Product Description
HumiSeal® 1A33 LTX is a high-performance, single-component polyurethane conformal coating, specially formulated for printed circuit board (PCB) applications. Designed with reduced xylene and toluene concentrations, it is fully compliant with the GB30981-2020 standard for VOCs and solvent usage. With its superior protection, ease of application, and environmental compliance, HumiSeal® 1A33 LTX is the ideal solution for ensuring the longevity and reliability of PCBs in challenging environments.
Features of HumiSeal® 1A33 LTX
- 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 preblends thinners available for different application methods
- Compliant with GB30981-2020
- MIL-I-46058C qualified
- IPC-CC-830
- RoHS Directive 2011/65/EU compliant
- Recognized under UL File Number E105698.
Applications of HumiSeal® 1A33 LTX
- Suitable for general printed circuit board applications
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) |
| 1A33 LTX | 180 ± 20 | 44 ± 2 | 0.95 ± 0.02 | 532 |
| 1A33 LTX/521 PB65 | 65 ± 5 | 40 ± 2 | 0.93 ± 0.02 | 559 |
| Property | Value |
| Recommended Coating Thickness | 25 – 75 microns |
| Drying Time to Handle (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, 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 |
| Dielectric Withstand Voltage (MIL-I-46058C) | >1500 volts |
| Dielectric Breakdown Voltage (ASTM D149) | 7500 volts |
| Dielectric Constant (1MHz, 25°C, ASTM D150-98) | 3.6 |
| Dissipation Factor (1MHz, 25°C, ASTM D150-98) | 0.03 |
| Insulation Resistance (MIL-I-46058C) | 2.0 × 10¹⁴ ohms (200TΩ) |
| Moisture Insulation Resistance (MIL-I-46058C) | 1.6 × 10¹⁰ ohms (16GΩ) |
| Fungus Resistance (ASTM G21) | Passes |
