Filoform MDII Duct Sealing System (MDII-50, MDII-110, MDII-125, MDII-160, MDII-200, MDII-250)

Product overview

Filoform MDII Duct Sealing System has been developed to provide an effective and simple solution for all your Gas and Watertight duct sealing requirements. Seals internally & externally around the outside edge of the duct. Suitable for ducts with a diameter of 40mm up to 200mm and cables or pipes with a diameter up to 160mm.
Filoform Part Numbers: MDII-50 (280271P), MDII-110 (280261), MDII-125 (280251), MDII-160 (280241), MDII-200 (280246), MDII-250 (280247).

Filoform Duct Sealing Systems provide an effective gas and watertight seal of underground cable penetrations and protect valuables from damage appearing due to gas and water leaks. They are specified and used by major Electrical, Gas, & Water Utility companies in the UK and Benelux countries.

Filoform MD Duct Sealing System Expansion

Application Process

Filoform duct seals type MD are based on a specially formulated two-component expanding polyurethane resin. The polyurethane sealant comes in a transparent plastic bag with a screw ring. In this plastic bag, a clamping profile separates the two components. After removal of the clamping profile, the two components are simply mixed together for 30 seconds. The package is now ready for use and can be easily opened with the use of the screw nipple.

After pouring the resin in the duct, the resin starts expanding by forming CO². During the expansion the polyurethane filling material penetrates all areas inside the duct, thus sealing all openings regardless of the shape of the duct or borehole. After this the hardening process starts. The Filoform two component filler provides not only a 100% gas and watertight seal but also offers excellent mechanical strength.

The MDII system (MDII-50, MDII-110, MDII-125, MDII-160, MDII-200, MDII-250) is suitable in situations where more than one cable or pipe is in the duct. The opening of the duct does not need to be completely round.

Filoform MDII Duct Sealing System Drawing

Filoform MDII Duct Sealing System – Key Features

  • Gas- and watertight 1,0 bar
  • Suitable for use in any shaped or sized duct up to 200mm
  • Easy and quick installation
  • One complete kit for sealing of one duct
  • Seals all known materials: 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

For Additional Information on Filoform MDII Duct Sealing System (MDII-50, MDII-110, MDII-125, MDII-160, MDII-200, MDII-250), please refer to the Technical Data Table below or download PDF File.

FREE Technical Advisory Service
E-Tech Components UK Ltd maintains a free technical advisory service.
Contact us for enquiries concerning this and all other products: +44 (0) 1744 762 929

Technical Data

Part Number Product Name Duct Diameter
Min - Max (mm)
Max 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. Ø 130 max. per piece
280246 MDII-200 duct sealing kit Ø 200 max. Ø 160 max. per piece
280247 MDII-250 duct sealing kit Ø 250 max. Ø 200 max. per piece

Expanding Resin Specifications

Properties Unit Value
Start time expansion seconds > 95
End time expansion minutes 15
Compressive strength N / cm² > 60
Gas and water tightness 1,0bar 30 days no leakage
Density 10m 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
Moulds: good
Rodents: good
Shelf life: months - minimal 30

Kit Contents

  • Conical cap with sealing cap
  • Foam support block
  • Self-adhesive foam strip
  • Flexible cord
  • Expanding polyurethane filler
  • Screw nipple
  • Set protective gloves
  • Sandpaper
  • Installation instructions

Product Video

Find out more about our products or becoming a supplier