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L-arginine is a solid up to temperatures of at least ca. 223 °C and decomposes at ca. 240°C. According to Annex XI, section 2, testing for a specific endpoint can be omitted, if it is technically not possible to conduct the study as a consequence of the properties of the substance. This is the case for the endpoint "viscosity" as L-arginine is a solid up to high temperatures and decomposes.