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
