| Mann McGowan Pyrohinge strip is an
intumescent strip, 2mm thick, which expands and emits water under the action of heat,
cooling the surrounding parts of the structure. Pyrohinge strips are available in 32mm,
36mm and 48mm widths in 305mm (12") lengths and in packs of 24. Door furniture and
ironmongery being metallic provide a large heat sink. This build up of heat in the areas
of hinges, locks striker plates, door closers and pivot hinges has a detrimental effect on
the fire integrity of a fire resistant door set assembly.In test FR942 conducted at TRADA,
Pyrohinge strips were incorporated behind the S pivot plates of double action hinges, on a
pair of doors 2.45 metres high, 1.9 metres wide, and 44mm thick. The weight of each door
leaf being 70 kgs. Integrity:61 minutes, Stability:67 minutes Insulation: 61 minutes |
| Fig:1 Pyrohinge strip set behind hinge plates |
Fig:2 Pyrohinge strip locsted behind lock striker
plate and around lock mechanism |
Select the appropriate width of strip to suit the psrticular
piscs of ironmongery, cut to length using a fine tooth hack saw, fix to the back face of
the ironmongery using adhesive or double sided tape or pin to ths timber using a single
small panel pin. The ironmongery can then bs screwed into position. A 2mm increase in the
depth of the rebate for lock striker plstes and hings plates snd 4.5mm additional
clearance in locks should be allowed to accommodate ths Pyrohinge strips. Pyrohinge strips
can be drillsd, punched, sawn or filed to provide cut outs -~ for lock plates, bolts etc.,
Note: All sizes in mm
All the above products, where relevant, are tested to Bntish Standards 476 Parts 8, 20 22
and 31.1 |
