Product Introduction
HumiSeal® 1B31EPA is a fast-drying, single-component acrylic conformal coating designed to provide superior moisture and environmental protection for printed circuit assemblies. It is available in pre-blended products of various viscosities to suit different application methods.
HumiSeal® 1B31EPA Features
- Fast-drying, reducing downtime.
- Single component, no mixing required.
- Flexible cured film for durability.
- Fluoresces under UV light for easy inspection.
- Easily repaired.
- MIL-I-46058C qualified.
- Complies with IPC-CC-830 and RoHS directives.
HumiSeal® 1B31EPA Applications
- Perfect for protecting printed circuit assemblies (PCAs) in environments exposed to moisture and contaminants.
About Prostech
Prostech Philippines is a one-stop solution provider for specialty materials and equipment across electronics manufacturing, from PCBA to final assembly. Our core material and equipment solutions include:
- PCB Assembly Materials
- Cleaning & Degreaser
- Circuit Board Protection
- Thermal Management Solutions
- EMI Shielding
- General Assembly Adhesives
- Elastomeric Materials
- Process Equipment: Potting & Coating Systems, UV/ Heat Curing, Plasma Treatment, Tape placement automation, and cleaning machines
Technical Added Value to customer
Prostech offers customized material and process equipment solutions with engineering support throughout R&D, production process optimization, and performance validation. Our in-house lab located in Alabang, Muntinlupa is equipped to conduct electronics material testing, application simulation, and adhesive validation, helping customers reduce the need for onsite trials and accelerate implementation.
International Supply Chain Advantage
Regional warehouse hubs across Vietnam, Singapore, Malaysia, and the Philippines ensure cross-border reliable supply. In Philippines PEZA-bonded warehouse located at Lima Industrial Park, Batangas enables Prostech to provide responsive, demand-based delivery and significantly shortens standard lead time for Philippines customers.
Need help selecting the right product or solution?
| Product | Viscosity, CPS | Solids Content, % | Density, g/cm³ | VOC, g/L |
| 1B31EPA | 265.0 – 385.0 | 25.00 – 31.00 | 0.95 ± 0.03 | 684 |
| 1B31EPA/600 PB65 | 60.0 – 70.0 | 18.00 – 20.00 | 0.94 ± 0.01 | 761 |
| 1B31EPA/604 PB35 | 30.0 – 40.0 | 14.00 – 16.00 | 0.93 ± 0.01 | 786 |
| Density, per ASTM, Meth. D1475 | 0.95 ± 0.03 g/cm³ |
| Solids Content, % by weight per Fed-Std-141, Meth. 4044 | 28 ± 3 % |
| Viscosity, per Fed-Std-141, Meth. 4287 | 325 ± 60 centipoise |
| VOC | 684 grams/litre |
| Drying Time to Handle per Fed-Std-141, Meth. 4061 | 30 minutes |
| Recommended Coating Thickness | 25 – 75 microns |
| Recommended Curing Conditions | 24 hrs @ RT or 30 min @ 76°C |
| Time Required to Reach Optimum Properties | 7 days |
| Recommended Thinner (dipping, brushing) | HumiSeal Thinner 604 |
| Recommended Thinner (spraying) | HumiSeal Thinner 600 |
| Recommended Stripper | HumiSeal Stripper 1080 |
| Shelf Life at Room Temperature, DOM | 24 months |
| Thermal Shock, 50 cycles per MIL-I-46058C | -65°C to 125°C |
| Coefficient of Thermal Expansion – TMA | 170 ppm/°C below Tg |
| 340 ppm/°C above Tg | |
| Glass Transition Temperature – DSC | 14°C |
| Modulus – DMA | 2000 MPa@ -40°C |
| 1050 MPa@ 20°C | |
| 8.5 MPa@ 60°C | |
| Flammability, per MIL-I-46058C | Self-Extinguishing |
| Dielectric Withstand Voltage, per MIL-I-46058C | >1500 volts |
| Dielectric Breakdown Voltage, per ASTM D149 | 6300 volts |
| Dielectric Constant, at 1MHz and 25°C, per ASTM D150-98 | 2.6 |
| Dissipation Factor, at 1MHz and 25°C, per ASTM D150-98 | 0.01 |
| Insulation Resistance, per MIL-I-46058C | 5.5 x 1012 ohms (550TΩ) |
| Moisture Insulation Resistance, per MIL-I-46058C | 7.0 x 1010 ohms (70GΩ) |
| Fungus Resistance, per ASTM G21 | Passes |
