calcium sulphate (when disposed of at a site that is authorised to accept non-hazardous waste only and when disposed of in a cell that does not contain any biodegradable waste), and
calsiwm sylffad (pan gaiff ei waredu ar safle sydd wedi'i awdurdodi i dderbyn gwastraff nad yw'n beryglus yn unig a phan gaiff ei waredu mewn cell nad yw'n cynnwys unrhyw wastraff bioddiraddadwy), a