Perniagaan Usahasama Membalak Sdn. Bhd. produces silica sand for customers in Peninsular Malaysia and Singapore. Its operations cover manufacturing, mining, engineering, construction services, cullet processing, and material supply to glass industries. It offers silica sand for optical glass/silica powder, table ware/TV tubes/sodium silicate, colourless container glass, clear flat glass, coloured container glass, insulating fiberglass/ceramic ware, and golf and turfing sand applications. The company also engages in cullet processing, and engineering and construction businesses. In addition, it offers service industries/logistic, which include international freight forwarding