Loctite STYCAST 2651-40W1

Harmonization Code : 3907.30.00.15 | Epoxide resin, halogen-free

Loctite STYCAST 2651-40W1

Main features

  • Epoxy Potting and Encapsulation Resin
  • Room-Temperature Encapsulation Cure
  • 0.5 W/(m K) Thermal Encapsulation

Product Description

LOCTITE® STYCAST 2651-40 W1 GOLD is a gold-colored epoxy resin for general potting and encapsulation of metal, plastic, and ceramic assemblies. The material has a typical viscosity of 33,000 mPa·s at 25°C and may be combined with LOCTITE CAT 9 for room-temperature cure or LOCTITE CAT 11 for elevated-temperature cure. The selected catalyst changes mix ratio, pot life, coefficient of thermal expansion, moisture absorption, electrical properties, and operating-temperature range. After cure, the material is documented as machinable with carbide tools.

Key features

  • General potting resin: The epoxy is documented for potting and encapsulation of metals, plastics, and ceramics.
  • Two catalyst options: CAT 9 supports room-temperature cure, while CAT 11 supports elevated-temperature cure.
  • Machinable cured material: The fully cured epoxy may be machined with carbide tools.

Applications / Suitable for

  • General electrical and electronic potting
  • Encapsulation of metal, plastic, and ceramic assemblies
  • Castings requiring post-cure machining
Product Family

STYCAST 2651-40W1

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TDS, SDS & Technical Documents

Technical Specifications

Physical Properties
Viscosity
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
32,500 mPa.s
General Properties
Density (g)
1.5 g/cm3
Thermal Properties
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.
0.55 W/m.K
Electrical Properties
Dielectric Strength
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material. Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property. As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
450 kV/mm

Additional Information

Technical properties

As-supplied / before-processing properties

Typical as-supplied or mixed-state values unless otherwise stated. These values are not sales specifications.

Property Value Unit Method / condition
Appearance Gold N/A Resin as supplied
Viscosity 33,000 mPa·s At 25°C
Density 1.5 g/cm³ Resin as supplied
Shelf life 365 days At 18°C to 25°C from date of manufacture
Mix ratio with CAT 9 100:8 to 9 parts by weight Resin : catalyst
Pot life with CAT 9 30 min Typical
Mix ratio with CAT 11 100:10 to 11 parts by weight Resin : catalyst
Pot life with CAT 11 4 h Typical
Technical properties

After-processing / final-state properties

Typical final-state values under the stated system and test conditions. These values are not sales specifications.

Property Value Unit Method / condition
Hardness 87.5 Shore D With CAT 9
Thermal conductivity 0.5 W/m·K With CAT 9
CTE 78 ppm/°C With CAT 9
Operating temperature -40 to 175 °C With CAT 9
Hardness 87.5 Shore D With CAT 11
Thermal conductivity 0.5 W/m·K With CAT 11
CTE 45 ppm/°C With CAT 11
Operating temperature -70 to 175 °C With CAT 11

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