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Normas ASTM – AENOR
ASTM D4875-99

ASTM D4875-99

Standard Test Methods of Polyurethane Raw Materials Determination of the Polymerized Ethylene Oxide Content of Polyether Polyols

Fecha:
2017-08-16 /Historical
Superseeded by:
Scope:

1.1 Test Method A -Proton Nuclear Magnetic Resonance Spectroscopy (1H NMR) measures polymerized ethylene oxide (EO) in ethylene oxide-propylene oxide polyethers used in flexible urethane foams and nonfoams. It is suitable for diols made from the commonly used initators and containing EO percentages greater than or equal to six. For triols initiated with glycerin and trimethylol propane, an uncorrected EO value is obtained since both initiators have protons that contribute to the EO measurement (see Note 1).

1.2 Test Method B -Carbon-13 Nuclear Magnetic Resonance Spectroscopy (13C NMR) measures the polymerized EO content of ethylene oxide-propylene oxide polyethers used in flexible urethane foams and nonfoams. It is suitable for diols and triols made from the commonly used initiators and containing EO percentages greater than or equal to six.

Note 1-There are no equivalent ISO standards.

1.3 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.

Keywords:
EO polymer; ethylene oxide; NMR; polyethers; polyols; polyurethane raw materials
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