HUMISEAL 1A33/521PB65 URETHANE CONFORMAL COATING
Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium
Main features
- 67.5 +/- 2.5 cP Preblend
- Printed-Circuit-Assembly Moisture Protection
- IPC, MIL, and UL Compliance
Product Description
HumiSeal® 1A33/521 PB 65 CPS Urethane Conformal Coating is a single-component polyurethane conformal coating pre-blended to a viscosity suitable for immediate application without additional dilution. Designed for general printed circuit board applications, it provides protection against moisture, salt, corrosive environments, and dirt while maintaining low moisture-vapor permeability. Once fully cured, the pre-blend provides properties equivalent to HumiSeal® 1A33 and supports UV inspection and localized repair. The coating meets MIL-I-46058C, IPC-CC-830B, IEC 60664-3, UL 746E, and UL 94 V-0 requirements and is recognized under UL file E105698.
Key features
- Pre-blended application viscosity: Supplied at 67.5 ± 2.5 cPs for immediate use without additional dilution.
- Environmental protection: Provides protection against moisture, salt, corrosive environments, and dirt with low moisture-vapor permeability.
- Inspection and repair support: Fluoresces under UV light to assist coating inspection and is designed to be repairable.
Applications / Suitable for
- General printed circuit board conformal coating applications
- Protection of electronic assemblies from moisture, salt, corrosive environments, and dirt
- Applications requiring UV-assisted coating inspection
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Thermal Properties
Electrical Properties
Additional Information
As-supplied / before-processing properties
Typical liquid-coating and handling properties for HumiSeal® 1A33/521 PB 65 CPS. Values are not intended for use as specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Product form | Single-component polyurethane conformal coating pre-blend | — | As supplied; no additional dilution required |
| Viscosity | 67.5 ± 2.5 | cPs | Liquid coating |
| Solids content | 40 ± 2 | % | Liquid coating |
| Density | 0.93 ± 0.02 | g/cm³ | Liquid coating |
| VOC | 558.0 | g/L | Liquid coating |
| Drying time to handle | 15 | minutes | Fed-Std-141, Method 4061 |
| Shelf life | 24 | months | From date of manufacture; store tightly closed at 0 to 35°C |
After-processing / final-state properties
Typical fully cured properties shared by HumiSeal® 1A33 and its pre-blends. Values are not intended for use as specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Recommended coating thickness | 25–75 | microns | Cured coating |
| Optional curing conditions to reach optimum properties | 30 days; 30 hours; or 20 hours | — | 30 days at room temperature; 30 hours at 76°C; or 20 hours at 88°C |
| Thermal shock | 50 cycles | — | MIL-I-46058C; −65°C to 125°C |
| Glass transition temperature | 26 | °C | DSC |
| Flammability | V-0 | — | UL 94 |
| Dielectric breakdown voltage | 7500 | volts | ASTM D149 |
| Dielectric constant | 3.6 | — | ASTM D150-98; 1 MHz and 25°C |
| Moisture insulation resistance | 1.6 × 1010 (16 GΩ) | ohms | MIL-I-46058C |
