Applications

HumiSeal® 1A27 – Urethane Conformal Coating

  • Item Name: HumiSeal® 1A27
  • Manufacturer: HumiSeal
  • Technology: Single-component polyurethane conformal coating (no free isocyanates)
  • 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 Techniq VN for details
  • Shelf Life: 24 months

1. Product Overview

HumiSeal® 1A27 is a single-component polyurethane conformal coating designed for printed circuit boards. It is free of isocyanates, RoHS compliant, and UL recognized (File No. E105698).

2. Applications

  • Protection of electronic assemblies and PCBs
  • Applied via dipping, spraying, or brushing

3. Typical Properties

Property Value
Density (ASTM D1475) 0.96 ± 0.02 g/cm³
Solids Content 50 ± 3%
Viscosity 3000 ± 1000 cP
VOC 480 g/L
Recommended Coating Thickness 25 – 75 µm
Drying Time to Handle 30 min
Full Cure Options 30 days @ RT, 30 hrs @ 76°C, 20 hrs @ 88°C
Thermal Shock Resistance -65°C to 125°C
CTE (TMA) 170 ppm/°C
Glass Transition Temperature (Tg) 28°C
Modulus (DMA) 18.1 MPa
Flammability (UL 94) V-0
Dielectric Withstand Voltage >1500 V
Dielectric Breakdown Voltage 7500 V
Dielectric Constant (1MHz, 25°C) 3.6
Dissipation Factor (1MHz, 25°C) 0.02
Insulation Resistance 2.0 x 10¹⁴ Ω (200TΩ)
Moisture Insulation Resistance 1.2 x 10¹⁰ Ω (12GΩ)

4. Application Methods

  • Dipping: Use HumiSeal® Thinner 521 to adjust viscosity, control immersion/withdrawal rate (5-15 cm/min).
  • Spraying: Mix with HumiSeal® Thinner 521 (1:1 ratio). Ensure adequate ventilation.
  • Brushing: Small addition of HumiSeal® Thinner 521 recommended for even coating.

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