Expansion - volume and force
Capacity for continued expansion (stable char)
FS3003 SOFT PUFF™
The FS3003 has been developed specifically for doors. This rubber matrix material begins intumescing at relatively low temperatures. It expands gradually to fill all gaps with moderate force that will not unlatch the door, and has sufficient reservoir capacity to continue intumescing if escape doors are closed again. FS3003 also stands up well to the stringent requirements for protecting fire doors on oil rigs, which are subject to especially intense heat and flames.
The FS4004 is a graphite-based material formulated to expand to approximately 80 times its original volume. This expansion rate works very well for filling lock-side top corner gaps typical of metal doors exposed to extreme heat. FS4004 is used extensively in our FBLS Fire Block Louvre System, and to line door aperture cut-outs. WF Report No 190621/A Issue 4 dated 17.09.2018 refers. All intumescent products are non-carcinogenic and asbestos-free. Unlike other products available in the marketplace that require special sheathing because of short shelf life, FS3003 is a very stable material. Intumescent products are rubber-like in texture and are easy to cut and glue, whereas other products tend to be brittle and more difficult to handle. And we offer our product in a variety of convenient standard sizes.
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