Standard specification for polyimide rigid cellular thermal insulation.
聚酰亚胺硬质泡沫热绝缘材料的标准规范
Expanded polystyrene looks like a rigid white foam and is used as packing or insulation.
发泡聚苯乙烯象白色硬泡沫, 用于包装或者绝缘。
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