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.
This duct sealing system is highly flexible and can be installed in vertical and horizontal duct or boreholes, and is suitable for boreholes drilled at an angle.
The MD5 duct sealing system 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.
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.
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.
Should any un-mixed material spill onto a surface, a solvent wipe can be used to help clean the area.
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)
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.
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.
Specifications & Standards
|Start time expansion||Seconds||50-70|
|End time expansion||Minutes||8-10|
|Curing time (Tack-Free time)||Minutes||>12|
|Compressive strength||N / cm²||>60|
|Density||kg / m³||90-110|
|Thermal resistance long term||°C||100|
|Closed cell percentage||%||>90|
|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|
|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|
|0,1N Na₂SO₄||30 days||PASS|
|0,1N NaCl||30 days||PASS|
|0,1N H₂SO₄||30 days||PASS|
|0,1N NaOH||30 days||PASS|
|H2S, 200 ppm||5 days, 40°C, 95% air humidity||PASS|
|Storage time before use, under restricted conditions||Months||18|