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These cups are not suitable for drinking water. Do you have any at home? Change it quickly!
These cups are not suitable for drinking water. Do you have any at home? Change it quickly!
Have you found that there are some small rules in the cups used for some drinks we often drink in life: milk tea is made of transparent plastic cups, hot coffee is made of ceramic cups or plastic paper cups, beer is made of glass cups... regardless of the brand, the materials of the cups they use are the same.
Is there anything particular about it? Will cups of different materials have different effects? Let's talk about it today，glass cookware .
Ceramic cup
The ceramic cup is made of kaolin, clay and other raw materials after shaping and sintering. It has the characteristics of high melting point and high hardness, so the cup made of ceramic is durable.
The ceramic cup and ceramic cup use different raw materials, and the sintering temperature is also different: the ceramic cup uses clay, the ceramic cup uses kaolin, and the firing temperature of the ceramic cup is generally lower than that of the ceramic cup, which leads to the different water absorption of the ceramic cup. The water absorption of the high-temperature ceramic cup is low, the surface is easy to clean and will not absorb peculiar smell, and there will be no glaze cracking.
When purchasing a ceramic cup, you can flick it with your fingers. If it is a clear and pleasant sound, it means that its porcelain body is fine and dense; If the voice is hoarse, it is inferior porcelain.
flower receptacle
According to different processes, glasses can be divided into ordinary glasses, tempered glasses and high borosilicate heat-resistant glasses. Ordinary glasses are easy to break and burst when suddenly cold and hot. In order to solve these two shortcomings of ordinary glasses, tempered glasses and high borosilicate heat-resistant glasses came into being.
Drop resistance: high borosilicate heat-resistant glass is equivalent to ordinary glass, while tempered glass is 3-5 times of ordinary glass.
High temperature resistance: the expansion difference caused by the high borosilicate heat-resistant glass cup is small and not easy to be damaged when it is expanded locally; The tempered glass cup is not damaged because of its resistance to pre-stress and the poor expansion resistance of pre-stress formed by tempering.
The working temperature of high borosilicate heat-resistant glass is high, up to 450 ℃, while the maximum temperature of tempered glass is generally not more than 300 ℃, but for drinking hot water, the use of the above two glasses will not crack.
You can put the glass in the refrigerator, cool it and pour boiling water at 100 degrees. If it doesn't crack, it is high borosilicate or tempered glass.
Plastic cup
Generally speaking, the bottom of the plastic cup is printed with numbers or letters, representing the plastic material of the cup.
The transparent cup used in milk tea [polyethylene terephthalate (PET/01)]: transparent, bendable, good crack resistance, light weight, good gas barrier effect, but poor heat resistance, deformation at about 70 ℃, so it can only be used for cold drinks or normal temperature drinks.
Soft transparent plastic cup [polyethylene (PE/04)]: It is not very common, and its heat resistance is not strong. Hot melting occurs when the temperature exceeds 110 ℃.
The non-disposable transparent water cup commonly used in the home [PP/05]: such as the cup used for brushing teeth, has good thermal stability and can withstand 130 ℃ high temperature, but the material is brittle and easy to break.
Hard disposable transparent plastic cup in the restaurant [polystyrene (PS/06)]: this plastic cup has low strength and poor heat resistance.
There is also a common water cup - space cup, which is made of other plastic materials (PC/07).
When dining out, you may also encounter a plastic cup similar to ceramics. It is made of melamine resin and looks a bit like ceramics, but its strength is much higher than that of ceramics, it is not easy to break, and it is non-toxic, tasteless, acid and alkali resistant and safe to use.
If you encounter a cup marked with "PVC/03", which is made of PVC, it is recommended not to use it. Although this material is cheap and has good plasticity, when the temperature exceeds 81 ℃, the harmful substances in the plasticizer will precipitate, which is easy to cause cancer.
paper cup
Paper cups are usually coated with wax or plastic to prevent liquid from seeping out.
