Why is the difference between the 200 series and 400 series collars?
The Pyroplex range of fire stopping devicesnhave been identified by a series reference, with the 200 series suitable fornuse on a limited range of pipe diameters to achieve 120minutes fire resistance.nThe outer casings are manufactured from two distinct grades of steel, the 200 seriesnis manufactured from a Zintec coated galvanised steel, whereas the 400 seriesnis manufactured from a bright annealed 304 stainless steel.