1.1 This specification covers a grade of benzene known as refined benzene-535.1.2 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated value This specification covers a grade of benzene known as refined benzene-535. Different tests shall be performed in order to determine the following properties of refined benzene-535: minimum purity, maximum toluene content, maximum sulfur content, maximu