If you add a chemical from the master chemical list and the NFPA codes do not match your safety data sheet (SDS), you will need to request your chemical be added to the master chemical list. Click on the "Request Chemical not found in lookup" link, browse to your SDS, and click open. Your SDS should now be attached to your request. In the "Notes" box, identify the chemical and indicate that the NFPA codes are different than what is in the master chemical list. Then select Save.