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- HumiSeal 1A33 SEC Urethane Conformal Coating
HumiSeal 1A33 SEC Urethane Conformal Coating
- Single-component polyurethane conformal coating
- Fluoresces under UV light for inspection
- No free isocyanates
Product Description
HumiSeal 1A33 SEC is an isocyanate-free polyurethane coating designed for the rugged protection of PCBs. It delivers superior resistance to moisture and fungus, making it ideal for electronics deployed in harsh or tropical environments. With a focus on ease of use, it is optimized for spray application, features UV traceability for QC, and meets the rigorous IPC-CC-830 industry standard.
Product Key Features
- Single-component polyurethane conformal coating
- No free isocyanates
- Engineered for excellent coverage on sharp-edge components
- Optimized for atomized spray application with no thinning required
- Fluoresces under UV light for inspection
- Extremely low moisture vapor permeability
- Excellent chemical resistance
- Compliant with GB30981-2020 (VOC/solvent limits)
- Provides protection against moisture, salt/corrosive environments, and dirt
- Fast handling dry time (< 20 minutes)
Applications
- Precision or high-density PCB assemblies requiring improved edge coverage
- Electronics coated primarily via atomized spray systems
- Industrial and consumer electronics exposed to harsh environments
- Automotive ECUs and modules requiring durable polyurethane protection
- Boards requiring UV fluorescence for ease of inspection
- No-clean assemblies where compatibility with low-residue flux is needed
Technical Specifications
| General Properties | |
| Density (g) | 0.87 g/cm3 |
| Film Thickness Film Thickness Film thickness is the thickness of a backing film without taking into account any coatings or adhesive layers. It is measured in micron and the conversion factor to mil is 0.039. | 25 -100 µm |
| Solids | 35 % |
| Physical Properties | |
| Viscosity Viscosity Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application | 50 - 2000 mPa.s |
Additional Information
Learn More About HumiSeal® 1A33 SEC
Application Methods
HumiSeal® 1A33 SEC is engineered primarily for atomized spray application. Its shear-responsive viscosity provides excellent edge coverage without requiring dilution.
Spraying (Recommended): Designed to reach application viscosity under shear, enabling smooth atomized spray coating. No additional thinner is required for standard operation.
Dipping: Possible but not the primary method. Coating behavior may vary depending on component density—ensure controlled withdrawal to avoid excess buildup.
Brushing: Suitable for local touch-up or repair. As with all polyurethane coatings, uniformity depends on operator technique.
Important Notes:
- Surfaces must be free of moisture, grease, flux residues, and contaminants
- No thinning is required for spray application due to built-in shear thinning characteristics
- Allow product to equilibrate for 24 hours at ambient conditions before use
- Perform validation prior to full production use
Application Compatibility
HumiSeal® 1A33 SEC is compatible with common PCB substrates and electronic assemblies used in automotive, industrial, and consumer electronics.
Compatible With:
✔ FR‑4 PCB substrates
✔ Copper, tin, nickel, and plated component finishes
✔ No‑clean assemblies and low-residue processes
✔ Automated spray systems (ideal), manual touch-up tools
Not Recommended For:
✖ Contaminated or wet substrates
✖ Use near open flames, sparks, or ignition sources during application
Additional Guidance:
UV fluorescence allows easy inspection and verification of complete and uniform coating coverage, especially on sharp-edge components.
Safety and Handling Precautions ⚠️
- Use only in well-ventilated areas
- Avoid inhalation of vapors or atomized spray mist
- Avoid contact with skin and eyes
- Keep away from sparks, heat, and open flames
- Follow all applicable safety regulations
Always consult the Safety Data Sheet (SDS) before use.
Storage Recommendations 📦
Store HumiSeal® 1A33 SEC in tightly closed containers away from excessive heat or cold. Recommended storage temperature is 0–35°C. Allow the product to equilibrate for 24 hours at 18–32°C before application.
Shelf Life: 6 months from date of manufacture.
Safety and Handling Precautions ⚠️
- Use only in well-ventilated areas
- Avoid inhalation of vapors or spray mist
- Avoid contact with skin and eyes
- Keep away from sparks, heat, and open flames
- Follow local and national safety regulations
Always consult the Safety Data Sheet (SDS) before use.
Storage Recommendations 📦
Store HumiSeal® 1A33 in tightly closed containers, away from excessive heat or cold. Recommended storage temperature is 0–35°C. Equilibrate product for 24 hours at 18–32°C before use.
Compliance You Can Trust ✅
HumiSeal® 1A33 meets critical regulatory and industry standards:
✔ MIL-I-46058C, IPC-CC-830B, IEC60664-3, UL746E, UL94 V-0
✔ RoHS and REACH compliant
✔ UV-fluorescent for inspection and quality control
✔ No free isocyanates
