Optimal cutting temperature (OCT) compound is used to embed tissue samples prior to frozen sectioning on a microtome-cryostat. This process is undertaken so as to mount slices (sections) of a sample onto slides for analysis.
Components From MSDS: 5–15% polyvinyl alcohol 1–10% polyethylene glycol 75–95% non-reactive ingredients
See also Microtome Cryostat
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Further reading