Special Features:

Material used in the manufacture of this optical part shall not containthorium, other radioactive materials, orany combination of nuclear materials in excess of .05 percent by weight as defined by title 10, code of federal regulations, part 40.The infrared antireflective coating is excluded from this restriction and contains thorium approximately .0011 grams per square centimeter of coated surface.Thorium in the antireflective coating should not exceed this amount

Properties:

An unmounted, transparent, color free lens which may be treated with a low reflection coating to increase light transmission. Includes single and compound elements. For items having two plane parallel surfaces, see window, optical instrument. Excludes reticle, optical instrument.