Applications

LOCTITE STYCAST PC 18M – Urethane Conformal Coating – Solvent resistant protective coating for printed circuit boards

  • Item Name: LOCTITE STYCAST PC 18M
  • Manufacturer: Henkel Corporation
  • Product category: Conformal coating for printed circuit boards
  • Technologies: One-component, solvent-based urethane system
  • Applications: Ideal for coating printed circuit boards to provide environmental and moisture protection while retaining a light, non-discolored appearance
  • Color: Clear amber
  • Cure type: Room temperature cure and heat cure
  • Package size: Contact Techniq VN for details
  • Shelf life: Approximately 18 months (548 days)

1. Product Overview

LOCTITE STYCAST PC 18M is a solvent-based, one-component urethane conformal coating. It provides excellent environmental and moisture protection while maintaining resistance to discoloration. The coating is reworkable, solvent-resistant, and cures at room temperature or with heat.

2. Applications

  • Designed for conformal coating applications
  • Ideal for printed circuit board (PCB) protection
  • Provides superior toughness, abrasion resistance, and resistance to cracking under vibration

3. Typical Properties

Before Mixing (Uncured Material)
Property Value
Free TDI Content (%) <1
NCO Content (%) 4.0
Viscosity @ 25°C (mPa·s) 350
Solids Content (%) 50
Specific Gravity @ 25°C 1.01
Shelf Life (Days @ 25°C) 548
Flash Point (°C) 32
Curing Performance
Cure Condition Time
Air Dry (Room Temp, 30–50% RH) Tack-free: 1-4 hours
Semi-hard film: 1 day
Optimum properties: 7 days
Heat Cure (Oven) 2 hours @ 60°C
After Mixing (Cured Material)
Property Value
Operating Temperature (Continuous) Up to 110°C
Volume Resistivity (Ω·cm) 2×10¹³
Dielectric Strength (V/mil) 1,200
Dielectric Constant @ 100KHz 4.2
Dissipation Factor @ 100KHz 0.01
Insulation Resistance (Ω) 1×10¹⁵ (Cycle 1: 25°C/50% RH)
2×10¹⁰ (Cycle 10: 65°C/95% RH)
Fungus Resistance (ASTM G21) Non-nutrient
Appearance After Thermal/Moisture Testing No blistering, wrinkling, cracking, peeling, or discoloration

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