Applications

HumiSeal® 2A64 – Urethane Conformal Coating – Electronics Protection

  • Item Name: HumiSeal® 2A64
  • Manufacturer: HumiSeal
  • Technology: Two-component polyurethane conformal coating
  • Color: Fluoresces under UV light for inspection
  • Cure Type: 3 hours at 76°C
  • Package Size: Contact Avantek for details
  • Shelf Life: 12 months

1. Product Overview

HumiSeal® 2A64 is a two-component polyurethane conformal coating designed for general printed circuit board (PCB) applications. It is characterized by high solids content, low viscosity for easy application, and UV fluorescence for inspection. The coating meets MIL-I-46058C, IPC-CC-830, and RoHS Directive 2011/65/EC compliance standards.


2. Applications

  • Protection of electronic assemblies and PCBs
  • Used in environments requiring chemical and moisture resistance
  • Ideal for applications needing fast drying and easy processing
  • Compatible with brushing, dipping, and spraying application methods

3. Typical Properties

Before Mixing (Parts A & B)

Property Value
Mixing Ratio (A:B) 1:1 by volume
Pot Life at Room Temperature 8 hours
Shelf Life at Room Temperature 12 months
Recommended Thinner HumiSeal® Thinner 64
Recommended Stripper HumiSeal® Stripper 1072

After Mixing

Property Value
Density 1.07 ± 0.03 g/cm³
Solids Content 55 ± 5%
Viscosity 130 ± 50 cP
VOC 501 g/L
Recommended Coating Thickness 25 – 75 µm
Drying Time to Handle 15 minutes
Curing Condition 3 hrs @ 76°C

After Curing

Property Value
Thermal Shock Resistance -65°C to 125°C
Coefficient of Thermal Expansion 82 ppm/°C (Below Tg), 255 ppm/°C (Above Tg)
Glass Transition Temperature (Tg) 12°C
Modulus (DMA) 4101 MPa @ -40ºC, 2777 MPa @ 25ºC, 2 MPa @ 80ºC
Flammability Self-Extinguishing
Dielectric Withstand Voltage >1500V
Dielectric Breakdown Voltage 3500V
Dielectric Constant (1MHz, 25°C) 3.5
Dissipation Factor (1MHz, 25°C) 0.024
Insulation Resistance 4.5 x 10¹⁴ Ω
Moisture Insulation Resistance 4.8 x 10¹⁰ Ω
Fungus Resistance Passes

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