IS 15776: Polyurethane (PU) coated leather

2008·3.7 MB·English

by  Bureau of Indian Standards

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IS 15776 (2008): Polyurethane (PU) coated leather [CHD 17:
Leather, Tanning Materials and Allied Products]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
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IS 15776 : 2008

Indian Standard
POLYURETHANE (PU) COATED
LEATHER - SPECIFICATION
ICS 25.220.01;59.140.30;83.080.10
© BIS2008
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

April 2008 PriceGroup3
Leather,TanningMaterials andAllied Products Sectional Committee. CHD 17
FOREWORD
This IndianStandard was adopted by the Bureau ofIndian Standards, after the draft finalized by the Leather,
TanningMaterialsandAlliedProductsSectionalCommitteehadbeenapprovedbytheChemicalDivisionCouncil.
Polyurethane (PU) coated leather is used widely in the manufacture of various leather goods items, leather
footwearandleathergarmentsinviewofuniqueappearance.Additionally,leathereven withseveregraindamage
cangetupgraded bypolyurethanecoating wherein the surfacedefects get masked.
Polyurethane(PU)coatedleathersalsofindastrongdemandinthefashion industryand therebyhaveinternational
demand.
Thecomposition oftheCommitteeresponsibleforformulation ofthisstandard isgiven inAnnex D.
Forthepurpose ofdeciding whether aparticularrequirementofthis standard iscomplied with, the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with
IS2:1960'Rulesforroundingoffnumerical values(revised)'.The numberofsignificantplaces retainedinthe
roundedoffvalueshould be thesame asthatofthespecified value inthis standard.
IS15776:2008
Indian Standard
POLYURETHANE (PU) COATED
LEATHER - SPECIFICATION
1SCOPE leather shall be finished with a film of polyurethane
and shall have a high gloss as agreed to between the
This standard prescribes requirements. methods of
purchaserand the supplier.
samplingandtestforpolyurethane (PU)coatedleather.
4.2Physical and ChemicalRequirements
2REFERENCES
The leather shall also conform to the requirements
The following standards contain provisions, which
given inTable I, when tested inaccordance with the
through reference inthis textconstitute provisionsof
methodsprescribed incol 4ofTable I.
thisstandard.At the timeofpublication, the editions
indicated were valid. All standards are subject to 4.3Hazardous Chemicals
revision and parties to agreements based on this
standard are encouraged to investigate the possibility The leather shall also conform to the requirements
of applying the most recent editions of the standards given inTable 2. when tested in accordance with the
indicated below: methodsprescribed incol4ofTable 2.
ISNo. TItle 5MARKING
576 : 1989 Leather- Glacekidforshoe uppers 5.1 The leather shall be legibly marked on the flesh
- Specification. sideofeach piece with the areainsquaredecimeters,
582 :1970 Method ofchemicaltestingofleather with the following details:
(first revisions
a) Batch No..
1070: 1992 Reagentgrade water (third revision}
b) Date offinishing,and
1640: 1960 Glossary ofterms relating to hides,
skins and leather(first revisions c) Identificationmarkorsourceofmanufacture.
5868 : 1983 Methodofsamplingforleather(first
5.2 In addition. the leather when packed inabundle,
revisions
shall be marked with the total area ofthe leather in
5914 : 1970 Methodsofphysicaltestingofleather
thatbundleand numberoftotal piecesofleatherinthe
6191 : 1971 Methods of microbiological, colour
same.
fastness and microscopical tests for
leather 5.3HISCertificationMarking
12659 : 1989 Method of test for measurement of
The productmayalso bemarked withStandardMark.
thickness of surface coating on
leather 5.3.1The useoftheStandardMarkisgovernedbythe
12718: 1989 Leatherforgarments- Performance provisions of Bureau ofIndian Standards Act. 1986
requirements and the Rules and Regulations made thereunder.The
14575: 1999 Determinationofpentachlorophenol details of conditions under which the licence for the
(PCP)inleather-Methodoftext useofStandardMark maybegrantedtomanufacturers
14898: 2001 ECO criteria for finished leather
or producers may be obtained from the Bureau of
Specification
Indian Standards.
3TERMINOLOGY
6PACKING
Forthe purposeofthis standard the definitionsgiven
The leathershall be packed a~ agreed to between the
inIS 1640shall apply.
purchaserand the supplier.
4REQUIREMENTS
7SAMPLING
4.1General Representativesamplesofthe material shall bedrawn
and tested for theirconformity with therequirements
The leather shall be full-chrome or semi-chrome/
of this standard in accordance with the method of
chromeretannedwith vegetable tannins/syntans.The
samplingprescribed inIS5868.
grainmaybesnuffed,ifrequired.Thegrain sideofth e
IS15776:2008
Table 1Physical Requirementsfor PUCoated Leather
(Clause 4.2)
51No. Chuacteristic Requirement MethodofTest,Refto
--- .....
IS582 IS5914 IS6191 IS2659
(\) (2) (3) (4) (5) (6) (7)
i) PUfimthickness, microns.Min 15 \S 12659
ii) Tensilestrength.MPa,Min 16 LP6
iii) Elongationatbreak, percent,Max 80 LP6
iv) Doubleholestitchtearstrength.Nzcm,Min 800 LP8
v) Tearstrength. Nzrnm,Min 300 LP7
vi) Flexuralendurance.Flexes.Min:
a) Dry 20000 LPI9
b) Wet 10000 LP19
vii) Fastnesstorubbingafter I024revolutions.Min
Greyscalerating:
a) Dry 4 LF9
b) Wet 4 LF9
viii) Finishadhesion.Nrm,dry.Min 250 Annex Dof
IS 12718
ix) Distentionatgraincrack,rnm,Min 7 Annex Aof
(Thesoundofcrack istobeobserved IS576
insteadofvisualobservanceofcrack)
x) Coldcrackresistance Nocrackat-IO"C AnnexEof
IS127\8
xi) Acetone peeltest Topassthetest Annex Aof
this standard
xii) Hotscrapetest,at250"C Topassthetest Annex Bof
thisstandard
xiii) Toggletest Topass thetest Annex Cof
thisstandard
xiv) Solventextractablesubstance,percentby 3to8 LC 4
mass,percent')
xv) Chromium(asCr20J),percentbymass,Mini) 2.0 LC 10
xvi) Watersolubles,percentbymass.Max') 3.5 LC 6
xvii) pHofaqueousextract, Min 3.5 LC 18
xviii) Differentialfigure Notgreaterthan LC 18
0.7
')Tobecalculatedonzeropercentmoisturebasis.
Table 2Freedom from HazardousChemicals
(Clause4.3)
5\No. Characteristic Requirement MethodofTest,Refto
(I) (2) (3) (4)
i) Formaldehyde,rng/kg,Max 150 LC:3ofIS 14898
ii) Pentachlorophenol.mg/kg,Max 5 IS14575
iii) Coupledaminesreleasedfromazodyes(sumparameters),mglkg,Max 30 LC:4ofIS 14898
iv) Hexavalentchromium.mg/kg,Max 3 LC:2ofIS14898

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IS 15776 :2008
ANNEXA
(Table 1)
ACETONEPEELTEST
A-I PRINCIPLE the film with the help ofa knife. Gently take offthe
film from the leather and peel the film up to the dry
In order to check the bond strength between the PU
sectionholdingthesamplebetweenthefingers.Repeat
film and the leather. acetone is applied on the flesh
theentire procedurefor thesecondsample. Ifthefilm
sideof theleatherand thefilm is peeled off.
isdetachedeasilythesample isconsideredtobefailing.
A-2PROCEDURE
A·3EXPRESSIONOFRESULTS
Cuttwotestspecimenswith 100mmx 10mmsizeon
Based on the visual examination, the results shall be
both directions. Apply I ml of acetone on the flesh
expressed ineitherofthe following twoterms:
sideatoneend ofthe testspecimen.Place the leather
onatable with PUcoated side up. Leaveitfor5min. a) Passes thetest, and
Make a light vertical cut on acetone applied area of b) Fails the test.
ANNEXB
(Table 1)
HOTSCRAPETEST
B-1PRINCIPLE withthe lowersurfaceofthebitandislarger
than the lowersurfaceof thebit.
The test isintendedtodetermine the resistanceofthe
e) A removable thermally insulated support to
finish surface to mechanical damage after short-term
hold the bitclearof theplatform.
contact withahot surface.
t) Ameansforraising thebitclearofthesupport
B-2APPARATUSAND MATERIALS and bringingitinto uniformcontact with the
testspecimenmountedontheplatform under
B-2.1 Heat resistance tester having the following
apressureof20 ±2 kPa.
features:
B-2.2 Scraping Tool - A blade of dimensions as
a) Acopperbithaving amass of2±0.5 Nwith
shown inFig. I.
acircularsurface area of650 ±50 mrn?and
provisionto measure temperature. B-2.3 Timer.to measurethe time tothe nearest Is.
b) A metal heating block with a mass of
5.3 ±0.5 N, fitted around the verticalsides B-3PROCEDURE
ofthe copper bit with provision ofa heater a) Cut a test specimen large enough to handle
which can be controlled to heat the lower for the test.
surfaceofthe bit toany desired temperature
b) Switch on the heating source of the test
uptoamaximumof 250°e.
machineandwait untilthetemperatureinthe
c) A temperature measuring device to measure indicatorisslightlyabove 250°Candswitch
the temperature up to 250°C to the nearest offthe machine.
2°e.
c) Place the leather piece on the platform with
d) Alowermetalplatform, whichisself-aligning finishsidefacing upand placeanaluminium

3
IS 15776:2008
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ENLARGEDDETAIL
OFSCRAPERTIP
All dimensionsinmillimetres.
FIG. 1SCRAPING TOOL
sheet/foilover theleather. force by hand. Repeat this scraping
NOTE - Aluminium sheet is used to avoid any procedureattwo moreplacesadjacenttothe
stickingofthe film tothe heating bit. scraped surface.
d) When thetemperaturereaches 250°C, lower g) Entiretestshouldbeconductedquicklybefore
the lever so that the heating bit comes in thesurfacegetscooled.
contactwith the finish on the leather.
B-4REPORT
e) After30± 1s,raise theplatformandquickly
remove the leather from the platform and
Based on the visual examination, the results shall be
place iton the table.
expressedineitherofthe following two terms:
f) Immediately scrape the finish surface with
a) Passes the test, and
one stroke using the scraping tool in one
direction approximately applying 9 ± 1 N b) Failsthe test.

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IS 15776:2008
ANNEXC
(Table 1)
TOGGLETEST
C-IPRINCIPLE thehelpofanailatregularintervals.Stretchtheleather
using toggleclips and keep thestretchedleatherinan
In order to check the property for resistance to cut
oven maintained at 100± 2°C for 24 h. Remove the
growth of the PU film, the patent leatherisaged at a
stretchedleatherfrom theovenafter24handcoolitat
higher temperature for a certain period and it is then
room temperature.
visuallyexamined.
C-4 EXPRESSIONOFRESULT
C-2APPARATUS
Based on the visual examination of thespecimenthe
C-2.1 ToggleBoard result isexpressed ineitherofthe followingterms:
C-2.2 Toggle Clips a) Passes theTest- Incase thereisnocrackor
C-2.3 AirOven,maintainedat 100±2°C. teargrowthorchangeincolourofthePUfilm,
and
C-3 PROCEDURE b) Fails the Test- In case there is acrack or
tear growth or change in colour of the PU
CutI()()mmx 15mmstripoftestpiecefromthesample
film.
of PU leather. Make few holes on the specimenwith
ANNEXD
(Foreword)
COMMITTEECOMPOSITION
Leather,TanningMaterialsandAllied ProductsSectionalCommittee,CHD 17
Organization Representativeis)
Central Leather Research Institute, Chennai DIRECTOR (Chairman)
DR S. SAOL'LLA (Alternate I)
DR C. ML'RALIOHARAN (Alternate II)
All India Skins & Hide Tanners and Merchants Association. Chennai SHRI M. SRINIVAS
SHRI N. M. ZACHARIAH (Alternate)
A V Thomas Leather & Allied Products Pvt Ltd. Chennai SHRI HABIB HUSSAIN
SHRI K. MANIV~NNAN (Alternate)
BASFIndia Ltd. Murnbai SHRI P.R. CHAUOHARI
DR S. A. NAOGOUOA(Alternate)
Bata India Ltd. Kolkata SHRJ S. R. RAHA
SHRI S. MOITRA (Alternare)
Central FootwearTraining Insutute, Chennai SHRI S. N. GANGULY
SHRI S. CHAKRABORTY (Alternate)
Central Pollution Control Board, Delhi SHRI T.VENUGOPAL
SHRJNAYAGGARWAL (Alternate)
College of LeatherTechnology. Kolkata SHRI BUODHAOEV CHAITERJEE
PRoFSWAPAN KUMAR BASU (Alternate)
ConsumerFederation of India. New Delhi REPRESENTATIVE
Council for LeatherExports. Chennai SHRI M.M. HASHIM
DRZACKRIA SAIT(Alternate)
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