Development process of a new anti-sapstain formulation and its present status with the relevant problems
K Nobashi, Y Nomura, K Tsunoda
An anti-sapstain formulation, which contains 2-(thiocyanomethylthio)benzothiazol (TCMTB) and methylene-bis-thiocyanate (MBT) as active ingredients, was developed by a technical agreement with Buckman Laboratories (Memphis, TN, USA) as an alternative to chlorinated phenols for the Japanese market. The formulation was commercialized as BAM 12 years ago. As anti-sapstain treatment is commonly conducted by momentary dipping at the Japanese sawmills and the treatment solution is repeatedly used, a high stability of the solution is required. Thus, a series of surfactants was screened to select the most suitable surfactant to meet the requirement. Laboratory evaluations showed that the newly developed product was effective against molds (Aspergillus, Penicillium and Rhizopus) and a sap-staining fungus Aureobasidium pullulans. When it was occasionally found ineffective against Gliocladium at lower treatment concentration, a chemical additive (IPBC or carbendazim) was shown to be helpful to fill up the deficiency of effectiveness. This was also demonstrated in the field trials. This report additionally refers to the problems that were experienced during and after commercialization of the anti-sapstain chemical formulation BAM.
Keywords: 2-(THIOCYANOMETHYLTHIO)BENZOTHIAZOL; METHYLENE-BIS-THIOCYANATE (MBT); ANTI-SAPSTAIN; ANTI-MOLD; LABORATORY EVALUATION; FIELD EVALUATION