S 1272 (OTTO) Samarium oxide, 99.95% Cas 12060-58-1 - used in optical and infrared absorbing glass to absorb infrared radiation. S 1272 (OTTO) Samarium oxide, 99.95% Cas 12060-58-1 - used as a catalyst for the dehydration of primary alcohols to aldehydes or ketones. It forms samarium perchlorate when treated with perchloric acid, which is used as a reference material for checking the wavelength scale of a spectrophotometer in the range of 200 to 500 nm.