Preventing Physical and Chemical Contamination of Food

Physical contamination is any foreign object in food — glass, metal, hard plastic, wood, bone or jewellery — while chemical contamination is unwanted substances such as cleaning agents, sanitiser residue or pest chemicals. Standard 3.2.2 of the Food Standards Code generally requires food businesses to take all practicable measures to protect food from contamination. The core controls are physical barriers, safe chemical storage and separation, and disciplined cleaning and inspection. Key takeaways: Physical hazards are foreign objects (glass, metal, hard plastic, bone, jewellery); chemical hazards are substances like cleaning agents, sanitiser and pest chemicals.. Standard 3.2.2 generally requires food businesses to take all practicable measures to protect food from contamination — a term broad enough to cover physical and chemical hazards.. The most effective controls are prevention-focused: barriers, safe chemical storage away from food, correct decanting and labelling, and clean-as-you-go discipline.. Never store or decant chemicals in unlabelled containers or old food or drink bottles — this is a common and serious cause of accidental chemical poisoning.. Keep Safety Data Sheets, inspect incoming and outgoing food, and record contamination incidents and corrective actions so you can act fast and demonstrate control.. Physical and chemical hazards and their controls: Hazard, Examples, Key control. Physical - glass/hard plastic — Shattered light covers, broken containers, jug lips — Shatterproof covers and containers; breakage clear-and-check rule. Physical - metal — Blade chips, staples, wire from brushes/scourers, foil — Maintain equipment; remove staples at receiving. Physical - natural — Bone, shell, fruit stones, pests — Bone-out, de-shell and de-stone with care; check high-risk items. Physical - personal items — Jewellery, fingernails, plasters, hair, pen lids — No-jewellery, hair-restraint and no-false-nails policy. Chemical - cleaning agents — Degreasers, sanitiser residue, rinse aid — Store away from and below food; correct dilution; rinse/air-dry as directed. Chemical - other — Pesticides, machine oils, fuel or paint fumes — Safe storage and separation from open food. What counts as physical and chemical contamination? Physical contamination is the presence of a foreign object in food that shouldn't be there and could injure someone or make food unsuitable. Chemical contamination is the presence of an unwanted chemical — most commonly cleaning products and sanitisers, but also pest-control chemicals, machine lubricants, or excessive residues. Both are hazards the Food Standards Code expects you to control, and both can occur without changing how the food looks, smells or tastes, which is exactly why they need to be designed out rather than spotted at the last moment. Physical: glass and hard plastic (shattered light covers, broken containers, jug lips). Physical: metal (blade chips, staples, wire from brushes or scourers, foil fragments). Physical: natural objects that pose a risk (bone, shell, fruit stones, pests). Physical: personal items (jewellery, fingernails, plasters, hair, buttons, pen lids). Chemical: cleaning agents, degreasers, sanitiser residue, dishwasher rinse aid. Chemical: pesticides and rodenticides, machine oils, and fuel or paint fumes near open food. Note: allergen cross-contact is a related but separate hazard, managed through allergen controls rather than the chemical-storage measures below. What the law generally expects Under Standard 3.2.2 (Food Safety Practices and General Requirements), food businesses are generally required to take all practicable measures to protect food from the likelihood of contamination — a term broad enough to cover biological, physical and chemical hazards across receipt, storage, processing, display and transport. Separately, many food service and retail businesses that handle unpackaged, potentially hazardous food are now captured by Standard 3.2.2A, which introduces food safety management requirements. Because requirements and enforcement vary by state and territory, confirm exactly what applies to you with your local council and state food regulator. Protect food from contamination at every step, from delivery to service. Store and use chemicals so they cannot contaminate food, surfaces or packaging. Keep the premises and equipment clean, sanitised and in good repair. Standard 3.2.2A generally adds requirements such as food handler training, a food safety supervisor, and being able to substantiate your controls — check whether your business is captured. Requirements and enforcement vary by jurisdiction — confirm what applies with your local council and state food regulator. Controlling physical (foreign object) hazards Physical hazards are best managed by removing the source before it reaches food. Think about where hard, brittle or detachable materials sit near open food, and put a barrier, a rule or a check in place. A useful habit is a 'glass and hard plastic' register that lists brittle items above or near food areas so any breakage triggers an immediate, documented response — clearing and discarding any potentially affected food rather than picking pieces out. Fit shatterproof covers or sleeves on lights above open food and use shatterproof containers. Keep