3M Scotchcast 2131 Resin – Flexible, Flame-Retardant & Submersible Resin

Scotchcast 2131

3M Scotchcast Resin 2131 is a two-part polyurethane resin designed to replace the cable jacket when splicing or repairing flexible and training cables – the Scotchcast Resin has been specifically designed for electrical insulation and mechanical protection of resin cable joints.

3M Scotchcast Resin 2131’s formulation makes it particularly suited to withstand the rugged conditions under which mine and portable cables must operate.

Flame retardant resin type Scotchcast 2131 is also used as the insulating material for cable splices or joints operating at up to 1000 volts and designed for 194ºF (90ºC) continuous use/266ºF (130ºC) overload.

Seawater Resistant

A Test Summary according to ISO175 by 3M Electrical Market Laboratory concluded resistance to 10% salt water solution – a test specimen of Scotchcast 2131 resin after 16 weeks in salt water solution.

Saltwater Resistant Resin

Availability: Contact Thorne & Derrick Sales for price, delivery and 3M Scotchcast 2131 stocks – 3M Electrical distributor since 1985.

Replaces 2130 Scotchcast Resin – Product Phase Out

Due to a raw material discontinuation, 3M Scotchcast Flame-Retardant Compound 2130 is being phased out. The replacement product will be 3M Scotchcast Flame-Retardant Compound 2131. Like its predecessor, Scotchcast Compound 2131 is a two-part polyurethane resin intended for similar applications and will be available in the same packaging configurations.

To assist with the transition to Scotchcast Compound 2131, we have compiled the following tables showing typical properties of the two products collected in parallel – see 2130 v 2131 Scotchcast Resins.

3M Scotchcast 2131 Resin

Flexible, Flame-Retardant & Submersible Resin Features

Flame-retardant resin
Bonds to most modern cable jackets and sheaths
Bonds to itself
Tough, yet flexible resin (semi-flexible)
Available in two-part closed mixing pouch for easy mixing and pouring
Excellent multi-purpose moisture sealing Scotchcast resin
Room temperature cure
Colour: Black

Resin 2131 should remain in the sealed container/envelope until ready to use. In cold weather, warm closed mixing pouch to 60°F (16°C) or warmer before mixing. Keep in a warm area, such as truck cab or inside pocket, until ready to use.

3M Scotchcast 2131 Resin

3M Scotchcast 2131 resin general instructions

Closed Mixing Pouch

Tear open the protective envelope and remove the closed mixing pouch
Before breaking the barrier, squeeze the bag to premix the separate components
Firmly grasp each flat side of the bag near the centre barrier, while pulling the sides of the barrier apart and rolling the sides of thumbs through the barrier. Break the barrier all the way across to the side seals
Alternately squeeze each end of the bag, forcing the resin back and forth (30 seconds)
Strip the resin from the corners of the bag and continue to mix until the color is uniform (additional 30 seconds, maximum)
Clip off a corner of the closed mixing pouch and pour

3M 2131 Resin Applications

To replace or repair the cable jacket or sheath on both single and multi-core power cables
To insulate between conductors of multi-core splices operating at up to 1000 volts
To seal the cable crotch or sheath when terminating multi-core cables
Potting cable or wire encasements
Potting cable fittings & splices
Potting printed circuit boards
Potting junction boxes and electrical enclosures
Filling back shell connectors
Potting for electric motor repairs

3M Scotchcast 2131 Resin – Technical Specification

3M Resin Type Physical Properties (Test Method)	Typical Value US units (metric)
Color	Black
Hardness (ASTM D2240)	82 Shore A
Density	0.703 oz/in³ (1,217 g/cm³ )
Tensile Strength (ASTM D412)	1038 psi (73,0 kg/cm² )
Elongation (ASTM D412)	339%
Glass Transition Temperature, Tg (DSC)	-103 ºF (-75ºC)
Maximum Exotherm, 100g (3M TM-67)	147ºF (64ºC) rise
Gel Time @ 75ºF (23ºC) (3M Method TM-67)	17 minutes
Viscosity (cP) @ 77°F (25°C) (3M Method TM-173) Part A Prepolymer Part B Polyol
	600 – 1,100
	4,000 – 10,000
Specific Gravity (ASTM D891) Part A Prepolymer Part B Polyol
	1.08
	1.29
Moisture Absorption (ASTM D471) 168 hrs. Immersion @ 212ºF (100ºC)
	4.9%
Adhesion to Metals (lb/in2 ) (3M TM-456) Copper Brass Steel Aluminum
	550.2
	274
	491.3
	221
Adhesion to Cable Jackets (lb/in2 ) (3M TM-457) Vinyl Neoprene Nylon XLPE
	125
	115
	>72
	208.5

Shelf Life & Storage Of Resins

3M Scotchcast Resin 2131 has a 3-year shelf life from date of manufacture when stored in the factory-sealed packaging under humidity controlled storage (10°C/50°F to 27°C/80°F and <75% relative humidity).

Resin Curing Times

Temperature	De-Mold Time	Approximate Cure Time Of 3M Scotchcast Resin Type 2131
70°F (21°C)	1.5 – 2 hrs	16 – 24 hours
50°F (10°C)	3.5 – 4 hrs	24 – 30 hours
32°F (0°C)	6 – 8 hrs	36+ hours