BTU International, Inc. designs, manufactures, sells, and services thermal processing equipment and related process controls for use in the electronics, alternative energy, automotive, and other industries worldwide. The company’s electronics products include thermal processing systems used in the solder reflow and curing stages for surface mount applications in printed circuit board assembly; convection reflow systems; and wafer level and die level semiconductor packaging systems. Its alternative energy products comprise solar processing equipment for silicon and thin film photovoltaics; in-line diffusion systems; rapid thermal processing furnaces for the solar cell metallization process, as well as for contact drying and firing purposes; and walking beam and pusher systems for sintering nuclear fuel. It primarily serves multinational original equipment manufacturers and contract manufacturing companies. The company markets and sells its products through direct sales and independent sales representatives. BTU International, Inc. was founded in 1950 and is headquartered in North Billerica, Massachusetts. As of January 30, 2015, BTU International Inc. operates as a subsidiary of Amtech Systems Inc.