As per API 6A temperature classification, -20 deg F to 250 deg F operating temperature range.
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The maximum temperature in Class F insulation is 150* C.
schedule is the thickness of the pipe and class is pressure/temperature rating of a fitting or pipe
Class Y insulation can withstand a max temperature of 90 degrees centigrade. Examples are Cotton, Silk, Paper, Wood, Cellulose, etc.
black patent is the really shiny one, whereas the black pu is the dull, unshiny looking one
Pipe class is a collection of most compatible components considering dimensional and material properties for the intended service over a range on pressure and temperature specified.