HumiSeal® 1A27 LTX is a single component, polyurethane conformal coating, suitable for general printed circuit board applications. It is specially formulated with reduced xylene and toluene concentration to be fully compliant with GB30981-2020*. HumiSeal® 1A27 LTX contains no free isocyanates. *Standard GB30981-2020 defines limits on VOCs and solvent usage for Conformal Coatings. Standard GB/T 23990-200 defines the test method for Solvent % analysis.
Humiseal 1A27 LTX has the following advantages:
• Protection against moisture, corrosive environments and dirt
• Easy application with automated systems
• Low moisture vapor permeability.
• Range of preblends thinners available for different application methods
• Compliant with GB30981-2020
Product Specification |
|
| Density, per ASTM D1475 | 0.96 ± 0.02 g/cm3 |
| Solids Content, % by weight per Fed-Std-141, Meth. 4044 | 50 ± 3 % |
| Viscosity, per Fed-Std-141, Meth 4287 | 3000 ± 1000 centipoise |
| VOC | 480 grams/liter |
| Recommended Coating Thickness | 25 – 75 microns |
| Drying Time to Handle per Fed-Std-141, Meth. 4061 | 30 minutes |
| Optional Curing Conditions to Reach Optimum Properties | 30 days @ RT
30 hours @ 76°C 20 hours @ 88°C |
| Recommended Thinner | HumiSeal ® Thinner 789 |
| Recommended Stripper | HumiSeal® Stripper 1063 |
| 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 |
| Glass Transition Temperature – DSC | 28°C |
| Modulus – DMA | 18.1 MPa |
| Flammability, per UL 94 | V-0 |
| Dielectric Withstand Voltage, per MIL-I-46058C | >1500 volts |
| Dielectric Breakdown Voltage, per ASTM D149 | 7500 volts |
| Dielectric Constant, at 1MHz and 25°C per ASTM D150-98 | 3.6 |
| Dissipation Factor, at 1MHz and 25°C, per ASTM D150-98 | 0.02 |
| Insulation Resistance, per MIL-I-46058C | 2.0 x 1014 ohms (200TΩ) |
| Moisture Insulation Resistance, per MIL-I-46058C | 1.2 x 1010 ohms (12GΩ) |
