There are three isomers of xylene: o-xylene, m-xylene, and p-xylene. The JIS standard includes the total content of o-, m-, and p-xylene as 80% or more, and benzene at 0.1% or less, Toluene is defined as 1.0% or less. The purity test of xylene was performed with reference to the calculation method for JIS relative sensitivity.