Below is a list of Sinter manufacturers from LONDONDERRY, New Hampshire. Sinter process, more commonly called sintering, is a manufacturing technique utilized in a variety of industries to produce solid parts out of powdered materials that are heated to just below the melting point in order to cause particulate adhesion. The ability to create unique material composites that still retain most, if not all of their original properties can be credited with the popularity of this particular heat treating process.