Use of non pharma grade material

Hi my query is regarding use of non pharma grade material. If I am unable to get a pharmacopoeial grade material or any supplier is not available is it allowed to use AR grade material? Will it be accepted?

Could you clarify if this is as an API or as an excipient?

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What are the test or criteria between the 2 grades? We need more information.

This query is regarding the excipients. Testing will be done as per the pharma monograph specs however supplier will not label or claim it as BP or EP or USP

The supplier may be reticent due to legal risks. You can test the excipient into USP/EP specifications but you also have to be sure that it is handled in a cGMP fashion downstream (your QMS), otherwise it will be disqualified (and you would have wasted both time and money).