1R32 LTX & Pre-blended Products

HumiSeal® 1R32 LTX conformal coating is:

  • Fast-drying, single component acrylic conformal coating
  • Specifically designed to protect against the effects of moisture, corrosive environments, and dirt
  • Formulated with reduced xylene and toluene concentration to be fully compliant with GB30981-2020

HumiSeal 1R32 LTX conformal coating has:

  • Protection against moisture, corrosive environments and dirt.
  • Easy application with automated systems.
  • Easy to cure and dry.
  • Low odor in use.
  • Low moisture vapor permeability.
  • Fluoresces under UV for ease of inspection and is easily repaired.
  • Easy removal using Humiseal® Strippers.
  • Range of preblends thinners available for different application methods
  • Compliant with GB30981-2020

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

Application of 1B32 LTX Conformal Coating

Conformal coatings can be successfully applied to substrates that have been cleaned prior to coating and also to substrates assembled with low residue “no clean” materials. Users should perform adequate testing to confirm compatibility between the conformal coating and their particular assembly materials, process conditions and cleanliness level. Please contact HumiSeal® for additional information. 

HumiSeal® 1R32 LTX Pre-Blends are specifically diluted to a viscosity for immediate use. No additional dilution is required. Customers should establish which Pre-Blend is suitable for their equipment and application method before commercial use. HumiSeal® Technical Support should be contacted if any further advice on Pre-Blends and equipment is required.


HumiSeal® 1R32 LTX and Pre-Blends should be stored away from excessive heat or cold, in tightly closed containers.  HumiSeal® products may be stored at temperatures of 0 to 35°C.  Prior to use, allow the product to equilibrate for 24 hours at a room temperature of 18 to 32°C.


Application of HumiSeal® Conformal Coatings should be carried out in accordance with local and National Health and Safety regulations.

The solvents in HumiSeal® Conformal Coatings are flammable. Material should not be used in presence of open flame or sparks. Use only in well-ventilated areas to avoid inhalation of vapours or spray.  Avoid contact with skin and eyes.

Humiseal 1R32 LTX is available in a range of pre-blends, which are formulated for use with no further dilution:

  • Pre-blends with Thinner 600 are ideal for enhanced spray application
  • Pre-blends with Thinner 789 are ideal for film coater systems. Heated systems may be needed for 120CPS pre-blends, providing improved coating coverage

Properties of HumiSeal® 1R32 LTX Pre-blended Products

Product Viscosity








1R32 LTX 200 ± 15 35 ± 3 0.91 ± 0.02 592
1B32 LTX/600 PB120 120 ± 5 29.5 ± 1.5 0.92 ± 0.02 649
1B32 LTX/789 PB120 120 ± 5 31.5 ± 1.5 0.89 ± 0.02 610
1B32 LTX/600 PB65 65 ± 5 23.5 ± 1.5 0.90 ± 0.02 689
1B32 LTX/789 PB65 65 ± 5 26.5 ± 1.5 0.87 ± 0.02 639


Product Specification

Recommended Coating Thickness 25 – 75 microns
Drying Time to Handle per Fed-Std-141, Meth. 4061 10 minutes
Recommended Curing Conditions 24 hrs @ RT or 30 min @ 76°C
Time Required to Reach Optimum Properties 7 days
Recommended Stripper HumiSeal® Stripper 1080
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

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 2.5
Dissipation Factor, at 1MHz and 25°C, per ASTM D150-98 0.01
Insulation Resistance, per MIL-I-46058C 8.0 x 1014 ohms (800TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 6.0 x 1010 ohms (60GΩ)
Fungus Resistance, per ASTM G21 Passes