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What is Eldfast?
A Modern Material
ELDFAST is a wholly ceramic material composed of two elements: a refractory ceramic aggregate in powder form and a resin bonding agent that together create a "slurry" with adhesive properties when applied under pressure.
Traditionally, only materials containing water, lime / clay mortar or cement have been available to re - parge a flue internally, these materials are now known to be prone to acid attack and deterioration.
Characteristics / Benefits:
1. Preserves X - Sectional Area
Eldfast is an in - situ applied lining, drawn through the flue by means of a "plug", leaving a 4 mm nominal thickness of material on the flue face (see method of installation for further details)
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As demonstrated above, Eldfast will follow the contours of the flue (although some rounding of corners is likely), rather than drastically reduce the free area, this is of particular benefit when wishing to retain future usefulness of the fireplace for open fires (requiring a minimum 8 inch / 200mm cross sectional area) or when dealing with smaller flue areas initially.
2. Minimal Disturbance to Decor
Eldfast is designed to be installed without the need to break into the flue externally, this is due to the "plug drawn" method of installation (see above). Many other in - situ systems specifically require brickwork to be removed at regular intervals to centralise " formers" and enable lining around bends in the flue.
3. Increases Updraught
Due to the ceramic nature of the Eldfast, your chimney will gain certain advantageous properties following lining with the material:
As the refactory aggregate does not easily let heat permeate though, it acts as an insulator, keeping the temperature of the gasses passing through at a higher level and therefore reducing the likelihood of condensates within (try to imaginespace shuttle tiles inside your chimney!!). This may also have some useful applications for thatch property owners, where the temperature at the point of intersection for flue and thatch can be considerably lowered from that achieved through only the brickwork.
Also as the material fills over jointing and missing parging within the flue providing a gastight surface, this surface will then dramaticaly improve updraught as a consequence of its smoother gas passage.
4. Temperature Impervious
Again, a benifit derives from the ceramic nature of the material (and one that is particularly relevent to solid fuel users). The results achieved under practical test conditions demomstrated that the product showed no signs od deterioration at temperatures approaching 2000 degrees centigrade - indeed, it would vitrify and effectively become stronger / harder. Put into context, a chimney fire may generate 1100 degrees centigrade, your flue lining is guaranteed to withstand it.
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