How to Distinguish Pet and Pe Plastic Bottles?

How to Distinguish Pet and Pe Plastic Bottles?

31-08-2022

1. The physical properties of the materials used in plastic bottles are different:

PET plastic bottles

( Multi Specification Cosmetic Container with Flip over Lid )


Polyethylene terephthalate ( PET ) is a colorless transparent substance with a certain luster (indeterminate), or an opaque milky white substance (crystalline form). It is difficult to catch fire and burn, but once burned, although the flame is removed, it can continue to burn. When burning, it will melt and burst into pieces. The flame is yellow, and the edge is early blue. With a slightly sweet, pungent odor. The performance of pure PET is very poor, especially the impact strength and heat resistance are poor, but after the glass fiber reinforcement of cosmetic manufacturers, various properties are greatly improved.


Polyethylene ( PE ) physical properties: polyethylene is non-toxic, tasteless and milky white. Density of 0.91 ~ 0.96g/cm3 is a crystalline plastic. Polyethylene has a certain mechanical strength, but compared with other plastics, its mechanical strength is low and its surface hardness is poor.


2. Different water resistance:

Polyethylene has excellent insulating properties. At room temperature, polyethylene is insoluble in any known solvent, and resistant to dilute sulfuric acid, dilute nitric acid and other acids of any concentration, as well as alkali and salt solutions of various concentrations. Polyethylene has a high degree of water resistance, and its properties can remain unchanged in long-term exposure to water. Cosmetic manufacturers' polyethylene has poor water and gas permeability, while oxygen and carbon dioxide and many organic substance vapors have good performance.


3. Different temperature resistance:

Use temperature-weather resistance: Polyethylene will age and become brittle under the action of heat, light and oxygen. Generally, the use temperature of high pressure polyethylene is about 800C, and the low pressure polyethylene is about 1000C. Polyethylene is cold-resistant, still has good mechanical properties at -600C, and still has a certain softness at -700C. The PE bottle is soft and has a waxy texture to the touch. Compared with the same plastic, the quality is lighter, translucent, and the flame is blue when burning. Common detergent and chemical packaging, such as detergent bottles. The bottom of the bottle is 2 with the eco-friendly logo.


PET bottles are highly transparent, shiny, and have a crisp sound when knocked. Common beverage bottles, snack food bottles, and peanut oil bottles; the bottom of the bottle is an environmental mark of 1.


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