GroupstandardVW2.8.1

Issue2016-11

Class.No.:55152

Descriptors:elastomer,rubber,elastomermaterial,DOTG

Elastomers

MaterialsRequirementsandTesting

Previousissues

VW2.8.1:1960-08,1965-08,1970-04,1973-07,1974-11,1976-03,1978-10,1980-09,1989-09,1989-11,1997-06,2003-11,2007-03,2007-07,2007-12,2009-08,2009-12,2010-12,2011-02,2013-06,2014-01,2014-06,2014-09,2014-12

Changes

ThefollowingchangeshavebeenmadetoVW2.8.1:2014-12:

–

Section2.1"Basicrequirements"

and

Section2.4"MarkingasperVDA260"

completed

–

Section2.3

:lastdesignationexampleslightlymodified

–

Table1

:row"Testmedium"modifiedforgradeT

–

Table1,consec.no.17

and

Table2,consec.no.17

revised

–

Section3.7

and

Section3.8

:spellingerrorinGermancorrected

–

Section3.14

,

Section3.4.2

,and

Section3.4.3

changed

–Applicabledocumentsupdated

1Scope

Thisstandardcontainsmaterialsrequirementsandtestingforelastomermaterialsusedforpartsandtechnicalmoldedpartsinmotorvehicles(itdoesnotapplytovehicletires).

Alwaysusethelatestversionofthisstandard.

Thiselectronicallygeneratedstandardisauthenticandvalidwithoutsignature.

TheEnglishtranslationisbelievedtobeaccurate.Incaseofdiscrepancies,theGermanversionisaloneauthoritativeandcontrolling.

Page1of20

Technicalresponsibility

GQL-P/2

Peter

Schulz

Tel.:

+495361924365

GQL-P/2

Dr.Lutz

Wohlfarth

Tel.:

+495361913511

GQL-P

Dr.JipingLiu

TheStandardsdepartment

EBP/5Stefanie

Reiss

ESD

Tel.:

+495361941184

ThomasBehrens

Allrightsreserved.NopartofthisdocumentmaybeprovidedtothirdpartiesorreproducedwithoutthepriorconsentofoneoftheVolkswagenGroup’sStandardsdepartments.

?VolkswagenAktiengesellschaftVWNORM-2015-07d

Page2

VW2.8.1:2016-11

2Requirements

2.1Basicrequirements

ApprovaloffirstsupplyandchangesasperVolkswagenstandard

VW01155

Avoidanceofhazardoussubstancesasper

VW91101

.

Requirementsforsuppliersofsealingmaterialsasper

VW01153

Vulcanizationprocessfreefromdi-o-tolylguanidine(DOTG)andfreefromitscleavageproduct,o-toluidine.

Elastomerqualitiesaretestedonparts,partsections,or,inexceptionalcases,testplates(see

section3.1

).

Samplesmustalwaysbedeliveredwiththemanufacturer'squalitydesignation.

Thenumberofpartsrequiredforlaboratoryevaluationmustbeagreeduponwiththeappropriatematerialslaboratory.

Deviationsfromthisstandardmustbeindicatedindrawingsandinspectionreports.

PartswhosegradescannotbeclassifiedonthebasisofthisstandardrequirespecificTechnicalSupplySpecifications(TLs).

Recycledmaterialsmustnotbeusedasrawmaterialsinpartsthataresubjecttodynamicloadsduringdrivingoperation.

Inthiscontext,recycledmaterialmeansmixturecomponentsthatarefedbackintotherubbermix‐tureasproductsofarecyclingprocess(thermal,mechanical,andchemical)fromfullyvulcanizedrubberproducts(newpartsorusedparts,e.g.,usedtires).Examplesofthisarereclaimedrubber,regeneratedrubber,rubberpowder,andcarbonblack.

2.2Evaluationofthemeasurementresults

Therequirednumericalvaluesapplytoeachindividualmeasurement.

