[mihailovoh]

Amateur,
 Fiberboard ( MDF -construction ) before the war was used in the construction of the heat- shumoizolyator.no was low protnosti those. loose and 8-18 mm thick ..
Familiar to us -tight has been in production gody.seychas 50s fashion is back in a loose canvas low plotnosti.Rech of CCCR and Russia
 As an example, on the loose otecheschtvennom hardboard work M Obolensky (the origin of the meeting Malyutin T )