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he noted that there were other alternatives, such as oxygenated hydrocarbons (methyl formate, methylal) and improved co2 (water) based formulations that provided acceptable foam properties in integral skin foam and in rigid foam when a high thermal performance was not required.
他指出还有其他替代品,如含氧烃(甲酸甲酯、甲缩醛)和改良的二氧化碳(水)基配方,后者在不需要较高热性能的情况下,能在自结皮泡沫和硬质泡沫中提供可接受的泡沫性能。