JIS C 60068-2-49:1993 (R2015)

Satisfactory performance during the desired lifetime of contacts and connections depends on many parameters, some of them determined by their design (type, materials, forces, etc.) and others by the environment in which they have to function. Concerning the effect of the environment, special attention shall be paid to the polluting substances contained -- usually in very small amounts -- in the atmosphere. JIS C 0090:1983 relates to on of the most important pollutants found especially in urban and industrial atmospheres, namely, sulphur dioxide. (SO2).