AAC BLOCKS MANUFACTURING Opus Industries Pvt. Ltd., manufactures and markets Autoclaved Aerated Concrete (AAC) building material under the Aerobuild brand. Opus is a product of teamwork and collaboration, which ensures constant innovation and development of new techniques that benefit its clients. Opus is successful in practicing the lean manufacturing concept in every process by virtue of sensitizing every team member to the benefits of reducing waste materials and time, and thus being relevant to clients as a value provider and a cost-saver.