Duct Sealing System | Filoform MD5
Filoform MD5 Sealing System
DUCT SEALING System | Filoform MD5
Filoform MD5
The MD5 duct sealing system manufactured by Filoform, uses a specially formulated two-component expanding polyurethane resin. The polyurethane sealant is supplied in a two-component cartridge. The two liquid parts are formulated to be mixed at a 1:1 ratio, using the 2K cartridge and mixing nozzle provided.
Duct sealing systems MD5 are designed to provide an effective and straightforward solution for gas and watertight sealing of one or multiple cables/conduits in ducts or boreholes. MD5 protects against damage caused by gas and water leaks.
Filoform MD5’s resin can be installed in temperatures from 5°C (41°F). In colder temperatures, expansion can be slower but will expand and cure over a more extended time. Expansion time between 8-10 minutes at temperature ranging between 15-20°C.
Contact us to discuss sealing material calculations for LV MV HV applications including substation ducts with 11kV 33kV 66kV 132kV power cables – we can provide expert technical support by site survey and product training to ensure competent installation of all Filoform Filoseal Systems.
Sealing Cable Ducts With MD5 Sealing System
MD5 DUCT SEALING SYSTEMS: step by step method
- The two liquid parts are formulated to be mixed at a 1:1 ratio, using the 2K cartridge and mixing nozzle provided.
- After injecting the resin into the duct, the resin starts expanding by forming CO². During the expansion, the polyurethane resin penetrates all areas between the two foam flanges inside the duct. MD5 is suitable for all openings regardless of the shape of the duct or borehole and cable configuration.
- After full curing, the Filoform two-component resin provides a 100% gas and watertight seal and offers excellent mechanical strength & rodent resistance. MD5 duct sealant is compatible with common cable jacket /sheath materials and PE drinking water conduits. The cured duct sealant is an inert solid mass that does not affect any of the materials inside of the duct.
- The MD5 system has been designed to support and separate multiple cables in a duct / conduit using our uniquely designed duplex foam, whilst reducing excess expansion of resin out the front of the duct; This ensures a neater, less messy professional finish. The opening of the duct does not need to be completely round.
Installation
- One box solution
Everything needed to seal one duct end (except a caulking gun). - Cable Separation
It is vital, to make sure the duplex foam is wrapped around each cable, to create separation from each other and the inside of the duct. - Running water
The duct & cables must be as dry as possible with no running water and free from any dirt, oil, grease & debris. MD5’s resin can cope with small amounts of moisture in the duct or on the cables, but larger amounts of water will reduce the effectiveness. Please contact our technical department if you have any questions.
Reentering & removal
Properties of Cured resin: Fairley dense structure however can be dug out with a blunt tool & Hammer with some degree of difficulty.(Please note there is between 10-15 cm (4-6”) of the expanding resin in each seal depending on the size of duct)
- Remove all of the front foam that is separating the cables with a pair of pliers or cutting tool
- Using a hammer & chisel or similar tool to break the seal around the cable and the inside of the duct
- If there is room and the cables are de-energized, a power tool to speed the process up could be used. Once the seal is broken from the cable, there may be a crust of resin still present on the cable; this is due to the excellent adhesion our resin has. The hardest part of removing this seal is the crust that forms when the resin soaks into the foam flange.
Safety
MD5’s specially formulated two-component resin is part of the same chemical/product family of similar electrical and construction industry products. These products have been widely used for decades. As with all two-component resins safety precautions must be understood to handle and install these types of materials.
MD5’s resin is contained in a state of the art 2K cartridge, which reduces contact with the raw materials. When the two components are mixed, the resin expands and forms a high density, closed-cell polyurethane foam and is inert and non-toxic when fully cured.
Storage conditions
The cartridges should be kept in a cool, dry environment and away from direct sunlight. Product shelf life is 18 months, and providing the cap is correctly inserted after use, then remaining product in the cartridge can be used within two months of opening.
