Published on:2026-05-24 Click:21
3M Scotchcast electrical insulating resin for underwater cable splices, connector potting, and subsea joint encapsulation. Excellent moisture resistance and electrical properties.
3M Scotchcast is the industry-standard two-component electrical insulating resin for potting, encapsulating, and sealing underwater cable splices, connector bodies, and subsea joint assemblies. Its cured form provides excellent moisture and seawater resistance, high dielectric strength, and strong adhesion to cable jackets, connector housings, and metal surfaces -- making it the preferred choice for ROV tether repair, subsea junction box potting, and connector encapsulation in marine environments.
| Parameter | Specification |
|---|---|
| Brand / Type | 3M Scotchcast (electrical insulating resin) |
| Form | Two-component epoxy (Part A + Part B) |
| Mix Ratio | Per 3M data sheet (by volume) |
| Pot Life | Typically 20--40 min at 23°C |
| Cure Time | 16--24 h at 23°C (full cure) |
| Dielectric Strength | >20 kV/mm |
| Water Resistance | Excellent (seawater and fresh water) |
| Shore Hardness | Rigid (Scotchcast 2131 series) or flexible (per grade) |
Order 3M Scotchcast with the correct grade for your application: sales@rovcable.com -- Shanghai Kabel Intelligence Technology Co., Ltd.
3M Scotchcast 2131 (rigid, black) is widely used for subsea cable splices requiring mechanical rigidity and seawater resistance. 3M Scotchcast 4 (semi-flexible) is preferred where some cable flexibility at the joint is required. Contact us with your cable OD, jacket material, and operating depth, and we will recommend the correct grade.
3M Scotchcast resins are designed for use in dry environments during application (the resin must be poured and cured dry). Once cured, the encapsulation is rated for long-term submersion and seawater exposure. Wet or underwater mixing is not recommended -- assemble and pot the joint above water, allow full cure, then deploy.
