HumiSeal 1A33 SEC Urethane Conformal Coating
Harmonization Code : 3906909090 | Acrylic polymers in primary form Others>Others
Main features
- 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
HUMISEAL 1A33SEC
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TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
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.
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Spraying (Recommended): Designed to reach application viscosity under shear, enabling smooth atomized spray coating. No additional thinner is required for standard operation.
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Dipping: Possible but not the primary method. Coating behavior may vary depending on component density—ensure controlled withdrawal to avoid excess buildup.
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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
