SCHEDULE 1 See Explanation a (i) after rule 61-UP, rule 61-UA (1), rule 61-UB (1) (a), and rule 61-UB (2) (1) INDICATIVE CRITERIA AND LIST OF CHEMICALS INDICATIVE CRITERIA Part I (a) Toxic Chemicals : Chemicals having the following values of acute toxicity and which owing to their physical and chemical properties are capable of producing major accident hazards. Sl. No. | Degree of Toxicity | Medium lethal dose by the oral route Toxicity (LD50 body weight of test animals) | Medium lethal dose by the dermal route (dermal LD50 body weight of test animals) | Medium lethal concentration by inhalation (Mg/Kg) route (four hours) LD50 (mg/l) inhalation in test animals | 1. | Extremely toxic | 1 – 50 | 1 – 200 | 0.1 – 0.5 | 2. | Highly toxic | 51 – 500 | 201 – 2000 | 0.5 – 2.0 | | | | | |
(b) Flammable chemicals: (i) Flammable gases/ chemicals which in the gaseous state at normal pressure and mixed with air become flammable and the boiling point of which at normal pressure is 20°C or below; (ii) Highly flammable liquids: Chemicals which have a flash point lower than 23°C and the boiling point of which at normal pressure is above 20°C; (iii) Flammable liquids: Chemicals which have a flash point lower than 65°C and which remain liquids under pressure, where particular processing conditions, such as high pressure and high temperature, may create major accident hazards; (c) Explosives : Chemicals which may explode under the effect of flame, heat or photo-chemical conditions or which are more sensitive to shocks or friction than dinitrobenzene. | 
