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3M™ Scotchcast™ Flame-Retardant
Electrical Insulating Resin 2131
Data Sheet January 2015
Description
3M™ Scotchcast™ Flame-Retardant Electrical Insulating Resin 2131 is a two-part
polyurethane resin designed to replace the cable jacket when splicing or repairing mine
and portable cables. Its formulation makes it particularly suited to withstand the rugged
conditions under which mine and portable cables must operate.
Flame-Retardant Resin 2131 is also used as the insulating material for cable splices
operating at up to 1000 volts and designed for 194ºF (90ºC) continuous use/266ºF
(130ºC) overload.
Flame-retardant
Bonds to most modern cable jackets
Bonds to itself
Tough, yet flexible (semi-flexible)
Available in two-part closed mixing pouch for easy mixing and pouring
Excellent multi-purpose moisture sealing resin
Room temperature cure
Color: Black
Agency Approvals
& Self
Certifications
For RoHS information, please visit www.3M.com/ROHS
When used in accordance with the appropriate kit configuration, Flame-Retardant Resin
2131 meets Part 7, Title 30 CFR and carries the following MSHA approvals:
07-KA060002-MSHA 3M™ Scotchcast™ Flexible Power Cable Inline Splice Kit 82-F Series
3M™ Scotchcast™ Flexible Power Cable Tap Splice Kit 82-BF1
07-KA060007-MSHA
3M™ Scotchcast™ Mine and Portable Cable Splice Kit 8096 Series
3M™ Three-Conductor Inline Splice Kits 5750 and 5760 Series
3M™ Scotchcast™ Jacket Repair Kits M Series*
* The Flame-Retardant Resin 2131 is not included with the “M” Series kits and must be
ordered separately.
Resin
Applications
To replace or repair the jacket 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 crotch or sheath when terminating multi-core cables
Potting cable or wire encasements
Potting cable fittings & splices
Potting printed circuit boards
Potting junction boxes
Filling back shell connectors
Potting for motor repairs
Part B Fol 0| Part B Fol 0|
3M™ Scotchcast™ Flame-Retardant Electrical Insulating Resin 2131
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Typical Physical
and Electrical
Properties
Not for specifications. Values are typical, not to be considered minimum or maximum.
Properties measured at room temperature 73°F (23°C) unless otherwise stated.
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
V
iscosity (cP) @ 77°F (25°C) (3M Method TM-173)
Part A Prepolymer
Part B Pol
y
ol 600 - 1,100
4,000 - 10,000
Specific Gravity (ASTM D891)
Part A Prepolymer
Part B Pol
y
ol 1.08
1.29
Moisture Absorption (ASTM D471)
168 hrs. Immersion @ 212ºF (100ºC)
4.9%
Adhesion to Metals (lb/in
2
) (3M TM-456)
Copper 550.2
Brass 274
Steel 491.3
Aluminum 221
Adhesion to Cable Jackets (lb/in
2
) (3M TM-457)
Vinyl 125
Neoprene 115
Nylon >72
XLPE 208.5
Electrical Properties (Test Method) Typical Value
Dielectric Strength (ASTM D149) 343 V/mil (13,5 kV/mm)
Dielectric Constant, @ 60Hz
(ASTM D150)
5.22 @ 73ºF (23ºC)
6.33 @140ºF (60ºC)
6.56 @194ºF (90ºC)
Dissipation Factor, @ 60Hz
(ASTM D150)
5.6% @ 73ºF (23ºC)
7.9% @140ºF (60ºC)
17.0% @194ºF (90ºC)
General Instrucflons
3M™ Scotchcast™ Flame-Retardant Electrical Insulating Resin 2131
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Usage & Handling
IMPORTANT:
Product 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.
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 center 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
Bulk Components:
Measure the appropriate quantity of each component as indicated in the table below, then
thoroughly mix to a uniform color and consistency prior to use. Opened bulk components
should be blanketed with nitrogen to prevent moisture contamination.
Component Color Weight Ratio
(w/w) Volume Ratio
(v/v)
Part A Pale Yellow 1 1
Part B Black 2.1 1.69
Typical De-Mold/Cure Time:
NOTE: Values are typical, not to be considered minimum or maximum. Always confirm
that material is no longer tacky prior to de-molding.
Safety Precautions:
Read all Health Hazard, Precautionary and First Aid statements found in the Safety Data
Sheet (SDS) and/or product label of chemicals prior to handling or use.
Wear protective gloves when using this product.
Temperature De-Mold Time Approximate Cure Time
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
F CAUTION
Working around energized electrical systems may cause serious injury or
death. Installation should be performed by personnel familiar with good safety
practice in handling electrical equipment. De-energize and ground all electrical
systems before installing product.
3M™ Scotchcast™ Flame-Retardant Electrical Insulating Resin 2131
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Shelf Life &
Storage
3M™ Scotchcast™ Flame-Retardant Electrical Insulating 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).
Availability
Please contact your local distributor or call 1.800.245.3573.
3M and Scotchcast are trademarks of 3M Company.
Important Notice
All statements, technical information, and recommendations related to 3M’s products are based on
information believed to be reliable, but the accuracy or completeness is not guaranteed. Before
using this product, you must evaluate it and determine if it is suitable for your intended application.
You assume all risks and liability associated with such use. Any statements related to the product,
which are not contained in 3M’s current publications, or any contrary statements contained on your
purchase order, shall have no force or effect unless expressly agreed upon, in writing, by an
authorized officer of 3M.
Warranty; Limited
Remedy; Limited
Liability
This product will be free from defects in material and manufacture at the time of purchase. 3M
MAKES NO OTHER WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. If this
product is defective within the warranty period stated above, your exclusive remedy shall be, at
3M’s option, to replace or repair the 3M product or refund the purchase price of the 3M product.
Except where prohibited by law, 3M will not be liable for any direct, indirect, special,
incidental or consequential loss or damage arising from this 3M product, regardless of the
legal theory asserted.
3
Electrical Markets Division
6801 River Place Blvd.
Austin, TX 78726-9000
800.245.3573
Fax 800.245.0329
www.3M.com/electrical
Please recycle
© 3M 2015 All rights reserved
78-8129-9502-1 Rev D

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