ASTM_D_1725_-_12.pdf

Designation:D172512Standard Practice forPreparing Resin Solutions for Viscosity Measurement byBubble Time Method1This standard is issued under the fixed designation D1725;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice provides instructions for preparing resinsolutions viscosity measurement by bubble time method.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 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 limitations prior to use.For specific hazardstatements,see Section 7.2.Referenced Documents2.1 ASTM Standards:2D154 Guide for Testing VarnishesD1545 Test Method for Viscosity of Transparent Liquids byBubble Time MethodD6440 Terminology Relating to Hydrocarbon ResinsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Document:OSHA Regulations,29 CFR,paragraphs 19.10.1000 and1910.120033.Terminology3.1 For definitions related to hydrocarbon resins see Termi-nology D6440.4.Summary of Practice4.1 Solid resins are dissolved in organic solvents by cold-cut or hot-cut methods in the laboratory.The viscosity of suchprepared solutions,or of commercial solutions of resins is thendetermined by the bubble time method(Test Method D1545).The bubble seconds are approximately equal to stokes.5.Apparatus5.1 Bath,constant-temperature,consisting of a cylindricalglass jar of about 5-gal capacity,or an aquarium tank withcontrols capable of maintaining the temperature at 25 6 0.1Cwith water as the bath medium.5.2 Bottles,225-mL(8-oz),wide-mouth,screw cap.5.3 Cellophane,sheet,cut into 102 or 127-mm(4 or 5-in.)squares.5.4 Corks,No.2 short taper,to fit viscosity tubes.5.5 Holder for Viscosity Tubes,preferably a mechanicalholder4with rack and pinion for inverting the tubes.The holdershould be checked with a small level and T-square to makecertain it holds the tubes in an exact vertical position afterbeing placed in the constant-temperature bath.5.6 Bottle Shaker,preferably one which will give end-over-end agitation.5.7 Timing Device,such as a stopwatch or electric stopclock capable of being read to a precision of 0.1 s.5.8 Viscosity Tubes,of clear glass and flat bottoms,having10.65 6 0.025-mm inside diameter and 114 6 1-mm outsidelength.Plainly legible lines shall be located on the tubes asfollows:27 0.5 mm100 0.5 mm108 0.5 mmAll distances shall be measured from the bottom outside ofthe tube.The distance between the first and second lines shallbe 73 6 0.5 mm.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.33 on Polymers and Resins.Current edition approved July 15,2012.Published September 2012.Originallyapproved in 1960.Last previous edition approved in 2004 as D1725 04.DOI:10.1520/D172512.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.4Suitable mechanical viscosity tube holders are available from various labora-tory supply companies.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Solvent6.1 The solvent used should be mutually agreed uponbetween the purchaser and the manufacturer.Toluene,xylene,mineral spirits,alcohols,etc.,are used for the preparation ofsolutions of resins.For a given resin,the viscosity obtainedwill depend on the solvent used.In case of dispute,bothlaboratories should use portions of the same batch of solvent.7.Hazards7.1 Consult current OSHA regulations,suppliers MaterialSafety Data Sheets,and local regulations for all materials usedin this practice.8.Preparation of Resin Solutions8.1 The procedure employed for dissolving solid resins willbe dependent upon the chemical nature of the resin under test.Some resins will dissolve readily in cold solvent with moderateagitation,while others must be hot-cut in order to effectsolution.The method of solution shall be agreed upon mutuallybetween the purchaser and the seller since there may bedifferences in solubility or viscosity between solutions pre-pared with and without heat.The solvent concentration mayvary from 30 to 90%and is generally selected to giv