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Day 1082
Hi, Hello everyone
tableware is something we are in contact with every day
meals cannot be separated from it
Its materials are also diverse
There are ceramics, glass, stainless steel, imitation porcelain, plastics, etc.
But there are rumors that
❗️ imitation porcelain and plastic tableware contains formaldehyde?
❗️Toxic or carcinogenic?
Is this true?
What material is the best tableware we use?
Xiongjinping
Beijing University of Chemical Technology
Hyperson of the School of Materials Science and Engineering
Imitation porcelain tableware contains formaldehyde and melamine ?
imitation porcelain main component is melamine resin, while the raw materials of melamine resin are melamine and formaldehyde . These two substances are poisons that make people scared to talk about. So can the imitation porcelain tableware at home still be used?
melamine resin is a very stable polymer formed by the reaction of formaldehyde and melamine together, and will not decompose into formaldehyde and melamine by itself. However, this reaction often cannot achieve a 100% conversion efficiency, and these formaldehydes that do not fully react may evaporate.
The main factors affecting formaldehyde volatility are two:
ꔷ The content of plasticizer
ꔷ Usage temperature
In the process of producing tableware, manufacturers will add plasticizers to melamine resin in order to shape. It is a small molecule used to improve product quality, making the liquidity of plastic products better during processing, but at the same time it will make free formaldehyde in the product easier to precipitate, and the specific amount will vary.
Among the common imitation porcelain bowls on the market, the materials used are divided into A1 melamine, A3 melamine , A5 melamine and A8 melamine according to the ratio of plasticizer and melamine resin.
A1 and A3 melamine :
melamine resin has a lower content, while plasticizer has a higher content. Therefore, A1 and A3 melamine cannot actually be used in tableware . They are very toxic and are not resistant to high temperatures and corrosion. Formaldehyde will precipitate at higher temperatures, especially when hot soup is served, formaldehyde will dissolve directly in.
A inferior imitation porcelain tableware with stronger toxicity is to use urea formaldehyde resin to fake melamine resin. This material will emit formaldehyde gas at 80℃, so direct contact with food is not allowed in national standards.
A5 and A8 melamine:
ꔷ Different uses
A5 melamine: Not used for imitation porcelain tableware, the product is not resistant to dirt and is prone to discoloration and fading.
A8 melamine: can be used for imitation porcelain tableware, with exquisite appearance, lightweight and thermal insulation, and safe use.
ꔷ Different ingredients
A5 melamine: The ingredients contain 70% melamine resin, and 30% of the ingredients are additives, starch, etc.
A8 melamine: The ingredient is 100% melamine resin , non-toxic and odorless.
is within the range of -30℃~150℃, and the amount of formaldehyde released by qualified melamine tableware is minimal, which will not affect human health. , so pay attention to the temperature when using it and do not use it for heating.
Suggestions:
When buying imitation porcelain tableware, A1 melamine, A3 melamine, A5 melamine, and A8 melamine are actually not easy to distinguish between the naked eye, so the safer way to is to buy it through formal channels (such as supermarkets, shopping malls), and remember not to buy it when you catch the cheap ones.
Plastic tableware contains formaldehyde?
plastic tableware is cheap, not fragile, and easy to use, and is also a choice for many families. However, there are rumors online that formaldehyde will precipitate after plastic tableware is heated? Could it cause leukemia ? Is this true ?
In fact, common plastic tableware and fresh-keeping boxes are generally made of polypropylene, and they are also the best heat-resistant among plastic tableware. The number is "5" in the national standard. The main raw material is acrylic . There is almost no plasticizer . Formaldehyde does not exist in this material, so the statement that formaldehyde precipitates after heating is incorrect.
Maximum heating temperature:
Generally speaking, it is safe and reliable to use plastic tableware below 100℃. If the temperature of is too high, it is easy to deform or precipitate harmful solvents. In addition, polypropylene is the only plastic tableware that can adapt to microwave heating, but it is only recommended to heat it at 700W to avoid excessive temperature.
A table of
understands the current commonly used plastics
, which are currently found in the following items. Among them, plastic products marked 1, 2, 4, and 5 are more safe. Formaldehyde cannot be found in the plastics such as , but if the method used is incorrect, then may have other toxic substances .
Material | Common products | Precautions | Precautions |
polyethylene terephthalate | Beverage bottles, barreled water, daily chemicals | heat resistant to 70℃ and easily deformed. It may release carcinogens for 10 months. It is safer to use once or twice. It is not recommended to use it repeatedly | |
high-density polyethylene | Food and medicine packaging and cleaning and shower products, such as yogurt bottles, chewing gum bottles, shower gel bottles | is not easy to clean, and it is not recommended to recycle | |
PVC | Plastic bags, table mats, toys little yellow duck, skipping rope, rubber html l5 | will release harmful substances when exposed to high temperatures and fats. It is not advisable to contact food | |
low-density polyethylene html ml5 | Mushel wrap, plastic bags, toothpaste and other hoses packaging | avoid high temperatures and should not contact foods containing fat | |
polypropylene | Fresh preservation box, plastic fast food box, straws, toys, washbasins, etc. | is safe and reliable when used below 100℃. It is easy to deform or precipitate harmful solvents. It can adapt to microwave heating, but only recommended 700W Heat | |
polystyrene | fast food boxes, transparent packaging boxes, disposable plastic tableware, etc., self-service trays, etc. | avoid high temperatures, otherwise there is a risk of release of a carcinogenic substance "aromatic hydrocarbons". It can only be used once, cannot be heated repeatedly, and it cannot be used for microwave heating | |
Other | Water cup, mineral water bucket, suitcase, yoga mat, imitation porcelain tableware, etc. | Except for Tritan (copolyester), it is not advisable to contact food |
What material should we choose?
To sum up, among the various plastics, the best choice is polypropylene., but even polypropylene should be paid attention to the conditions of use and replaced in time.
In comparison, although glass and ceramics are fragile, they are more secure than plastic and imitation porcelain tableware. also has more choices in appearance and shape.
If you must use plastic and imitation porcelain tableware, is especially for children, then must understand the relevant knowledge, judge whether the product is safe, and use it at the specified temperature and replace it in time.
Tips for using tableware
The safest way to buy imitation porcelain tableware is to buy it through formal channels (such as supermarkets, shopping malls), and remember not to buy cheap ones. Pay attention to the temperature when using it, and do not use it for heating.
3. Although glass and ceramics are fragile, they are more secure than plastic and imitation porcelain tableware.
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