2.3Specificationsintechnicaldocumentation

Designationexampleforatransmission-fluid-resistant,blackhydrogenatednitrilerubber(HNBR)withincreasedrequirementsonozoneresistance(e.g.,usedinbootswithhighdynamicloads):

HNBR,VW2.8.1,E60,black,fullyhydrated(residualdoublebondproportion≤2%),ozone-resist‐

antduringbucklingload

Designationexampleforafuel-resistant,blackacrylonitrilebutadieneelastomer(NBR),withapre‐ferredhardnessof75ShoreA:

NBR,VW2.8.1–A,black

Designationexampleforatransmission-fluid-resistant,blackACMelastomerwithausagetemper‐atureofmax.+100°Candahardnessof60ShoreA:

ACM,VW2.8.1–E60,black,temperature+100°C

Designationexampleforablackethylenepropyleneterpolymerresistanttosunlight,weather,ozone,andhotairuptoatemperatureof+100°C,withreboundresilienceandahardnessof

50ShoreA:

Page3

VW2.8.1:2016-11

EPDM,VW2.8.1–G50,black,ozone-resistant,reboundresilient>50%,resistanttohotairupto+100°C

2.4Markingasper

VDA260

Fortherecyclingofvehiclesorpowertrains,thepartsaremarkedasspecifiedin

VDA260

.The

codesasper

DINISO1629

mustbeusedforthispurpose.

Elastomer/polymerblends:

Forelastomerblends,thecompositionoftheblendsmustbespecifiedindetailandalsoindicatedasper

VDA260

.

2.4.1Examplesofcodes

Thelistofcodesbelowdoesnotclaimtobeexhaustive.Rawpolymermaterialsforpartsmustal‐waysbedesignatedasspecifiedin

DINISO1629

.

ACMCopolymerconsistingofethylacrylate(orotheracrylateswithasmallfrac‐tionofamonomerthatfacilitatesvulcanization(usuallyreferredtoasacryl‐aterubber)).

AEMCopolymerconsistingofethylacrylate(orotheracrylates)andethyleneBRButadienerubber

CMChlorinatedpolyethylene

COPolychloromethyloxirane(typicallyreferredtoasepichlorohydrinrubber)CRChloroprenerubber

CSMChlorosulfonatedpolyethylene

ECOCopolymerconsistingofethyleneoxide(oxirane)andchloromethyloxirane(alsoreferredtoasepichlorohydrincopolymerorepichlorohydrinrubber)

EPDMTerpolymerconsistingofethylene,propylene,andadienewithanunsatu‐ratedpartofthedieneinthesidechain

EPMEthylene-propylenecopolymer

FKMFluorinatedrubberwithfluorine,perfluoroalkyl,orperfluoroalkoxygroupsonthepolymerchain

FVMQSiliconerubberwithmethyl,vinyl,andfluorinegroupsonthepolymerchainIIRIsobuteneisoprenerubber(typicallyreferredtoasbutylrubber)

NBRAcrylonitrilebutadieneelastomerNRNaturalrubber

SBRStyrenebutadienerubber

VMQSiliconerubberwithmethylandvinylgroupsonthepolymerchain

2.5Appearance

Thepartsmusthaveaflawlesssurfacetextureondelivery.Tackiness,inclusions,cavities,cracks,damage,etc.,arenotpermissible.

Partcolor:Seedrawing.

2.6Properties,grade

See

table1

and

table2

.

Page4

VW2.8.1:2016-11

Table1

Resistanttocontactmedium

Fuel

Oil

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

23±2

≥(125±3)

Therequiredtemperaturemustbeindicated.

23±2

Testmedium

Gasoline

Limitedresist‐

ancetogaso‐line

Dieselfuel

with20volume

percentfattyacidmethyl

ester(FAME)proportionas

per

DINEN14214

Engineoilas

per

TL52185

Hypoidgearoil

andautomatic

transmission

fluid(ATF)asperdrawingspecifications

Oilasper

drawingspe‐cifications

Limitedresist‐

ancetoengineoilasper

TL52185

Grade

A

W

T

C

E

P

U

No.

Properties

Fornoteson

testing,see

1

ThermogravimetricanalysisConstituentsin%

TestSpecification

PV3927

and/orpyrolysisgaschro‐matographymassspec‐

trometryasanidentificationtest

Aspersample

2

Densitying/cm3,

DINENISO1183-1

Aspersample

3

HardnessinShoreA

DINISO7619-1

InternationalRubberHardnessDegree(IRHD)

DINISO48

(foro-rings)

3.1

Preferredhardnessintheas-receivedcondition

Section3.2

60±5or

75±5

70±5

75±5

60±5

75±5

60±5

60±5

3.2

Changecomparedtoas-receivedcondition

3.2.1

Afterheataging,there‐

quiredtemperaturemustbeindicated

DIN53508

Section3.3

0to+3

a)

0to+3

a)

0to+3

a)

0to+3

a)

0to+3

a)

0to+3

a)

0to+3

a)

VW2.8.1:2016-11

Page5

Resistanttocontactmedium

Fuel

Oil

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

23±2

≥(125±3)

Therequiredtemperaturemustbeindicated.

