3 days under ambient conditions. The coating fluoresces under UV inspection lighting, enabling reliable quality control during aerospace and electronics manufacturing processes.

Key Technical Specs

• Product Type: Single-component UV curable acrylated polyurethane conformal coating
• Curing Method: UV light cure with secondary moisture cure mechanism
• Solids Content: Minimum 95%
• Density: 1.10 ± 0.05 g/cm³
• Viscosity: 650 ± 150 centipoise
• Recommended Coating Thickness: 25-125 microns
• Application Thickness Range: 75-130 microns
• Optimum Properties Achieved: 2-3 days after UV cure
• Glass Transition Temperature: 45°C
• Thermal Shock Resistance: 50 cycles from -65°C to +125°C
• Flammability Rating: UL-94 V-0
• Dielectric Withstand Voltage: >1500 volts
• Insulation Resistance: 8.0x10¹? ohms
• Moisture Insulation Resistance: 4.7x10¹? ohms
• Operating Temperature Rating (RTI): 135°C

Approvals & Specifications

• Meets MIL-I-46058C requirements
• Complies with IPC-CC-830
• ISO 10993-5 certified
• UL Recognized - File Number E105698
• RoHS compliant (EU 2015/863)
• REACH compliant
• Compliant with China Standard GB30981-2020

Typical Applications

• Aerospace electronic assemblies
• PCB conformal coating protection
• Electronic control units and avionics equipment
• Applications requiring moisture and chemical resistance
• High reliability electronics operating in harsh environments
• Selective coating and automated coating processes

Performance Characteristics

• Excellent resistance to chemicals and moisture
• High surface hardness with maintained flexibility
• UV fluorescence enables inspection and quality verification
• Rapid tack-free curing using UV equipment
• Secondary moisture cure protects shadow areas
• Compatible with selective coating equipment
• Excellent dielectric insulation properties

Application & Processing

• Apply only to clean substrates free from contamination
• Suitable for selective coating equipment and hand spray application
• Spray air supply must be dry; dry inert gas is recommended
• Ensure adequate ventilation during spraying operations
• Brush application recommended only for repair and touch-up work
• UV curing requires controlled UV dose and irradiance levels
• Shadow areas achieve secondary cure within 2-3 days at ambient conditions

UV Cure Requirements

• Designed primarily for microwave UV ovens equipped with H style bulbs
• Arc UV systems may be used with correct dose and irradiance control
• Typical minimum UV dose:
• UVA: 1.5-2.0 J/cm² depending on equipment
• UVB: 1.5-2.0 J/cm² depending on equipment
• UVC: 0.40 J/cm² minimum
• Final cure performance depends on UV equipment configuration and heat output

Compatibility & Safety Notes

• Store away from direct sunlight and full-spectrum fluorescent lighting
• Moisture sensitive product-protect containers from atmospheric moisture
• Store in tightly closed opaque containers
• Recommended storage temperature: 0-25°C
• Allow product to equilibrate at room temperature for 24 hours before use
• Use dry air, nitrogen, or argon purge for partially used containers
• Use only in well ventilated areas
• Avoid contact with skin and eyes
• Refer to Safety Data Sheet (SDS) before use

Packaging & Procurement

• Supplied as a single-component ready-to-use coating
• Shelf Life: 12 months at room temperature from date of manufacture
• Recommended Stripper: HumiSeal® Stripper 1100
• Recommended Cleaning Solvent: HumiSeal® Thinner 521 or Thinner 521EU

Why This Product is Chosen for AOG / MRO

• Rapid UV curing reduces downtime during electronics repair and manufacturing
• Provides reliable moisture and chemical protection for avionics assemblies
• UV inspection capability improves maintenance quality control
• Excellent dielectric properties support high-reliability aerospace electronics
• Secondary cure mechanism ensures protection in shadowed areas

Practical Suggestions for Your Team (AOG Mindset)

• Confirm UV equipment output before production use
• Maintain controlled coating thickness to avoid incomplete cure
• Ensure substrates are properly cleaned before application
• Use dry air supply during spraying to prevent premature moisture curing
• Allow full secondary cure before exposing assemblies to service conditions
• Store unused material away from light sources and moisture exposure

Manufacturer / Aviation Spec Codes

• Product Name: HumiSeal® UV40
• Product Type: UV curable polyurethane conformal coating
• Specification Compliance: MIL-I-46058C / IPC-CC-830
• Certification: UL Recognized E105698
• Application: Aerospace and electronic assembly protection