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Material characteristics of polyethylene bottles

Carrie May 22,2019 Share this post:

Many of our common vaccine plastic bottles are made of polyethylene. Polyethylene bottles are used in medical veterinary packaging. Polyethylene is abbreviated as PE as a thermoplastic resin obtained by polymerization of ethylene. Industrially, copolymers of ethylene and a small amount of an α-olefin are also included. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (low temperature can reach -100~-70 °C), good chemical stability, and can resist most acid and alkali corrosion (not resistant to oxidation) Nature of acid). It is insoluble in common solvents at room temperature, has low water absorption and excellent electrical insulation.

Ethylene has good chemical stability and can resist dilute nitric acid, dilute sulfuric acid and any concentration of hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia, amines, hydrogen peroxide, sodium hydroxide, potassium hydroxide, etc. at room temperature. . However, it is not resistant to strong oxidizing corrosion, such as fuming sulfuric acid, concentrated nitric acid, a mixture of chromic acid and sulfuric acid. The above solvent will slowly erode the polyethylene at room temperature, and at 90-100 ° C, concentrated sulfuric acid and concentrated nitric acid will quickly erode the polyethylene to destroy or decompose.

Under the action of the atmosphere, sunlight and oxygen, polyethylene bottles will age, discolor, crack, become brittle or chalk, and lose their mechanical properties. At the molding processing temperature, the melt enthalpy is also lowered due to oxidation, and discoloration and streaking occur. Therefore, attention should be paid during molding processing, use, or material selection.

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