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Intumescent fire sleeve for flue pipes

Product 110


Intumescent fire protection sleeves for pipes and flue pipes. Made to Order.

Not available to purchase online.

We need to ask you a few more questions and ensure this is the suitable product for your needs.

To order please call us on +44 (0) 1 304 842 555


Fire Sleeve for Flue Pipes

Intumescent fire sleeve for flue pipes. Ideal for pipes and also flue pipes that pass through fire-rated block, brick, concrete or plasterboard. In the case of a fire, the intumescent material will expand, thus sealing the gap and preventing fire spread. Specialised sleeves designed for electrical conduits are also available in this range.

  • Made of a fibre-free intumescent material which allows for the natural expansion and contraction of pipes and also gives protection from corrosion caused by contact with cement and other materials.
  •  They also absorb heat to help prevent services, pipes, and cables from overheating.
  • Highly flexible, moisture resistant, and feature acoustic properties.

Specially designed passive fire range to meet Document B of Building Regulations, and also tested to European Standards. Explore our further range of Firoblok Sleeves and Ducting Protection online now.

Envirograf ® passive fire products carry the hallmark of excellence, reflecting the high standards that prevail in its laboratory, test rig, and manufacturing plant. Envirograf® passive fire products are subject to rigorous quality control which, at all stages, ensures products remain at the leading edge of fire containment technology. This quality has earned the company and its passive fire products a high reputation. With its operating system accredited to ISO9001.


– No more corrosion problems due to copper pipes having contact with concrete surfaces

– Meets all regulations

– Allows for expansion and contraction of hot pipes and gives up to four hours protection

– Easy to cut; no more sawing and de-burring steel pipes

– Can be cut with a knife and off-cuts can be taped together, leaving no waste

– Will last a lifetime in-situ and will not degrade or deteriorate

Application Instructions

Mark the outline for the Firoblok sleeve on the substrate.
Cut out the hole with a powered hole cutter or padsaw and clean down edges.
Fit the Firoblok sleeve over the vent and fit to the ducting or service passing through.
Push the assembly back into the substrate until flush.


Order References / Sizes

Fire & Thermal Protection Sleeves

For pipes

Ref                  Profile             Length

IWS 18T         18mm              500m

IWS 25T         25mm              500m

IWS 33T         33mm              500m

IWS 40T         40mm              500m

IWS 50T         50mm              500m

IWS 55T         55mm              500m

IWS 60T         60mm              500m

IWS 83T         83mm              500m

IWS 90T         90mm              500m

IWS 100T       100mm            500m

IWS 115T       115mm            500m

IWS 125T       125mm            500m

IWS 150T       150mm            500m

IWS 165T       165mm            500m

IWS 215T       215mm            500m


For flue pipes

Ref                              Internal Diameter                 Length

110FLUE-A               165mm                                    150mm

110FLUE-B               205mm                                    150mm

110FLUE-C               205mm                                    200mm

110FLUE-D               305mm                                    150mm