23±2

Testmedium

Gasoline

Limitedresist‐

ancetogaso‐line

Dieselfuel

with20volume

percentfattyacidmethyl

ester(FAME)proportionas

per

DINEN14214

Engineoilas

per

TL52185

Hypoidgearoil

andautomatic

transmission

fluid(ATF)asperdrawingspecifications

Oilasper

drawingspe‐cifications

Limitedresist‐

ancetoengineoilasper

TL52185

Grade

A

W

T

C

E

P

U

No.

Properties

Fornoteson

testing,see

3.2.2

Afteragingincontactmedi‐um

Section3.4

+2to-12

0to-25

±4

±4

±4

±4

-4to0

Aftersubsequentdrying

Section3.5

-3to+2

0to18

±4

-

-

-

-

4

Weightchangein%

4.1

Afteragingincontactmedi‐um

Section3.4

0to15

0to45

-1to+4

-2to+6

-2to+6

-2to+6

-2to+6

4.1.1

Aftersubsequentdrying

Section3.5

-3to3

0to-20

-1to+4

-

-

-

-

5

TensilestrengthinN/mm2,

DIN53504

PV3973

(foro-rings)

Section3.6

5.1

Inas-receivedcondition

>8

>8

>8

>6

>6

>6

>6

5.2

Afterheataging,there‐

quiredtemperaturemustbeindicated

DIN53508

Section3.3

>8

a)

>8

a)

>8

a)

>6

a)

>6

a)

>6

a)

>6

a)

5.3

Afteragingincontactmedi‐um

Section3.4

>6

>4.5

>6

>6

>6

>6

>6

5.3.1

Aftersubsequentdrying

Section3.5

>8

>8

>6

-

-

-

-

VW2.8.1:2016-11

Page6

Resistanttocontactmedium

Fuel

Oil

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

23±2

≥(125±3)

Therequiredtemperaturemustbeindicated.

23±2

Testmedium

Gasoline

Limitedresist‐

ancetogaso‐line

Dieselfuel

with20volume

percentfattyacidmethyl

ester(FAME)proportionas

per

DINEN14214

Engineoilas

per

TL52185

Hypoidgearoil

andautomatic

transmission

fluid(ATF)asperdrawingspecifications

Oilasper

drawingspe‐cifications

Limitedresist‐

ancetoengineoilasper

TL52185

Grade

A

W

T

C

E

P

U

No.

Properties

Fornoteson

testing,see

6

Elongationattearin%,

DIN53504

PV3973

(foro-rings)

Section3.7

6.1

Inas-receivedcondition

>150

250

to

550

>150

250

to

550

>100

250

to

550

250

to

550

6.2

Afterheataging,

therequiredtemperaturemustbeindicated

DIN53508

Section3.3

>150

a)

200

to

550

a)

>150

200

to

550

a)

>100

200

to

550

a)

200

to

550

a)

6.3

Afteragingin

contactmedium

Section3.4

>150

>100

>150

200

to

550

>100

200

to

550

200

to

550

6.3.1

Aftersubsequentdrying

Section3.5

>150

>200

>150

-

-

-

-

7

Low-temperaturestabilityin°C

atleast

Section3.8

-35

VW2.8.1:2016-11

Page7

Resistanttocontactmedium

Fuel

Oil

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

23±2

≥(125±3)

Therequiredtemperaturemustbeindicated.

23±2

Testmedium

Gasoline

Limitedresist‐

ancetogaso‐line

Dieselfuel

with20volume

percentfattyacidmethyl

ester(FAME)proportionas

per

DINEN14214

Engineoilas

per

TL52185

Hypoidgearoil

andautomatic

transmission

fluid(ATF)asperdrawingspecifications

Oilasper

drawingspe‐cifications

Limitedresist‐

ancetoengineoilasper

TL52185

Grade

A

W

T

C

E

P

U

No.

