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Description of ASTM-D6342 2012ASTM D6342 - 12Standard Practice for Polyurethane Raw Materials: Determining Hydroxyl Number of Polyols by Near Infrared (NIR) SpectroscopyActive Standard ASTM D6342 | Developed by Subcommittee: D20.22 Book of Standards Volume: 08.03 ASTM D6342Significance and Use 5.1 General Utility: 5.1.1 It is necessary to know the hydroxyl number of polyols in order to formulate polyurethane systems. 5.1.2 This practice is suitable for research, quality control, specification testing, and process control. 5.2 Limitations: 5.2.1 Factors affecting the NIR spectra of the analyte polyols need to be determined before a calibration procedure is started. Chemical structure, interferences, any nonlinearities, the effect of temperature, and the interaction of the analyte with other sample components such as catalyst, water and other polyols needs to be understood in order to properly select samples that will model those effects which cannot be adequately controlled. 5.2.2 Calibrations are generally considered valid only for the specific NIR instrument used to generate the calibration. Using different instruments (even when made by the same manufacturer) for calibration and analysis can seriously affect the accuracy and precision of the measured hydroxyl number. Procedures used for transferring calibrations between instruments are problematic and are to be utilized with caution following the guidelines in Section 16 . These procedures generally require a completely new validation and statistical analysis of errors on the new instrument. 5.2.3 The analytical results are statistically valid only for the range of hydroxyl numbers used in the calibration. Extrapolation to lower or higher hydroxyl values can increase the errors and degrade precision. Likewise, the analytical results are only valid for the same chemical composition as used for the calibration set. A significant change in composition or contaminants can also affect the results. Outlier detection, as discussed in Practices E1655 , is a tool that can be used to detect the possibility of problems such as those mentioned above. 1. Scope 1.1 This standard covers a practice for the determination of hydroxyl numbers of polyols using NIR spectroscopy. 1.2 Definitions, terms, and calibration techniques are described. Procedures for selecting samples, and collecting and treating data for developing NIR calibrations are outlined. 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. 1.3 The implementation of this standard requires that the NIR spectrometer has been installed in compliance with the manufacturer's specifications. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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.
Note 1 This standard is equivalent ISO 15063 .
ASTM Standards D883 Terminology Relating to Plastics D4274 Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols D4855 Practice for Comparing Test Methods E131 Terminology Relating to Molecular Spectroscopy E168 Practices for General Techniques of Infrared Quantitative Analysis E222 Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation E275 Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers E456 Terminology Relating to Quality and Statistics E1655 Practices for Infrared Multivariate Quantitative Analysis E1899 Test Method for Hydroxyl Groups Using Reaction with p-Toluenesulfonyl Isocyanate (TSI) and Potentiometric Titration with Tetrabutylammonium Hydroxide ISO Standard ISO15063 Plastics--Polyols for use in the production of polyurethanes--Determination of hydroxyl number by NIR spectroscopyKeywords chemometrics; hydroxyl number; MLR; multivariate analysis; near-infrared analysis; NIR; PCR. PLS; polyol; polyurethane; raw material; ICS Code ICS Number Code 83.040.10 (Latex and raw rubber) DOI: 10.1520/D6342-12 ASTM International is a member of CrossRef. ASTM D6342The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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