若是多层不同材质，先对样品的上下表面进行全反射红外光谱测试，确定上下表层成分。
If the structure is of multi layers, first the upper and the lower surface of the sample go through fully reflective infrared ray test; the components of the upper and lower surface are determined.
请把贵公司经营项目的型号、规格及价格的详情惠送我方。如果可能，请随送不同制造材质的样品。
Would you please send us details of the types, specifications and prices, and if possible, samples of different qualities of material used.
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