HumiSeal® 1B73 is a single-component, fast-drying acrylic conformal coating designed for use on printed circuit assemblies. It offers excellent protection against moisture and dirt, ensuring the longevity and performance of electronic components. HumiSeal® 1B73 is available in pre-blended products with a range of viscosities, making it suitable for various application methods without the need for further dilution. Once fully cured, HumiSeal® 1B73 and its pre-blended variants exhibit comparable properties.
Key Features of HumiSeal® 1B73:
- Excellent flexibility
- Protection against moisture and dirt
- Fluoresces under UV light for easy inspection
- Easily repairable
- Meets MIL-I-46058C, IPC-CC-830, IEC61086, and IEC60664-3 standards
- Recognized under UL File Number E105698
- Compliant with REACH and RoHS Directive EU 2015/863
- Available in a range of pre-blends and thinners for different application methods
Application of HumiSeal® 1B73 Conformal Coating
HumiSeal® 1B73 can be applied to cleaned substrates or those assembled with low-residue “no clean” materials. Proper testing should be conducted to ensure compatibility with assembly materials and process conditions. Contact HumiSeal technical support for further assistance on pre-blends and application methods.
Choose HumiSeal® 1B73 for reliable protection and flexibility in your printed circuit assemblies.
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 (%) | Density (g/cm³) | VOC (g/L) | Shelf Life (DOM, months) |
| 1B73 | 250 ± 20 | 29.5 ± 2 | 0.92 ± 0.02 | 661 | 24 |
| 1B73 PB 23 CPS | 23 ± 5 | 15 ± 1 | 0.90 ± 0.02 | 765 | 12 |
| 1B73 PB 38 CPS | 38 ± 5 | 19.5 ± 1.5 | 0.91 ± 0.03 | 728 | 12 |
| 1B73 PB 55 CPS | 55 ± 5 | 21 ± 1.5 | 0.91 ± 0.03 | 718.9 | 12 |
| 1B73 PB 65 CPS | 65 ± 5 | 22 ± 2 | 0.91 ± 0.02 | 713.7 | 18 |
| 1B73/73 PB 25 CPS | 25 ± 5 | 15.5 ± 1 | 0.91 ± 0.02 | 769 | 12 |
| 1B73/521 PB 25 CPS | 25 ± 5 | 15 ± 1 | 0.90 ± 0.02 | 760 | 24 |
| 1B73/521 PB 65 CPS | 65 ± 5 | 21 ± 1 | 0.91 ± 0.02 | 719 | 24 |
| 1B73/730EU PB 55 | 55 ± 5 | 18.5 ± 1.5 | 0.94 ± 0.02 | 741.7 | 12 |
| 1B73/730EU PB 80 | 80 ± 5 | 20.5 ± 1.5 | 0.93 ± 0.02 | 739.4 | 12 |
| Product Specification | |
| Density, per ASTM D1475 | 0.92 ± 0.02 g/cm³ |
| Solids Content, % by weight per Fed-Std-141, Meth. 4044 | 29.5 ± 2 % |
| Viscosity, per Fed-Std-141, Meth. 4287 | 250 ± 20 centipoise |
| VOC | 661 grams/liter |
| 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 2 hrs @ 76°C |
| Time Required to Reach Optimum Properties | 7 days |
| Recommended Thinner | HumiSeal® Thinner 73 |
| Recommended Stripper | HumiSeal® Stripper 1080, 1080A |
| 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 | 67 ppm/°C |
| Glass Transition Temperature – DSC | 42°C |
| Modulus – DMA | 11.1 MPa |
| Flammability, per UL 94 | V-0 |
| 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 1014 ohms (550TΩ) |
| Moisture Insulation Resistance, per MIL-I-46058C | 7.0 x 1010 ohms (70GΩ) |
| Fungus Resistance, per ASTM G21 | Passes |
