求翻译：试验以原配方为基础，使用新型聚醚二醇，改变PU交联点结构，以保持原有材料的优良性能，达到材料对硬度、拉伸强度等方面的要求，同时满足减小密度、节约材料、降低造价的目的是什么意思？

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Testing is based on the original recipe, using isopropyl alcohol, 2 new polyether PU changed to the point, in order to maintain the original structure of the material to achieve good performance, the material hardness, tensile strength requirements, as well as the needs decrease density, cost saving

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Test based on the original formula, using a novel polyether diol, changed PU cross-linked structure, to maintain the excellent performance of the original material, meet the requirements of material hardness, tensile strength, and so on, both to reduce the density, material conservation, cost reduct

The experiment take the original formula as the foundation, the use new polyether two mellow, changes the PU crossing linking structure of dots, maintains the original material the fine performance, achieved the material to aspect and so on degree of hardness, longitudinal strength requests, simulta