对于象尼龙和PET这样的吸湿性材料，要确保树脂能得到正确的干燥。
For hygroscopic materials like nylon and PET, make sure the resin is properly dried.
这种接触可以使得对一些材料的试验直接无效，例如纸张、木材、以及其它吸湿性材料。
Such contact invalidates a test on some materials such as paper, wood, or other hygroscopic materials.
此类材料容重小，来源广，多数价格低廉，但吸湿性大，受潮后易腐烂，高温下易分解或燃烧。
Such materials bulk density of small, source, most widely price is low, but the hygroscopicity, damp easily after decay, and high temperature burning or easy to resolve.
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