MD5 Cable Duct Sealing System specifications
- Gas and watertight up to 1.5 bar / 21 PSI (30 days)
- Gas and watertight up to 2.5 bar (7 days)
- After injecting, the polyurethane sealant will expand and cures/hardens with a high density and a closed cell structure
- Easy and quick installation
- One complete kit – Everything you need except for a standard caulking gun
- Suitable for single & multiple cables
- Compatible with a wide range of cable and conduit materials: PVC & PE sheathed cables, PILC cables, (HD)PE ducts, & PE drinking water conduits • High mechanical strength, resists ground movement, shocks and vibrations
- Complies with DIN 18322 underground cable laying works – gas & watertight cable and conduit entries into buildings • Complies with 2011 NEC Articles 225.27, 230.8, 300.5(G), 300.7 (A) on Raceway Seals, and 501.15
| Curing properties | Unit | Value |
| Start time expansion | Seconds | 50-70 |
| End time expansion | Minutes | 8-10 |
| Curing time (Tack-Free time) | Minutes | >12 |
| Specifications | ||
| Compressive strength | N / cm² | >60 |
| Density | kg / m³ | 90-110 |
| Thermal resistance long term | °C | 100 |
| Closed cell percentage | % | >90 |
| Thermal stability | ||
| Thermal aging, 28d 90°C | no visual damage | V |
| Form stability, size and visual | % | <1 |
| Compression strength after aging | N / cm² | >40 |
| Weight loss after aging | % | <0,5 |
| Hydrolysis test | ||
| Water absorption, at 40 years, fully immerged | % | <10 |
| Water absorption 28 days at 90 °C | % | <5 |
| Weight loss max. | % | 0,5 |
| Compression strength after Hydrolysis test | N / cm² | >40 |
| Form stability after Hydrolysis test | Visual | PASS |
| Chemical resistance | ||
| 0,1N Na₂SO₄ | 30 days | PASS |
| 0,1N NaCl | 30 days | PASS |
| 0,1N H₂SO₄ | 30 days | PASS |
| 0,1N NaOH | 30 days | PASS |
| Diesel | 30 days | PASS |
| Gasoline | 30 days | PASS |
| H2S, 200 ppm | 5 days, 40°C, 95% air humidity | PASS |
| Resistance | ||
| Mold | Good | |
| Rodents | Good | |
| Shelf life | ||
| Storage time before use, under restricted conditions | Months | 18 |
ordering information
| Part Reference | Product Name | Cable Duct Diameter min-max | Order Unit |
| 80347
80345 |
MD5-160mm | ∅ 160 max. | Per piece |
| MD5-110mm | ∅ 110 max (set for 2 seals) | Per piece |
MD5 Duct Sealing Resin
Assessing the particular duct seal scenario and determining the project’s goals are important when selecting an efficient seal. Taking into account elements such as :
- Cable Presence
- Water blocking specifications
- Fire Stop standards
- Building entrance points
- Gas and chemical problems
Sealing Ducts require precision, a professional would strongly advise against using DIY expanding foam for this purpose due to potential complications. For guidance in your enquiries please contact us today!
| Properties | MD5 Duct Sealing Resin – Two Components |
| Cell Structure | 100% closed, small, strong, durable |
| Expansion Rate | 8 x volume – Slow & easy to control |
| Temperature Resistance | +248°F / +120°F |
| Compressive Strength | 60 Newtons / 14 pounds of force |
| Resistance to Hydrocarbons | Yes |
| Water Resistant | Yes permanently – upto 1.5 bar / psi |
Key to an effective seal
- Training and preparation – read and follow manufacturers instructions. This requires knowledge and skill.
- Sealing system selection – most underground duct sealing systems will need to block water and gases and tolerate hydrocarbons. If the duct enters the building, a fire stop may be required so you need to select a sealing system that addresses the risk present.
- Cable separation – this is a area where most duct seals will fail ; either the product doesn’t support cable separation, or the installer has been unable to separate the cable sufficiently. Without separation, water and gases will simply wick through areas without the sealant.
- Conduit sealing – our range of conduit sealing systems have been designed to provide a simple and effective solution for watertight and gas sealing of pipes and cables in conduits, boreholes and ducts. Conduit sealing systems can be installed horizontally and vertically; they are very flexible.
Thorne & Derrick International are the UK distributors for Filoform, a leading manufacturer of cable joints, duct seals and special resins for installation in the utilities, telecom, traffic, rail, fibre optic, street lighting and construction industries.
Duct sealing and sealing products manufactured by Filoform are installed to protect underground cables and substation ducting infrastructure against flood and migration of flammable and toxic gas hazards. Fire resistant version also available – suitable for sealing LV-HV power, telecoms and fibre optic cables.
Thorne & Derrick provide competitive prices and fast delivery from stock for the complete range of Filoform duct seals and cable joints.
View the complete range of Filoform products below.
FiloSeal+HD Duct Sealing System
MD5 Duct Sealing System – Data SheetDownload
