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BS EN 15741:2020 contains two approaches that can be followed

DMPP in fertilizers is a nitrogen inhibitor

Aerospace. Self-locking nuts with maximum operating temperature greater than 425 °C. Procurement specification Ingestion-build-159183 it defines symbols for a1 Scope This International Standard specifies the required characteristics for metric self locking nuts, with MJ thread, for use in aerospace construction at a maximum temperature greater than 425 C. It is applicable to nuts as defined above, provided that reference is made to this International Standard in the relevant definition document.