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Duct Seal LG Cable Duct Sealing System (cables <25mm Ø) - ≤1 Bar Pressure Resistance


Duct Seal LG (Water & Gas) is a NEW re-enterable duct sealing system that is extremely flexible in its ability to seal cables & pipes in ducted networks to protect and stop the ingress of harmful or flammable gases, liquids, smoke and vermin.

Duct Seal LG comes complete with our unique daisy-chained circular foam tubes that easily wraps and separates cables to ensure limited movement while applying our NEW flexible intumescent, zero halogen and zero Meko adhesive and sealing compound, GreyStuff. All designed and manufactured in the UK. 

Duct Seal LG, along with Grey Stuff, is a non-hazardous, FyBrid superior single-component, neutral curing sealant that has been specifically developed to cope with the harsh environments around duct openings to ensure ducted networks and penetrations are protected.

Key Features:

  • Revolutionary circular foam backing system
  • MEKO-free, Fybrid, Non-Hazardous Intumescent sealant 
  • Water & Gas Tight
  • Resists Toxic Gases - Ideal for the Water Industry (methane,  chlorine, & hydrogen sulfide)
  • Resists Hydrocarbons - Perfect for the Petrol Forecourt industry
  • Flame Retardent - tested to UL94: 2013 ANSI / UL 94: 2018
  • Microbial Defence - boosted to resist fungi & bacteria
  • MADE IN UK - All components are designed and manufactured locally

Areas of Application:

  • Waste Water Treatment Works 
  • Fuel / Petrol Filling Stations
  • Telecommunications
  • For all construction sectors, best suited for smaller cables below 25mm

If you have large, heavy cables, then it's best to use DuctSeal HG

Product No. Product Duct
Opening Max
Max Single
Cable Ø
Unit Sold
Using 1 x Duct Seal LG Kit – 50 to 125mm
DSLG125 Duct Seal LG 125mm 100mm x1 Kit
Using 2 x DuctSeal LG Kit – 150 to 200mm
DSLG200 Duct Seal LG 200mm 175mm x2 Kits

One Kit per Box
All components included to seal 1 x duct as per the kit size mentioned (Caulking gun not included, but can be sold separately). ** One kit may fill more than one duct, depending on cable % fill. Call 0161 806 1666 for advice**

Cable Separation
It’s imperative to ensure separation between each cable and from the inside of the duct. Our unique daisy-chained circular tubes easily separates and supports single or multiple cables.

Running Water
The duct & cables should be dry for best results with no running water. All dirt, oil or grease must be cleaned before applying GreyStuff. If you have running water, please contact AC Cable Solutions for advice on 0161 806 1666. Most of the time, we recommend using a Kraso Mechanical seal - Click here for further information. 

Cure Time
Grey Stuff will cure 3-4mm daily, depending on the Humidity and temperature. The higher the humidity %, and temperature, the quicker GreyStuff will cure. A minimum requirement of 20mm GreyStuff is required for an effective seal.

Uncured material spillages can be cleaned with a solvent-based wipe.

Health & Safety
Grey Stuff is based on a neutral curing system that is hazardous-free to protect users when carrying out tasks like sealing cable ducts. Non-hazardous Zero MEKO.


Re-entry & Removal
Grey Stuff will cure to a similar hardness to a rubber eraser, so re-entry and removal are achievable. The ease of this depends on the type of tools used. For example, a sharper tool will be easier than a blunt-ended tool. Only use sharp tools when cables are de-energised. AC Cable Solutions accepts no responsibility for damaged cables.

Cable Suitability
GreyStuff is a single-component neutral curing system containing no solvents. Our formulation does not damage the properties of a cable sheath or stain surfaces.

Grey Stuff should be kept in a cool, dry environment and away from sunlight. The product shelf life is 12 months. Once opened, any remaining product can still be used for 1 month afterwards, provided the screwcap is securely fitted.

Features & Standards
Water & Gas tight to 1.0 bar Feature Measurement
Non-slumping Density 1.27
High bonding strength Colour Anthracite Grey
Odourless when curing Skin Over Time 10 mins
Flexible Curing 3-4mm per day
Intumescent Tack free time 22 mins
Very strong porous sticky char is formed when exposed to fire, which has excellent thermal insulation properties. Hardness 35 to 38 Shore A
Microbial resistance – coverage against Fungi, E-Coli, Escherichia coli, Staphylococcus aureus, & A. brasiliensis Elongation 250%
UV & Ozone resistant Flow
3.33 million cPs at 380°C
Non-hazardous Tensile strength
0.72 N/mm^2
Zero halogens used Operating Temperature +5 to 40°C
Emits 0% MEKO Temperature Resistance -35 to +120°C
Resistant to Hydrocarbons (Petrol, Diesel, ASTM oil, & LPG Gas) Intumescence Activation Temperature 210°C
Resistant to Methane, Hydrogen Sulphide, & Chlorine gas – Independently tested. Pressure Resistance 1.0 Bar
Resistant to many other gases & liquids, for example, ADBLUE, & Antifreeze. Shelf Life 12 months
Complies with DSEAR duct sealing regulations
WIMES compliant, as described in the WIMES Specification in section, 3.02 2019 clause
Complies with 2011 NEC Articles 225.27, 230.8, 300.5(G), 300.7 (A) on Raceway Seals, and 501.15 (B)(2)
Petrol station forecourt accepted, as per the technology described in the APEA Blue book - 4th Edition, 4.6.8
ATEX Compliant – Contains no moving parts or any form of material that can create a spark