PEROXIDE-FORMING CHEMICALS IDENTIFICATION, MANAGEMENT AND HANDLING
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1 PEROXIDE-FORMING CHEMICALS IDENTIFICATION, MANAGEMENT AND HANDLING
2 WHAT ARE PEROXIDES? Chemicals that can react with oxygen A compound containing an oxygenoxygen single bond They are useful catalysts BUT - Peroxides can be EXPLOSIVE!!!
3 CLASSES OF PEROXIDES Severe Peroxide Hazard (Group 1) Becomes explosive when exposed to water in the air Order in small amounts and dispose of 3 months after opening Concentration Hazard Become explosive upon concentration (evaporation, distillation) Shock and Heat Sensitive Become explosive when exposed to shock or heat Potential Peroxide-forming chemicals Have the potential to become explosive Dispose of 12 months after opening or conduct 6-monthly peroxide tests
4 WHAT TO LOOK FOR Precipitate formations are dangerous and warn of peroxide formation Crystals Cloudiness String-like formations Stratification DO NOT PICK UP OR SHAKE bottles containing potential peroxide-forming chemicals
5 WHAT CAN HAPPEN This bottle is Isopropyl ether formed crystallised peroxide while sitting on a shelf Safe detonation resulted in a crater in the ground approximately 1m wide and 50cm deep
6 IF YOU SUSPECT PEROXIDE FORMATION Inspect the contents of bottles prior to opening. Check the bottom of the bottle and around the lid If crystals have formed DO NOT OPEN The friction of opening this bottle will detonate the peroxide crystals The result could be an explosion and serious injury
7 IF YOU SUSPECT PEROXIDE FORMATION If you suspect peroxides have formed DO NOT OPEN the container! Report it immediately to a technical officer or laboratory supervisor
8 MANAGEMENT OF PEROXIDE-FORMING CHEMICALS Only order small amounts of peroxide-formers for immediate use rather than bulk amounts for storage Store in tightly sealed, dark amber glass containers A label must be added to the container to record: Date of arrival Date of opening Peroxide test results Inspect container for signs of peroxide formation prior to opening Avoid distillation of peroxide-formers Pre-test any potential peroxide-formers for peroxide formation immediately before distillation Most explosions occur when peroxides are distilled to dryness
9 TESTING FOR PEROXIDE FORMATION Potential peroxide-formers must be tested every 6 months with peroxide detection strips (see local technical staff for strips) If concentration is over 10ppm and there are no other signs of peroxide formation the chemical must be disposed of through regular chemical waste channels Severe peroxide hazard (Group 1) chemicals must be disposed of 3 months after opening Do not test old bottles, or bottles that you suspect contain peroxides
10 USING PEROXIDE TEST STRIPS Put on PPE Carefully inspect the bottle for signs of peroxides Pour a small amount of chemical into a beaker Immerse the strip into the liquid for 1 second For organic solvents gently fan the strip for up to 30 seconds to evaporate the solvent For aqueous solutions allow the excess to run off via the long edge of the strip onto paper towel for 5 seconds Determine which colour field the strip matches on the test kit Read off the corresponding result Record the result on the container
11 CHEMICALS THAT FORM PEROXIDES Common Group 2 chemicals test every 6 months (check MSDS for others) All ethers (e.g. diethyl ether) Propan-2-ol (aka 2-propanol & isopropanol) Dioxane Tetrahydrofuran Picric acid Acetaldehyde Cyclohexanol Cyclohexene Group 1 dispose after 3 months Butadiene (liquid monomer) Chloroprene (liquid monomer) Divinylacetylene (DVA) Di-iso-butyl ether Ethyl vinyl ether Isobutyl ether Isopropyl ether (Diisopropyl ether) Potassium amide Potassium metal Sodium amide (sodamide) Tetrafluoroethylene (liquid monomer) Vinylidene chloride (1,1-dichloroethylene) This is not an exhaustive list. You need to identify all chemicals within your work area that can form peroxides. Check the MSDS for Risk phrase 19 (R19) or AUH019 for GHS-classified chemicals
12 SUMMARY Treat peroxide-forming chemicals with extreme caution If in doubt ask for assistance Thank you for your attention
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