1、Designation:D 4613 86(Reapproved 1996)Standard Test Method forMeasuring Apparent pH of Water InsolublePhenol-Formaldehyde Resins1This standard is issued under the fixed designation D 4613;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revisi
2、on,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of the appar-ent pH of a water extract of an acetone solution of wa
3、terinsoluble phenol-formaldehyde resin.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limi
4、tations prior to use.2.Referenced Documents2.1 ASTM Standards:D 1193 Specification for Reagent Water2E 70 Test Method for pH of Aqueous Solutions with theGlass Electrode33.Summary of Test Method3.1 Aqueous test solutions are generally used in determiningpH.In this test method the resin is dissolved
5、in acetone,wateris added,and the apparent pH is measured with a pH meter.4.Significance and Use4.1 The hydrogen ion concentration(pH)is of criticalimportance due to its effect on the performance of the endproduct.The pH is widely used in quality control and processcontrol.5.Apparatus5.1 pH Meter,com
6、plying with Test Method E 70.5.2 Beaker,250-mL.5.3 Balance,accurate to 0.1 g.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of th
7、e American Chemical Society,where such specifications are available.4Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.6.2 Water,conforming to Type II of Specification D 1193.6.
8、3 Acetone,reagent grade.6.4 pH Standard Solutions4,7,10 for standardization ofpH meter.7.Procedure7.1 Standardize the pH meter with the 4,7,or 10 standardbuffer in the expected testing range.7.2 Weigh a 10 6 0.1 g specimen of the resin under test intoa 250-mL beaker.7.3 Add 40 mL of acetone and diss
9、olve the specimen.Add40 mL of water and stir for 5 min at room temperature.Allowthe solution to settle for 1 min.Immerse the electrode into thesolution(Caution:Keep undissolved resin away from elec-trode)and record the result.7.4 Wash the electrode with acetone,followed by wateruntil clean or until
10、the pH meter returns to the standard bufferreading.8.Report8.1 Report the pH to 0.1 units.9.Precision and Bias9.1 The precision and bias for this test method have notbeen determined.10.Keywords10.1 pH;phenol-formaldehyde resins;water-insoluble1This test method is under the jurisdiction of ASTM Commi
11、ttee D-1 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.33 on Polymers and Resins.Current edition approved Sept.26,1986.Published November 1986.2Annual Book of ASTM Standards,Vol 11.01.3Annual Book of ASTM Standards,Vol 15.05.4Reagent Chem
12、icals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary
13、,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMThe American Society for Testing and Materials takes no position respecting the validity of an
14、y patent rights asserted in connectionwith any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any suchpatent rights,and the risk of infringement of such rights,are entirely their own responsibility.This standard is subject to revisi
15、on at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make yourviews known to the ASTM Committee on Standards,100 Barr Harbor Drive,West Conshohocken,PA 19428.D 46132
