The sanitary sealant is usually used for the bathroom,kitchen like places.As the places are humid,there could be microbial effects higher than other places.Currently the method for the construction sealant is tested by the method ISO 846,but it was not only the method for sealant,it is also for plastic materials.The characteristic of the sealant and the plastic materials are somewhat different,thus it needs to develop the unique method for sealant use only.