Testing                                                                                                                                                              ASH

ASH

General 

Though all fibrous materials used for the manufacture of paper and allied products have an inherent ash, it is generally small. The percentage of ash is, therefore, taken to be an index of added mineral matter or loading. A known weight of the specimen is burnt, ash weighed and the percentage calculated.

Calculation

Calculate the ash as percentage on the original weight of the material as follows:

w - x

Ash, percent by weight = 100 ———

W-x

where

w = weight in g of the crucible and the ash,

x = weight in g of the crucible, and

W = weight in g of the crucible and the material.

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