Abstract
In JG 149-2004 《External thermal insulation composite systems based on expanded polystyrene》 , the compressive and flexural strength rate means the flexility of mortar. A lot of people think that the polymer’s Tg value affects the rate largely . The value is lower, the rate is smaller, and the flexility is better1. But our experiment shows that the compressive and flexural strength rate and
Tg value have no relation in test Tg value（-7℃-9℃） range.
Key words: polymer, Tg value, compressive and flexural strength rate