This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Polymers reference materials . NIST polymer reference materials variety of polyethelene materials are shown are used in the calibration and performance evaluation of instruments used in polymer research and manufacturing Credit NIST Disclaimer Any mention of commercial products within NIST web pages is for information only it does