This paper describes the effect of an ultra violet radiation, heat and condensation artificial ageing procedure on the ability of a range of building sealants to survive a movement accommodation test based on the ISO 9047 test method. Sealants stored under standard laboratory conditions were also subjected to the movement accommodation test.
It is shown that sealants which initially pass the movement accommodation test will continue to pass after up to 24 weeks of exposure to the artificial weathering, or storage in standard conditions. Sealants that initially do not survive the movement test can improve their performance after exposure to artificial weathering or storage in standard conditions.
Tensile tests were carried out on sealants that survived the movement test and on static control specimens. It has been found that the movement test, and to a lesser extent the artificial weathering, can reduce the width of the test samples. It has also been found that the movement test can decrease the force produced by most one part sealants when extended to a width of 15mm, nominally 25% strain.
No relationship between changes in sample width or force at 15mm width and the ability to survive the movement test has been found.