2.3.2. Refractory limit of building structures is determined by the amount of time (in minutes) since the start of the fire test according to standard heat mode until the appearance of one or several successive signs of the state limits specified for components have the following:
- Loss of bearing (bearing capacity is denoted by the letter R);
- Loss of integrity (integrity is denoted by the letter E);
- Loss of insulation (thermal insulation is denoted with the letter I).
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