3M 280

Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide

3M 280

Main features

  • Low-Viscosity Fine-Wire Impregnation
  • Semiflexible Cured Performance
  • Class F Electrical Insulation

Product Description

3M Scotchcast Electrical Resin 280 is an unfilled, two-part epoxy liquid resin for oven-cured impregnation, potting, and encapsulation of electrical components. A 2:3 weight ratio or 37:63 volume ratio produces a typical mixed viscosity of 4,000 cP at 23 deg C for wetting and fine-wire penetration. After cure, the semiflexible Class F material has typical 85% elongation, 65 Shore D hardness, and electric strength of 14.8 kV/mm (375 V/mil) on a 3.175 mm (1/8 in) specimen. Its application range includes coils, transformers, strain-sensitive circuitry, modules, and other electrical or electronic assemblies requiring moisture and thermal-shock resistance.

Key features

  • Low-viscosity impregnation: Typical mixed viscosity is 4,000 cP at 23 deg C for wetting fine-wire coil structures.
  • Semiflexible cured response: Typical cured elongation is 85% with 65 Shore D hardness.
  • Class F electrical performance: The resin is rated to 155 deg C and has typical electric strength of 375 V/mil under the stated sample condition.

Applications

Applications include impregnation, potting, and encapsulation of coils, transformers, strain-sensitive circuitry, modules, and electrical or electronic components.

Product Family

3M 280

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Color
The color
Clear Amber
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Two Part (A / B)
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.08
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
85 %
Other Properties
Storage Temperature
20 - 30 °C

Additional Information

Technical properties

As-supplied / before-processing properties

Handling values are typical; component values and mix-ratio bases remain separated.

PropertyValueUnitMethod / condition
Mix ratio by weight (A:B)2:3-Before processing
Mix ratio by volume (A:B)37:63%Before processing
Part A initial viscosity12,500cPTypical at 23 deg C
Part B initial viscosity2,500cPTypical at 23 deg C
Mixed initial viscosity4,000cPTypical at 23 deg C
Density (A / B)1.15 / 1.01kg/LTypical
Gel time20minTypical at 121 deg C
Cure guide2 to 3 h / 6 to 8 h / 24 h-120 deg C / 95 deg C / 75 deg C
Technical properties

Final-state / after-processing properties

Cured properties are typical and not recommended for specification purposes.

PropertyValueUnitMethod / condition
Cured colorClear amber-Typical
Specific gravity1.08-Typical; cured
Hardness65Shore DTypical
Compressive strength2,400psiTypical; 10% compression
Tensile strength1,950psiTypical
Elongation at break85%Typical
Electric strength375 (14.8)V/mil (kV/mm)Typical; 1/8 in (3.175 mm) sample
Moisture absorption0.5% weight gainTypical; 240 h at 96% RH
Volume resistivity1 x 10^15ohm-cmTypical at 23 deg C

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