Teflon is found in any household. The advantages of Teflon coated cookware are obvious: They are usually cheap to make and much easier to clean than uncoated cookware. But those non-stick coatings can also have a negative side when not used properly. So, when is Teflon bad for you?
What is Teflon
Teflon is a brand name owned by Chemours/DuPont, its chemical name is Polytetrafluoroethylene (PTFE). It is used as a non-stick coating for cookware. But there are more uses. It is found in many electrical, industrial and medical applications, even in waterproof/breathable outdoor clothing.
So Teflon is actually all around us and we get in contact with it every day. There is still an ongoing debate about whether Teflon is bad for us or not when it enters our body. This could happen in two ways:
Ingestion – cookware such as pans and bowls wear out over time, non-stick coatings get damaged and scratched and small Teflon particles end up in food and find their way into our body.
Inhalation – if non-stick coated pans are heated to very high temperatures, the PTFE may out-gas. Then various toxic substances can be produced which when inhaled may cause symptoms.
Is Teflon bad for you when swallowed?
Even it can be scratched quite easily, Teflon or PTFE is really tough at normal temperatures and will not react chemically with other substances. Even the most aggressive acids, Aqua regia, concentrated hydrochloric acid or nitric acid will not affect it. So the 1% hydrochloric acid of our gastric acid leaves the PTFE completely unaffected.
So because PTFE is chemically “inert“, it does not react at the human body temperature of around 98–99°F (37 ° C). Small parts of Teflon accidentally swallowed will not do any damage to the body. Instead, the swallowed particles leave the body a natural way.
Scratched Teflon cookware poses no health hazard. You do not have to dispose of a pan with a few scratches and can continue to use it.
Is Teflon bad for you when inhaled?
Inhalation of PTFE vapor is a whole different topic. There are several studies that deal with the toxic effect of vapor released when Teflon is overheated. The inhalation of these vapors could cause the so-called Teflon Flu. Flu-like symptoms, such as fever, chills, a dry throat, cough, and shortness of breath may be the result. There are no studies on the long-term effects of repeated inhalation of PTFE vapors.
However, Teflon vapors are much more dangerous to birds: there are several reports from birdkeeper whose animals died after coated pans were left on the stove.
At what temperature do Teflon pans start to evolve gases?
PTFE is inert and non-toxic at low temperatures. However, at temperatures of over 500 degrees F ( 260 °C) the material begins to deteriorate and it melts at over 620 degrees F ( 327 °C).
At those high temperatures, the released vapor with its by-products can be hazardous to birds and may cause symptoms in humans. But as there are no studies on the effects of Teflon vapor in humans been done, it is not really clear from what temperature Teflon can be dangerous to humans.
How high is the temperature in frying in pans?
Most foods are fried at temperatures between 330 to 440 °F. Cooking oils have a smoke point and even refined cooking oils, like Canola oil, starts to smoke at temperatures over 440 °F ( 230 °C ). As a good cook, you try to avoid that anyway.
Even these temperatures are quite close to the manufacturers recommend maximum temperature for Teflon they are rarely exceeded as long as the pan is not empty. Food and cooking oils will buffer the temperature and normally prevent overheating.
But an empty pan on a stovetop gets really hot and will quickly exceed the safe “Teflon temperatures”. Do not leave empty pans on the heated stove!
What temperature does a slow cooker cook at?
Slow cookers warm food only to a temperature of about 175 to 200 degrees Fahrenheit (75 to 95 °C). This is not even half of the maximum temperature before Teflon begins to out-gas.
So is Teflon bad for you?
So Teflon got its pros and cons. If the environment is really important to you, you should do without Teflon. The manufacturing process is troublesome as it produces hazardous by-products, also disposing of old PTFE products is problematic as it can only be recycled to a minor extent.
Good uncoated cookware made of iron, copper or stainless steel or ceramics can last a lifetime with good care. There are many slow cooker models available that use stoneware or steel pots. Although this has no non-stick effect like Teflon and it may take more time cleaning, you are doing something for the environment.