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HAZARDOUS SUBSTANCES

HAZARDOUS SUBSTANCES. HSNO Flammable Classes 3 and 4. Flammable Liquids - Class 3. 3.1 Liquids category A, B, C, & D 3.2 Liquid Desensitised explosive category A, B, & C. Class 3.1 Flammable Liquids. Class 3.1A - very high hazard

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HAZARDOUS SUBSTANCES

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  1. HAZARDOUS SUBSTANCES HSNO Flammable Classes 3 and 4

  2. Flammable Liquids - Class 3 • 3.1 Liquids • category A, B, C, & D • 3.2 Liquid Desensitised explosive • category A, B, & C

  3. Class 3.1 Flammable Liquids • Class 3.1A - very high hazard • flash point of less than 230C and initial boiling point <350C • e.g: ether • Class 3.1B - high hazard • flash point of less than 230C and initial boiling point >350C • e.g.: acetone

  4. Class 3.1 Flammable Liquids • Class 3.1C - medium hazard • Flash point greater or equal to 230C, but less than 600C • Class 3.1D - low hazard • Flash point greater than 600C, but less than or equal to 930C

  5. Class 3.2 • 3.2A - liquid desensitised explosives: high hazard • 3.2B - liquid desensitised explosives: medium hazard • 3.2C - liquid desensitised explosives: low hazard

  6. Class 3 - Safe handling • Containers of 3.1A shall only be opened or decanted in fume cupboards • Bottles of ready to use reagents stored on benches or shelves should not exceed • 1 litre for category A substances • 2.5 litres for category B substances • The opening and pouring of all flammable liquids should be carried out in a fume cupboard

  7. Class 3 - Safe handling • Open containers for as short a time as possible - not exceeding 10 minutes, with the following max. volumes • 1.5L decanted volume of any flammable liquid with a flash point less than or equal to 100C above ambient temperature, or; • 5L decanted volume of any flammable liquid with a flash point greater than 100C above ambient temperature

  8. Class 3 - safe handling • Spill - absorb using sand or substance suitable for absorption of the liquid • Emergency plans • Extinguish any ignition sources - vapour heavier than air and will sink down to lowest level

  9. Class 3 - safe handling • Storage cabinets - no ignition sources, secondary containment • No more than 100 litres per cabinet, max. 20 litres per container • Secondary containment to hold 50% • Refrigerators used to store flammable substances must be spark proof and labelled • external thermostats and light fittings removed

  10. Class 3 - safe handling • Storage of substances category A not to exceed 5 litres e.g.: ether (trackable) • 20 litres maximum for all other categories • If in laboratory, must be an approved container or storage cabinet. • DG Store (certified) for bulk storage

  11. Flammable Vapours • Less than 0.5ml of residual ethanol in a 2.5 L Winchester can produce a saturated air/ethanol vapour mixture. Refilling a 2.5 L Winchester which has held ethanol at 190C will release 2.5 litres of a saturated ethanol vapour/air mixture. This can result in over 42 litres of flammable vapour!

  12. 4.1.1 Readily combustible 4.1.2 Self reactive 4.1.3 Solid Desensitised explosive 4.2 Spontaneously combustible 4.3 Dangerous when wet Class 4 - Flammable, Solids

  13. Class 4 - Flammable Solids • 4.1.1A - readily combustible solids and solids that may cause fire through friction - medium hazard • 4.1.1B - readily combustible solids and solids that may cause fire through friction - low hazard

  14. Class 4 - Flammable Solids • 4.1.2A - self reactive substances, type A • 4.1.2 (B - G) - self-reactive substances • 4.1.3A - Solid desensitised explosives: high hazard • 4.1.3B - Solid desensitised explosives: medium hazard • 4.1.3C - Solid desensitised explosives: low hazard

  15. Picric Acid • Classes 4.1.3A, 6.1B, 6.3B, 6.5B, 8.3A, 9.1D, 9.3B • Class 1.1D but controls only apply to large quantities (25 - 50kg +) • toxic, explosive, corrosive and ecotoxic

  16. Class 4 - Flammable Solids • 4.2A - spontaneously combustible substances:pyrophoric substances:high hazard e.g.: phosphorus (yellow/white, dry or in solution) • 4.2B - spontaneously combustible substances: self-heating substances: medium hazard e.g.: potassium hydrosulphite • 4.2C - spontaneously combustible substances: self-heating: low hazard

  17. Class 4 - Flammable Solids • 4.3A - solids that emit flammable gas when in contact with water: high hazard • Calcium Carbide - emits acetylene gas • 4.3B - solids that emit flammable gas when in contact with water: medium hazard • 4.3C - solids that emit flammable gas when in contact with water: low hazard

  18. Flammables requiring tracking • 3.1A (ether) • 3.2A • 4.1.2A • 4.1.2B • 4.1.3A (picric acid) • 4.2A • 4.3A

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