PE bags and PP bags, also known as polyethylene bags and polypropylene bags, are two commonly used plastic bags in our daily lives. Due to their similar manufacturing processes, they have similar properties and uses. But if carefully distinguished, there is still a certain difference between the two.
1. Firstly, in terms of heat resistance, polypropylene plastic bags are much higher than polyethylene plastic bags, about 40% -50%, up to 164 ℃ -170 ℃, and can be sterilized at high temperatures. In daily life, the microwave lunch boxes we use are usually made of PP material. However, polyethylene has poor resistance to high temperatures and is more suitable for use at temperatures below 90 ℃.
2. Next, in terms of mechanical properties, due to the lower density of polypropylene, PP bags are superior to PE bags in terms of mechanical properties.
3. Next is the aspect of low temperature resistance. Here, polypropylene bags cannot compare to polyethylene bags. The impact strength of polypropylene at 0 ℃ is only about half of that at 20 ℃, while the brittleness temperature of polyethylene can be as low as minus 50 ℃. Therefore, if we want to use plastic bags in low temperature environments, it is better to choose polyethylene bags.
4. Finally, in terms of anti-aging, both of them are not very good in this respect, but polyethylene bags are relatively stronger. Because polypropylene has a side branch composed of a methyl group, it is easily oxidized and degraded under the action of heat and ultraviolet radiation. However, polyethylene molecules contain a small amount of double bonds and ether bonds, resulting in poor weather resistance.
In general, both polyethylene bags and polypropylene bags have their own advantages, so it is better to choose according to different application situations.PE bags and PP bags, also known as polyethylene bags and polypropylene bags, are two commonly used plastic bags in our daily lives. Due to their similar manufacturing processes, they have similar properties and uses. But if carefully distinguished, there is still a certain difference between the two.
1. Firstly, in terms of heat resistance, polypropylene plastic bags are much higher than polyethylene plastic bags, about 40% -50%, up to 164 ℃ -170 ℃, and can be sterilized at high temperatures. In daily life, the microwave lunch boxes we use are usually made of PP material. However, polyethylene has poor resistance to high temperatures and is more suitable for use at temperatures below 90 ℃.
2. Next, in terms of mechanical properties, due to the lower density of polypropylene, PP bags are superior to PE bags in terms of mechanical properties.
3. Next is the aspect of low temperature resistance. Here, polypropylene bags cannot compare to polyethylene bags. The impact strength of polypropylene at 0 ℃ is only about half of that at 20 ℃, while the brittleness temperature of polyethylene can be as low as minus 50 ℃. Therefore, if we want to use plastic bags in low temperature environments, it is better to choose polyethylene bags.
4. Finally, in terms of anti-aging, both of them are not very good in this respect, but polyethylene bags are relatively stronger. Because polypropylene has a side branch composed of a methyl group, it is easily oxidized and degraded under the action of heat and ultraviolet radiation. However, polyethylene molecules contain a small amount of double bonds and ether bonds, resulting in poor weather resistance.
In general, both polyethylene bags and polypropylene bags have their own advantages, so it is better to choose according to different application situations.
