Applications

HumiSeal® 1A20R – Urethane Conformal Coating – Chemically Resistant, Fast Curing Coating

Item Name: HumiSeal® 1A20R
Manufacturer: HumiSeal
Technologies: Single-component, chemically resistant urethane conformal coating
Color: Not specified
Cure Type:

  • 24 hours at room temperature
  • 3 hours at 76°C
  • 7 days to reach optimum properties
    Package Size: Contact to Avantek for details.
    Shelf Life: 12 months

1. Product Overview

HumiSeal® 1A20R is a single-component, chemically resistant, fast-curing polyurethane conformal coating. It fluoresces under UV light for easy inspection and meets MIL-I-46058C, IPC-CC-830, and RoHS Directive 2002/95/EC compliance. It provides excellent protection against moisture, chemicals, and environmental stress.


2. Applications

  • Protection of printed circuit boards (PCBs) from moisture, contaminants, and harsh environments.
  • Suitable for dipping, spraying, and brushing applications.
  • Compatible with no-clean flux but should be tested for compatibility.
  • Should be applied in environments where relative humidity (RH) is ≤ 60% to prevent bubble formation.

3. Typical Properties

Before Mixing (As Supplied)

Property Value Test Method
Density 1.02 ± 0.02 g/cm³ ASTM D1475
Solids Content 50 ± 3 % Fed-Std-141, Meth. 4044
Viscosity 100 ± 30 centipoise Fed-Std-141, Meth. 4287
VOC Content 511 g/L
Shelf Life at Room Temperature 12 months

After Mixing (Cured Properties)

Property Value Test Method
Recommended Coating Thickness 25 – 75 microns
Drying Time to Handle 60 minutes Fed-Std-141, Meth. 4061
Recommended Curing Conditions 24 hrs @ RT or 3 hrs @ 76°C
Time to Reach Optimum Properties 7 days
Thermal Shock Resistance -65°C to 125°C MIL-I-46058C
Coefficient of Thermal Expansion 515 ppm/°C TMA
Glass Transition Temperature (Tg) 71°C DSC
Modulus 89.6 MPa DMA
Dielectric Withstand Voltage >1500 volts MIL-I-46058C
Dielectric Constant (1MHz, 25°C) 3.5 ASTM D150-98
Dissipation Factor (1MHz, 25°C) 0.028 ASTM D150-98
Insulation Resistance 3.0 x 10¹⁴ ohms (300TΩ) MIL-I-46058C
Moisture Insulation Resistance 4.8 x 10¹⁰ ohms (48GΩ) MIL-I-46058C
Fungus Resistance Passes ASTM G21
Chemical Resistance Excellent

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