What is compostable plastic bag?

March 23, 2022


What is compostable plastic bag?

Compostable plastic bag is a plastic bag made of compostable plastic.

First、Compostable plastics:

compostable plastic refers to a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizers, biodegradants, etc.) added in the production process to reduce its stability and then easily degrade in the natural environment. plastic.


Compostable plastics are generally divided into four categories:

  1. Photocompostable plastic

Incorporating photosensitizers into plastics, the plastics are gradually decomposed under sunlight. It belongs to an earlier generation of compostable plastics, and its disadvantage is that the degradation time is difficult to predict due to changes in sunlight and climate, so the degradation time cannot be controlled.

  1. compostableplastics

Under the action of microorganisms, it can be completely decomposed into plastics with low molecular weight compounds. It is characterized by convenient storage and transportation, as long as it is kept dry, it does not need to be protected from light, and it has a wide range of applications. With the development of modern biotechnology, more and more attention has been paid to compostable plastics, and it has become a new generation of research and development hotspots.

  1. Light/compostable plastics

A type of plastic that combines photodegradation and microorganisms, it has the characteristics of light and microorganism compostable plastics at the same time.

  1. Water-compostableplastics

Add water-absorbing substances to plastics, which can be dissolved in water after use. It is mainly used in medical and sanitary utensils (such as medical gloves), which is convenient for destruction and disinfection.


Tests have shown that most compostable plastics begin to thin, lose weight, lose strength, and gradually break into pieces after 3 months of exposure in the general environment. If these fragments are buried in garbage or soil, the degradation effect is not obvious.

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