Applications

HumiSeal® 1A33 – Urethane Conformal Coating for PCB Protection

– Item Name: HumiSeal® 1A33
– Manufacturer: HumiSeal
– Technologies: Single-component polyurethane conformal coating
– Color: Fluoresces under UV light
– Certifications: MIL-I-46058C, IPC-CC-830B, RoHS Directive 2011/65/EC, UL File Number E105698
– Cure Type: 30 days at RT, 30 hours at 76°C, or 20 hours at 88°C
– Package Size: Contact Avantek for details.
– Shelf Life: 24 months

1. Product Overview

HumiSeal® 1A33 is a single-component, polyurethane conformal coating designed for general PCB applications. It contains no free isocyanates, fluoresces under UV light for inspection, and complies with MIL-I-46058C, IPC-CC-830B, UL (E105698), and RoHS Directive 2011/65/EC.

2. Applications

  • Protects printed circuit boards from environmental factors
  • Used in electronics where moisture resistance and electrical insulation are critical
  • Applied via dipping, spraying, or brushing

3. Typical Properties

Property Value
Density (ASTM D1475) 0.95 ± 0.02 g/cm³
Solids Content (Fed-Std-141, Meth. 4044) 44 ± 2%
Viscosity (Fed-Std-141, Meth. 4287) 180 ± 20 centipoise
VOC 531 g/L
Recommended Coating Thickness 25 – 75 microns
Drying Time to Handle (Fed-Std-141, Meth. 4061) 15 minutes
Curing Conditions for Optimum Properties 30 days at RT / 30h @ 76°C / 20h @ 88°C
Thermal Shock (MIL-I-46058C) -65°C to 125°C
Glass Transition Temperature (DSC) 26°C
Coefficient of Thermal Expansion (TMA) 193 ppm/°C
Modulus (DMA) 27.2 MPa
Flammability (UL 94) V-0
Dielectric Withstand Voltage (MIL-I-46058C) >1500 volts
Dielectric Breakdown Voltage (ASTM D149) 7500 volts
Dielectric Constant (1MHz, 25°C) (ASTM D150-98) 3.6
Dissipation Factor (1MHz, 25°C) (ASTM D150-98) 0.03
Insulation Resistance (MIL-I-46058C) 2.0 × 10¹⁴ ohms (200TΩ)
Moisture Insulation Resistance (MIL-I-46058C) 1.6 × 10¹⁰ ohms (16GΩ)
CTI, PLC (UL746E @ 600V) 0
Fungus Resistance (ASTM G21) Passes

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