Pair of polystyrene calibration films of different thickness cast on KBr, radial symmetry certification, summary of NIST standard 1921 with frequency locations, certification of traceability to NIST 1921b frequencies, instructions for two (2) film ordinate calibration, slide mount holder. Kit also includes a pair of standard polystyrene films, without NIST traceability certification, mounted on 2' x 4' cardstock which enables mounting in the standard universal slide mount found in all spectrophotometers. Storage case provided.
Superior calibrations are performed with radially symmetric films which eliminate the orientation effects of extruded films used for NIST Standard 1921 calibrations. This makes the films consistent from film to film. Sold in pairs of two (2) different film thickness, the differential between the absorbance intensities created by the two (2) film thickness becomes the baseline, thereby making the pair of films suitable both as an ordinate calibration standard useful for detection of degradation in instrument performance and for calibrating the abscissa scale in accordance with NIST Standard 1921.
Films cast on KBr windows will not exhibit any interference fringes. KBr windows with film are sold with a mount with a 2' x 4' backplate that fits the standard universal slide mount in all spectrophotometers.
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