Harmonization Code : 3907.30.00.90 |   Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms : Epoxide resins : Other
Main features
  • Thermally conductive
  • Low CTE
  • Used with various catalysts

Product Description

LOCTITE® STYCAST 2850FT is a black, thermally conductive epoxy encapsulant recommended for encapsulation of components that require heat dissipation and thermal shock properties. This PCB coating is also available in the unpigmented version.

LOCTITE® STYCAST 2850FT  can be used with catalysts LOCTITE CAT 9, LOCTITE CAT 11, LOCTITE CAT 23LV or LOCTITE CAT 24LV which change its characteristics.

The following specifications are for the combination with CAT 9. Please consult the TDS for the cured properties of each catalyst mixture.

Product Family
1 Quart Kit

Catalog Product

Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.

Technical Specifications

General Properties
Collected Volatile Condensable Materials
0.01 %
Total Mass Loss
0.25 %
Physical Properties
Viscosity is a measurement of a fluid’s resistance to flow.

Viscosity is commonly measured in centiPoise (cP). One cP is defined as
the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP.

A product like honey would have a much higher viscosity -around 10,000 cPs-
compared to water. As a result, honey would flow much slower out of a tipped glass than
water would.

The viscosity of a material can be decreased with an increase in temperature in
order to better suit an application
250,000 mPa.s
Chemical Properties
Water Absorption 0.03 %
Mechanical Properties
Hardness is a dimensionless quantity. There is no direct relationship between measurements in one scale and their equivalent in another scale or another hardness test.
Durometer (Shore D) 96
Thermal Properties
Coefficient of Thermal Expansion (CTE)
Coefficient of Thermal Expansion (CTE)
CTE (Coefficient of thermal expansion) is a material property that is indicative of the extent to which a material expands with a change in temperature. This can be a change in length, area or volume, depending on the material.

Knowing the CTE of the layers is helpful in analyzing stresses that might occur when a
system consists of an adhesive plus some other solid component.
Coefficient of Thermal Expansion (CTE), α1
Coefficient of Thermal Expansion (CTE), α1
CTE α1 (alpha 1) is the slope of the Coefficient of thermal expansion in a temperature range below the Glass transition temperature (Tg).

It explains how much a material will expand until it reaches Tg.
35 ppm/°C
Coefficient of Thermal Expansion (CTE), α2
Coefficient of Thermal Expansion (CTE), α2
CTE α2 (alpha 2) is the slope of the Coefficient of thermal expansion in a temperature range above the Glass transition temperature (Tg).

It explains the extent to which a material will expand after it passes Tg.
98 ppm/°C
Glass Transition Temperature (Tg)
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding.

The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
86 °C
Thermal Conductivity
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance.

Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
1.25 W/m.K

Additional Information

Cure Schedule


  • 16 to 24 hours @ 25°C
  • 4 to 6 hours @ 45°C
  • 1 to 2 hours @ 65°C


  • 8 to 16 hours @ 80°C
  • 2 to 4 hours @ 100°C
  • 30 to 60 minutes @ 120°C


  • 16 to 24 hours @ 25°C
  • 4 to 6 hours @ 45°C
  • 2 to 4 hours @ 65°C


  • 8 to 16 hours @ 25°C
  • 4 to 6 hours @ 45°C
  • 2 hours @ 65°C


  • 4 hours @ 120°C