The most complete classification of polymer materials in history

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Macromolecular materials, also called polymer materials, are materials composed of macromolecular compounds as the matrix and with other additives (auxiliary agents). Polymer material classification 1. Classification by source Polymer materials are classified into natural polymer materials and synthetic polymer materials according to their sources. Natural macromolecules are macromolecule substances that exist in animals, plants and … Read more

How to create metal no touch door opener

no touch door opener is hanging on a decorative item. Choosing a keychain with your favorite key not only reflects your personal mood and personality, but also shows your taste and brings you a happy mood. no touch door opener is a general term for neck jewelry. In fact, there are various types of ornaments … Read more