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LOCTITE STYCAST ES 6501 – Epoxy Encapsulant – General purpose potting and encapsulation for electronic applications

  • Item Name: LOCTITE STYCAST ES 6501
  • Manufacturer: Henkel Corporation
  • Product category: Epoxy encapsulant for potting and encapsulation
  • Technologies: Two-component epoxy system with a rigid, low to medium viscosity formulation
  • Applications: Designed for general potting and encapsulation applications
  • Color: Mixed Black (Part A is a black liquid; Part B is a yellow liquid)
  • Cure type: Heat cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: 240 days (in cool, dry conditions)

1. Product Overview

LOCTITE STYCAST ES 6501 is a two-component epoxy encapsulant designed for general potting and encapsulation applications. It offers a rigid cure with low to medium viscosity and requires heat curing.

2. Applications

  • Potting and encapsulation for electronic components
  • Suitable for applications requiring good electrical insulation and mechanical protection

3. Typical Properties

Uncured Properties
Property Value
Appearance – Mixed Black
Appearance – Part A Black liquid
Appearance – Part B Yellow liquid
Mix Ratio (by weight) 100:13 (Part A: Part B)
Mix Ratio (by volume) 4.59:1 (Part A: Part B)
Mixed Viscosity @ 25°C (cP) 3,380 (Spindle 3, 10 rpm)
Density 1.53
Working Time @ 25°C (100cc) 30 to 60 min
Shelf Life (Cool, dry conditions) 240 days
Curing Performance
Cure Condition Time
Room Temp (20-30°C) 12 to 24 hours
Heat Cure (60-85°C) 1 to 3 hours
Cured Properties
Property Value
Hardness (Shore D) 85
Glass Transition Temperature (Tg) 57°C
Coefficient of Linear Thermal Expansion 47 × 10⁻⁶ (Alpha 1: -10 to 30°C)
151 × 10⁻⁶ (Alpha 2: 70 to 110°C)
Thermal Conductivity 0.46 W/(m-K)
Moisture Absorption (24h immersion) 0.13%
Weight Loss (168 hrs @ 105°C) 0.17%
Electrical Properties
Property Value
Volume Resistivity (100 VDC) 22 × 10¹⁷ ohm-cm
Surface Resistivity (100 VDC) 7.7 × 10¹⁵ ohm
Arc Resistance 87 sec
Dielectric Constant / Dissipation Factor @ 1 kHz: 4.17 / 0.009
@ 100 kHz: 4.02 / 0.016
Dielectric Strength (0.02″ thickness) 1,175 V/mil

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