test for hydroxyl group

1.2 Review the current appropriate Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety precautions. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. 5.1 Hydroxyl is an important functional group and knowledge of its content is required in many intermediate and end use applications. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated, with its use. Related Products Start studying hydroxyl group. E335 Test Method for Hydroxyl Groups by Pyromellitic Dianhydride Esterification Test Method C is recommended when the results are required in a minimum period of time or where ambient temperature for the reaction is desired. For specific hazards see Section 9. 1.2.1 Test Method A is recommended for general 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. Its chemical formula is written as either -OH or HO-. Products and Services / Standards & Publications / Standards Products, Active Standard ASTM E1899 | Developed by Subcommittee: D16.12, Permissions to reprint documents can be acquired throughCopyright Clearance Center   This test method is for the determination of primary and secondary hydroxyl groups and can be used for the assay of compounds containing them. 5.2 This test method has the following advantages over other hydroxyl number methods: It is rapid (10 min), pyridine-free, ambient temperature, small sample size, applicable to extremely low hydroxyl numbers (<1), and is amenable to automation. Have you ever seen … A hydroxyl group is composed of one hydrogen atom bonded to one oxygen atom. D1957 Test Method for Hydroxyl Value of Fatty Oils and Acids, D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials, E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals, E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis, E203 Test Method for Water Using Volumetric Karl Fischer Titration, E326 Test Method for Hydroxyl Groups by Phthalic Anhydride Esterification, E335 Test Method for Hydroxyl Groups by Pyromellitic Dianhydride Esterification, E567 Test Method for Tertiary Hydroxyl Groups with Hydrogen Bromide, ICS Number Code 71.040.40 (Chemical analysis), UNSPSC Code 12352100(Organic derivatives and substituted compounds), ASTM E222-17, Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation, ASTM International, West Conshohocken, PA, 2017, www.astm.org, Other methods for determination of hydroxyl groups are given in Test Methods, Specific hazards statements are given in Section. Test Method B is included to give a standard procedure for the method that has been used widely. 1.1 These test methods cover the determination of hydroxyl groups attached to primary and secondary carbon atoms in aliphatic and alicyclic compounds and phenols. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. 1.2.4 The interferences are essentially the same for the three methods. E222 Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation. 1.3 The values stated in SI units are to be regarded as standard. The documents listed below are referenced within the subject standard but are not provided as part of the standard. 4.1 Hydroxyl is an important functional group, and knowledge of its content is required in many intermediate and end use applications. This test method is applicable to polyacetals, temperature sensitive materials, high solids polymer polyols, and rigid polyols. The precision of Test Methods A and C is consistent over a wide range of hydroxyl content (tested over hydroxyl number range of 250 to 1600), whereas Test Method B is less precise at the higher hydroxyl content level than it is at the lower hydroxyl content level. Partly as a result of such bonds, native cellulose behaves much like a cross-linked polymer, melting only with chemical decomposition—and therefore precluding melt-spinning into fibres. 1.4 Review the current appropriate Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety precautions. Standard References. Tests for Alcoholic Group Alcohols are compounds in which the hydroxyl group (-OH) is linked to aliphatic carbon chain or in the side chain of an organic compound. Link to Active (This link will always route to the current Active version of the standard. Link to Active (This link will always route to the current Active version of the standard. Test for Alcoholic (R-OH) Group Sodium metal test Ester test Ceric ammonium nitrate test Acetyl chloride test Iodoform test E335 Test Method for Hydroxyl Groups by Pyromellitic Dianhydride Esterification. The documents listed below are referenced within the subject standard but are not provided as part of the standard. 1.1 This test method covers the determination of hydroxyl groups attached to primary and secondary carbon atoms in aliphatic and cyclic compounds and phenols. Note 1: Other methods for determination of hydroxyl groups are given in Test Methods D817, D871, D1957, D2195, D4252, D4273, D4274, E222, E326, and E335. Other available test methods listed in Note 1 are not suitable for many of the sample types listed above. Note 1: Other methods for determination of hydroxyl groups are given in Test Methods D1957, D2195, E326, E335, and E567. The ‘-‘ represents the carbon to which the hydroxyl group is bonded. 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. Hydroxyl Functional GroupThe R in the structural formula stands for the carbon backbone of the organic molecule to which the hydroxyl attaches. D817 Test Methods of Testing Cellulose Acetate Propionate and Cellulose Acetate Butyrate, D871 Test Methods of Testing Cellulose Acetate, D1957 Test Method for Hydroxyl Value of Fatty Oils and Acids, D4252 Test Methods for Chemical Analysis of Alcohol Ethoxylates and Alkylphenol Ethoxylates, D4273 Test Method for Polyurethane Raw Materials: Determination of Primary Hydroxyl Content of Polyether Polyols, D4274 Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols, E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals, E222 Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation, E300 Practice for Sampling Industrial Chemicals, E326 Test Method for Hydroxyl Groups by Phthalic Anhydride Esterification, E335 Test Method for Hydroxyl Groups by Pyromellitic Dianhydride Esterification, ICS Number Code 71.040.40 (Chemical analysis), ASTM E1899-16, Standard Test Method for Hydroxyl Groups Using Reaction with p-Toluenesulfonyl Isocyanate (TSI) and Potentiometric Titration with Tetrabutylammonium Hydroxide, ASTM International, West Conshohocken, PA, 2016, www.astm.org, Other methods for determination of hydroxyl groups are given in Test Methods.

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