HUMISEAL HumiSeal 1B51NSLU (1-LTR-CAN)

HumiSeal® 1B51NSLU Synthetic Rubber Conformal Coating

Overview

HumiSeal® 1B51NSLU is a fast-drying, single-component synthetic rubber conformal coating designed to protect electronic assemblies from moisture, contamination, and environmental exposure. Formulated with a more environmentally friendly methylcyclohexane solvent system, it provides extremely low moisture vapour permeability, excellent flexibility, low mechanical stress on components, and easy repairability. The coating fluoresces under UV light, allowing efficient inspection of coverage and defects.

Key Technical Specs

• Product Type: Single-component synthetic rubber conformal coating
• Colour: Transparent (UV fluorescent inspection aid)
• Density: 0.81 ± 0.02 g/cm³
• Solids Content: 22 ± 2% by weight
• Viscosity: 185 ± 30 centipoise
• VOC Content: 632 g/L
• Recommended Film Thickness: 25-75 microns
• Dry-to-Handle Time: Approx. 10 minutes
• Full Cure: 24 hours at room temperature or 30 minutes at 76°C
• Optimum Properties: Achieved after 7 days

Approvals & Specifications

• Fully compliant with RoHS Directive 2002/95/EC
• Thermal shock tested to MIL-I-46058C
• Fungus resistance tested to ASTM G21 (Pass)
• Dielectric performance tested to MIL-I-46058C and ASTM standards

Performance Characteristics

• Extremely low moisture vapour transmission
• Excellent flexibility and low component stress
• High dielectric insulation performance
• Resistant to thermal cycling
• Excellent protection against moisture and contaminants
• Easy inspection under UV light
• Repairable coating system

Typical Applications

• Protection of electronic circuit assemblies
• Aerospace and defence electronics
• PCB and component-level protection
• Equipment exposed to humidity and environmental contamination
• High-reliability electronic assemblies

Application Methods

Dipping

• Reduce viscosity using HumiSeal® Thinner 903, 905, or 521EU when required
• Recommended immersion and withdrawal rate: 5-15 cm/min
• Monitor viscosity during processing and adjust with thinner as required

Spraying

• Suitable for conventional spray equipment
• Requires adequate ventilation during application
• Recommended thinner ratio: 1:1 by volume with HumiSeal® Thinner 903, 905, or 521EU
• Adjust thinner ratio and spray pressure according to equipment and application conditions

Brushing

• Suitable for small areas and repair applications
• May require small additions of HumiSeal® Thinner

Compatibility & Safety Notes

• Substrate must be clean, dry, and free from grease, moisture, flux residues, and contaminants
• Compatibility testing recommended when applied over no-clean assembly materials
• Flammable solvents present - avoid sparks and open flames
• Apply only in well-ventilated areas
• Avoid skin and eye contact
• Refer to SDS/MSDS before use

Storage & Shelf Life

• Shelf Life: 18 months at room temperature
• Store in tightly closed containers away from excessive heat or cold
• Recommended storage temperature: 0-35°C
• Allow product to equilibrate for 24 hours at 18-32°C before use

Why This Product is Chosen for Aerospace / Electronics Applications

• Provides reliable moisture protection for critical electronics
• Flexible coating minimises stress on delicate components
• UV traceability improves inspection efficiency
• Repairable coating reduces maintenance downtime
• RoHS-compliant formulation supports modern electronics requirements

Practical Suggestions for Your Team

• Confirm substrate cleanliness before coating application
• Control viscosity carefully during dipping and spraying operations
• Allow full cure before environmental exposure or testing
• Use UV inspection to verify coating coverage
• Maintain proper ventilation during application due to solvent vapours

Manufacturer / Product Codes

• Product Name: HumiSeal® 1B51NSLU
• Product Type: Synthetic rubber conformal coating
• Recommended Thinners: HumiSeal® 903, 905, 521EU
• Recommended Strippers: HumiSeal® 1080, 1080EU
• Manufacturer: HumiSeal® / Chase Corporation