Crawfish season is here again! Wear disposable gloves and start!
Figure丨Zhanku Hailuo
After eating and wiping off the gloves, we often find that our hands are still oily and fragrant.
Hey, this glove is too easy to break. Sure enough, the boss has a black heart and gives consumers defective products in order to save money!
However, the truth is not so simple…
These gloves are oily
The boss really doesn’t necessarily have to use defective gloves for you. However, even brand new, complete disposable gloves are still oily .
Disposable gloves for this kind of eating are generally made of low-density polyethylene . In chemistry, there is a concept called polarity, which affects the physical properties of substances: substances with similar polarities have a good relationship and can blend together; those with a large difference in polarity are distinct.
Low-density polyethylene, our disposable gloves, has a very low polarity, so it can effectively block highly polar substances like water . You use disposable gloves for water, as long as the gloves are not torn.
But the polarity of grease is also very low. Use disposable gloves to hold oil, and the oil will slowly seep out , just like using paper to hold water, the water will always slowly saturate the paper.
No crayfish, wearing disposable gloves for a while with greasy lamp shadow beef shredded Li Xiaokui
Take off the intact gloves, the tiger’s mouth is already leaking oil丨Li Xiaokui
Therefore, when we eat crayfish, a lot of oil in the food will slowly penetrate the gloves. There is nothing to do, just replace it with a new one every once in a while, or wear a few more layers, it will be better.
But it’s cheap!
But what you eat with disposable gloves is generally very oily, such as crayfish, duck necks, sheep scorpions and so on. Why do we have to use this material for disposable gloves?
Without it, it’s cheap and easy to get .
When processing low-density polyethylene, it can be processed very thinly, and the single cost can be controlled very low , while the texture is soft and the strength is acceptable. Therefore, the disposable plastic bags, plastic wrap, and the disposable gloves just mentioned in our lives are usually used.
At the same time, among all types of plastics, the output of low-density polyethylene has always been ranked among the top few. It is a veritable commodity , not scarce at all, and it is easy to obtain raw materials.
If you buy more at a time, it only costs about 5 cents for a pair of gloves. Screenshot of a treasure
There are better materials, but you can’t expect the boss to provide you free of charge when you eat crayfish.
Oil permeable and cheap, safe?
The gloves are oily and always look dirty, plus the price is so cheap that the boss gives them away, some people must start thinking about the safety of disposable gloves.
In general, it is quite safe to wear this kind of gloves to grab and eat .
First of all, the low-density polyethylene itself is non-toxic as a raw material.
Secondly, in the process of processing into such finished products, there is almost no need for additives . At most, powder such as silicon dioxide is used as a mold release agent to facilitate the removal of the finished gloves from the mold.
The toxicity of silica is so small that it can be ignored . If you insist, a meal of crayfish with heavy oil and heavy salt may cause more harm to the body.
In addition, when it comes to plastic products, we will inevitably talk about heat resistance. The heat resistance of low-density polyethylene is really bad, and it will begin to deform when the temperature reaches about 70°C or 80°C.
However, it is limited to deformation and does not release any harmful substances. Besides, you don’t dare to catch something so hot.
Can I stock up on spares at home?
In view of the characteristics of this kind of gloves are cheap, watertight, not much oil permeable in a short time, etc., you can still stock up at home, wear gloves to grab food, mix vegetables with hands, or children paint When you wear it, it has a good anti-fouling effect.
Figure丨Zhanku Hailuo
But to wear it for housework, it is a bit difficult for it .
First, the strength of low-density polyethylene gloves can only be regarded as medium, and it is relatively easy to be worn . If you wear it and brush the floor vigorously and dig through the cracks in the wall, it will inevitably break and wear it as if it was not worn.
Second, many household tasks also touch oil , such as washing dishes and pots, etc. It is obviously not very suitable to use low-density polyethylene gloves.
For disposable gloves for household use, I prefer nitrile rubber gloves .
A disposable nitrile rubber glove丨wikimedia commons/LadyInGrey
This “nitrile” is not a brand. “Butadiene” refers to butadiene, and “nitrile” refers to acrylonitrile—as the name suggests, nitrile rubber gloves are made of these two materials. It is not difficult to see from the word “rubber” that this kind of gloves has good elasticity, is more close to the hand, and is comfortable to use (unlike wearing low-density polyethylene gloves to eat crayfish, which are often eaten).
Wearing it to handle food is very good丨Zhanku Hailuo
Not only that, but the strength of nitrile rubber gloves is not comparable to that of low-density polyethylene, and it is also resistant to acid, alkali and oil . Not to mention washing dishes and pots, even if you wear it to dig out the drain, you don’t have to worry about any major problems.
You can also eat crayfish with it. After all, in the hospital, many gloves used by doctors to examine patients are made of nitrile rubber, which is clean and safe .
Dentist with nitrile gloves丨wikimedia commons
However, nitrile rubber gloves are particularly afraid of sharp things . Once a small hole is poked by the shrimp shell, the gloves will be torn apart along this position, and they will not be able to be used immediately, so they have to be replaced. The unit price of nitrile rubber gloves is higher than that of low-density polyethylene. The average cost is about 1 cents to 3 cents per pair, and a pair of gloves is close to 5 cents. You can wear them at home to eat.
In fact, I recommend eating crayfish directly with hands. Your skin is impermeable to water and oil, not easy to break, safe and non-toxic, free of money, and it will look like new if it gets dirty and washed.
Author: Sun Yafei
Editor: Li Xiaokui
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