Duct Seals – Filoform MDII Water & Gas Cable Duct Sealing Kits

Duct Seals – Filoform MDII Water & Gas Cable Duct Sealing Kits
Filoform MDII is a watertight and gastight cable duct sealing system developed for sealing ducts internally and externally around the outside edge of the duct.
The MDII duct seal system allows these cables to be sealed along a wall where the cable enters a building and is suitable for ducts with a diameter of 40mm up to 200mm and cables or pipes with a diameter up to 160mm.
This duct sealing system is specified and used by major Electrical, Gas, & Water Utililty companies in the UK and Benelux countries.

Duct Seals – Filoform MDII Water & Gas Cable Duct Sealing Kits
Water & Gas Cable Duct Sealing Kits
Features & Benefits
- Gastight and watertight cable duct seals up to 1,0 bar
- Can be used in any shaped or sized cable duct up to 200mm
- Easy and quick installation
- One complete kit for sealing of one duct
- Seals XLPE EPR PVC & PE sheeted cables, PILC cables, (HD)PE pipes, PE drink water conduits
- High mechanical strength, resists ground movement, shocks and vibrations
- Also suitable for renovation works
- No architectural measures necessary
- Used by various utility companies as well as contractors
- Over 25 years of operational experience

Filoform MDII Water & Gas Cable Duct Sealing Kit
Duct Seals – Filoform MDI Water & Gas Cable Duct Sealing Kits
Technical Specification
Duct Seal System Properties | Unit | Value |
Start time expansion | seconds | > 95 |
End time expansion | minutes | 15 |
Compressive strength | N / cm² | > 100 |
Density 0,5bar | 30 days | no leakage |
Density 5m water column | 30 days | no leakage |
Volume consistency | cube 10 x 10cm | no change |
Temperature Cycles, -20°C tot +40°C | 10 consecutive cycles | no leakage |
Vibration test 10 Hz/amplitude 3mm | 240 hours | no leakage |
Axial tensile force | diameter x 10 N | no leakage |
Resistance to bending | cables 45° in 2 directions >250mm | no leakage |
Expansion polyurethane foam in pipe | cm | < 40 |
Temperature resistance | °C | +120 |
Chemical resistance | ||
0,1N Na₂SO₄ | 30 days | no degradation |
0,1N NaCl | 30 days | no degradation |
0,1N H₂SO₄ | 30 days | no degradation |
0,1N NaOH | 30 days | no degradation |
Diesel | 30 days | no degradation |
Gasoline | 30 days | no degradation |
Resistance | ||
Moulds | good | |
Rodents | good | |
Shelf life | months | minimal 30 |
Filoform MDII – Product Specification
Filoform Part Number | Cable Duct Seal Description | Maximum Duct Diameter (mm) | Maximum Cable Diameter In The Duct (mm) | Order Unit |
---|---|---|---|---|
280271P | MDII-50 Duct Sealing Kit | Ø 50 max. | Ø 40 max. | per piece |
280261 | MDII-110 Duct Sealing Kit | Ø 110 max. | Ø 70 max. | per piece |
280251 | MDII-125 Duct Sealing Kit | Ø 125 max. | Ø 90 max. | per piece |
280241 | MDII-160 Duct Sealing Kit | Ø 160 max. | max. Ø 130 | per piece |
280246 | MDII-200 Duct Sealing Kit | Ø 200 max. | max. Ø 160 | per piece |
280247 | MDII-250 Duct Sealing Kit | Ø 250 max. | Ø 200 max. | per piece |

Filoform MDII Duct Sealing System

Sealing Cable Ducts With Roxtec – cable transits and sealing modules consist of two halves with removable layers and a centre core which is removed to permit cable or pipe installation in medium/high voltage substations, hazardous areas and electrical infrastructure

Cable & Duct Sealing Transit Frames – T&D Approved Roxtec Distributor