The first step in spill control: identify the spill chemical and wastewater classifier products are the perfect method for distinguishing risks in unknown spilled liquids. Classifier strips quickly assist the responder in classifying the spill for proper treatment. Recommended for all emergency response teams.product has an expiration date of 2 years from the date of manufacture when stored in cool, dry location. Chemical risk for : acid of base (pH) 0-13 sensitivity, oxidizers 1 mg/L (1 ppm) sensitivity, fluoride 20 mg/L (20 ppm) sensitivity, petroleum product/ organic solvent 10 mg/L (10 ppm) sensitivity, iodine/chlorinie/bromine 1 mg/L (1 ppm) sensitivity.