What Are Potentially Hazardous Foods?
Potentially Hazardous Foods (PHFs) are foods that require strict temperature control to prevent the growth of harmful bacteria and reduce the risk of foodborne illness. According to Food Standards Australia New Zealand (FSANZ), PHFs typically have the following characteristics:
- High moisture content – promotes bacterial growth.
- Neutral or slightly acidic pH – ideal for microbial survival.
- High nutrient content – especially protein and carbohydrates, which support pathogens such as Salmonella, Listeria, and E. coli.
These foods are commonly found in homes, cafés, childcare centres, aged care facilities, and hospitality venues. Safe handling is essential to protect public health.
Common Examples of PHFs in Australia
| Category | Examples |
| Meat & Poultry | Raw or cooked beef, lamb, pork, chicken, turkey, ham, sausages |
| Seafood | Raw and cooked fish, oysters, prawns, sashimi, sushi |
| Dairy Products | Milk, cream, soft cheeses (brie, camembert), custards, dairy desserts |
| Eggs & Egg Products | Raw eggs, egg-based dressings (e.g. aioli), mousse, tiramisu |
| Cooked Carbohydrates | Rice, pasta, noodles (especially if stored at room temperature) |
| Ready-to-Eat Meals | Sandwiches with meat or egg, salads with dairy dressings, prepared meals |
| Cut Fruit | Freshly cut melons, fruit salads |
Understanding the Temperature Danger Zone
The Temperature Danger Zone is the range between 5°C and 60°C, where bacteria can multiply rapidly – in some cases doubling every 20 minutes. Foods that spend too long in this range during preparation, storage, transport, or serving can become unsafe.
The 2-Hour/4-Hour Rule
FSANZ recommends the following guidelines:
| Time Left at Unsafe Temperature | Action |
| Less than 2 hours | Refrigerate or use immediately |
| 2–4 hours | Use immediately (do not re-chill) |
| Over 4 hours | Discard the food |
Why the Danger Zone Is Risky
Bacterial Risks
Prolonged exposure to the danger zone can result in contamination by pathogens such as:
- Salmonella spp. – often found in poultry and eggs.
- Listeria monocytogenes – can survive in cold, ready-to-eat foods.
- Escherichia coli (E. coli) – common in undercooked beef.
- Campylobacter – present in raw poultry.
- Clostridium perfringens – linked to improperly stored cooked meat.
High-Risk Groups
Certain people are more vulnerable to foodborne illness, including:
- The elderly
- Pregnant women
- Young children
- Immunocompromised individuals
Safe Handling and Storage Practices
Cold Storage
- Keep refrigerators at 5°C or below.
- Avoid overloading shelves to ensure air circulation.
- Check temperatures daily using a calibrated thermometer.
Hot Holding
- Maintain food at 60°C or above.
- Use preheated Bain-maries, warming trays, or slow cookers.
Cooling and Reheating
- Cooling: Reduce temperature from 60°C to 21°C within 2 hours, then to 5°C within a further 4 hours.
- Reheating: Heat food to at least 75°C before serving.
Time as a Control Measure (TACM)
TACM is suitable for food stalls, outdoor catering, and events with limited equipment, but you must:
- Track start times.
- Keep food out for no more than 4 hours.
- Clearly label foods and discard after the time limit.
Workplace Best Practices
- Receiving & Storage: Check temperatures upon delivery and store food immediately. Use the FIFO (First In, First Out) method.
- Preparation & Service: Wash hands, use sanitised equipment, and separate raw and cooked foods.
- Monitoring: Keep logs for fridges, freezers, and hot displays. Calibrate thermometers regularly.
Legal and Regulatory Requirements in Australia
- National: The FSANZ Food Standards Code outlines safe food storage temperatures, sanitation practices, and hygiene requirements for food handlers.
- State/Territory Regulations: Each state may have additional rules. For example:
- NSW: Food Safety Supervisor certificate and temperature logs.
- QLD: Compliance with the Food Act 2006 and safety programs.
- VIC: Food business classification and registration.
- SA & NT: Local cooling and reheating standards.
- NSW: Food Safety Supervisor certificate and temperature logs.
Mandatory Food Safety Training
Food handlers working with PHFs must complete accredited training such as SITXFSA005 – Use Hygienic Practices for Food Safety to meet legal obligations.
Quick Reference: Safe PHF Temperatures
| Food Type | Safe Storage Temp | Cooking Temp | Reheating Temp |
| Raw Meat | < 5°C | 75°C | 75°C |
| Seafood | < 5°C | 63–75°C | 75°C |
| Cooked Rice | < 5°C | N/A | 75°C |
| Dairy | < 5°C | 60°C+ | 75°C |
When in Doubt, Throw It Out
If a PHF has been in the danger zone for more than 4 hours or shows signs of spoilage, discard it to protect both customers and your business.
Key Takeaways
- PHFs require strict temperature and time control.
- The 5°C–60°C danger zone is where bacteria grow fastest.
- Mishandling can lead to serious foodborne illness.
- Proper training, hygiene, and record-keeping are essential.
Frequently Asked Questions About Potentially Hazardous Foods (PHFs)
1. What is a potentially hazardous food (PHF)?
A PHF is any food that requires temperature control to prevent the growth of harmful bacteria. These foods typically have high moisture content, are neutral or slightly acidic in pH, and are nutrient-rich.
2. What are common examples of PHFs in Australia?
Common PHFs include cooked meats, seafood, dairy products, eggs and egg-based dishes, cooked rice and pasta, ready-to-eat salads with protein, and cut fruits such as melon.
3. What is the temperature danger zone?
The temperature danger zone is between 5°C and 60°C. In this range, bacteria can multiply rapidly, making food unsafe to eat if left too long.
4. What is the 2-hour/4-hour rule for PHFs?
- Less than 2 hours: Use immediately or refrigerate.
- 2–4 hours: Use immediately, do not re-chill.
- Over 4 hours: Discard the food.
5. Who is most at risk from eating unsafe PHFs?
High-risk groups include the elderly, pregnant women, young children, and people with weakened immune systems.
6. How should PHFs be stored safely?
Keep cold food at 5°C or below and hot food at 60°C or above. Use calibrated thermometers, avoid overloading fridges, and store food promptly after delivery.
7. Can I reheat food that has been in the danger zone?
Only if it has been in the danger zone for less than 4 hours. It should be reheated to at least 75°C and consumed immediately.
8. What bacteria are commonly linked to PHFs?
Common pathogens include Salmonella, Listeria monocytogenes, E. coli, Campylobacter, and Clostridium perfringens.
9. What training is required for handling PHFs in Australia?
Food handlers must complete accredited courses such as SITXFSA005 – Use Hygienic Practices for Food Safety to meet FSANZ and state regulations.
10. What should I do if I am unsure whether a PHF is safe?
Follow the rule: When in doubt, throw it out. If food has been left in the danger zone for more than 4 hours or shows signs of spoilage, discard it immediately.
