Humiseal 1B51NSLU D40 | Synthetic Rubber Conformal Coating
Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium
Main features
- 10-Minute Handling-Dry Coating
- Below 1 g/m^2 day mil MVTR
- Flexible UV-Fluorescent Reworkable Coating
Product Description
HumiSeal® 1B51NSLU Synthetic Rubber Conformal Coating is a fast-drying, single-component coating for printed circuit board protection. The methylcyclohexane-based formulation combines a flexible synthetic rubber polymer with very low documented moisture-vapor transmission and UV fluorescence for inspection. It can be applied by dipping, spraying, or brushing and is recommended at 25–75 µm dry coating thickness. Typical handling dry time is 10 minutes, with recommended cure conditions of 24 hours at room temperature or 30 minutes at 76°C. The coating is also reworkable using the recommended HumiSeal stripper.
Key features
- Single-component synthetic rubber coating for printed circuit board protection.
- Fast handling dry: 10 minutes by Fed-Std-141, Method 4061.
- Recommended coating thickness: 25–75 µm.
- UV fluorescent to support coating inspection.
- Very low moisture-vapor transmission: less than 1 g/m²·day·mil by ASTM E398-03.
- Reworkable with HumiSeal® Stripper 1080 or 1080EU.
Applications / Suitable for
- Protective conformal coating of printed circuit boards.
- Assemblies requiring dip, spray, or brush application.
- Coated assemblies requiring UV-assisted inspection and practical rework.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Other Properties
Thermal Properties
Electrical Properties
Additional Information
HumiSeal® 1B51NSLU Synthetic Rubber Conformal Coating
A fast-drying, single-component protective coating for printed circuit boards. The methylcyclohexane-based formulation combines flexibility, UV fluorescence for inspection, very low documented moisture-vapor transmission, and practical reworkability.
As-supplied properties
Typical product-selection data; values are not specification limits.
| Property | Value | Method / context |
|---|---|---|
| Product form | Single-component liquid | Synthetic rubber conformal coating |
| Density | 0.81 ± 0.02 g/cm³ | ASTM D1475 |
| Solids content | 22 ± 2 wt% | Fed-Std-141, Method 4044 |
| Viscosity | 185 ± 30 cP | Fed-Std-141, Method 4287 |
| VOC | 632 g/L | As reported |
| Handling dry time | 10 minutes | Fed-Std-141, Method 4061 |
Application and cure
Surfaces should be free of moisture, dirt, wax, grease, flux residues, and other contaminants. Assemblies using “no-clean” materials require compatibility and reliability testing before coating.
Store in tightly closed containers away from excessive heat or cold at 0–35°C. Before use, allow the product to equilibrate for 24 hours at 18–32°C. Shelf life is 18 months from the date of manufacture when stored at room temperature. The solvent system is highly flammable; use only with suitable ventilation and away from ignition sources, following the current SDS and local regulations.
Final coating properties
Typical values apply to the stated methods and conditions and are not guaranteed specifications.
| Property | Result | Method / condition |
|---|---|---|
| Thermal shock | 50 cycles, -65°C to 125°C | MIL-I-46058C |
| Coefficient of thermal expansion | 55 ppm/°C | TMA |
| Glass transition temperature | 14°C | DSC |
| Modulus | 93.1 MPa at -20°C; 73.5 MPa at 0°C; 35.3 MPa at 20°C | DMA |
| Moisture-vapor transmission | <1 g/m²·day·mil | ASTM E398-03 |
| Dielectric withstand voltage | >1500 V | MIL-I-46058C |
| Dielectric breakdown voltage | 4900 V | ASTM D149 |
| Dielectric constant | 2.5 | ASTM D150-98, 1 MHz and 25°C |
| Dissipation factor | 0.07 | ASTM D150-98, 1 MHz and 25°C |
| Insulation resistance | 2.0 × 10¹⁴ Ω | MIL-I-46058C |
| Moisture insulation resistance | 1.0 × 10¹⁰ Ω | MIL-I-46058C |
| Fungus resistance | Passes | ASTM G21 |
Applications
HumiSeal® 1B51NSLU is intended as a protective conformal coating for printed circuit boards. Final suitability depends on substrate cleanliness, assembly materials, coating process, thickness, cure, and end-use conditions.
Evaluate HumiSeal® 1B51NSLU for your PCB coating process
Contact Krayden to discuss substrate preparation, no-clean material compatibility, dip or spray viscosity control, coating thickness, cure conditions, inspection, rework, and qualification testing for your printed circuit board assembly.
