To request the proprietary encrypted file please enter your Filmetrics® system information
For a typical sample of APEXE the refractive index and extinction coefficient at 632.8 nm are 1.536 and 0. Below are files of complete refractive index and extinction coefficients. If the file is not available for download, you can request our proprietary file by clicking "Request".
Refractive Index Reference - Based on Cauchy Coefficients (no k values)
No guarantee of accuracy - use at your own risk.
Proprietary encrypted file for use with Filmetrics Systems: