容重小的材料，一般导热泪盈眶系数也小，但同时机械强度也随之降低，故要合理选择。
Bulk density of small materials, heat conduction tear your eyes coefficient is generally small, but at the same time decreases in the mechanical strength, so be reasonable choice.
应变率增加，材料强度提高，屈强比增大，塑性略有降低，但流变阶段应变率强化系数基本不变。
Raising the testing strain rate, the strength and yield ratio increased the plasticity slightly decreased, but the strain rate hardening index kept constant.
随着紫胶用量的增加，膜的溶胀倍数、水蒸气透过系数先降低后变化不大，而拉伸强度上升；
With the increase of lac dosage, solvent swell and water vapor permeability decreased first followed by insignificant change, while tensile strength increased.
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