Envirograf Firoblok Intumescent Sleeves for Services

Availability: In Stock


Intumescent sleeves to protect services passing through fire-rated ceilings, floors and walls.



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. Also part of the range is a specialised sleeve designed for electrical conduits. End plates are also available to seal penetrations in walls or floors, allowing services to pass through.


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:

For pipes

Ref Internal diameter External diameter

IWS18 18mm 29mm

IWS25 25mm 31mm

IWS33 33mm 43mm

IWS40 40mm 50mm

IWS50 50mm 60mm

IWS55 55mm 63mm

IWS60 60mm 70mm

IWS83 83mm 93mm

IWS90 90mm 100mm

IWS100 100mm 110mm

IWS115 115mm 125mm

IWS127 127mm 137mm

IWS150 150mm 160mm

IWS165 165mm 176mm

IWS215 215mm 226mm

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


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