Chemical composition – poly mesh net bags
PP is a non-toxic, odorless, and tasteless milky white highly crystalline polymer. Its density is 0.90–“0.91g/cm3. The onion mesh bag is one of the lightest varieties of all plastics at present. It is particularly stable to water, so it has a good waterproof effect. It has good gloss and uses it widely in general daily necessities products. PE is a thermoplastic resin made by polymerization of ethylene. PE is odorless and non-toxic. It feels like a candle when touched by a hand. It has excellent resistance to Low-temperature performance, good chemical stability, resistance to most acid and alkali corrosion. So it does widely use in commodity packaging.
Chemical properties -poly mesh net bags
PP has high crystallinity and a stable structure, so it has excellent mechanical properties. Temperature and loading rate has a significant influence on the toughness of PP. PP’s anti-bending performance is fantastic, and the products made with it can be bent hundreds of times at room temperature without being damaged. But at room temperature and low temperature, due to its high molecular structure regularity, the impact strength is lacking. Therefore, the finished products of PP are not suitable for storage at low temperatures. However, PP has a good heat resistance and can sterilize the products at a temperature above 100°C. And PP does not deform at 150°C under the condition of no external force. But its embrittlement temperature is -35℃, which means that PP will become embrittlement when it is lower than -35℃, so the cold resistance of PP is not as good as PE.
The chemical stability of Polypropylene is excellent.
In addition to its poor resistance to acidification, concentrated sulfuric acid, and concentrated nitric acid, it has relatively stable reactions with other chemical reagents. Simultaneously, its chemical stability will increase with crystallinity, so Polypropylene is suitable for making various chemical pipes and onion bags bulk.
Polyethene is a thermoplastic with the most significant output and a wide range of uses among plastics. It is polymerized by ethylene and can process by general thermoplastic molding methods. Polyethylene can divide into three categories: high-density polyethylene, low-density polyethylene, and linear low-density polyethylene. PE has excellent chemical stability. It is not affected by various chemical substances such as hydrochloric acid, hydrofluoric acid, potassium hydroxide, etc., at room temperature. But these chemicals do not include nitric acid and sulfuric acid because these two chemicals have a robust damaging effect on PE. Polyethylene is prone to degradation under ultraviolet rays’ action, so onion bags bulk cannot expose to the sun for a long time.