Applications

HumiSeal® 1A68 – Urethane Conformal Coating – Electronics Protection

  • Item Name: HumiSeal® 1A68
  • Manufacturer: HumiSeal
  • Technology: Single-component polyurethane conformal coating
  • Color: Fluoresces under UV light for inspection
  • Cure Type:
    • 30 days at room temperature
    • 30 hours at 76°C
    • 20 hours at 88°C
  • Package Size: Contact Avantek for details
  • Shelf Life: 24 months

1. Product Overview

HumiSeal® 1A68 is a single-component polyurethane conformal coating designed for general PCB applications. It is free from isocyanates, fluoresces under UV light for inspection, and meets IPC-CC-830 and RoHS Directive 2002/95/EC compliance. It is also UL recognized under File Number E105698.

2. Applications

  • Protection of printed circuit boards (PCBs)
  • Suitable for dipping, spraying, or brushing application
  • Used where moisture and electrical insulation resistance are required

3. Typical Properties

Property Value Test Standard
Density 0.95 ± 0.02 g/cm³ ASTM D1475
Solids Content 44 ± 2 % Fed-Std-141, Meth. 4044
Viscosity 180 ± 20 centipoise Fed-Std-141, Meth. 4287
VOC 521 g/L
Recommended Coating Thickness 25 – 75 microns
Drying Time to Handle 15 minutes Fed-Std-141, Meth. 4061
Curing Time 30 days (RT), 30h @ 76°C, 20h @ 88°C
Thermal Shock -65°C to 125°C MIL-I-46058C
Coefficient of Thermal Expansion (TMA) 193 ppm/°C
Glass Transition Temperature (Tg) 26°C DSC
Modulus 27.2 MPa DMA
Flammability V-0 UL 94
Dielectric Withstand Voltage >1500 volts MIL-I-46058C
Dielectric Breakdown Voltage 7500 volts ASTM D149
Dielectric Constant (1MHz, 25°C) 3.6 ASTM D150-98
Dissipation Factor (1MHz, 25°C) 0.03 ASTM D150-98
Insulation Resistance 2.0 x 10¹⁴ ohms (200TΩ) MIL-I-46058C
Moisture Insulation Resistance 1.6 x 10¹⁰ ohms (16GΩ) MIL-I-46058C
CTI (Comparative Tracking Index) 0 PLC (600V) UL746E
Fungus Resistance Passes ASTM G21

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