glass and ceramic out of prep and cook areas where practical. Inspect and maintain equipment — chipped blades, worn scourers and flaking surfaces shed fragments. Follow a strict no-jewellery, no-false-nails and hair-restraint policy for food handlers. Remove staples and packaging fragments at receiving, away from open food. Bone-out, de-shell and de-stone with care, and check high-risk items before service. Controlling chemical hazards from cleaning agents Cleaning chemicals cause contamination in three common ways: residue left on surfaces or equipment, spray drift or splashes onto nearby food, and — most dangerously — chemicals decanted into unlabelled or reused food and drink containers, where someone later mistakes them for a drink or an ingredient. Every one of these is preventable with storage discipline, correct dilution, and separating cleaning from food handling in time or space. Store all chemicals in a designated area away from and below food, packaging and ingredients. Never decant chemicals into unlabelled bottles or old food or drink containers — a common and serious cause of accidental poisoning. Label every decanted container clearly with the product name. Clear food away or cover it before cleaning; never spray near open food. Dilute and use products strictly per the manufacturer's instructions, then rinse or air-dry as directed. Keep sanitisers food-safe and observe the correct contact time so no harmful residue remains. Safety Data Sheets, dilution and training A Safety Data Sheet (SDS) explains how to store, dilute, use and respond to a spill of each chemical. Under work health and safety law, businesses generally need to keep a current SDS for every hazardous chemical on site and make sure staff can find and understand it — which supports both workplace safety and food safety. Correct dilution matters in both directions: under-dosing sanitiser leaves surfaces unsafe, while over-dosing can leave harmful residue on food-contact surfaces. Keep a current SDS for every hazardous chemical and store the set where staff can access it quickly. Train staff on which product to use where, correct dilution, and contact and rinse times. Use dosing systems or measured dilution rather than 'a good splash'. Colour-code cloths and equipment to keep cleaning tools out of food zones. Verification: inspection, records and recalls Prevention is the priority, but verification catches what slips through. Inspect food and packaging at receipt and reject anything damaged, leaking or containing foreign matter. Build quick visual checks into prep and plating. If contaminated product reaches a customer, or you find a foreign object in stock, record the incident, isolate the affected batch, and follow your supplier and recall procedures — good traceability turns a potential recall into a contained problem. Check deliveries for damaged packaging, leaks, pests and foreign matter, and reject as needed. Inspect food during prep, cooking and plating for foreign objects. Record any contamination incident, the batch affected and the corrective action taken. Keep supplier and batch traceability so you can isolate and recall product if required. Worked examples: Chemical in a drink bottle: A staff member decants degreaser into an empty soft-drink bottle and leaves it on a shelf near ingredients. Later, someone mistakes it for a drink or an ingredient. This is a common and serious cause of accidental poisoning. Chemicals must stay in their original or clearly labelled containers, never in old food or drink bottles, and be stored away from and below food. A light cover shatters over the pass: A light fitting above the prep bench cracks and sheds fragments. Because a breakage rule is in place, staff immediately clear and discard any potentially affected food rather than picking pieces out, then record the incident. Fitting shatterproof covers and keeping a glass and hard-plastic register means any breakage triggers a fast, documented response. Checklist: Shatterproof covers on lights above open food; glass and ceramic minimised in prep areas. Glass and hard-plastic breakage rule in place (clear, check, discard affected food). No-jewellery, hair-restraint and no-false-nails policy enforced. Chemicals stored in a dedicated area, away from and below food and packaging. Every chemical container labelled; nothing decanted into food or drink bottles. Products diluted and used per instructions, with correct contact and rinse times. Current Safety Data Sheet held for every hazardous chemical and accessible to staff. Deliveries checked for damage, leaks, pests and foreign matter. Contamination incidents and corrective actions recorded, with batch traceability. Common mistakes: Decanting cleaning chemicals into unlabelled or old food or drink bottles — a common and preventable cause of poisoning. Spraying or wiping with chemicals while food sits open nearby. Leaving sanitiser residue by skipping the correct contact time or rinse step. Using bare glass containers or non-shatterproof light fittings above open food. Ignoring worn scourers, chipped blades and flaking equipment that shed metal or plastic. Storing chemicals above or beside ingredients and packaging. Having no SDS on site, or staff who don't know where to find it. Treating a foreign-object find as a one-off instead of recording it and checking the batch.