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عمران::
نفوذپذیری
Generally all materials per- form better at higher temperatures, though with certain ther- moplastics softening may lead to problems of sag, flow and indentation.
(iii) Indentation by spiked heels, etc
Important secondary benefits of a backup material are that it supports the sealant and helps resist indentation, sag and al- lows a sealant to take advantage of maximum extension.
lowing: intrusion of foreign material, wear, indentation, pickup by traffic, fire or attack by chemicals present.
In addition, the abrasion and indentation resistance of urethane sealants is above average.
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