1、ASTM D1b50 93 m 0759530 0070913 b m 4 C T b Designation:D 1650-91 AMERICAN SOCIETY FOR TESTING AND MATERIALS i916 Race St Philadelphia,Pa 19103 Reprinted from the Annual Book ofASTM Standards.Copyright ASM If not lkted i n the current combined Index,will appear in the next edition.Standard Test Meth
2、ods of Sampling and Testing Shellac Varnish This standard is issued under the fixed designation D 1650;the number immediately following the designation indicates the year of original adoption or,in the case of revision,theyear of last revision.A number in parentheses indicates the year of last reapp
3、roval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope and testing of orange shellac and bleached lac varnishes.in the following order:Sampling 5 Purity of Reagents 6 Preparation of Sample I Color 8 to 11 Drying Time 12 to 14 Nonvolatile Matter 15 t
4、o 17 iodine Value 18 and 19 Insoluble Matter 20 to 23 Wax 24 fo 21 Ash 28 and 29 Purity 30 to 34 Acid Value 35 to 37 Saponification Value 38 to 40 1.1 These test methods cover procedures for the sampling 1.2 The sampling procedures and methods of test appear Sections General Requirements for Test Mc
5、thods:1.3 This standard does not purport to address the safety problems associated with its use.It is the responsibility o f the user o f this standard to establish appropriate safety and health practices and determine the applicability o f regulatory limitations prior to use.2.Referenced Documents
6、2.1 ASTM Standards:D 29 Test Methods of Sampling and Testing Lac Resinsz D 1193 Specification for Reagent Water3 3.1 Description o f Terms Specific to This Standard:3.I.1 acid value-the number of milligrams of potassium hydroxide required to neutralize 1 g of the nonvolatile portion of the lac varni
7、sh.3.1.2 lot-For purpose of sampling,a lot shall consist of the entire amount of varnish manufactured as one batch and offered for delivery at one time.3.1.3 saponijlcation value-a measure of the alkali reac-tive groups in lac resins,it is expressed as the number of milligrams of potassium hydroxide
8、 that react with 1 g of the nonvolatile portion of the lac varnish.4.Significance and Use 3.Terminology 4.1 These test methods compiles the common measure-I These test methods are under the jurisdiction of ASTM Committee D-1 on Paint and Related Coatings and Materials and are the direct responsibili
9、ty of Subcommiiice W1.33 on Polymers and Resins.Current edition approved Feb.22,1991.Published April 1991.Originally published as D 1650-59.Last previous edition D 1650-76(1981).Annital Book o f ASTMSlandards,Vol 06.02.Annital Book oJASTM Slandurds.Vols 06.03 and 11.01.ments and procedures for chara
10、cterizing shellac.dures contained in these test methods.4.2 All shellac varnishes should be tested by the proce-SAMPLING 5.Procedure 5.1 A single container shall be taken at random from each lot as representative of the whole.5.2 In case the varnish is packaged in cans or drums of 5 gal(18.9 L)or mo
11、re capacity,thoroughly mix the contents of the container and take a number of small samples from the top,bottom,and intermediate points by means of sampling tube.Mix these small samples to form a composite sample and transfer not less than 1 qt(0.94 L)to a cleap,dry,glass bottle,securely stopper wit
12、h a new clean cork or well-fitting cover or cap,seal,distinctly label,and transmit to the laboratory for test.5.3 When the varnish is packaged in containers of 1 gal(3.8 L)or less capacity,send the original unopened container to the laboratory for test.When this cannot be done,thoroughly mix the con
13、tents of the container and transfer not less than 1 qt to a clean,dry,glass bottle,securely stopper with a new clean cork or well-fitting cover or cap,seal,distinctly labeI,and transmit to the laboratory for test.5.4 Take precautions to ensure that the sampling appa-ratus and the samples themselves
14、are neither contaminated with nor altered by any material not representative of the lot being sampled.Test Methods GENERAL REQUIREMENTS 6.Purity of Reagents 6.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shall conform to the specifi
15、cations of the Committee on Analytical Reagents of the American Chemical Society,where such specifications are aailable.Other grades may be used,provided it is first ascertained that the reagent is of sufficiently high puritxto permit its use without lessening the accuracy of the determination.6.2 U
16、nless otherwise indicated,references to water shall be understood to mean reagent water conforming to Specifi-cation D 1193,Type IV.“Reagent Chemicals,American Chemical Socicty Specifications,”Am.Chem.Soe.,Washington,DC.For suggestions on the testing of reagents not listed by the American Chemical Society,see“Reagent Chemicals and Standards,”by Joseph Rosin,D.Van Nostrand Co.,Inc.,New York,NY,and the“United States Pharmacopeia.”1 NOTICE:This standard has either been superseded and replaced by a
