• Envirograf Firoblock Sleeve

Envirograf Firoblock Sleeve

Product 33

Unfortunately, we no longer stock this product; please contact our technical team on 0113 2455450 (option 2) or send a message to [email protected] where we will be happy to offer you up to 10% off a suitable alternative product for your project.




Ref Fan/Vent Outside Diameter Cut Hole Diameter approx
EC80 80mm 95mm
EC100 100mm 118mm
EC125 125mm 140mm
EC150 150mm 170mm

Envirograf Firoblock Sleeves expand during fire, sealing the space between a pipe and the surrounding substrate. The sleeve acts as an insulator on metal pipes such as cast and steel, cooling pipes in a fire to prevent the spread of heat through a fire barrier, with up to 4 hours fire protection. It allows the expansion and contraction of pipes and protects them, especially copper pipes, from corrosion caused by contact with concrete.

For PVC pipes, conduit, trunking and cable trays, Firoblock sleeves expand and crush around cables to prevent the spread of fire and smoke through a building. Tested for use in Nuclear Power Stations, Firoblock should crush PVC pipes with wall thicknesses of up to 25mm.

Easy to cut with a knife, Firoblock sleeves are fibre-free. Offcuts can be taped together to minimise wastage, and will stay in situ in application until activated by a fire reaching 130ºc approximately 1-2 minutes into a fire. The Intumescent wall sleeves will last a lifetime in situ and will not degrade or deteriorate.


For block/plasterboard wall, please see the Product Data Sheet and Application Guide in our attachments section above.


  • 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 hacksawing and de-burring steel pipes.
  • Envirograf Sleeves can be cut with a knife, and off cuts can be taped together leaving no waste.


  • Used for pipes passing through fire rated walls and ceilings that must be allowed to expand and contract.
  • The intumescent will stay in situ in the application until activated by a fire reaching 130ºc approximately 1-2 minutes into a fire.
  • The Intumescent wall sleeves will last a lifetime in situ and will not degrade or deteriorate.
  • For every 1mm of intumescent when activated in a fire will expand to approximately 25mm (e.g. 2mm intumescent = 50mm expansion)

See also:

Material Specification:

The Intumescent wall sleeves are made from foil clad Intumescent material.

Multigraf Intumescent material chemical constitution

  • Mineral Wool Fibre 20-70% by weight
  • Exfoliating Graphite 20-60% by weight
  • Organic Binder (including adhesive coating) 5.0-30% by weight

Test Details:

Integrity Insulation
Chiltern - RF97062A 67 Minutes N/A (Hollow Wall)
Trada - TFEIF 94006 130 Minutes N/A (Solid Wall)

IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and ConditionsWe will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.

Any Envirograf products to be used in or for Harrods department store should be authorised with our Technical Team prior to purchase.

Product Details
Product 33

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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