无定形材料亦叫散装材料，其种类较多，主要有塑料丝、纸丝、木丝、泡沫块、草类等。它们来源广泛，价格低廉，且多是就地取材，缓冲效果也不错。
另一方面，无定形材料的微观结构不随相变而改变。
On the other hand, the microstructure of amorphous materials does not change with the phase change.
木质素是一种高度聚合的无定形材料，组成木质纤维的胞间薄层将纤维连接起来。
Specifically, lignin is a highly polymerized, amorphous material that makes up the middle lamella of woody fibers and cements the fibers together.
有机化学和矿物化学的结合，以及无定形材料化学和胶体材料化学的结合，是这一世纪混凝土成功的秘诀。
The combination of organic chemistry and mineral chemistry, as well as the combination of non - fixed form material and colloid material chemistry are the secret formula in this century.
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