HumiSeal® 1B31EPA is a fast-drying, single-component acrylic conformal coating designed to provide superior moisture and environmental protection for printed circuit assemblies (PCAs). It is available in pre-blended products at various viscosities to suit different application methods. The cured film offers exceptional flexibility, fluoresces under UV light for easy inspection, and can be conveniently repaired.
Key Features of HumiSeal® 1B31EPA
- Fast Drying: Reduces downtime and enhances production efficiency.
- Single Component: Simplifies the application process with no mixing required.
- Flexible Cured Film: Ensures durability and adaptability to stress.
- Fluoresces Under UV Light: Allows for quick and easy quality inspections.
- Easily Repaired: Enables convenient rework when needed.
- Pre-Blended Options: Available in multiple viscosities for a range of applications.
Certifications and Compliance
HumiSeal® 1B31EPA meets strict industry standards, including:
- MIL-I-46058C qualification
- IPC-CC-830 certification
- RoHS Directive 2011/65/EU compliance
- EPA 33/50 Program compliance
Application of HumiSeal® 1B31EPA
To achieve optimal results, ensure that substrates are clean, dry, and free from moisture, dirt, wax, grease, and contaminants. This step is crucial to avoid adhesion or electrical issues caused by ionic or organic residues trapped under the coating. Conformal coatings are commonly applied over “no clean” flux, but it is recommended to perform adequate testing to ensure compatibility with your assembly materials and processes.
Protect your PCAs with HumiSeal® 1B31EPA—a versatile, fast-drying conformal coating solution for moisture and environmental defense. For more information, contact HumiSeal® for expert guidance.
About Prostech
Prostech offers specialty materials (adhesives, tapes, thermal interface materials, insulating materials, sealants, PCB protection materials, …) along with manufacturing solutions. We proudly serve a wide range of industries and are an authorized distributor for leading global manufacturers of industrial materials and equipment. Our product range is designed to deliver customized solutions that address each customer’s unique needs.
With years of experience and a successful project history, we are confident in our ability to provide comprehensive material solutions. These solutions effectively tackle the challenges manufacturers face. To explore our full product catalog, simply click here. Our dedicated team is ready to assist with:
- Provide quotation, sample, TDS/MSDS, and technical consultation
- Testing sample quality and verifying product compatibility in our laboratory
- Customizing material formulas for special applications
- Adapting product sizes, quantities, and packaging to meet specific needs
- Offering expert advice on suitable equipment and automation processes
- Delivering technical training and on-site support for optimal product use
Moreover, Prostech ensures the safe and accurate global delivery of all materials, including “dangerous goods”, in compliance with legal regulations. For personalized technical support or to receive a quotation, please contact us today.
| 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 |
