HumiSeal® 1A33 LTX is a single component, polyurethane conformal coating, suitable for general printed circuit board applications. It is especially formulated with reduced xylene and toluene concentration to be fully compliant with GB30981-2020*. HumiSeal® 1A33 LTX is also produced as pre-blended products, at a range of viscosities, suitable for a variety of applications with no further dilution required. HumiSeal® 1A33 LTX, and its Pre-blend Products, contain no free isocyanates and fluoresce under UV light for inspection purposes. HumiSeal® 1A33 LTX coating is MIL-I-46058C qualified, IPC-CC-830 and RoHS Directive 2011/65/EU compliant and recognized under UL File Number E105698. *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 1A33 LTX has the following advantages:
• Protection against moisture, salt / corrosive environments and dirt
• Easy application with automated systems • Low moisture vapor permeability.
• Fluoresces under UV for ease of inspection and is easily repaired.
• Range of pre-blends thinners available for different application methods • Compliant with GB30981-2020
Product Specification
Recommended Coating Thickness
25 – 75 microns
Drying Time to Handle per Fed-Std-141, Meth. 4061
15 minutes
Optional Curing Conditions to Reach Optimum Properties
30 days @ RT
30 hours @ 76°C
20 hours @ 88°C
Recommended Stripper
HumiSeal® Stripper 1063
Thermal Shock, 50 cycles per MIL-I-46058C
-65°C to 125°C
Coefficient of Thermal Expansion – TMA
193 ppm/°C
Glass Transition Temperature – DSC
26°C
Modulus – DMA
27.2 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
