The Baader Solar Film - 250 mm x 250 mm - Visual Use from Astrozap: Baader Planetarium's AstroSolar safety film from Astrozap size 250 mm x 250 mm (9.84-inches/square) is a specially manufactured streak- and blister-free foil. It attains the optical performance of plane-parallel glass filters. The base material is not Mylar! The basic development of this film was made in laboratories for nuclear- and particle physics.
High density coatings on both sides of the Astrozap Baader Solar Film ensures a highly uniform filtering, while neutralizing the occasional microscopic holes in the coating. The image of the sun is extremely contrasty and of almost neutral color. The coating of the foil is subject to constant quality control. Its reflective property of over 99.999-percent has been tested by a German Republic bureau of standards and conformity with EU norm 89/686 is certified with the CE-symbol.
With this film, you definitely want to "Measure twice, cut once"!
OPT Product Number: AZ-1030