Description
3M™ Scotchcast™ MR408 resin is a black, semi rigid, two-part polyurethane infill compound. The system has low viscosity and exhibits good adhesion to plastic, XLPE, PVC, nylon and all types of metals. Once cured the resin exhibits durability and impact resistance and provides excellent protection against moisture, salt, oil and many types of chemicals.
Application
For the encapsulation of all types of cable joints, power cables, telecommunications and fibre optic cables, with copper or aluminium conductors.
Features
Certified to CENELEC HD 631.1 S2 standard with LMP-W and MMP-W classifications. Low exothermic reaction temperature.
Specification
| PROPERTIES OF THE COMPONENTS – | BASE | HARDENER |
| Viscosity @ 25°C (poise) | 6-10 | 1-2 |
| Specific gravity (g/cm³) | 0.98 – 1.02 | 1.20 – 1.26 |
PROPERTIES OF THE MIXTURE –
| Mix ratio base: hardener | 2.25:1 pbw |
| 2.75:1 pbv | |
| Viscosity @ 25°C | 2 – 4 poise |
| Specific gravity | 1.05 – 1.07 g/cm³ |
| Pot life 300g @ 5°C | 40 min. |
| Pot life 300g @ 23°C | 20 min. |
| Pot life 300g @ 40°C | 11 min. |
CURE CHARACTERISTICS
| Method | Result | |
| Exotherm 300g @ 40°C | 7.3 | 82°C |
| Cure under water @ 23°C | 7.6 | <10ml gas volume |
| Volume shrinkage | ISO 3521 | 3.8% |
| Shore A 24 hours cure @ 23°C | 72 | |
| Shore A 24 hours cure @ 50ºC | 85-90 | |
| 500 grams mass (hard) @ 23°C | 3 hrs | |
| 500 grams mass (full) @ 23°C | 48hrs |
PROPERTIES OF CURED COMPOUND
| Tensile strength | ISO 527 | 3.2 MPa |
| Elongation at break | ISO 527 | 99.7 % |
| Water absorption | ISO 62 | 0.15 % |
| Electrolytic corrosion | DIN 53489 | A1 |
| Dielectric strength | IEC 243 | 200 kV/cm |
| Dielectric constant | IEC 250 | 4.1 50Hz |
| Dissipation factor | IEC 250 | <0.01 50Hz |
| Volume resistivity Log10 ohm | IEC 93 | >14 ohm/mm |
Usage Information
The resin will be supplied in the correct proportion in two-chamber pouches with peelable barrier. This type of packaging will ensure the correct mixing ratio for applying the resin. Peel open the barrier and mix the contents by using the fingers and thumbs. Ensure that the material in the corners and edges of the pack are well mixed. The mixing process should take 2-3 mins. Care should be taken not to burst the pack by over-rigorous mixing. Cut off the corner and pour out the mixed resin.
Storage
3M™ Scotchcast™ MR408 resin has a shelf life of 36 months when stored between 10°C and 40°C in the original sealed bag. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, it is the responsibility of the user to determine the applicability of the resin.
Safety and Handling
3M provides its customers with a product specific Material Safety Data Sheet (MSDS) to cover potential health effects, safe handling, storage, use and disposal information. 3M strongly encourages its customers to review the MSDS on its products prior to their use.
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