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LOCTITE STYCAST US 5538 – Urethane Potting Compound – Flexible encapsulation for load coils, transformers, and electronics

  • Item Name: LOCTITE STYCAST US 5538
  • Manufacturer: Henkel Corporation
  • Product category: Urethane potting and encapsulating compound
  • Technologies: Flexible, unfilled polyurethane system with low viscosity and low odor
  • Applications: Ideal for potting and encapsulating load coils, transformers, and similar electronic assemblies; sand can be added to improve thermal conductivity and reduce shrinkage and cost
  • Color: Black
  • Cure type: Room temperature cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: Contact to Techniq VN for details

1. Product Overview

LOCTITE STYCAST US 5538 is a flexible, unfilled, urethane-based potting compound designed for potting and encapsulating applications. It offers low viscosity for good flow, strong adhesion to various substrates, and low odor, making it suitable for workplace environments. The material can encapsulate load coils, transformers, and similar components. Sand can be added to improve thermal conductivity and reduce shrinkage and cost.

2. Applications

  • Potting and encapsulation of load coils, transformers, and electronic components
  • Suitable for applications requiring flexibility and good adhesion
  • Can be extended with sand to enhance thermal conductivity and reduce shrinkage

3. Typical Properties

Property Part A Part B Mixed
Specific Gravity (g/cm³) 1.24 0.96 1.06
Viscosity @ 25°C (cps) 55 850 450
Mix Ratio (by weight) 30 70
Working Time (25°C, min) 20-40
Gel Time (25°C, min) 45-75

4. Curing Conditions

  • Recommended Cure: 24-48 hours @ 25°C
  • Alternate Cure: 1-3 hours @ 60-85°C

5. Typical Properties After Cure

Property Value
Shore Hardness (Durometer A) 65
Moisture Absorption (24 hrs @ 25°C, %) 0.2
Weight Loss (168 hrs @ 125°C, %) 0.005
Glass Transition Temperature (°C) -12
Thermal Conductivity (W/m-K) 0.18

6. Electrical Properties

Property Value
Dielectric Strength (volts/mil) 955
Dielectric Constant / Dissipation Factor (100 Hz @ 25°C) 3.2 / 0.05
Volume Resistivity (ohms-cm) 1.6×10¹⁵
Surface Resistivity (ohms @ 25°C) 3.1×10¹³

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