Distinguish polyethylene and polypropylene bags for you

The difference between polyethylene and polypropylene packaging bags is as follows: The production process of polyethylene and polypropylene raw materials is relatively similar, and the products can be used to make plastic films, injection products, plastic pipes, etc. In many cases, the two raw materials have different properties and uses. great similarity. From the perspective of heat resistance, the heat resistance of polypropylene is higher than that of polyethylene. Usually, the melting temperature of polypropylene is about 40%-50% higher than that of polyethylene, about 160-170 °C, so the product can be Sterilize and sterilize at a temperature above 100 °C, and it will not deform at 150 °C under the condition of no external force. In life we ​​will find“5”Polypropylene lunch boxes are often used to heat food in microwave ovens (the general temperature for microwave heating is 100-140 ℃), while polyethylene cannot be used as plastic for microwave ovens due to its poor heat resistance, including lunch boxes and plastic wrap. Similarly, in the field of ordinary packaging films, polyethylene packaging bags are more suitable for use below 90°C, while polypropylene packaging bags can also be used at relatively high temperatures. From the perspective of rigidity and tensile strength, polypropylene is mainly characterized by low density, better mechanical properties than polyethylene, and outstanding rigidity. From the perspective of low temperature resistance, the low temperature resistance of polypropylene is weaker than that of polyethylene, and the impact strength at 0 °C is only half of that at 20 °C, while the brittleness temperature of polyethylene can generally reach below -50 °C; Increase, the lowest can reach -140 ℃. Therefore, if the product needs to be used in a low temperature environment, polyethylene should be selected as the raw material as much as possible.
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