Interpane, the German glass processor based in Lauenfoerde, introduced a coated yet colour-neutral insulating glass as early as 1982. The recently introduced iplus S provides an improved solar gain (g = 64%) and a higher degree of light transmission (81%), as well as excellent thermal insulation (U = 1.2) while remaining neutral in colour. iplus neutral S is base product for an extensive range of thermal insulation products.