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7.12 Test methods for seals in the combustion products evacuation ducts, terminals and connecting ducts .1 Characterization
To characterise the material the following properties are determined:
– hardness in accordance with ISO 7619 on a minimum of 6 test pieces;
– density in accordance with ISO 2781 on a minimum of 6 test pieces;
– compression set in accordance with ISO 815 on a minimum of 3 test pieces;
– tensile strength in accordance with ISO 37 on a minimum of 6 test pieces;
– stress at 100 % of elongation in accordance with ISO 37 on a minimum of 6 test pieces.
7.12.2 Long-term resistance to thermal load
The test pieces are exposed for 56 days in air at the nominal working combustion products temperature.
The test is carried out in accordance with ISO 188.
After exposure it is checked that the requirements in 6.12.2 are met, where:
– hardness is determined in accordance with ISO 7619 on a minimum of 6 test pieces;
– tensile strength is determined in accordance with ISO 37 on a minimum of 6 test pieces;
– stress at 100 % of elongation is determined in accordance with ISO 37 on a minimum of 6 test pieces.
7.12.3 Long-term resistance to condensate exposure
The test pieces are exposed for 56 days in test condensate at 90 °C for K2 and at 60 °C for K1.
( The composition of the test condensate is given in Table A4-9.
Table A4-9 ⎯ Condensate composition, related to construction classes Chemical
component Concentration for mg/l K2
Concentration for mg/lK1
Chloride 30 30
Nitrate 200 50
Sulphate 50 50
The test is carried out in accordance with ISO 1817.
After exposure it is checked that the requirements in 6.12.3 are met, where:
– hardness is determined in accordance with ISO 7619 on a minimum of 6 test pieces, – tensile strength is determined in accordance with ISO 37 on a minimum of 6 test pieces, – volume is determined in accordance with ISO 1817 on a minimum of 6 test pieces,
– stress at 100 % of elongation is determined in accordance with ISO 37 on a minimum of 6 test pieces.
© BSI 2008
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7.12.4 Cyclic condensate resistance test This test comprises the following 24 h cycle:
At least 6 test pieces are mounted on a base plate in such a way that they have an elongation of 25 % and that one side of the test pieces is in contact with the base plate. Throughout the full test sequence the base plate is kept horizontal with the test pieces on top. The base plate shall consist of a material that is sufficiently resistant to the influence of condensate and shall have a maximum surface roughness of 5 àm.
Alternatively at least 3 flue pipe assemblies including one seal each may be used.
The test pieces mounted on the base plate are immersed in condensate for 6 h at 60 °C. Alternatively the flue pipe assemblies, filled with condensate in such a way that the level of the condensate is higher than all parts of the seal, are exposed for 6 h at 60 °C.
The composition of the test condensate shall be in accordance with Table A4-8.
After the exposure to condensate the test pieces mounted on the base plate are removed from the condensate.
The flue pipe assemblies are emptied of condensate. It is important not to dry the test pieces or the flue pipe assemblies before immediately transferring them to a ventilated oven.
The oven is operated for 0,5 h at a temperature of 60 °C and for 17,5 h at the nominal working temperature with a maximum of 110 °C.
The above cycle is repeated 12 times.
After exposure it is checked that the requirements in 6.12.4 are met.
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7.12.5 Relaxation behaviour
The test is carried out in accordance with ISO 6914.
The test pieces are exposed for 3 weeks in air, at nominal working combustion products temperature at 50 % elongation.
It is checked that the requirement of 6.12.5 is met.
7.12.6 Compression set
The test is carried out in accordance with ISO 815.
The test pieces are exposed for 24 h in air at nominal working combustion products temperature.
It is checked that the requirement of 6.12.6 is met.
7.12.7 Low temperature resistance
The test is carried out in accordance with ISO 815 on a minimum of 6 test pieces.
The test pieces are exposed for 72 h in air at a temperature of – 20 °C.
It is checked that the requirement of 6.12.7 is met.
7.12.8 Strength of joints in elastomeric seals
Three test pieces including the joint are 100 % elongated and exposed for 1 h in air at 23 °C and 50 % humidity.
After exposure it is checked that the requirements 6.12.8.1 and 6.12.8.2 are met.(
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