THE ANALYSIS OF ADMISSIBLE LEVEL OF FORMALDEHYDE IN AIR

Abstract

By production of glued and plate wood-base materials with use of carboamidoformaldehyde pitches (KFS) the main lack of technology of which is toxicity of these materials to the person. Toxicity is caused by allocation from these materials of gas, harmful to the person, - formaldehyde which is cancerogenic substance. Wood-shaving plates from needle (DSTP) and large-size shaving (OSB), fiber boards (DVP) including the Intermediate-density fiberboard (MDF), and also plywood of general purpose and different types of special plywood (decorative, bakelized, etc.), first of all, belong to such materials. The Russian Ministry of Health has established very strict requirements on release of formaldehyde in air both in premises, and in free air the admissible level of which makes (DU) only 0,01 mg/m3 of air when testing materials by chamber method. The plate materials released now can exceed DU of 17 times stated above. Especially it concerns DSTP. Despite attempts of institute Vniidrev through appeals to relevant authorities of the Ministry of Health to increase such admissible level in our country, generally for plate materials, were not crowned with success yet and this level in real time remains in force. It is possible to use such plates in premises only at very small saturation them room void volume (the saturation is defined as the relation of surface area of plates indoors to room void volume). So, by our researches for example it is proved that the written dvukhtumbovy table made of DSTP of class of release of formaldehyde E2 can be established in living room of 20 sq.m only one and no more. Only in this case, at small saturation room void volume plates, the release of formaldehyde in air of the room will meet requirements of domestic DU. In premises the case furniture is in reality with much bigger saturation that leads to room gas contamination formaldehyde. In too time abroad formaldehyde size DU in air much more also makes 0,124 mg/m3 of air. In this regard the purpose of our work consisted in the analysis of DU of formaldehyde in air of foreign researches.