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The invention of papermaking. In 105 AD, Cai Lun summed up the experience of his predecessors in Luoyang, the capital of the Eastern Han Dynasty, and improved the papermaking technique, using bark, hemp head, rags, old fishing nets, etc. as raw materials to make paper.

Hydrolyzed polymaleic anhydride is a low molecular weight polyelectrolyte with a relative molecular weight of 400-800. It is non-toxic, easily soluble in water, and has high chemical and thermal stability. The decomposition temperature is above 330°C.

Hydrolyzed polymaleic anhydride is a low molecular weight polyelectrolyte with a relative molecular weight of 400-800.