Applications

LOCTITE STYCAST UV 7993 – Urethane Conformal Coating – Rugged moisture and chemical protection for printed circuit boards

  • Item Name: LOCTITE STYCAST UV 7993
  • Manufacturer: Henkel
  • Product category: Conformal Coating
  • Technologies: Urethane
  • Applications: Designed to protect printed circuit boards from moisture and chemicals using UV activation followed by ambient moisture cure in shadowed areas.
  • Color: Translucent yellow
  • Cure type: UV light activation followed by room temperature moisture cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: 1 year

1. Product Overview

LOCTITE STYCAST UV 7993 is a one-component, UV-curable urethane conformal coating that also moisture-cures in shadowed areas. It provides rugged protection against moisture and harsh chemicals.

Key Benefits:

  • UV & moisture cure for comprehensive coverage
  • Solvent-free and one-component formula
  • Excellent moisture and chemical resistance
  • Operating Temperature: -40 to 130°C

2. Applications

  • Conformal coating for PCB protection
  • Compatible with solder masks, no-clean fluxes, metallization, and components

3. Typical Properties

Property Value
Uncured Properties
Brookfield Viscosity (mPa·s) 120
Specific Gravity 1.04
Shelf Life @ 25°C (days) 365
Curing Conditions
UVC Cure (Tack-free Surface)
Exposure Time (seconds) 5 – 10
Light Intensity (mW/cm²) >60
Cure Energy (mJ/cm²) >300
UVA Cure
Wavelength (nm) 365
Exposure Time (seconds) 10 – 20
Light Intensity (mW/cm²) 150 – 300
Cure Energy (mJ/cm²) >1,500
Moisture Cure for Shadowed Areas
Relative Humidity 50% @ 25°C 100 hours
Relative Humidity >70% @ 25°C 50 hours
Cured Properties
Hardness (Shore A) 80
Hardness (Shore D) 60
Modulus (N/mm²) 1,150 (166,650 psi)
Electrical Properties
Volume Resistivity (Ω·cm @ 25°C) 2.2 × 10¹⁶
Dielectric Strength (kV/mm) 50
Dielectric Constant 3.34
Dissipation Factor 0.0131
Performance Properties
Tensile Strength (N/mm²) 35 (5,005 psi)

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