Please take note, you are to classified your chemicals ONLY via the information stated in the Material Safety Data Sheet (MSDS) of the chemical.
E.g: With reference to the chemical MSDS, you may rate a chemical with slight toxicity, a flash point of 85°F, stable condition under normal condition with recommended PPE of safety glasses & glove as 130B. Of course you may consider giving it a number for your easy reference.
Of course, to truly understand the types of hazards associated with the chemical, it's to your best interest to read up the MSDS for more details. Shall you have intention to use or purchase this rating sticker, please visit BRADY websites for more information.
Safe working always.