Do these filters (f92490vol) need to be furnace fired before use for volatile solids testing?

You do not need to put these through the volatile oven prior to using them. All filters with a part number ending in ‘VOL’ have already had that step preformed prior to the weighing step.

what is the difference between this product and the F92490MM. Have the VOL filters been dried at 550C?

You are correct, the part numbers ending in MM have gone through the washing, drying, weighing procedure as required to prepare the filters for suspended solids analysis. The part numbers ending in VOL have had the additional step of being ignited at 550°C in the process.

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