The coating of the multi-coated paper cup is usually used to refer to the paper cup coated with polyethylene (PE/04) material. Compared with the uncoated material, the multi-coated material is more stable, smoother and waterproof, and usually has a single or double layer of polyethylene, depending on the quality and durability of the paper cup.
Wax-coated paper cups are generally coated with wax on the outside of the paper cups to enhance the strength and firmness of the paper cups, so that the paper cups will not become soft due to the moisture on the outer wall when filling cold drinks. The paper cup will also be designed as corrugated paper cup and double wallpaper cup, which can warm hands without scalding them.
Stainless steel cup
If ceramic cups and glasses are suitable for indoor use, stainless steel cups are definitely winners in outdoor use and thermal insulation. Double-layer insulated stainless steel cup with cover can keep hot drinks warm for several hours. However, most stainless steel cups often affect the coffee flavor after reuse.
Which materials are harmful to human body?
When it comes to cups that are harmful to human body, you may first think of plastic cups, but there are many kinds of plastic cups. Not all plastic cups are harmful to human body.
Most plastic cups are not resistant to high temperature, such as polystyrene, polyethylene terephthalate, etc. When plastic cups made of the above materials are used to hold hot drinks, styrene monomer and other harmful substances will be produced. However, it is also unscientific to talk about toxicity despite the dose. The migration of styrene monomer mainly depends on the contact temperature, the level of lipid content in the beverage and the time of filling.
The migration amount of styrene monomer is generally not more than 0.025% of its content. If you want to reach the harmful amount of styrene monomer, unless you drink hundreds of hot drinks a day, it will not affect your health.
As mentioned above, the space cup made of epoxy resin will release its monomer bisphenol A under high temperature or light, which is harmful to human body, so most milk bottles will not use epoxy resin now.
Some people think that disposable paper cups are also harmful to human health. In fact, as long as disposable paper cups are not used to hold overheated drinks for a long time, there will be no big problem.
Will the heavy metal in the stainless steel cup exceed the standard? In order to prevent rust, the stainless steel cup has added more than 10% of nickel, manganese and chromium elements to form low carbon steel, but these elements are harmful to human body. Is the stainless steel cup also harmful? Good quality stainless steel cups are in line with national regulations. The migration of chromium will not exceed 0.4 mg/square decimeter. Even in acidic environment for a long time, the migration of chromium ion will not exceed the standard.
It is recommended to use a ceramic cup or a glass cup, which basically will not have the migration of harmful substances.
Ceramic cup for coffee, glass for beer?
When making coffee, many people will choose ceramic cups or glasses instead of stainless steel cups. Why? In fact, this is closely related to the thermal conductivity of the cup material. After brewing coffee or tea, the heat of coffee and tea will be transferred to the cup through heat conduction, and the cup will transfer the heat to the air.
Some studies show that the thermal conductivity of the stainless steel cup is the highest of the three materials (14.3 W/mK). This high thermal conductivity and the temperature balance between the cup and the liquid are relatively fast, which means that the liquid in the stainless steel cup will cool down quickly. The thermal conductivity of ceramic cup is about 3.8 W/mK, and that of glass cup is about 1.1 W/mK. It can be concluded that among the three materials mentioned above, the liquid in the glass can maintain a high temperature for the longest time.
Since the glass is the slowest to dissipate heat and has the best heat preservation effect, why do we usually choose ceramic cups instead of glass cups in coffee shops? On the one hand, since Europeans have been drinking coffee with ceramic cups since the 15th century, and glass has only been industrialized in the 19th century, the traditional culture of coffee has decided to still use ceramics as coffee cups. On the other hand, the glass is easy to be nicked and scratched after collision, which will affect the beauty and other factors. In fact, as long as the ceramic cup is slightly thicker than the glass cup, it can achieve the same thermal insulation effect as the glass cup.
