1、Designation:D 29 98Standard Test Methods forSampling and Testing Lac Resins1This standard is issued under the fixed designation D 29;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses ind
2、icates the year of last reapproval.Asuperscriptepsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 These test methods cover procedures for sampling andtesting orange shellac,button l
3、ac,garnet lac,and bleached lac.1.2 The sampling procedures and test methods appear in thefollowing order:SectionsSampling:Orange Shellac,Button Lac,and Garnet Lac3Bleached LacIdentification of Samples45General Requirements for Test Methods:Reagents6Source and Preparation of Portions of Sample forTes
4、ts7Insoluble Matter8 to 9.5Iodine Value10 to 10.3Purity11 to 13.2Volatile Matter(Moisture)14 to 15.2Wax16 to 16.4Matter Soluble in Water17 to 17.2Ash18 to 18.2Color19 to 19.4.3Color of Orange Shellac20 to 20.4.4Acid Value21 to 21.4Orpiment22 to 22.4Saponification Value23 to 23.41.3 This standard doe
5、s 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.Specific hazardstatements are given in
6、Note 1.2.Referenced Documents2.1 ASTM Standards:D 304 Specification for n-Butyl Alcohol(Butanol)2D 331 Specification for 2-Ethoxyethanol2D 1193 Specification for Reagent Water3D 1544 Test Method for Color of Transparent Liquids(Gardner Color Scale)4D 1545 Test Method for Viscosity of Transparent Liq
7、uidsby Bubble Time Method5D 1959 Test Method for Iodine Value of Drying Oils andFatty Acids5E 11 Specification for Wire-Cloth Sieves for Testing Pur-poses6SAMPLING3.Orange Shellac,Button Lac,and Garnet Lac3.1 Lot SizeFor the purpose of sampling,the quantity of alot of any one of these types of lac r
8、esin shall not exceed 500bags or packages.The net weight of lac resin in each bag orpackage shall not exceed 75 kg.3.2 Source and Number of SamplesOnly original un-opened bags or packages shall be sampled.Ten percent of thecontainers in every lot of lac resin shall be taken at random,butnot less tha
9、n 5 nor more than 25 containers shall be taken.3.3 Free-Flowing Lac ResinsIn sampling free-flowing lacresins,samples shall be drawn from different places in eachcontainer in double handfuls or by means of a suitable samplersuch as a grain sampler.A total of approximately 2.7 kg shallbe taken.3.4 Blo
10、cked or Matted Lac ResinPieces of blocked ormatted lac resin shall be chipped with an axe,pick,or othersuitable instrument from each container taken for sampling.Approximately the same amount shall be taken from eachcontainer and the total amount taken shall be about 2.7 kg.Thepieces of lac resin sh
11、all then be ground to pass a No.4(4.75-mm)sieve.All sieves referenced must conform to therequirements of Specification E 11.3.5 Preparation of Samples for Observation or AnalysisWhether free-flowing or rough ground,as in the case ofblocked lac resin,the entire sample representing any lot shallbe tho
12、roughly mixed and divided into halves.The use of amechanical mixer is recommended for mixing the resin and ariffle sampler for dividing it into quarters.When these devicesare not available for use,the entire sample shall be mixed,heaped,and quartered along two diameters that intersect atright angles
13、 and the opposite quarters combined.One half thesample,thus obtained,shall then be mixed and divided intoquarters as before.Each quarter shall be placed in an airtight1These test methods are under the jurisdiction ofASTM Committee D-1 on Paintand Related Coatings,Materials,and Applications and are t
14、he direct responsibilityof Subcommittee D 01.33 on Polymers and Resins.Current edition approved June 10,1998.Published October 1998.Originallypublished as D 29 14 T.Last previous edition D 29 81(l993)1.2Annual Book of ASTM Standards,Vol 06.04.3Annual Book of ASTM Standards,Vol 11.01.4Annual Book of
15、ASTM Standards,Vol 06.01.5Annual Book of ASTM Standards,Vol 06.03.6Annual Book of ASTM Standards,Vol 14.02.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMcontainer,sealed,labeled(Section 5),and s
16、ent to the interestedparties as the“original observation sample.”When agreedupon between the seller and the purchaser,the“originalobservation sample”shall be used for the determination ofvolatile matter(moisture)(Sections 14 to 15,as applicable).The other half of the sample shall be ground to pass a No.10(2.00-mm)sieve,mixed thoroughly,and divided into two equalportions A and B.Portion A shall be labeled the“reservesample.”Portion B shall then be ground to pass a No.25(710-m)sieve,mixed thorough
