800-268-0568 ~ PROUDLY CANADIAN SINCE 1959 Authorized 3M Distributor
PROUDLY CANADIAN SINCE 1959 ~ Authorized 3M Distributor 1- 800-268-0568
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Flame-retardant electrical insulating resin
3M™ Scotchcast™ Flame Retardant Compound 2131B is a two-part polyurethane resin designed to replace or repair cable jackets and protect electrical connections in rugged operating environments. Once cured, the black compound provides a semi-flexible, flame-retardant barrier with strong electrical insulation, moisture sealing, and mechanical protection.
Scotchcast™ 2131B combines electrical insulating performance with the flexibility and toughness required for mine, portable, single-core, and multi-core power cables. The closed pouch keeps both components separated until use and supports mixing and pouring without open-container measuring.
The cured resin forms a flame-retardant layer suited to cable jacket replacement, splice insulation, and electrical potting applications.
Typical 82 Shore A hardness and 339% elongation help the cured material withstand movement, thermal shock, and mechanical shock.
High dielectric strength supports insulation in low-voltage cable splices operating at up to 1 kV.
The permanent polyurethane resin provides multipurpose sealing and bonds to itself and many modern cable-jacket materials.
The resin is designed for electrical sealing, insulation, and mechanical protection. Always evaluate compatibility and follow the applicable 3M kit or installation instructions for the cable construction and voltage class.
| Product type | Two-part flame-retardant electrical insulating resin |
|---|---|
| Resin chemistry | Polyurethane |
| Cured colour | Black |
| Cured flexibility | Semi-flexible |
| Package size | 213 g (7.5 oz) closed mixing pouch |
| Case quantity | 10 pouches |
| Voltage class | Low voltage, up to 1 kV |
| Typical gel time | 17 minutes at 23°C (73°F) |
| Typical hardness | 82 Shore A, ASTM D2240 |
| Typical tensile strength | 1,038 psi, ASTM D412 |
| Typical elongation | 339%, ASTM D412 |
| Typical dielectric strength | 343 V/mil (13.5 kV/mm), ASTM D149 |
| Temperature rating | 90°C (194°F) continuous; 130°C (266°F) overload |
| 3M catalogue number | 2131-217G |
| 3M stock number | 7000006239 |
| UPC | 00051128591666 |
| Country of origin | United States |
Technical values are typical only and are not intended as minimum, maximum, or specification values. Performance and cure behaviour depend on temperature, mixing quality, installation method, cable construction, and application conditions.
| Temperature | Typical de-mould time | Approximate cure time |
|---|---|---|
| 21°C (70°F) | 1.5 to 2 hours | 16 to 24 hours |
| 10°C (50°F) | 3.5 to 4 hours | 24 to 30 hours |
| 0°C (32°F) | 6 to 8 hours | 36 hours or longer |
Times are typical. Confirm that the compound is no longer tacky and has developed suitable hardness before de-moulding or returning the repair to service.
De-energize, lock out, and ground all electrical systems before installation. Work should be performed by personnel trained in safe electrical practices and familiar with the applicable splice, repair, or potting procedure.
This two-part chemical system can cause serious health effects. Avoid breathing vapours, use adequate ventilation, and wear the eye, face, skin, and respiratory protection required by the current Safety Data Sheets and workplace exposure assessment. Review the product label, both component Safety Data Sheets, and the applicable 3M installation instructions before handling or use.
It is used to replace or repair cable jackets, insulate conductors in low-voltage cable splices, seal cable crotches and sheaths, and pot electrical components such as cable fittings, junction boxes, printed circuit boards, connectors, and motor repairs.
Yes. The product is a two-part polyurethane resin supplied in a closed mixing pouch. The components remain separated until the internal barrier is broken and the pouch is mixed according to 3M instructions.
At 21°C (70°F), typical de-mould time is 1.5 to 2 hours and approximate cure time is 16 to 24 hours. Lower temperatures extend both times. Confirm cure by tack and hardness rather than time alone.
3M identifies the resin for cable-splice insulation operating at up to 1 kV, with a continuous temperature rating of 90°C (194°F) and an overload rating of 130°C (266°F). The complete installation must follow the applicable cable and splice-system requirements.
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