Every family has slippers and everyone wears them. Have you ever noticed that some plastic slippers on the market, which are obviously new, emit a pungent smell, especially some cheap plastic slippers, which smell disgusting. What's in the smell?

Classification of slipper sole materials

TPR material: thermoplastic rubber material. According to its process, it can be divided into TPR soft sole, TPR hard ground and TPR side seam sole. Many friends also said that rubber sole, ox tendon sole, blow molded sole and adhesive sole can be classified into this category.
Features: soft, waterproof, with a certain degree of wear resistance, which is the familiar rubber feel to the touch.

EVA material: ethylene vinyl acetate copolymer (also known as ethylene vinyl acetate copolymer) is prepared by copolymerization of ethylene (E) and vinyl acetate (VA), referred to as EVA. Most slippers in hotels and Korean dramas belong to this kind.
Features: firm, light, easy to clean, comfortable, breathable, soft, colorful. Easy processing, easy adhesion, not easy to fall off. Suitable for beach shoes, home casual slippers, travel slippers, etc.

PVC material: PVC (Polyvinyl chloride). Generally, there are two kinds of split. One is that when soft PVC is mixed, an appropriate amount of foaming agent is added to make a sheet, which is foamed into foam plastic to make a foam PVC sole; The other is to use injection molding machine with various molds to make PVC soles.
Features: It has good physical and chemical properties, light weight, strong gloss, but lacks texture.

Where does the toxic gas from slippers come from?
Generally, there are three sources of pungent odor:
Type 1: Industrial raw materials for plastic products
The industrial raw materials of plastic products mostly contain PVC
And other plastic additives
In high temperature environment
Many chemical components will decompose rapidly
So as to emit a pungent chemical smell

Type 2: The production of slippers is mixed with old materials
Some slippers on the market smell terrible
The peddler said that the taste was strong because of "old materials"
The so-called "old materials" are recycled old slippers
Men's slippers are basically made of old materials
Some of these old slippers were bought from waste purchase stations
Some were picked up from the garbage collection station
Some don't even know the source
The price is cheap, and the sales volume is excellent
Type 3: Add too much plasticizer
Some inferior slippers are made in small workshops
Small workshops often add too many plasticizers during processing
To increase the processability of slippers
It also makes many slippers smell pungent
For example, the hole shoes shown below
Bright color, full of poison gas
How to choose slippers?
01 Look at the color
Too much pigment is often added to the slippers that are too bright. Most of the pigment contains heavy metals such as lead and cadmium, which is harmful to human health.
02 Smell
Don't buy those with pungent smell! Don't buy! Don't buy! It must be poisonous!!! (Tell important things three times)
03 Weight
Looking at shiny and thinking about light, usually new materials, weighing heavy, mostly old materials.
04 Fold sole
The slippers with good quality will not show white defects when folded by hand. They belong to authentic rubber materials. The soles are not easy to break, flexible and have no peculiar smell. If it is folded, the folded part of the sole begins to whiten immediately. After it is restored to its original state, the folded part changes color and deforms, which is naturally a bad sole. Most of the raw materials it uses are garbage crushed powder, and then it is bleached to add essence.