Properties

Fornoteson

testing,see

8

GlasstransitiontemperatureTG

asper

DINENISO11357-2

Asperdrawing

9

Ozoneresistance

Section3.9

Nocracks.ForgradesotherthanG:requiredonlyif"ozone-resistant"isadditionallyspecifiedinthedrawing.

10

Lightfastness

Section3.10

Nochangescomparedtoas-receivedcondition,e.g.,discoloration,embrittlement,decomposition,cracks.ForgradesotherthanG:requiredonlyif"lightfast"isadditionallyspecifiedinthedrawing.

11

Weatherresistance

Section3.11

Nochangescomparedtoas-receivedcondition,e.g.,discoloration,embrittlement,decomposition,cracks.ForgradesotherthanG:requiredonlyif"weather-resistant"isadditionallyspecifiedinthedrawing.

12

Paintindifference

Section3.12

Nocoronaformation,noeffectsduetowashing,slightcontactdiscolorationpermissible.Requiredonlyif"paint-indifferent"isadditionallyspecifiedinthedrawing.

13

Reboundresiliencein%,

DIN53512

Requiredonlyif"reboundresilient>...%"isadditionallyspecifiedinthedrawing.

14

InsulationresistanceinMΩ,

DINEN62631-3-3

>1000.Requiredonlyif"insulation-resistant"isadditionallyspecifiedinthedrawing.

15

Self-lubricating

Section3.13

-

-

-

Requiredonlyif"self-lubricating"isadditionallyspecifiedinthedrawing.

VW2.8.1:2016-11

Page8

Resistanttocontactmedium

FueI

OiI

Testtemperaturein。C

(deviatingrequirementsasperdrawing)

23±2

≥(125±3)

Therequiredtemperaturemustbeindicated.

23±2

Testmedium

GasoIine

Limitedresist-

ancetogaso-Iine

DieseIfueI

with20voIume

percentfattyacidmethyI

ester(FAME)proportionas

per

DINEN14214

EngineoiIas

per

TL52185

HypoidgearoiI

andautomatic

transmission

fIuid(ATF)asperdrawingspecifications

OiIasper

drawingspe-cifications

Limitedresist-

ancetoengineoiIasper

TL52185

Grade

A

W

T

C

E

P

U

No.

Properties

Fornoteson

testing,see

16

Corrosionproperties,

PV3976

Grades1and2permissibIe.

17

Abrasioninmm3

PV3984

Section3.14

Othermethods

(e.g.,

DINISO4649

)

arepermissibIe,butmustbe

agreedupon

withtheappro-priateGroup

MateriaIsEngi-

neeringdepart-ment.

<200.RequiredonIyif"abrasion-resistant"isadditionaIIyspecifiedinthedrawing.

18

Emissionbehavior,

VW50180

RequiredonIyif"emissionbehaviorasperVW50180"isspecifiedinthedrawing.

9

Resistanttocontactmedium

Fuel

Oil

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

23±2

≥(125±3)

Therequiredtemperaturemustbeindicated.

23±2

Testmedium

Gasoline

Limitedresist‐

ancetogaso‐line

Dieselfuel

with20volume

percentfattyacidmethyl

ester(FAME)proportionas

per

DINEN14214

Engineoilas

per

TL52185

Hypoidgearoil

andautomatic

transmission

fluid(ATF)asperdrawingspecifications

Oilasper

drawingspe‐cifications

Limitedresist‐

ancetoengineoilasper

TL52185

Grade

A

W

T

C

E

P

U

No.

Properties

Fornoteson

testing,see

19

Plasticdeformationin%,

PV3307

O-ringsasper

PV3330

Compression40%

Requiredonlyif"plasticdeformation...h...°C<...%"isadditionallyspecifiedinthedrawing.

20

TearpropagationresistanceinN/mm

DINISO34-1

Stripspecimen

Requiredonlyif"tearpropagationresistance>...N/mm"isadditionallyspecifiedinthedrawing.

VW2.8.1:2016-11

Page

a)Deviatinglimitsmaybespecifiedinjustifiedcases.

