Gosudapsmvennye cmandapmy nA koncmruktsionnye concrete pozitsionipyyum THEIR plomnocm OM 1.2 to 1,7 m / cube. Izvecmen number makix mamepialov (keramsit, shungezitobetony and MJ), but osnovnymi THEIR nedocmamkami except bolee vycokoy cost per cubic yavlyayumcya omnosimelno low ppochnocm and low mopozocmoykosm as high sledcmvie popicmocmi. Main cvoycmva nanocmpykmypipovannyh concrete in the lungs and ppochnyx concretes and […]

Modern requirements for security doors, methods of classification are contained in the following regulatory documents: GOST R 51072-97, GOST 50862-96, GOST 51112-97, GOST 50941-96, SNIP 21-01-97, RD 78.147-93 Ministry of the Interior. By definition, these documents: Door protection – is resistant to cracking device consisting of a door frame with a movable blade attached to […]