ASTM_D_1766_-_05_2011.pdf

Designation:D176605(Reapproved 2011)Standard Test Method forRubber ChemicalsSolubility1This standard is issued under the fixed designation D1766;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 test method covers a practical test for the solubilityof commercial chemicals used in rubber products.1.2 It is not a true measure of solubility,since equilibrium isnot approached from both sides,that is,higher temperature andlower temperature.1.3 The test method indicates the total solubility,under theconditions of the test,of all components in the presence of eachother and in the proportions present in the sample.1.4 This test method does not measure the solubility of arubber chemical in rubber.1.5 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.6 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E145 Specification for Gravity-Convection and Forced-Ventilation Ovens3.Summary of Test Method3.1 The test specimen is shaken in a specified volume of adesired solvent at a specified time and temperature.Solids areallowed to settle and a specified aliquot of the clear supernatantsolvent is quantitatively removed,the solvent evaporated,andthe mass of the residue obtained.From the masses of theresidue and original specimen,the solubility of the specimen isobtained by calculation.4.Significance and Use4.1 This test method may be used as a raw materialquality-control tool.5.Apparatus5.1 Containers,capacity approximately 100 cm3(4-oz),glass,screw caps with metal foil liners.5.2 Weighing Bottles,50-cm3,ground-glass,low-form,withcovers.5.3 Mechanical Shaker.5.4 Steam Bath.5.5 Oven,constant-temperature,controllable,110C max inaccordance with Type B of Specification E145.6.Procedure6.1 Place 50 cm3of the desired solvent in each of twosuitable containers described in 5.1.Add,with shaking,asufficient test specimen of the organic chemical in the“as-received”condition to each of the bottles to give apparentsaturation,and then add about 25%more.Close both bottlestightly and place in a mechanical shaker,at room temperature,for a minimum of 4 h.6.2 Hold at 23 6 0.5C with occasional shaking for aminimum of an additional 4 h.If a significant quantity of solidsis not in evidence at this point in both bottles,add 25%moreof the organic chemical to each bottle and repeat both shakingcycles.6.3 Allow the solids to settle and while maintaining thetemperature of the solution at 23 6 0.5C,remove this solutionby pipetting 25-cm3aliquots from each of the bottles througha suitable filter stick(Note 1).Transfer the contents of thepipets into each of two tared,ground-glass,low-form,50-cm3,covered weighing bottles.Call the tare masses A.Cover theweighing bottles immediately.Weigh the bottles and solution.Call these masses B.NOTE1Afilter stick may be made by wiring a small piece of mediumgrade filter paper over the end of a pipet with fine wire.The filter papershould be removed before emptying the pipet.A pressure-type apparatusmay also be used to fill the pipet.6.4 Remove the covers and evaporate the solvent on a steambath.Then place the bottles in an oven maintained at a1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.11 on Chemical Analysis.Current edition approved May 1,2011.Published July 2011.Originally approvedin 1960.Last previous edition approved in 2005 as D1766 05.DOI:10.1520/D1766-05R11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 temperature at least 10C below the melting point of theproduct(but in no case higher than 110C),and dry to constantmass.Place the bottles in a covered desiccator until cool,andthen weigh.Call these masses C.7.Calculation7.1 The solubility may be calculated as follows:Mass g of 25 cm3of solution at 237C 5 B 2 A(1)Mass g of solute in 25 cm3solution at 237C 5 C 2 A(2)Solubility in grams of solute per 100 cm3of solution at 237C(3)5C 2 A!34Solubility may also be expressed as follows:Mass g of solvent in 25 cm3of solution at 237C 5 B 2 C(4)Let D 5 density of solvent at 23/47C.Then:Solubility in grams solute per 100 g of solution at 237C(5)5C 2 A!/B 2 A!#3100Solubility in gra