VW2.8.1:2016-11

Page10

Table2

Resistanttocontactmedium

Grease

Coolant

Air

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

70±3

135±3

70±3

Testmedium

Calcium-lithium

greaseasper

TL745

Lithiumgreaseasper

TL735

Greaseasper

drawingspecifi‐cation

Coolantadditiveasper

TL774

Sunlightand

weatherresist‐ance

Withoutspecialproperties

Grade

K

L

M

S

G

H

No.

Properties

Fornoteson

testing,see

1

Thermogravimetricanaly‐sis,

constituentsin%

PV3927

and/orpyrolysisgaschromatographymassspectrometryasanidenti‐ficationtest

Aspersample

2

Densitying/cm3,

DINENISO1183-1

Aspersample

3

HardnessinShoreA

DINISO7619-1

InternationalRubberHardnessDegree(IRHD)

DINISO48

(foro-rings)

3.1

Preferredhardnessintheas-receivedcondition

Section3.2

60±5

75±5

60±5

60±5

60±5

65±5

3.2

Changecomparedtoas-receivedcondition

3.2.1

Afterheataging,there‐quiredtemperaturemustbeindicated

DIN53508

Section3.2

0to+3

a)

0to+3

a)

0to+3

a)

0to+3

a)

0to+3

a)

0to+3

a)

3.2.2

Afteragingincontactme‐dium

Section3.4

-4to+1

-4to+1

-4to+1

-4to5

-

-

4

Weightchangein%

VW2.8.1:2016-11

Page11

Resistanttocontactmedium

Grease

Coolant

Air

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

70±3

135±3

70±3

Testmedium

Calcium-lithium

greaseasper

TL745

Lithiumgreaseasper

TL735

Greaseasper

drawingspecifi‐cation

Coolantadditiveasper

TL774

Sunlightand

weatherresist‐ance

Withoutspecialproperties

Grade

K

L

M

S

G

H

No.

Properties

Fornoteson

testing,see

4.1

Afteragingincontactme‐dium

Section3.4

-2to8

-2to8

-2to8

-4to5

-

-

5

TensilestrengthinN/mm2,

DIN53504

PV3973

(foro-rings)

Section3.6

5.1

Inas-receivedcondition

>6

>6

>6

>7

>6

>6

5.2

Afterheataging;there‐quiredtemperaturemustbeindicated

DIN53508

Section3.3

>8

a)

>8

a)

>6

a)

>7

a)

>6

a)

>6

a)

5.3

Afteragingincontactme‐dium

Section3.4

>6

>6

>6

>6

-

-

6

Elongationattearin%,

DIN53504

PV3973

(foro-rings)

Section3.7

6.1

Inas-receivedcondition

250

to

550

250

to

550

250

to

550

250

to

550

250

to

550

250

to

550

6.2

Afterheataging,there‐quiredtemperaturemustbeindicated

DIN53508

Section3.3

200

to

550

a)

200

to

550

a)

200

to

550

a)

200

to

550

a)

200

to

550

a)

200

to

550

a)

VW2.8.1:2016-11

Page12

Resistanttocontactmedium

Grease

Coolant

Air

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

70±3

135±3

70±3

Testmedium

Calcium-lithium

greaseasper

TL745

Lithiumgreaseasper

TL735

Greaseasper

drawingspecifi‐cation

Coolantadditiveasper

TL774

Sunlightand

weatherresist‐ance

Withoutspecialproperties

Grade

K

L

M

S

G

H

No.

Properties

Fornoteson

testing,see

6.3

Afteraging

incontactmedium

Section3.4

200

to

550

200

to

550

200

to

550

200

to

550

-

-

7

Low-temperaturestabilityin°C

atleast

Section3.8

-35

8

Glasstransitiontempera‐

tureTG

asper

DINENISO11357-2

Asperdrawing

9

Ozoneresistance

Section3.9

Nocracks.ForgradesotherthanG:requiredonlyif"ozone-resistant"isadditionallyspecifiedinthedrawing.

10

Lightfastness

Section3.10

Nochangescomparedtoas-receivedcondition,e.g.,discoloration,embrittlement,decomposition,cracks.ForgradesotherthanG:requiredonlyif"lightfast"isadditionallyspecifiedinthedrawing.

11

Weatherresistance

Section3.11

Nochangescomparedtoas-receivedcondition,e.g.,discoloration,embrittlement,decomposition,cracks.ForgradesotherthanG:requiredonlyif"weather-resistant"isadditionallyspecifiedinthedrawing.

