Quelfire QF4 Fire Protection Compound is a premixed inorganic powder consisting of lightweight aggregates, inorganic binders and gypsum cement supplied in 25kg bags. It is mixed with water on site to produce a fire protection compound that is used around services through fire compartment floors and walls.
Physical Properties / Handling
Surfaces must be firm and free from adhesion-reducing substances and dust. Absorbent surfaces are to be pre-wetted with water.
Gross density (wet mortar): 2.000 ± 100 kg/m³
Gross density (dry mortar): 1.75 – 1.85 kg/dm³
Pressure resistance: ≥ 20 N/mm² (M 20)
Consumption: 4.0—4.5 water + 25 kg dry mortar, ≈ 15 l ready-to-use wet mortar, ≈ 15 l volumes after curing time
Application temperature: > +5 °C
Application time app: 2 – 3 hours
Fully cured time: app. 28 days
One square metre at 160mm thickness requires approx. 13 x 25kg sacks of QF4 Fire Protection Compound.
Packaging & Storage
Supplied in 25kg bags which must be stored in cool and dry conditions. Shelf life is approximately 12 months.
View NBS Specification
Quelfire QF4 Fire Protection Compound is one of 2 Quelfire compounds currently approved for use on the London Underground network – the other product being QF1.
QF4 is regarded as a harder compound and is generally used around mechanical services – sometimes with the QF1 within the same seal around electrical services.
Quelfire have limited test evidence for the product so technical support for this product is very limited and the QF4 is regarded as a product rather than a system. Instead the product tends to be tested directly by London Underground and their approved contractors, often without Quelfire knowledge so we recommend that you consult London Underground to establish how the product should be used.
QF4 is supplied in 25kg bags and should be mixed in a clean container or mixer with approximately 4 litres of clean water per bag by slowly adding the dry powder to the water while stirring by hand or power mixer to ensure a smooth lump-free mix.
The opening should be clean and dust free and can be pre-wetted. A temporary (or permanent shutter) should be considered and fitted then the QF4 can be poured or trowelled into position to the correct depth and smoothed off ensuring all gaps and voids are fully filled in accordance with the approved detail.
Any excess residue should be cleaned from services and surfaces and once cured, any temporary shutters can be removed.