What is OSB-boards and how they are harmful?

A relatively new building material - or OSB oriented strand board - became gradually replacing conventional building material plywood(And in fact plywood was invented in the 19th century!). At the same time environmentally friendly OSB times lower than that of plywood, and then in the process of production of OSB.

As produced OSB?
OSB boards are manufactured by hot pressing of layers of wood chips and shavings different fractions (90-95%) with harmful resins and adhesive components (5-10% plate composition). Typically within a single OSB-boards is from 3 to 5 layers ot hardened shavings and chips.

The most harmful components SIR - carbamide-formaldehyde resins, which serve to bond the layers. However, not all species are equally harmful CAP:

CAP-1.
Such panels can not be used for finishing the building, because can not withstand the vertical loads. This type of OSB is commonly used for the manufacture of containers and packaging, sometimes - furniture(!). Upon contact with water SIR-1 allocates formaldehydes, are therefore considered less environmentally friendly.

CAP-2.
Unlike-SIR SIR 1 this kind can absorb the load, but it also nevodostoek as OSP-1 is therefore used in dry conditions: the rough flooring of floors and cladding scaffolds.

Formaldehyde - a toxic substance that is recognized with a mutagen (it causes mutations) and carcinogenic (causing cancer). It is in this status formaldehyde is specified in SanPiN 1.2.2353-08.

OSB-3.
Moisture-resistant OSB type used for covering the frame from the outside, work on the roof, in the manufacture of partitions. Because the OSP-3 does not take the moisture, it generates less harmful substances than the previous two species.

OSP-4.
The rarest type of waterproof OSB plates, capable of withstanding severe loading. The least harmful type of OSB.

The greatest amount of formaldehyde resins and the SIR is isolated in the first year of operation of the building, so if you still choose OSB, often ventilate the roomAnd in the summer try to spend more time away from home.