PTFE coating, also known as Teflon coating, is relatively safe under normal use conditions. The following is a detailed analysis of the safety of PTFE coating:
PTFE coating characteristics
● Heat resistance: PTFE exhibits excellent heat resistance and can maintain stable chemical properties in the temperature range of 180 to 260°C, which just covers most of the temperatures required for daily cooking. Even if it is briefly exposed to high temperature, PTFE can maintain its good heat resistance and is not prone to chemical decomposition.
● Low temperature resistance: PTFE also performs well in low temperature environments, can withstand the severe cold of -200°C, maintain its softness and toughness, and avoid brittle cracking.
● Self-lubricating: The surface of PTFE is extremely smooth, and its friction coefficient is close to that of ice. This property gives it natural non-stickiness.
● Chemical stability: PTFE is inert to many chemical substances, and almost does not react chemically with acids, alkalis, salts and solvents, and can resist erosion by various corrosive substances.
● Non-toxic and harmless: Pure PTFE itself is non-toxic and odorless, and has no adverse effects on human health. During the cooking process, it will not release any harmful substances and strictly follow food safety regulations.
Safety analysis of PTFE coating
● Safety under normal use: Authoritative organizations such as the U.S. Environmental Protection Agency (EPA) believe that PTFE will not release harmful substances to the human body under normal use. Pure PTFE material will not react with human skin or stomach acid, and is non-toxic and non-allergic to the human body.
● Risks at high temperatures: Although PTFE performs well in the temperature range of 180 to 260°C, when the temperature exceeds 300°C (some say 260°C), the PTFE coating may begin to decompose and release harmful substances such as perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS). These substances are considered carcinogenic and reproductively toxic, and are potentially harmful to human health. However, in daily cooking, the temperature that the pot can reach is basically around 200°C. Even for frying and stir-frying, the temperature is generally below 250°C, so it is harmless to the human body under normal circumstances.
● Risk of coating peeling: The coating of a non-stick pan may peel off when it is subjected to severe scratches, collisions, or long-term high-temperature baking. Once the coating peels off, if the fragments are mixed into the food, although they are non-toxic, they may affect the taste and appearance of the food. What is more worrying is that the peeling of the coating will expose the metal substrate in the pot. If the metal contains heavy metals or other harmful substances, they may precipitate during cooking, which is harmful to health.
Precautions for using PTFE coated products
● Avoid high-temperature cooking and dry burning: When using non-stick pans, be sure to avoid high-temperature cooking and dry burning the bottom of the pan to prevent the PTFE coating from exceeding the safe temperature range and producing toxic fumes.
● Proper cleaning and maintenance: When cleaning non-stick pans, use a soft cloth or sponge with a mild detergent, and avoid scratching hard or using hard washing tools to prevent the coating from wearing or even falling off.
● Choose special kitchen utensils: To avoid the coating from falling off due to hard kitchen utensils such as shovels, it is recommended to use wooden or silicone kitchen utensils for stir-frying.
Replace kitchenware with damaged coating in time: If the coating is peeling or damaged, the kitchenware should be replaced in time to avoid potential health risks.
In summary, PTFE coating is relatively safe under normal use conditions, but consumers still need to pay attention to avoid potential risks such as high temperature and physical damage when using it.
