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SPI Supplies HOPG
SPI Supplies HOPG

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SPI Supplies HOPG

SPI Supplies offers its own "brand" of HOPG. It comes in three different grades as well as several standard sizes.

Grade SPI-1 is very similar to Grade ZYA described below and is comparable to the very best "calibration grade" HOPG. Grade SPI-2 is very similar to ZYB, is slightly less highly ordered than SPI-1 but is acceptable for most users. Grade SPI-3 may not be acceptable for the most demanding of experiments but for student use its much more economical pricing makes it ideal.

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