SPI HOPG GRADE 2
Very similar to ZYB(see below), this grade exhibits a mosaic angle as small as 0.8° +/- 0.2°. This grade is slightly less highly ordered than SPI-1 but is acceptable for most users. The lateral grain size can be up to 0.5 mm but can be as large as 1 mm. Note that this grade is slightly less "cleavable" than the 0.4° mosaic spread product, that is, SPI-1. Most workers find this grade more than suitable for all but the most critical samples, but priced low enough for routine use. Some users prefer this grade to SPI-1 because the cleavage steps are slightly wavy, so samples are held in place better (e.g. better adhesion).
What is Grade ZYBSuitable for most research applications when samples are to be mounted samples for analysis. It is also easily renewed and the user should be able to get fifteen to twenty cleavings per HOPG block. Mosaic spread is 0.8° +/- 0.2°.
