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Material corrosion

ASSUMPTION: If any changes in the dimensions and/or surface are observed then the product (ethanol solution) is corrosive to tested material. 

3 pieces of each material were suspended in sealable bottle. The bottles were filled with 10, 20, 30, 40 and 50 V% ethanol-deionized water solution. The tested material was outlined on a previously prepared paper sheet and a 3d photo of the fresh piece (3d microscope) was taken. The test run for 21 d. The bottles were opened and the materials were inspected every 2 to 3 days. Any changes observed were recorded (pictures with 3d microscope/measurements on previously used paper sheet) and noted in the dedicated table/file.