GP® DuctSeal HG (Water & Gas) is a NEW duct sealing system that is extremely flexible in its ability to seal large, heavy cables & pipes in ducted networks to protect and stop the ingress of harmful or flammable gases, liquids, smoke and vermin.

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Product Benefits

  • Complies with DSEAR duct sealing regulation
  • WIMES compliant
  • 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 ATEX
  • Complaint – contains no moving parts or any form of material that can create a spark
  • Flame Retardant – tested to UL94
Product Description

GP® DuctSeal HG comes complete with our PATENT PENDING unique tubular rubber backing system that can be joined together in a long continuous strip, joined to make a ring/collar, but best of all, joined in a cross shape to create a perfect shape for separating refoil/triplex cables.

This unique design endures DSEAR compliance but also aids the installer as it’s simple & quick to create the support & separation on large cables or pipes. The PATENT PENDING ULTIMATE backing system, which is one of a kind, is combined with our NEW Fybrid flexible intumescent, zero halogen, & zero Meko adhesive and sealing compound, Grey Stuff.

All are designed and manufactured in the UK.

GP® DuctSeal HG, along with Grey Stuff, is a non-hazardous, 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.

GP<sup>®</sup> DUCTSEAL <sup>HG</sup> +GREY STUFF
Part No. Product Duct Opening Max Unit sold
Using 1 x GP® DuctSeal HG Kit up to 100mm
DSHG100 GP® DuctSeal HG 100mm 1 x DSHG 100 Kit
Using 2 x GP® DuctSeal HG Kit up to 100mm
DSHG150 GP® DuctSeal HG 150mm 2 x DSHG 100 Kit
Using 3 x GP® DuctSeal HG Kit up to 100mm
DSHG200 GP® DuctSeal HG 200mm 3 x DSHG 100 Kit
Using 4 x GP® DuctSeal HG Kit up to 100mm
DSHG225 GP® DuctSeal HG 225mm 4 x DSHG 100 Kit
Using 5 x GP® DuctSeal HG Kit up to 100mm
DSHG250 GP® DuctSeal HG 250mm 5 x DSHG 100 Kit


  • Water & Gas tight to 2.0 bar
  • Non-slumping
  • High bonding strength
  • Odourless when curing
  • Flexible
  • Intumescent
  • UV & Ozone resistant
  • Non-hazardous
  • Zero halogens used
  • Emits 0% MEKO
  • Very strong porous sticky char is formed when exposed to fire, which has excellent thermal insulation properties
  • Microbial resistance – coverage against fungi, E-Coli, Escherichia coli, Staphylococcus aureus, & A. brasiliensis
  • Resistant to Hydrocarbons (Petrol, Diesel, ASTM oil, & LPG Gas)
  • Resistant to many other gases & liquids, for example, ADBLUE, & Antifreeze
  • Complies with DSEAR duct sealing regulations
  • WIMES compliant
  • 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 decribed in the APEA Blue ATEX
  • Complaint – contains no moving parts or any form of material that can create a spark
  • Flame Retardant – Tested to UL94
ColourAnthracite Grey
Skin Over Time10 mins
Curing3-4mm per day
Tack Free Time22 mins
Hardness35 to 38 Shore A
Flow3.33 million cPS at 380°C
Tensile Strength0.72 N/mm^2
Density+5 to 40°C
Temperature Resistance-35 to +120°C
Intumescence Activation Temperature210°C
Pressure Resistance2.0 Bar
Shelf Life12 months

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 01772 754177 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.

Using our patent pending tubular rubber tubes, various shapes can be made to help with cable separation, for example, trefoil/triplex 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 Grey Stuff. If you have running water, please contact JUTA for advice on 01772 754177.

Cure Time

Grey Stuff will cure 3-4mm daily, depending on the humidity and temperature. The higher the humidity%, and temperature, the quicker grey Stuff will cure. A minimum requirement of 20mm Grey Stuff 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. Nonhazardous Zero MEKO.

Re-entry & Removal

Grey Stuff will cure to a similar hardness of 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. JUTA accepts no responsibility for damaged cables.

Cable Suitability

Grey Stuff 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. 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.

BBA Logo
CE Mark
Site Investigation
Site Investigation
Site Investigation Reports Monitoring Results. We review these reports and advise routes for compliance.
System Design
System Design
Full Ground Gas Protection System Design available.
Wide library of standard details with site specific details on request.
All our installers are certified NVQ Level 2 qualified installation contractors.
We ensure your project complies with the relevant building regulations.

Ground Gas Standards

There are many different standards and guidance documents that detail how to understand the risk of ground contamination, and design solutions to mitigate these risks. The different documents relate to different ground contamination. Below are some of the key documents to be aware of and refer to:

BS 8485:2015+A1:2019 – Codes of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings.

  • Ground gases typically found near landfill sites but can occur from other sources
  • Encourages the use of qualified installers
  • Validation to Ciria C735 is a requirement
  • Additional influences on the system should be considered, such as the hydrostatic conditions, and the likelihood of the source contaminant being in direct contact with the protective measures proposed
GP<sup>®</sup> DUCTSEAL <sup>HG</sup> +GREY STUFF

BRE 211:2015 – Guidance on protective measures for new buildings. (RADON)

  • Naturally occurring ground gas. Larger concentrations in the South-West of UK
  • The minimum recommendation is a membrane of 300 micrometre (1200 gauge) polyethylene sheet or equivalent
  • It must be installed with considerable care and protected once installed
  • Taped laps are required
GP<sup>®</sup> DUCTSEAL <sup>HG</sup> +GREY STUFF

CIRIA C748:2014 – Guidance on the use of plastic membranes as VOC vapour barriers

CIRIA C682:2009 – VOC Handbook

  • Risk-based approach
  • No quantifiable limits on material performance
  • Testing to ISO 15105-2 and EN 14414/EN 14415
    9 main VOC types are tested for
  • Welded laps are required as most tapes are made from bitumen/butyl and are affected by VOCs
GP<sup>®</sup> DUCTSEAL <sup>HG</sup> +GREY STUFF

CIRIA C735:2014 – Good practice on testing and verification of protection systems to buildings from hazardous gases

  • Good practice on testing and verification of protection systems to buildings from hazardous gases
  • Check design and detailing is in accordance with site requirements
  • Checks the competency of the installer (NVQ LEVEL 2 minimum)
  • Test integrity of the membrane/barrier system
  • Visual inspection
  • A written report on inspection/testing and sign-off

BS8102:2009 – Code of practice for protection of below ground structures against water from the ground

GP<sup>®</sup> DUCTSEAL <sup>HG</sup> +GREY STUFF

JUTA Solutions & Applications

Our gas protection membranes suit a variety of applications and situations, with our TITAN® range offering not only gas protection but also having superior waterproofing and invasive weed control qualities.

BRE 211 NHBC (Amber 1) BS8485:2015 + A1 2019 / NHBC (Amber 2) C748 C748 BS8102:2009 RPS178 C753 BBA Agreement Certificate
Radon Bulk Ground Gasses Cardbon Dioxide and Methane VOC Vapour Permeation Hydrocarbons Immersions TYPE-A Bonded Waterproofing Invasive Weed Control SuDs Impermeable Membrane
GP®H 0.6mm

Get In Touch With The Experts

If you feel first class service, premium products direct from source, and bespoke solutions are right for you then don't hesitate to contact our team today on 01772 754177 or email us at [email protected]

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