IS 16-1: Shellac, Part 1: Hand Made Shellac

2008·3.4 MB·English

by  Bureau of Indian Standards

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timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 16-1 (2008): Shellac, Part 1: Hand Made Shellac [CHD 23:
Lac, Lac Products and Polishes]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 16(Part 1) :2008
Sf/(rf}2/ 11/..,*

~~I~-~
Indian Standard
SHELLAC- SPECIFICATION
PART1 HAND-MADE SHELLAC
( Fourth Revision)
ICS87060.20
f; BIS 2008
BUR.EAU OF IND IAN STANDARDS
MANAK BHAVA:-;. ') BAHADUR SHAH ZAFAR MARG
:--'"E\V DELHI 110002
October2008 PriceGnJup2
Lac,LacProductsand PolishesSectional Committee.COO23
FOREWORD
This Indian Standard(Part l) (Fourth Revision) was adopted bythe Bureau of Indian Standards.afterthe draft
finalized b)'theLac,LacProductsand PolishesSectionalCommitteehadbeenapprovedbythe Chemical Division
Council.
Thisstandardforshellaccovering hand-madeshellacaswellasmachine-madeshellacwasfirstpublished in 1949.
ItservedasthebasisforinitiatingworkattheleveloftheInternationalOrganizationforStandardization(ISO)and
culminatedintheformulationofISOlRecoml1lendationR56Shellac in 1957. Lateron.theCorrunitteereviewedthe
positioninrespectofadoptionofISOIR56Shellacbymember countriesofISOand inthefourthmeetingofIsorrC
50itwasdecided that specific proposalsforchangesInthe ISO Recommendationbeinvited. On thebasisofthe
proposals receiveditwas seenthat theadoptionofISOfR56was much more satisfactoryin respectofmachine
madeshellacthanofhand-madeshellac. Sincethenumberoftypesand gradesofmachine-madeshellacandhand
made shellac. taken together, was far too big and caused confusion in making reference to the standard. this
standardwasrevisedforthefirsttimeand splitin 1973. While Part Icovered hand-madeshellac, machine-made
shellaciscoveredinPart2.
The second revision wasbased on the discussions during the fourth meeting ofISOrrC 50 that the position in
respectoftheadoptionofgradedesignationsforhand-madeshellacgiven inISOfR56(in linewithIS16)wasnot
satisfactory. SomeproposalswereputforthbyUKandtheyledtothesubmissionofdetailedcounter-proposals by
India. It was based on the Indian country-proposals which received 'substantial degree of agreement at the
international level. One significant changewas that the gradedesignationsof hand-made shellac includedtile
namesofgrades prevalentintrade. Thisstepnecessitatedsomechangesinthehotalcohol insolublematter limn
andcolourindexlimitforGradesA.B,C,DandE.
During this revisionthe requirement for non-volatile mattersolubleincold alcohol had been dropped since the
requirementisappliedinpracticetowasteproductsoflaconly, The methodsforquantitativedeterminationofrosin
hadalsobeendroppedsincethis typeofadulterationisnolongerinevidence.Therequirementforcolourindexis
.givenasessential.ThoughthecolourindexhadbeenmadeanoptionalrequirementinISORecommendation,itwas
decided that colour index should continue as an essential requirement but the purchaser and the supplier
may.byagreement.judgecolourbyvisualexaminationbycomparisonwithanapprovedsample.
Inviewofthedeteriorationinqualityofshellaconstorageand itsusageinfoodandpharmaceuticalindustriesthe
thirdrevisionwasbroughtoutin 1991 toincorporatecertain modificationsinthestandard. Thisrevisionistakenup
toupdatethestandardtomeetthepresent daychallengesbyincorporating the requirementsofHeavymetal and
Lead.
Forthepurpose ofdeciding whethera particularrequirementofthis standardiscompliedwith.the final value.
observedorcalculated,expressingtheresultofatestoranalysis..shallberoundedoffinaccordancewithIS2:1%0
'Rules forroundingoffnumerical values(revised)'. The numberofsignificantplacesretainedilltherounded011
valueshouldbethesame asthatofthe specifiedvalue in thisstandard.
IS16(Part1):2008
Indian Standard
SHELLAC - SPECIFICATION
PART 1 HAND-MADE SHELLAC
(Fourth Revision)
1 SCOPE 5.1.1Thecorrespondencebetweenthestandardgrades
and trade grades isshown below:
1.1 Thisstandard(Part I) prescribestherequirements
and the method of sampling and test for hand-made 51No. Standard Grade TradeGrade
shellac.
a) GradeSpecial i)Kusmi buttonlac
1.2 Thelimits prescribedinthestandardare limits for
ii)Kusmilemonshellac
rejection.
iii)Superiorlemonshellac
2 REFEREN~
b) Grade A i)Lemon No.1shellac
The standards listed below contain provisions. which
ii)Pure Ibuttonlac
through reference in this text.constituteprovisionsof
this standard. At the time ofpublication. the editions iii)Goldenshellac
indicatedwerevalid.Allstandardsaresubjecttorevision iv)Lightpure buttonlac
and parties to agreements based on this standard are
encouraged to investigate the possibility ofapplying c) GradeB Lemon No.2shellac
the most recent editions of the standards indicated d) GradeC i)FOsuperfineshellac
below:
ii)Standard Ishellac
ISNo. TItle
iii)Yelloworangeshellac
4905:1968 Methodsfor-randomsampling e) GradeD PureTNshellac
4908:1968 Glossaryofterms used inlacindustry f) GradeE ITNshellac
6921: 1973 Methods ofsampling and test for lac 6 MANDATORY REQUIREMENTS
and lac products 6.1 MatterInsolubleinHotAlcohol
3 TERMINOLOGY 6.1.1 Shellacshallnotcontainmore thanthefollowing
specifiedbasiclimits ofmatterinsolubleinhotalcohol.
For the purposeofthis standard. the definitions given when determined byeitherof the methods prescribed
inIS4908and thefollowingshallapply. in6ofIS6921. Incaseofdisputethemethod prescribed
in6.2 shall be used as referee method. By agreement
3.1 Approved Sample- The sample agreed upon
betweenthe purchaserand thesupplier.the basic limit
betweenthe purchaserand thesupplierasthestandard
may berelaxed but itshall not in any caseexceed the
forcolourand general appearance.
relaxedlimitprescribed inTable I.
4 FORM ANDCONDITION Table1 MatterInsolubleinHotAlcohol
Shellacshallbeintheformofflakes.orsheets.orbuttons
SI No. Grade Matter Insoluble in lIot Alcohol
oranyotherform agreedtobetweenthepurchaserand ~__~A,- .....
{Basic Limit Relaxed Limit '
thesupplier. The colourappearanceshall beasagreed
upon between the purchaserand the supplier. Percent by Percent by
Mass. Max Mass. Max
5GRADFS
(I) (2) (3) (4)
5.1 There shall be six grades of hand-made shellac. i) Special 0.75 1.0
namely.GradeSpecial.and Grades A. B.C. Dand E.
ii) A 1.0 1.5
Further. the names ofthe grades as prevalent in trade
iii) B 1.25 20
may be indicated in addition in parentheses as sho wn
below: iv) C 1.5 2.5
v) D 2.5 3.5
GradeSpecial (Kusmi Lemon).andGradeB(Lemon
No.2). vi) E 3.0 5.0
IS16(Part1):2008
6.2 ColourIndexorColourandAppearance Table3 AshContent
(Clause7.3)
6.2.1 Thecolourindexofshellac,asdeterminedbythe
methodprescribedin7ofIS6921,shallbenotinexcess 51 No. Grade Ash. Percent
ofthelimitsgiveninTable2. by Mass,
Max
Table2ColourIndex
(I) (2) (3)
51No. Grade Colour Index. Max i) Special 0.5
m ii) A 0.5
(I) (2)
iii) B 0.8
i) Special 6
iv) C 1.0
ii) A 12 v) D 1.0
iii) B 15 vi) E 1.0
iv) C 18 7.4 MatterSolubleinWater
v) D 25 Shellacshallcontainnotmorethan0.5percentbymass
vi) E 30 ofmattersolubleinwaterand the aqueousextractshall
notbeacidictomethylredor aikalinetobromothymol
6.2.2 No colouring matter be added to the material blue. The test shall be carried out according to the
during processing or subsequently. The appearance methodprescribedin13oflS6921.
wouldbedeterminedbythenaturalcolouringpigments
7.5 FlowTest
present inlacresin.
Shellac shall have a flow within the range agreed to
6.3 Rosin
between the purchaser and the supplier. when tested
Shellacshall notcontain any rosin. when tested bythe bythemethodprescribedin21of IS6921.
methodprescribedin9ofIS6921. 7.6 HeatPolymerizationTest
6.4 OrpimentandOtherArsenicalImpurities Shellac shall satisfy a heat polymerization test within
the range oftime as agreed to between the purchaser
6.4.1 Shellac shall not contain any orpiment, when
and the supplier. The methodshall be thatprescribed
testedbythemethodprescribedin14of IS6921except
in22ofIS6921and unlessotherwise agreed,the tem
when aspecified percentage isagreed to between the
peratureoftestshallbe l50"C.
purchaser and the supplier, in which case the
determinationshall becarriedoutasprescribedin20.1 7.7 AddValue
ofIS6921. Theacid valueofshellacshall be fixed. ifdesired. by
agreementbetweenthe purchaserandthesupplier. The
NOTE - Shellac is not expected to contain any orpiment
or any other arsenical impurities but to guard against acid valueofshellac tobe used in food industryshall
inadvertent contamination. when orpiment free shellac is be preferably between73 and 89 when determined by
required. it shall not contain more than 2xI0" percent by
the methodprescribedin16oflS6921.
mass oforpiment and/or other arsenal impurities.
7.8 LeadContent
7 OPTIONALREQUIREMENTS
Thelimit ofleadcontentshall be subjecttoagreement
7.0 The optional requirements given below shall be
between the purchaser and the supplier and the
subject to agreement between the purchaser and the
percentageoflead shall be determinedby the method
supplier.
prescribedin16oflS6921.
7.1 VolatileMatter NOTE - 'Shellac is not expected to contain anylead. but to
guard against inadvertent contamination. when lead-free
Shellacshallnotcontainmorethan2.0percentbymass shellac isrequired. it shallnot contain morethan0.03 percent
ofvolatilematter(moisture).asdeterminedbythemethod bymassof ~ calcu1aledas lead.
prescribedin5ofIS6921. 7.9 Grit
7.2 Wax Themaximumlimitforgritcontentinshellacshallbeas
agreedtobetweenthepurchaserandthesupplier. When
Shellacshallnotcontainwax.inexcessof5.5percentby
required.itshallbedeterminedbythemethodprescribed
mass asdeterminedby the methodprescribedin11of
inDofIS6921.
lS6921.
7.10 IodiDeValue
7.3 Ash
Themaximumlimitforiodinevalueofshellacshallbeas
Shellacshall notleave.onincineration.ashinexcessof agreedtobetweenthepurchaserandthesupplier. When
the limits giveninTable 3.when tested by the method required. itshall be determined by anyoneofthe two
prescribedin12ofIS 6921. methodsprescribed in24ofIS6921.
2
IS 16(Part1):2008
8 PACKING AND MARKING e) Lot number or Code number to trace the lotof
manufacture;and
8.1 Packing
f) Bestbefore12monthsfromdateof manufacturing.
The material shallbepacked asagreed tobetween the
purchaserand thesupplier. 8.2.2 BIS Certification Marking
8.1.1 It isrecommendedthatthematerialbeconsumed Each package ofshellac may also bemarked withthe
as early as possible after purchase; till the time it is Standard Mark.
consumed, the containers shall be stored at low
8.2.2.1 The useof theStandard Mark isgoverned by
soc.
temperaturespreferably4to
theprovisions of theBureauofIndianStandardsAct.
8.2 Marking 1986and theRules andRegulations madethereunder.
The details of conditions under which the licence for
8.2.1 The material shallbemarked withthefollowing the use of the Standard Mark may be granted to
information: manufacturersor producers maybeobtained fromthe
BureauofIndianStandards.
a) Name, standard grade and trade grade (see 5.1
and5.1.1); 9 SAMPLING
b) Netweight; Representativesamples of thematerial shallbedrawn
andtheirconformitydeterminedinaccordancewiththe
c) Indicationofthesourceofmanufacture;
methodprescribed inAnnex A.
d) Month and yearofmanufacture;
ANNEXA
(Clause 9)
SAMPUNGOFSHELLAC
A-I SCALEOFSAMPLING A-1.3.1 These packages shall beselected at random.
Inorder toensuretherandomness ofselection.random
A-l.1 Lot
samplingproceduregiveninIS4905maybeadopted.
All the packages ofthe shellac belonging to the same
batch ofmanufacture, in asingle consignment and of
A·2 PREPARATION OF TEST SAMPLE AND
the same grade shall be grouped together and shall
NUMBEROFTFSfS
constitutealot.
A-1.2 Forascertainingtheconformityofthelottothe A-2.1 Samplesshallbetakeninthemanner prescribed
requirementsofthisspecification,testsshallbecarried in3oflS6921.
outoneach lotseparately.
A-2.1.1 Samplesshall bestored inair-tight containers
A-1.3 The number ofpackages tobeselected(n) shall
attemperaturenotmorethan2O'Cforperiodsuptothree
depend on the lot size (N) and shall bein accordance
months; ifitisintended to keep thesamplesforlonger
withTable 4.
period.theyshallbekeptinarefrigerator.
Table4 NumberoCBagslCooWners
tobeSelectedCorSampling A-2.2 NumberoCTests
St Lot Size No.or Bap! A·2.2.1 Testsformatterinsolubleinhotalcohol,colour
No. Containers to be index,rosin.orpimentandarsenic shallbedoneontwo
Selected
independent samples.
N n
(I) (2) (3) A-2.2.2 Testsforallothercharacteristicsshallbedone
onasinglesampleonly.
i) Upto 50 5
ii) 51 to 100 10 A-2.3 CriteriaforCoofonoity
iii) 101 to 200 20
iv) 201 10300 30
v) 301 10400 40 The lot shall be considered as conforming to the
vi) 401 andabove 50 specificationifnofailureoccursinanytest.

3
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ThisIndianStandardhasbeendevelopedfrom Doc:No.ClID23(1332).
Amendments IssuedSincePublication
AmendmentNo. DateofIssue TextAffected
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