HumiSeal 1A33LOS Urethane Conformal Coating
Harmonization Code : 3906909090 | Acrylic polymers in primary form Others>Others
Main features
- Fluoresces under UV light for easy inspection
- Low moisture vapor permeability
- No free isocyanates
Product Description
HumiSeal 1A33LOS is a high-performance, single-component polyurethane coating that eliminates the safety risks associated with traditional isocyanates. Ideal for high-reliability PCBs, it provides a tough, chemical-resistant shield while remaining low-odor and low-toxicity. With UV fluorescence for inspection and full RoHS compliance, it offers a "no-compromise" transition from standard 1A33 to a safer, more sustainable production process.
Product Key Features
- Single-component polyurethane conformal coating
- Reduced odor formulation with lower toxicity solvents
- Comparable cured performance to HumiSeal 1A33
- Fluoresces under UV light for easy inspection
- No free isocyanates
- Low moisture vapor permeability
- Available in ready-to-use pre-blended viscosities
- RoHS Directive 2015/863/EU and China RoHS 2 compliant
Applications
- Printed circuit board (PCB) protection
- Consumer electronics assemblies
- Industrial electronics
- Telecommunications equipment
- Automotive electronic modules
- Power supply assemblies
- Electronic assemblies requiring low-odor coatings
HS-1A33LOS
Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.
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TDS, SDS & Technical Documents
- 1A33LOS TDS
Technical Specifications
General Properties
Physical Properties
Thermal Properties
Additional Information
Learn More About HumiSeal® 1A33LOS
Application Methods
HumiSeal® 1A33LOS is available in pre-blended viscosities for immediate use, supporting multiple application techniques.
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Dipping: Apply using a controlled immersion and withdrawal rate of 5–15 cm/min to ensure uniform coating thickness. Monitor viscosity regularly and adjust with approved thinner as needed.
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Spraying: Pre-blended grades can be sprayed using conventional spray equipment. Adequate ventilation is required to remove solvent vapors and mist.
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Brushing: Suitable pre-blends may be applied by brush. Film uniformity depends on viscosity selection and operator technique.
Important Notes:
- Substrate cleanliness is critical for coating performance.
- Perform compatibility testing prior to production use.
- Consult HumiSeal® Technical Support for pre-blend selection.
Application Compatibility
HumiSeal® 1A33LOS is compatible with a wide range of materials used in electronic assemblies.
Compatible With:
✔ FR-4 and common PCB substrates
✔ Metals and plated finishes
✔ Most electronic components
✔ Automated coating equipment
Not Recommended For:
✖ Contaminated or moisture-laden substrates
✖ Application near open flames or ignition sources
Additional Guidance:
Always verify material compatibility and cleanliness prior to coating. UV fluorescence allows easy inspection and repair after application.
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 health and safety regulations
Always consult the Safety Data Sheet (SDS) before use.
Storage Recommendations 📦
Store HumiSeal® 1A33LOS and its pre-blends in tightly closed containers away from excessive heat or cold. Recommended storage temperature is 0–35°C. Allow material to equilibrate for 24 hours at 18–32°C before use.
Compliance You Can Trust ✅
HumiSeal® 1A33LOS meets international reliability and compliance standards:
✔ RoHS Directive 2015/863/EU compliant
✔ China RoHS 2 compliant
✔ No free isocyanates
✔ UV fluorescent for inspection and quality control
