3M Scotchcast 281 Resin | 3M Scotchcast Electrical Liquid Resins

3M Scotchcast Electrical Liquid Resins

3M Scotchcast 281 Resin

3M Scotchcast Resin 281 is a filled electrical liquid, epoxy resin for temperature curing with the following features common to the complete range of 3M Scotchcast Electrical Liquid Resins:

• Easy Mixing Ratios
• Moderate to Long Pot Life
• Low Exotherm
• High Adhesion
• Good to Excellent Electrical Properties
• Range of Flexibility and Viscosity

281 Resin is a filled version of 3M resin 280 offers many of the key features of 3M resin 280 plus lower shrinkage, improved thermal and mechanical shock resistance, plus high thermal conductivity. Contact us for 3M Electrical technical support, specification guidance or assistance on the selection of electrical insulating resins for all LV MV HV applications.

3M Scotchcast Electrical Liquid Resins

Typical Property Data – Oven Cures – Filled Resins

Polymer Cure/ Cured Form/ Filler/Colour – Epoxy, Oven-Temperature, Semiflexible, Filled Cream
Temperature Class – F
3M Electrical Liquid Resin Product Number – 281
Mixing Ratio A/B – Wt 2:3 Vol (%) 37:63
Viscosity at 23°C (73°F) (Centipoise) – A = 320,000 B = 38,000 Mixed = 75,000
Cure Schedules (Temp/Time) – 120°C (248°F) 2- hrs.
Gel Time – 21 min

3M Scotchcast 281 Resin

3M Scotchcast Resin Temperature Classes

A resin rated in a specific temperature class is deemed capable of operating continuously at that temperature. The Association of Industrial Electrical Engineers (AIEE Standard Number 1) denotes some of these temperature class ratings:
Class O = 90°C (194°F)
Class A = 105°C (221°F)
Class B = 130°C (266°F)
Class F = 155°C (311°F)
Class H = 180°C (356°F)

Typical Applications: Motor or transformer iron, transformer coil, toroidal core, busbar, wound assembly (coil impregnation)

3M Scotchcast Electrical Liquid Resins are 100-percent-solid, thermosetting, electrical-grade insulating resins. Classified chemically as either epoxies or polyurethanes, the 3M Scotchcast product line includes two-part epoxy liquids and two-part polyurethane liquids. The unique electrical and physical properties make them ideal for insulating and protecting electrical and electronic parts and assemblies, including cable joints, splices, connections and cables. Their physical features also make them suitable for nonelectrical, general-use applications, such as adhesives and sealants. 3M Scotchcast Powder Resins are a series of one-part, 100-percent-solid electrical-grade systems offering fast curing, excellent thermal and mechanical shock resistance, significant cut-through resistance, high adhesion, excellent chemical and moisture resistance, high-to-low flow characteristics and excellent electrostatic coating capability.