The weights of paper used for coated abrasive backings are designated by letters A, C, D and .

The weights of paper used for coated abrasive backings are designated by the letters A, C, D and E

Explanation:

The letter designation of the weights of paper backings for different applications are;

'A' Weight - Paper meant for use in finishes in abrasive projects. The paper is light (weight) touch grade of abrasive paper

'C' Weight - The 'C' designated paper is the medium light grade which offers more strength and bendability and it is suitable for woodwork by a cabinet maker

'D' Weight -  The 'D' weight category is a medium heavy paper

'E' Weight - The 'E' weight category is a strong paper category, used for discs, coarse sheets, and belts

Therefore, the letters A, C, D and E are used to designate the weights of paper used for coated abrasive backings.

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