As a crystalline polymer, PP is the lightest of commonly used plastics, and its density is only 0.9 1g/cm3 (smaller than water). Among general plastics, PP has the best heat resistance, its thermal deformation temperature is 80- 100℃, and it can be boiled in boiling water. PP has good stress cracking resistance and long bending fatigue life, commonly known as "hundred-fold adhesive". The comprehensive performance of PP is better than that of PE. PP products are light in weight, good in toughness and chemical resistance. Disadvantages of PP: low dimensional accuracy, insufficient rigidity and poor weather resistance. It is prone to aging, brittleness and deformation after demoulding. In daily life, the commonly used crisper is made of PP.
As a material
Such as plastic acrylic acid-styrene copolymer (the same as SAN) and acrylonitrile-styrene copolymer.
It is not easy to produce internal stress cracking, with high transparency, and its softening temperature and impact strength are higher than PS. Scientific name benzene
Ethylene/acrylonitrile copolymer, also known as SAN. It is an excellent transparent material. The appearance of AS is water white,
Can be transparent, translucent or opaque. nontoxic
Most applications of AS are based on its transparency, such as lights, pens, lenses, signal lights and lampshades, taxis and so on.
Lighter, speedometer glass, toys, wine glasses, handicrafts, decorations and packaging materials.
There is nothing wrong with hot food or boiled water because of its high thermal deformation temperature. It can be boiled and disinfected. But by
Because of the polar acrylonitrile segment, the container itself will be heated by microwave in the microwave oven, and its temperature is very low.
It exceeds the softening point or even degradation temperature of the material and cannot be heated by microwave oven.
At present, there are three kinds of common plastics on the market: polyethylene, polypropylene and polyvinyl chloride. Among them, PVC is harmful to organisms.
The body is toxic and cannot be used to package food. The other two are non-toxic and can be used safely.
That is to say, it can be used without problems.