SJ has been in business for over 15 years and now represents a company in solving your heat treatment needs. Our success has been driven by our technology innovations, tooling capability, applications and design engineering expertise. We put enormous efforts for our clients’ convenience through safe and stable designs. About SJ HIGH TECH Established: 2001 Clients: Academic and Industrial Service: LED, Optoelectronic semiconductors, Graphene, Solar Industry, Research organization, Lab