Your search resulted in 4 documents.
Results from soft rot tests in vermiculite jars
1976 - IRG/WP 272
T Vihavainen
Treatment of wood with formaldehyde. Acid catalysis of the reaction between formaldehyde and wood
1980 - IRG/WP 3146
Formaldehyde reacts with the free OH-groups in wood forming cross-linking bonds. The reaction can be brought about without any catalyst but in that case the activation energy is very high and high temperatures and long reaction times are needed. Normally, the reaction is catalysed by different acids. Acid catalysts, however, tend to degrade the cellulose and the wood matrix causing reduction in th...
T Vihavainen, K Piispanen, P Mansikkamäki
Methods of testing anti-stain chemicals for protecting sawn timber during storage and transport
1976 - IRG/WP 273
No international standard method for testing anti-stain chemicals for protecting fresh sawn timber exists. The methods used can be divided into three types: a) Rapid screening tests for finding chemicals effective against blue-stain and mould fungi. The chemicals are tested in agar medium, in pieces of filter paper or on small pieces of wood using pure cultures. b) Laboratory tests for evaluating ...
T Vihavainen
Regulations of wood preservatives in Finland
1978 - IRG/WP 3124
Toxic wood preservatives are covered by the Poison Act (No. 309/69). The act came into force in May 1969 and was supplemented by the Statute on Poisons (No. 612/69). The act and the statute contain the regulations on the production, commerce and handling of poisons. Already when issued they were complained to contain some defects and obscurities. However, only minor alteration in them have been ma...
T Vihavainen