12

Paintindifference

Section3.12

Nochangesascomparedtoas-receivedcondition;slightcontactdiscolorationpermissible.Onlyrequiredif"paint-indifferent"isadditionallyspecifiedinthedrawing.

13

Reboundresiliencein%,

DIN53512

Requiredonlyif"reboundresilient>...%"isadditionallyspecifiedinthedrawing.

14

InsulationresistanceinMΩ,

DINEN62631-3-3

>1000.Requiredonlyif"insulation-resistant"isadditionallyspecifiedinthedrawing.

15

Self-lubricating

Section3.13

Requiredonlyif"self-lubricating"isadditionallyspecifiedinthedrawing.

13

Resistanttocontactmedium

Grease

CooIant

Air

Testtemperaturein。C

(deviatingrequirementsasperdrawing)

70±3

135±3

70±3

Testmedium

CaIcium-Iithium

greaseasper

TL745

Lithiumgreaseasper

TL735

Greaseasper

drawingspecifi-cation

CooIantadditiveasper

TL774

SunIightand

weatherresist-ance

WithoutspeciaIproperties

Grade

K

L

M

S

G

H

No.

Properties

Fornoteson

testing,see

16

Corrosionproperties,

PV3976

Grades1and2permissibIe.

17

Abrasioninmm3

PV3984

Section3.14

Othermeth-

ods(e.g.,

DINISO4649

)arepermissi-

bIe,butmustbeagreed

uponwiththeappropriate

GroupMateri-

aIsEngineer-ingdepart-

ment.

<200.RequiredonIyif"abrasion-resistant"isadditionaIIyspecifiedinthedrawing.

18

Emissionbehavior,

VW50180

RequiredonIyif"emissionbehaviorasperVW50180"isspecifiedinthedrawing.

Page

VW2.8.1:2016-11

VW2.8.1:2016-11

Page14

Resistanttocontactmedium

Grease

Coolant

Air

Testtemperaturein°C

(deviatingrequirementsasperdrawing)

70±3

135±3

70±3

Testmedium

Calcium-lithium

greaseasper

TL745

Lithiumgreaseasper

TL735

Greaseasper

drawingspecifi‐cation

Coolantadditiveasper

TL774

Sunlightand

weatherresist‐ance

Withoutspecialproperties

Grade

K

L

M

S

G

H

No.

Properties

Fornoteson

testing,see

19

Plasticdeformationin%,

PV3307

O-ringsasper

PV3330

Compression40%

Requiredonlyif"plasticdeformation...h...°C<...%"isadditionallyspecifiedinthedrawing.

20

Tearpropagationresist‐anceinN/mm

DINISO34-1

Stripspecimen

Requiredonlyif"tearpropagationresistance>...N/mm"isadditionallyspecifiedinthedrawing.

a)Deviatinglimitsmaybespecifiedinjustifiedcases.

Page15

VW2.8.1:2016-11

3Notesontesting

ForaginginfueIs,oiIs,andgreases,thevoIumemustbeequaIto(80±5)timesthevoIumeofthetestspecimen.TestvesseIs(andaIsospecimenhoIderswhenaginginfIuids)asper

PV3323

mustbeused.

UnIessotherwiseagreed,thetoIerancesspecifiedin

DINISO23529

appIytotheagingtimes.

UnIessotherwisespecified,measurementsmustbecarriedout30minafterremovingthespeci-

menfromthetestmedium.ThespecimensmustbecIeanedwithaIint-freecIothimmediateIyafterremovaI.

Testconditionsdeviatingfromthisstandardmustbespecifiedindrawingsandinspectionreports.

3.1Specimen

TestsareperformedonS3Adumb-beIIspecimensasper

DINISO7619-1

.Thesespecimens

mustbetakenfromthefinishedparts.Forcertainfinishedpartdimensions(e.g.,radiaIshaftseaIs),S3dumb-beIIspecimensmaybeusedasanaIternative.InexceptionaIcases,ifstandardtest

specimenscannotbeextractedfromthefinishedpartsbymeansof,forexampIe,abandknifespIit-tingmachine,testpIates(thickness2mm)maybeused.

3.2Preferredhardness

Whereadeviationfromthepreferredhardnessisnecessary,theseIectedhardnessmustbeindi-catedfoIIowingthegradedesignation,e.g.,E60.ThetoIeranceinsuchcasesisaIways

±5ShoreA.

