ASTM D2572 PDF
ASTM D(). Standard Test Method for Isocyanate Groups in Urethane Materials or Prepolymers. standard by ASTM International. Find the most up-to-date version of ASTM D at Engineering ASTM D – 97(). Standard Test Method for Isocyanate Groups in Urethane Materials or Prepolymers. This standard is a part of ASTM Book of Standards.
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This alkalinity is often expressed as CPR controlled polymerization rate of polyether polyols. It is applicable to products derived from toluene diisocyanate, methylene-bis- 4-phenyl isocyanateand polymethylene polyphenyl isocyanates. Other requirements may become necessary and will be added as the necessary test methods become available. There is no equivalent ISO standard. The values stated in SI units are to be regarded as the standard. These test methods also are applicable to many other liquids.
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Standard Practice for Polyurethane Raw Materials: It is suitable for polyethers with hydroxyl numbers of 24 to and primary hydroxyl percentages of 2 asttm The dynamic viscosity can be obtained by multiplying the kinematic viscosity, v, by the density of the liquid. It is suitable for diols made from the commonly used initators and containing EO percentages greater than or equal to six.
Polyurethane Raw Materials Test Methods
The implementation of this standard requires that the NIR spectrometer has been installed in compliance with the manufacturer’s specifications. Both methods are based on the quantitative measurement of absorption bands arising from out-of-plane C-H deformation vibrations of the aromatic ring at cm- superscript: Register for a trial account.
The test method is applicable to products derived from toluene diisocyanate and methylene-bis- 4-phenylisocyanate. 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. The right to access the electronic files of ASTM Standards is for purposes of viewing for individual use only.
Two methods based on infrared spectroscopy are required to give accurate results over a broad range of isomer concentrations. This test method is applicable to polyether polyols and polyether polyol blends that are used in urethane reactions.
They apply only to materials whose colors have light-absorption characteristics similar to those of the standards. Remember me for one month. It is suitable for diols and triols made from the commonly used initiators and containing EO percentages greater than or equal to six. This test method may also be useful for the determination of free isocyanate monomers of other types upon taking precautions to confirm suitability. Content only available by subscription.
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It is applicable only to materials whose color-producing bodies have light-absorption characteristics similar to those of the standards used. News View our resource center to find press releases, testimonies, infographics and more. The values given in parentheses are for information only. The electronic file may not be reproduced in any way.
ASTM D2572 – 97(2010)
Fluorine Nuclear Magnetic Resonance Spectroscopy fluorine NMRmeasures the primary hydroxyl content in ethylene oxide-propylene oxide x2572 used in flexible urethane foams. The difference between the total chlorine content and the hydrolyzable chlorine content see ASTM D is a measure of the amount of o-dichlorobenzene and other ring-substituted chlorinated products that are present.
A blog of the American Chemistry Council: Enter your account email address to request a password reset: Both procedures ashm applicable to a variety of d25572 compounds but the amount of sample used may have to be varied. No items in cart. This test method may also be applied to other isocyanates of suitable solubility. Criteria for building, evaluating, and validating the NIR calibration model are also described. Please sign into an account with a subscription to this content, or email for help at support madcad.
This test method is applicable to polyacetals, temperature sensitive materials, high solids polymer polyols, and rigid polyols.
Criteria for building, evaluating and validating the NIR calibration model are also described. Finally, the procedure for sample handling, data gathering and evaluation are described.
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ASTM – D – Reapproved – Standard Test Method for Isocyanate Groups in Urethane Mate
They also apply to many other hydroxyl-containing substances. Polyurethane Raw Materials Test Methods. The awtm included in this specification are those required to characterize toluene diisocyanate. Procedures for selecting samples, and collecting and treating data for developing NIR calibrations are outlined. The main sources of hydrolyzable chlorine in the s2572 are carbamoyl chloride and dissolved phosgene.
Two test methods are required to give accurate results over a broad range of isomer concentrations. Definitions and calibration techniques are given.
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