Thermo Nicolet 269-120200 Secondary Polystryrene Film for FTIR - 1.5mil

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. Typically 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 are mounted on 2” x 4” cards that fit in the standard universal slide mount in all spectrophotometers. The films have a matte finish that reduces the amplitude of interference fringes but also increases scattering. 

This Nicolet film is 1.5mil (38.1μ).