This is also the reason why glasses are often used when drinking beer. Glasses can effectively reduce the heat exchange between the external environment and iced beer, and can make the beer maintain for a longer time
Have you found that there are some small rules in the cups used for some drinks we often drink in life: milk tea is made of transparent plastic cups, hot coffee is made of ceramic cups or plastic paper cups, beer is made of glass cups... regardless of the brand, the materials of the cups they use are the same.
Is there anything particular about it? Will cups of different materials have different effects? Let's talk about it today，glass cookware .
Ceramic cup
The ceramic cup is made of kaolin, clay and other raw materials after shaping and sintering. It has the characteristics of high melting point and high hardness, so the cup made of ceramic is durable.
The ceramic cup and ceramic cup use different raw materials, and the sintering temperature is also different: the ceramic cup uses clay, the ceramic cup uses kaolin, and the firing temperature of the ceramic cup is generally lower than that of the ceramic cup, which leads to the different water absorption of the ceramic cup. The water absorption of the high-temperature ceramic cup is low, the surface is easy to clean and will not absorb peculiar smell, and there will be no glaze cracking.
When purchasing a ceramic cup, you can flick it with your fingers. If it is a clear and pleasant sound, it means that its porcelain body is fine and dense; If the voice is hoarse, it is inferior porcelain.
flower receptacle
According to different processes, glasses can be divided into ordinary glasses, tempered glasses and high borosilicate heat-resistant glasses. Ordinary glasses are easy to break and burst when suddenly cold and hot. In order to solve these two shortcomings of ordinary glasses, tempered glasses and high borosilicate heat-resistant glasses came into being.
Drop resistance: high borosilicate heat-resistant glass is equivalent to ordinary glass, while tempered glass is 3-5 times of ordinary glass.
High temperature resistance: the expansion difference caused by the high borosilicate heat-resistant glass cup is small and not easy to be damaged when it is expanded locally; The tempered glass cup is not damaged because of its resistance to pre-stress and the poor expansion resistance of pre-stress formed by tempering.
The working temperature of high borosilicate heat-resistant glass is high, up to 450 ℃, while the maximum temperature of tempered glass is generally not more than 300 ℃, but for drinking hot water, the use of the above two glasses will not crack.
You can put the glass in the refrigerator, cool it and pour boiling water at 100 degrees. If it doesn't crack, it is high borosilicate or tempered glass.
Plastic cup
Generally speaking, the bottom of the plastic cup is printed with numbers or letters, representing the plastic material of the cup.
The transparent cup used in milk tea [polyethylene terephthalate (PET/01)]: transparent, bendable, good crack resistance, light weight, good gas barrier effect, but poor heat resistance, deformation at about 70 ℃, so it can only be used for cold drinks or normal temperature drinks.
Soft transparent plastic cup [polyethylene (PE/04)]: It is not very common, and its heat resistance is not strong. Hot melting occurs when the temperature exceeds 110 ℃.
The non-disposable transparent water cup commonly used in the home [PP/05]: such as the cup used for brushing teeth, has good thermal stability and can withstand 130 ℃ high temperature, but the material is brittle and easy to break.
Hard disposable transparent plastic cup in the restaurant [polystyrene (PS/06)]: this plastic cup has low strength and poor heat resistance.
There is also a common water cup - space cup, which is made of other plastic materials (PC/07).
When dining out, you may also encounter a plastic cup similar to ceramics. It is made of melamine resin and looks a bit like ceramics, but its strength is much higher than that of ceramics, it is not easy to break, and it is non-toxic, tasteless, acid and alkali resistant and safe to use.
If you encounter a cup marked with "PVC/03", which is made of PVC, it is recommended not to use it. Although this material is cheap and has good plasticity, when the temperature exceeds 81 ℃, the harmful substances in the plasticizer will precipitate, which is easy to cause cancer.
paper cup
Paper cups are usually coated with wax or plastic to prevent liquid from seeping out.
