Industrial Electronic PCB Conformal Coating Series

LETBOND® Industrial Electronic PCB Conformal Coating Series

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Description

The LETBOND® Industrial Electronic PCB Conformal Coating series is specifically engineered for the surface protection of printed circuit boards and electronic components. By applying a transparent thin-film coating, it provides essential properties such as moisture resistance, dustproofing, anti-static protection, corrosion resistance, and weatherability. The product line includes traditional Acrylic Solvent-based coatings and advanced UV + Moisture Dual-Curing types to meet the reliability and efficiency demands of the modern electronics industry.

  • 1331 Coating: A traditional acrylic transparent solvent-based coating featuring fast drying times and excellent adhesion. It is optimized for brushing, spraying, or dipping applications.
  • 1334 UV+Moisture Coating: Designed for high-volume production, featuring a dual-curing mechanism to ensure complete cure in shadowed areas and prevent uncured residue.
  • 1335 UV+Moisture Coating: A single-component, low-viscosity coating ideal for precision and high-speed application, offering flame retardancy and superior electrical performance.

Features

  • Excellent Dielectric Properties: High volume resistivity, reliable insulation, and low dielectric loss.
  • Comprehensive Protection: Resistant to moisture, dust, and fungal growth to maintain long-term circuit reliability.
  • Versatile Curing Mechanisms:
    • 1331: Rapid drying via room temperature or heated solvent evaporation.

    • 1334/1335: UV + Moisture dual-curing ensures full solidification even in areas shielded from UV light.

  • Easy Quality Control: Contains fluorescent tracers, allowing for easy coating integrity inspection under UV light.
  • Strong Adhesion & Durability: Bonds exceptionally well to various substrates (PCB, PI, PET, metal connectors) with hardness increasing over time after curing.
  • Safety & Compliance: Fully RoHS compliant; contains no carcinogens or high-risk components like isocyanates.

Applications

  • 1331 Coating:
    • Ideal for general PCB surface protection with an operating temperature range of -55°C to +125°C.
    • Flexible application methods (brushing, spraying, dipping) suitable for standard PCB processing facilities.
  • 1334 UV+Moisture Coating:
    • Optimized for mass-produced electronics, including consumer and automotive electronics.
    • Used for connector reinforcement (PVC/PET/PI to metal) while providing anti-static and moisture-proof benefits.
  • 1335 UV+Moisture Coating:
    • Designed for high-reliability applications requiring flame retardancy (UL94 V-0), such as industrial control boards, power modules, and automotive electronic control systems.
    • Low viscosity profile makes it perfect for automated selective coating equipment.

Selection Specifications

Acrylic Solvent Type
Model Color Viscosity (cps) Hardness
(Shore)		 Curing Time
(min)		 UV Energy
(MJ/CM²)
1331
Pale yellow liquid
100~300
–
Tack-free: 10-15 min
Heat cure: 2~24 hr
Solvent evaporation
Model Color Viscosity (cps) Hardness
(Shore)		 Curing Time
(min)		 UV Energy
(MJ/CM²)
1334
Transparent liquid
100~300
D 70
UV curing; full cure requires moisture
1,000~2,000
1335
Transparent liquid
80~200
A 70
UV curing; full cure requires moisture
1,000~2,000
Notes:
  • The values above are for reference only; actual values are based on the Certificate of Analysis (COA) of the shipped batch.
  • It is recommended to use LB-1331 in conjunction with LETBOND® Thinner LB-528.