KNOW YOUR FOAMS What the “B” Foam Classifications signify for the end user


Over recent years there has been some confusion over the German DIN4102 standard for foams and adhesives being marketed in the UK as B1, B2 and B3. These categories classify the contribution that the foam can make to a fire so that specifiers, architects and local authorities can request the use of particular products in a variety of circumstances. But what do they actually mean?


B1


The B1 rating simply means that the material referred to is difficult to ignite. Using the example of a fictitious block of flats in development, where a defined fire break is required between sections of the building (say gaps in blockwork or structural elements between two flats) you would use B1 rated PU foam. This is to ensure that there is sufficient time to evacuate the building in the event of a fire, before the flames can spread from one section to the other.


B2 The B2 rating indicates that the material referred to will contribute to the progress of a fire in a manner similar to an


item of wooden furniture. Using the same block of flats example, provided the perimeter of an individual flat has been secured with B1 foam, the filling of gaps between the individual rooms within the flat can be adequately achieved with B2 rated PU foam. Should a fire ignite, the B2 filling would burn at a similar rate to the doors or furniture within the flat.


B3 A B3 rated foam is defined as being easy to ignite. In our example, B3 foam would be used to fill and seal around


waste pipes in brickwork or gaps around window frames. In the scenario we have used, any fire in the building will be established before it comes into contact with any B3 material and so the effect on the progress and outcome of the fire will be negligible.


MEGA FOAM 3600


Application PU Foam


A high performance, polyurethane expanding foam ideal for gun or aerosol use with patented adapter valve.


Application: quick and easy to apply when fitting doors and windows or when insulating pipes or filling gaps. Mega Foam will improve draught and heat insulation and deaden noise. It is fitted with a unique valve which enables multi-directional use, so the can performs perfectly throughout 3600


of


rotation and, because the valve needs less propellant, the can yields up to 30% more volume than standard foams.


For internal and external use. Mega Foam can be used at temperatures between +50


C and +250 C to +1000 C. Class B3. Gloves supplied. Code


BDEF500 BDEF750


Colour Beige


Beige Size Box Barcode


500ml 12 750ml 12


5060021360731 5060021360748


Code


BDEFR750 BDEFRG750


C and when


cured will resist extremes of temperature from -400


B1 FOAM Fire Resistant PU Foam


High performance, fire rated foam tested to EN1366-4 and EN13501-2 standards.


Application: suitable for window setting where a clean and controlled backfill is required. Also entrance door linings and any kind of breakthrough in walls and cavities. Our B1 Foam has excellent noise and heat insulation values and exceeds the requirements of Construction Materials Class B1 rating in accordance with DIN 4102 pt1.


For internal and external use, B1 Foam can be used at temperatures between +50


C and +300 C to +1000


resist extremes of temperature from -400


C and when cured will C. Available as aerosol


(BDEFR) or gun grade (BDEFRG): use with BDAG1/M, BDAK45 or BDEFA foam guns, see page 26.


Gloves supplied.


Colour Pink


Pink Size Box Barcode


750ml 12 750ml 12


5060021360236 5060021363756


Please note: Polyurethane foams are moisture curing and therefore moisture must be present to ensure a rapid and even cure. Surfaces and foam can be lightly moistened using a water mister/spray to accelerate the curing process and save time.


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PU FOAMS AND ADHESIVES


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