Sine Associates, formed in 1994, is an engineering design and development consultancy. Hetpan and Sine Associates have combined to provide customized solutions. Sine Associates' area of expertise is centered on manufacturing plant and equipment related to foundry industry. Sine has been the pioneer in introducing the rotary degassing process in the UK.

Since then Sine Associates has focused on rotary degassing units and improvements in design to make the process easier to use in the foundry environment. Sine Associates also manufactures a range of melt testing equipments apart from rotary degassing machines.