Plastics are everywhere in our lives. Many mineral water bottles, cups and tableware that we use in our daily life are made of plastic.
But you should know that plastic can't be used indiscriminately. Some plastic utensils can't withstand high temperature. If the temperature is too high, it will produce substances harmful to human body. Some plastic products can't be put into the microwave oven, and some can't be filled with acid and alkali. Once used in disorder, it may be harmed by carcinogens.
And all the secrets about plastic are actually written in the digital logo at the bottom of the plastic bottle. Recently, @ China Science and Technology Museum released a short video about Tik Tok, which helps netizens distinguish the uses of plastic products made of different materials through the logo on the plastic products:
There are many kinds of plastic materials, and the triangle symbol indicates that it can be recycled.
The material marked with 1 is PET and polyethylene terephthalate, which is easy to produce harmful substances at 70 degrees Celsius. It is often used to make mineral water bottles and carbonated beverage bottles, and cannot be used at high temperature.
Labeled 2, HDPE, high-density polyethylene, commonly used in white medicine bottles and bath products, because it can not be thoroughly cleaned, it is easy to deform and cannot be recycled;
Marked with 3 is PVC, polyvinyl chloride, which has good plasticity and low price, but its performance is unstable at 80 to 85 degrees Celsius, and is often used to make raincoats, plastic films, plastic boxes, etc.
Marked with 4 is LDPE, a low-density polyethylene material, which can be used for cling film and plastic film. It will produce harmful substances at high temperature and is not suitable for making water cups.
Marked with 5 is PP, polyethylene, which is generally visible on soybean milk bottles and microwave lunch boxes, and is also the only plastic product that can be heated in microwave ovens;
Marked with 6 is PS, polystyrene, which can be used for instant noodle boxes and fast food boxes in bowls. It can't be put into the microwave oven, nor can it be put into acid or alkali, which will release carcinogens;
Marked with 7 is PC, polycarbonate, which can be used for water bottles, water cups and milk bottles.
We often use silicone products in our daily life. If we look closely, we will find some signs printed on the bottom of some silicone products. So what do these signs on silicone products represent?
As a member of the silicone products factory, Bian Xiao is no stranger to these signs. Take this silicone popcorn bowl delivered today as an example. There are some common signs at the bottom.
The first sign is a stove and a diagonal line, which means it is forbidden to use open flames.
The second sign is pot and diagonal line, which is a sign that it is forbidden to use directly on cookers such as induction cookers.
The third sign is scalpel and stick, which means to avoid scratching the silicone product with sharp objects and prevent the silicone from scratching and cracking.
The fourth symbol is thermometer, which represents the temperature range of this product, with high temperature of 260℃ and low temperature of -40℃.
The fifth symbol is the wine glass and fork, which is the symbol of food-grade silicone products, representing that it can be used in the food field.
Today's silicone tips are shared here.