Brick - one of the most popular building materials in our country. So when buying brick house to be sure it as, you need to know, What features should have this product in accordance with GOST and what defects are unacceptable.
Brick is classified by the following parameters:
- By strength stand marks M100, M125, M150, M175, M200, M250, M300 (the higher the number - the, respectively, higher strength);
- Frost resistance - F25, F35, F50, F75, F100. The number here is the number of freeze-thaw cycles, which can withstand the product.
- In terms of average density (kg / m³) defined thermal performance products. The average density can be 0,8; 1,0; 1,2; 1,4; 2,0. The smaller the index - the higher the efficiency (ie. lower thermal conductivity coefficient);
- Another important characteristic - the size. Normal product format, taken as a unit of measurement, equal 250h120h65 mm. Brick, having dimensions such, It referred to as the 1NF called single. If the product is in any other dimension has a size, it is marked as follows:: eg, Modular brick has the sizes 288h138h65 - as it turns out more in 1NF 1,3 fold, it is designated as 1,3NF.
of course, All these indicators are defined at the factory and the final consumer is difficult to check their own. But there is a list of unacceptable visual defects, that the buyer can check when buying:
- Repulsed deeper angles 15 mm;
- Ribs length longer than repelled 15 mm and a depth of more 3 mm (repulsed shtangenglubinometrom measured according to GOST 162 or a metal ruler according to GOST 427);
- cracks;
- More 5% "Polovnyaka" in the party (polovnyak - the split into two parts article or, having through cracks).
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