Designation BS EN 12513:2011 EN GJN HV350 (former BS 1B). Record based on BS 4844:1986 BS grade 1B. Tradenames: CPERLIT (PERLITGUSS) Standards with similar compositions: China: Normal chill spheroidal graphite to GB/T 1504 India: Grade 2 to IS 7925 UK: 1B to BS 4844 Typical uses Abrasion resistant components.