... it is widely used to mediate middle and high Technical Indices of T122:Quality features of T122 and test method. ItemsIndicesTest methodsFlash ... /T 265Density, 20 °C, kg/m31020~1180GB/T 2540Total base number, mg KOH/g≤ 240SH/T 0251Calcium content,m%≤8.90GB ... corrosion of copper, lead. It can be used for blending high-grade engine oils. (oil additive)High based number sulfurized calcium alkyl phenolate