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LOCTITE STYCAST 2850 MT CAT 27-1

  • Item Name: LOCTITE STYCAST 2850 MT CAT 27-1
  • Manufacturer: Henkel Corporation
  • Product category: Epoxy encapsulant
  • Technologies: Epoxy formulation engineered for high thermal conductivity, low CTE, long pot life, and excellent chemical and physical resistance at elevated temperatures
  • Applications: Ideal for encapsulating components in high voltage applications requiring efficient heat dissipation and thermal shock resistance
  • Color: Blue (resin)
  • Cure type: Heat cure
  • Package size: Contact to Avantek for details
  • Shelf life: 12 months

1. Product Overview

LOCTITE STYCAST 2850 MT CAT 27-1 is a two-component epoxy encapsulant with high thermal conductivity and excellent electrical insulation properties. It is designed for applications requiring heat dissipation, low thermal expansion, and resistance to thermal shock. The product has a long pot life and good chemical resistance, making it suitable for high-voltage applications where surface arching or tracking is a concern.

  • Technology: Epoxy
  • Appearance: Blue
  • Mix Ratio (by weight): 100:5 (Material:Catalyst)
  • Cure Type: Heat cure
  • Operating Temperature: -40°C to +175°C (continuous), up to 200°C (intermittent)
  • Key Benefits:
    • High thermal conductivity
    • Low coefficient of thermal expansion (CTE)
    • Excellent physical and chemical properties at elevated temperatures
    • Long working time

2. Applications

  • Encapsulation of electronic components requiring heat dissipation and thermal shock resistance
  • High-voltage applications to prevent surface arching or tracking
  • Applications involving intricate shapes or tightly packed components
  • Used in industries such as electronics, aerospace, and automotive

3. Typical Properties

Uncured Properties

Property Part A (2850 MT) Part B (CAT 27-1) Mixed
Viscosity @ 25°C (mPa·s) 100,000 300
Density (g/cm³) 2.6 1.05
Working Time (100g, 25°C) 2 hours
Shelf Life (@ 25°C) 12 months

Curing Performance

  • Recommended Cure: 4 hours @ 120°C
  • For best performance, a post-cure of 2 to 4 hours at the highest expected use temperature is suggested.

Cured Properties

Property Value
Hardness (Shore D) 94
Coefficient of Thermal Expansion (CTE) Below Tg: 36 ppm/°C, Above Tg: 107 ppm/°C
Glass Transition Temperature (Tg) TMA: 63°C, DMA: 98°C (Tan Δ Max)
Young’s Modulus (E) @ 35°C: 7,930 N/mm², @ 100°C: 200 N/mm², @ 150°C: 50 N/mm²
Thermal Conductivity 1.6 W/(m-K)
Linear Shrinkage 0.52%
Water Absorption 0.05% (1 day @ RT), 0.16% (1 hr @ 100°C)

Electrical Properties

Property Value
Surface Resistivity 1.7 × 10¹⁶ ohms
Volume Resistivity 4.5 × 10¹⁵ ohm-cm
Dielectric Constant / Dissipation Factor @ 50 Hz: 6.5 / 0.016, @ 1 MHz: 6.1 / 0.018

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