The coating of the multi-coated paper cup is usually used to refer to the paper cup coated with polyethylene (PE/04) material. Compared with the uncoated material, the multi-coated material is more stable, smoother and waterproof, and usually has a single or double layer of polyethylene, depending on the quality and durability of the paper cup.
Wax-coated paper cups are generally coated with wax on the outside of the paper cups to enhance the strength and firmness of the paper cups, so that the paper cups will not become soft due to the moisture on the outer wall when filling cold drinks. The paper cup will also be designed as corrugated paper cup and double wallpaper cup, which can warm hands without scalding them.
Stainless steel cup
If ceramic cups and glasses are suitable for indoor use, stainless steel cups are definitely winners in outdoor use and thermal insulation. Double-layer insulated stainless steel cup with cover can keep hot drinks warm for several hours. However, most stainless steel cups often affect the coffee flavor after reuse.
Which materials are harmful to human body?
When it comes to cups that are harmful to human body, you may first think of plastic cups, but there are many kinds of plastic cups. Not all plastic cups are harmful to human body.
Most plastic cups are not resistant to high temperature, such as polystyrene, polyethylene terephthalate, etc. When plastic cups made of the above materials are used to hold hot drinks, styrene monomer and other harmful substances will be produced. However, it is also unscientific to talk about toxicity despite the dose. The migration of styrene monomer mainly depends on the contact temperature, the level of lipid content in the beverage and the time of filling.
The migration amount of styrene monomer is generally not more than 0.025% of its content. If you want to reach the harmful amount of styrene monomer, unless you drink hundreds of hot drinks a day, it will not affect your health.
As mentioned above, the space cup made of epoxy resin will release its monomer bisphenol A under high temperature or light, which is harmful to human body, so most milk bottles will not use epoxy resin now.
Some people think that disposable paper cups are also harmful to human health. In fact, as long as disposable paper cups are not used to hold overheated drinks for a long time, there will be no big problem.
Will the heavy metal in the stainless steel cup exceed the standard? In order to prevent rust, the stainless steel cup has added more than 10% of nickel, manganese and chromium elements to form low carbon steel, but these elements are harmful to human body. Is the stainless steel cup also harmful? Good quality stainless steel cups are in line with national regulations. The migration of chromium will not exceed 0.4 mg/square decimeter. Even in acidic environment for a long time, the migration of chromium ion will not exceed the standard.
It is recommended to use a ceramic cup or a glass cup, which basically will not have the migration of harmful substances.
Ceramic cup for coffee, glass for beer?
When making coffee, many people will choose ceramic cups or glasses instead of stainless steel cups. Why? In fact, this is closely related to the thermal conductivity of the cup material. After brewing coffee or tea, the heat of coffee and tea will be transferred to the cup through heat conduction, and the cup will transfer the heat to the air.
Some studies show that the thermal conductivity of the stainless steel cup is the highest of the three materials (14.3 W/mK). This high thermal conductivity and the temperature balance between the cup and the liquid are relatively fast, which means that the liquid in the stainless steel cup will cool down quickly. The thermal conductivity of ceramic cup is about 3.8 W/mK, and that of glass cup is about 1.1 W/mK. It can be concluded that among the three materials mentioned above, the liquid in the glass can maintain a high temperature for the longest time.
Since the glass is the slowest to dissipate heat and has the best heat preservation effect, why do we usually choose ceramic cups instead of glass cups in coffee shops? On the one hand, since Europeans have been drinking coffee with ceramic cups since the 15th century, and glass has only been industrialized in the 19th century, the traditional culture of coffee has decided to still use ceramics as coffee cups. On the other hand, the glass is easy to be nicked and scratched after collision, which will affect the beauty and other factors. In fact, as long as the ceramic cup is slightly thicker than the glass cup, it can achieve the same thermal insulation effect as the glass cup.
This is also the reason why glasses are often used when drinking beer. Glasses can effectively reduce the heat exchange between the external environment and iced beer, and can make the beer maintain for a longer time
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