STYCAST 1266

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

STYCAST 1266

Main features

  • Low-Viscosity Fine-Gap Impregnation
  • Optically Clear Encapsulation
  • Flexible Ambient or Heat Cure

Product Description

LOCTITE STYCAST 1266 Epoxy Encapsulant is a clear, two-component low-viscosity epoxy system for impregnation and encapsulation where optical clarity and flow into small tolerances are important. Parts A and B mix 100:28 by weight or 100:33 by volume to produce a typical mixed viscosity of 650 cP and a 30-minute working time at 25 deg C. The material can cure at ambient temperature or in one to two hours at 65 deg C, with an optional post-cure. After cure, it provides documented mechanical strength, moisture resistance, and electrical insulation.

Key features

  • Fine-gap impregnation: A typical mixed viscosity of 650 cP supports flow into narrow spaces.
  • Optically clear encapsulation: The clear system supports applications requiring visible components.
  • Flexible cure options: Ambient and heat-cure schedules support different production needs.

Applications

Applications include impregnation and encapsulation of electrical or electronic components, including assemblies with small tolerances and a need for optical clarity.

Product Family

STYCAST 1266

Loading pricing…
TDS, SDS & Technical Documents

Technical Specifications

General Properties
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Two Part (Resin | Hardener)
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.
15.7 kV/mm
Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
1×10¹⁵ Ohms⋅cm
Other Properties
Storage Temperature
25 °C

Additional Information

Technical properties

As-supplied / before-processing properties

Property Value Unit Method / condition
Product form Two-component clear epoxy system Part A is clear amber; Part B is clear yellow
Mix ratio 100:28 parts by weight Part A:Part B
Mix ratio 100:33 parts by volume Part A:Part B
Part A viscosity 8,500 cP ASTM D2393
Part B viscosity 35 cP Typical
Mixed viscosity 650 cP 25 deg C; typical
Mixed specific gravity 1.12 Typical
Working time 30 minutes 100 g mass at 25 deg C
Technical properties

After-processing / final-state properties

Property Value Unit Method / condition
Hardness 75 Shore D ASTM D2240
Dielectric strength 15.7 kV/mm ASTM D149
Dielectric constant 3.0 60 Hz; ASTM D150
Dissipation factor 0.02 60 Hz; ASTM D150
Volume resistivity 1 x 10^15 ohm cm 25 deg C; ASTM D257
Flexural strength 138 N/mm^2 Typical cured value
Compressive strength 69 N/mm^2 Typical cured value
Tensile strength 41 N/mm^2 Typical cured value

Leading Brands Trust in Our Products and Services

Products that Perform| Knowledge that Serves| Service that Delivers