EN 1857:2010 – Chimneys – Components – Concrete flue liners
8.5 Compressive strength
8.5.1 The manufacturer shall declare the structural height. When tested in accordance with A.8, flue liners and straight fittings shall withstand an intensity of loading equivalent to four times the manufacturer’s declared structural height.
NOTE The manufacturer’s declared structural height may be derived from the ultimate compressive strength determined by the method in A.11.
8.5.2 Flue liner bends or other fittings made of the same material mix and by the same method of manufacture as the tested straight flue liner shall be deemed to conform to the requirement in 8.5.1.
8.5.3 Flue liner bends or fittings made of a different material mix or using a different method of manufacture from those described in 8.5.2, shall be checked for compressive strength by testing a special straight test sample in accordance with 8.5.1. This special straight test sample shall be made using the same material mix and manufacturing method as the bend or fitting.
8.6 Corrosion resistance When flue liners designated condensate resistance class W (suitable for use in wet operating conditions) are tested as described in A.9, the weight loss of the pieces shall not be greater than 0,1 %. Flue liners designated condensate resistance class D (dry) and which conform from 8.1 to 8.4 may be assigned corrosion resistance class 3.
8.7 Condensate resistance When flue liners designated W (for use in wet operating conditions) are tested as described in A.9 the maximum mass of test solution passing through the wall of the flue liner during any 24 1 0 + h test period shall not be greater than 0,5 g/h·m 2 of the flue liner external surface.
8.8 Bulk density When flue liners are tested as described in A.10 each bulk density value shall be within a limit deviation of ± 10 % of the manufacturer’s declared bulk density for the flue liner.
8.9 Thermal resistance Thermal resistance shall be measured in accordance with the method given in A.5 or calculated in accordance with the method given in Annex C and its value declared by the manufacturer.
8.10 Freeze/thaw resistance Where national regulations require freeze/thaw resistance of flue liners, they shall be tested in accordance with EN 14297. The product shall not present any damage of type 7, 8, 9 and 10 in accordance with EN 14297:2004, Table 1.
EN 1857:2010 – Chimneys – Components – Concrete flue liners