Guide to the safe handling of solvents in a bituminous ... - Aapaq.org

Record each run in a logbook: keep a record of speed and runtime for each rotor; Never exceed the specified speed limitations of the rotor.• Heating baths, water baths: Heating baths keep immersedmaterials at a constant temperature. They may be filled with a varietyof materials, depending on the bath temperature required; they maycontain water, mineral oil, glycerine, paraffin or silicone oils, with bathtemperatures ranging up to 300 o C. The following precautions areappropriate for heating baths: set up on a stable surface, away from flammable and combustiblematerials including wood and paper; relocate only after the liquid inside has cooled; ensure baths are equipped with redundant heat controls orautomatic cut-offs that will turn off the power if the temperatureexceeds a preset limit; use with the thermostat set well below the flash point of theheating liquid in use; equip with a thermometer to allow a visual check of the bathtemperature. The most common heating bath used in laboratoriesis the water bath. When using a water bath:¨¨¨¨clean regularly; a disinfectant, such as a phenolic detergent,can be added to the water;avoid using sodium azide to prevent growth ofmicro-organisms; sodium azide forms explosive compoundswith some metals;raise the temperature to 90 o C or higher for 30 minutes once aweek for decontamination purposes;unplug the unit before filling or emptying, and have thecontinuity-to-ground checked regularly.• Shakers, blenders and sonicators: When used with infectiousagents, mixing equipment such as shakers, blenders, sonicators,grinders and homogenisers can release significant amounts ofhazardous aerosols, and should be operated inside a biological safetycabinet whenever possible. Equipment such as blenders and stirrerscan also produce large amounts of flammable vapours. The hazardsassociated with this type of equipment can be minimised by:67