漂珠是优良的耐热超低密度材料，常用作配制低密度水泥浆。
As a good thermal material with super-low density, microsphere is often used to prepare light-weight cement slurry.
铝基非晶合金的研究在最近些年得到了重视，这缘于人们对高强度低密度材料的需求。
The research of Al-based amorphous alloy is regarded in recent years because of the demand in high strength-low density materials.
然而纱线粗细和某些纺织技术因素影响也会使得一些高密度的材料运用在羽绒制品上效果并不能令人满意，而一些低密度材料却会更合适。
However the yarn size and weaving techniques make some high threadcount material unacceptable for down products and some low threadcount work just fine.
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