Crushing or processing of nonmetallic minerals ( limestone, dolomite, phosphate, sand stone, feldspar, quartz, ilmenite, rutile, zircon, mica, graphite, kaolin, etc) excluding lime shell and granite crushing activities. 55. Granite boulders making or processing industries (extracting, blasting, slicing, polishing). 56.
Materials testing laboratory was accredited by Sri Lanka Accreditation Board (SLAB) to comply to the ISO 17025 for the mechanical testing on Concrete cube crushing in accordance with SLS 1144 and Tensile testing on reinforcement bars in accordance with (BS 4449 SLS 375) ISO 6892 SLS 978.