Carbon-13 Nuclear Magnetic Resonance Spectroscopy(carbon-13 NMR), measures the primary hydroxyl content of ethylene oxide-propylene oxide polyethers used in preparing flexible foams. It is best suited for polyethers with primary hydroxyl contents of 10 to 90 %. Note 1 -There is no equivalent ISO standard. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ANSI/ASTM D4273-1999由美国国家标准学会 US-ANSI 发布于 1999,并于 2000-01-18 实施。
ANSI/ASTM D4273-1999 在中国标准分类中归属于: G31 合成树脂、塑料基础标准与通用方法,在国际标准分类中归属于: 83.080.20 热塑性塑料。
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