Envirograf Firoblok Intumescent Sleeves for Services

Availability: In Stock


Envirograf’s Intumescent Firoblok sleeves are designed to protect services passing through fire-rated ceilings, floors and walls.

Read on for more information.


Firoblok Intumescent Sleeves by Envirograf

Firoblok sleeves are made of a fibre free intumescent material. Ideal for protecting cables, metal and plastic pipes, trunking and ventilation ducting where they pass through fire-rated block, brick, concrete or plasterboard.

We also have specialised sleeves for electrical conduits.

If necessary, we can supply end plates which allow services to pass through walls and floors whilst sealing them off. Please contact us if this is the case.

Fire testing:

Fire tested to European standards: EN1366-3 (2005), EN1363-1 (2000), and EN13501-2 (2004)

Tested to BS476 Part 22 (1987), achieving an integrity of 130 minutes in solid walls, 67 minutes in hollow walls, and 4 hours in concrete/block ceilings and walls.

They also have been designed to be in accordance with Document B of UK Building Regulations.

Advantages of Envirograf’s Intumescent Sleeves:

These fire sleeves slow down fire spread, absorb heat and resist water.

They are very flexible, making them easy to fit.

This product eliminates any corrosion problems caused by copper pipes coming into contact with concrete.

They have acoustic properties

They allow hot pipes to expand and contract, whilst giving them up to 4 hours protection

These fire sleeves have simple installation – see instructions below and data sheet above.

Once installed, they will last a lifetime without any degradation or deterioration.

Application Instructions:

On the substrate, mark an outline for where the fire sleeve is being installed.

Proceed to cut the hole. We recommend using a powered hole cutter or a padsaw.

Clean down the edges.

Attach the fire sleeve over the vent and to the service passing through.

Ensure that the assembly is flush with the substrate.

Order References (for pipes):

Ref                 Internal diameter External diameter
IWS18 18mm 22mm
IWS25 25mm 32mm
IWS33 33mm 43mm
IWS40 40mm 53mm
IWS50 50mm 62mm
IWS55 55mm 65mm
IWS60 60mm 70mm
IWS83 83mm 97mm
IWS90 90mm 102mm
IWS100 100mm 116mm
IWS115 115mm 135mm
IWS127 127mm 147mm
IWS150 150mm 173mm
IWS165 165mm 187mm
IWS215 215mm 240mm

Available in 100mm, 150mm, 200mm and 500mm lengths.


For technical advice on this product, please call us on 01752 690997.


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Data Sheets


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