The Filoseal HD heavy-duty duct sealing kit is a certified engineering solution designed to deliver exceptional gas and water-tight protection for heavy power cables, large conduits, and multi-cable duct penetrations. Specially developed for demanding utility, industrial, and substation environments, this re-enterable system protects critical infrastructure against subterranean gas migration and water ingress under pressure.
Built to handle heavy electrical power cables, Filoseal HD features unique high-density hexagonal backing tubes. These flexible tubes wrap around complex cable geometry, ensuring optimal separation and structural support so heavy cables cannot sag or break the sealing face over time. Paired with Filoform’s specialized sealing mastic, the system adapts seamlessly to round, oval, or irregular boreholes.
Key Features of Filoseal HD
- Heavy Cable Support: Modular hexagonal tubes maintain cable separation and prevent structural sagging in large power transits.
- Gas & Water Tight: Resists high water pressure and prevents dangerous gas migration inside underground ducting.
- Chemical & Hydrocarbon Resistance: High resistance to Methane, H2S, and Hydrocarbon gases.
- Re-Enterable Design: Allows future cable additions or modifications without damaging surrounding infrastructure.
Installation Accessories
For efficient application on-site, use the Ultraflow Cartridge dispenser for smooth extrusion, and finish the surface with a damp Finishing Sponge. If active water leaks are present during installation, apply the Running Water Kit to divert flow prior to sealing.
| SKU |
Product name |
Duct diameter min-max (mm) |
Order unit |
| 280010 |
FiloSeal+HD – 75mm > 110mm |
Ø 110 max. |
per piece |
| 280020 |
FiloSeal+HD – 125mm > 160mm |
Ø 160 max. |
per piece |
| 280030 |
FiloSeal+HD – 180mm |
Ø 180 max. |
per piece |
| 280040 |
FiloSeal+HD – 200mm |
Ø 200 max. |
per piece |
| 280050 |
FiloSeal+HD – 225mm |
Ø 225 max. |
per piece |
| 280060 |
FiloSeal+HD – 250mm |
Ø 250 max |
per piece |
This video provides an overview of the FiloSeal+HD system, showing how it is installed and detailing its key technical features.
FiloSeal+HD is an engineered solution that provides a strong support system using the hexagonal tubes which builds up like a honeycomb structure. FiloSeal+HD is suitable for sealing any cable configuration or pipes contained in one duct and also allows easy re-entry of the seal to add or remove cables or pipes as required
The FILOform duct sealing system FiloSeal+HD uses our MD+ sealant which is easily applied from a standard skeleton gun. The high quality, one component, flexible sealant “MD+” is based on a silicon compound that cures with air (Humidity).
After application and full curing the thixotropic MD+ forms a plastic elastomer mass with special qualities effectively sealing and bonding, while providing a high level of durability.
FiloSeal+HD is very easy to apply regardless of the type of cable scenario in the cable ducts as it uses strong, but flexible hexagonal tubes to support the cable and provide a strong backing for the seal
The unique design of the hexagonal tubes makes positioning and separation of the cables very simple while also providing a strong backing for the MD+ to be applied on.
- Flexible, one component, adhesive and sealing compound in a cartridge – (310ml)
- Kits are complete with backing and mastic to fill an empty duct of the quoted kit size
- High levels of Gas and Water tightness
- Excellent adhesion, applicable to all common building materials
- Shows Fire resistance properties
- Resistant against Water, Alkaline, Chemical agents
- Resistant to termites (Mastotermes Darwiniensis) Northern Australian termites
- Resistant to Rats
- Resistant to Hydrogen Sulphide / Methane and many other Gases (NedLab)
- Non-corrosive
- Solvent-free
- Shock absorbing
- Non-toxic, neutral and almost odourless
- Also suitable for limiting the EX-zones during transitions (observe chemical resistance)
- Complies with 2011 NEC Articles 225.27, 230.8, 300.5(G), 300.7 (A) on Raceway Seals, and 501.15 (B)(2)
- Suitable for any shaped duct/borehole/opening
- WIMES Compliant (3.02 2013 6.4.3.2 b)
- Quick and easy installation
- A complete kit
- Seals all know materials, PVC & PE sheathed cables, PILC, (HD) PE pipes
- Engineering duct sealing solution
- Suitable for renovations, can be installed retrospectively
- Over 25 years of operational experience
Kits are complete with backing and mastic to fill an empty duct of the quoted kit size.
| Density |
1.2 gr/cm³ |
|
| Pressure |
up to 2 bar |
|
| Pulling Force |
100kg (1000 newtons) |
|
| Bend Test |
10xd at 45º, with 1 bar pressure |
|
| Flow |
< 2mm |
ISO 7390 |
| Colour |
red-brown |
|
| Skin over time (23C/55%RH) |
± 15 minutes |
|
| Curing |
3 mm / 24 hours |
|
| Hardness |
30 shore A |
DIN 53505 |
| Elongation |
100% |
DIN 53504 |
| Tensile strength |
0.8 N/mm² |
DIN 53504 |
| Operating temperature |
+5°C tot +40°C |
|
| Temperature resistance |
-40°C tot +120°C |
|