3.3Heataging

Agingfor94hinaforced-airovenasper

DIN53508

.Injustifiedcases,otheragingtimesmaybeagreedupon.MeasurementsarecarriedoutaftercooIingtoroomtemperature,(23±2)。C.

3.4Agingincontactmedia

Theconditionsspecifiedin

section3.4.1

to

section3.4.5

appIytoagingincontactmedia.

3.4.1GasoIine

ThefoIIowingtestfIuidsareused:

-TestfIuidasper

DIN51604-2

(FAMB)

Composition:

84.5voIumepercentFAMtestfIuidasper

DIN51604-1

(FAMA)

15.0voIumepercentmethanoI

0.5voIumepercentwater

-E85fueI

Composition:

84voIumepercenthighestgradeethanoIasperGermanPharmacopoeia(DAB)7

16voIumepercentFAMtestfIuidasper

DIN51604-1

(FAMA)OthertestfIuidsmaybeusedifrequired(deviationsasperdrawing).

Page16

VW2.8.1:2016-11

Agingfor168h(otheragingtimes,e.g.,48h,asperdrawingspecification)atroomtemperature

(23±2)°C.Thespecimensaredabbedoffwithfilterpaper(e.g.,blackband)afteraging.Theeval‐uationsarecarriedout1minafterwards.Injustifiedcases,evaluationmayalsobegin15minafterremoval,butthisissubjecttoagreement.

3.4.2Dieselfuel,fattyacidmethylester(FAME)

Thefollowingtestcompositionmustbeusedforagingofthespecimensindieselfuel:

80volumepercentstandarddieselLiquidFasper

DINISO1817

;

20volumepercentFAMEasper

DINEN14214

.Soymethylester(SME)mustbeusedastheFAMEcomponent.

Injustifiedcases,theuseofthefollowingtestmixtureisalsopermissibleforagingindieselfuel:

93volumepercentstandarddieselLiquidFasper

DINISO1817

;

7volumepercentFAMEasper

DINEN14214

withrapeseedoilmethylester(RME)astheFAMEcomponent.

Testdurationsandtemperaturesmustbeagreedupon.

Agingatanelevatedtemperatureisperformedusingarefluxcondenser.Aftertheagingtimeends,thespecimensmustbecleanedwithalint-freecloth.Specimensthathavebeenagedataneleva‐tedtemperaturecanbeleftinthetestfluidtocooldowntotheambienttemperature.Theevalua‐

tionsarecarriedout1minafterthespecimensareremovedfromthemedium.Injustifiedcases,otheragingtimesandtesttemperaturescanbeagreedupon(e.g.,48hat23°C).

3.4.3Oil

Agingtime:48hand96h.ForgradeU,aginginoilisperformedfor24hat(23±2)°C.

Foragingofthespecimensinengineoil,referenceengineoilasper

TL52185

mustbeusedastestfluid.Othertestoilsmaybeused,butaresubjecttoagreement.

3.4.4Grease

Agingtime48h.

3.4.5Coolantadditive

S3Adumb-bellspecimensasper

DIN53504

areagedintestfluidconsistingof50partsbyvol‐

umedeionizedwater,and50partsbyvolumecoolantadditive,asperthelatestversionof

TL774

at+135°Cinanautoclave.Thefluidvolumemustbe150to180timesthespecimenvolume.Afterthis,thespecimensarecooleddownto(23±2)°Cinthetestfluidwithin2handmeasured.

Agingtime:94h.Injustifiedcases,otheragingtimesmaybeagreedupon.

3.5Drying

Thespecimensarepre-dried(2to4)hatroomtemperature.Theyarethendriedfor22hat+85°Cinanaturalconvectionovenasper

DIN53508

.Thespecimensmustbestoredsuchthatthereis

completecirculationofairaroundthem.

Page17VW2.8.1:2016-11

3.6Tensilestrength

Thetensilestrengthoftheageddumb-bellspecimenmustbebasedonitscross-sectionbefore

aging.Fortestsperformedono-rings,theringthicknessisdeterminedusingareferenceringtakenfromthesamplebatch(see

PV3973

).

3.7Elongationattear

Elongationattearoftheageddumb-bellspecimenisbasedonitscondi