Tiêu chuẩn iso 04642 2 2015

© ISO 2015 Rubber and plastics hoses, non collapsible, for fire fighting service — Part 2 Semi rigid hoses (and hose assemblies) for pumps and vehicles Tuyaux en caoutchouc et en plastique, non aplati[.]

Rubber and plastics hoses,

non-c ol apsible, for fir e-fighting servic e —

Part 2:

Tu a x en ca utch uc et en plastique, n n a latissable s, p ur la lute

COPYRIGHT PROTECTED DOCUMENT

© ISO 201 , P blshed in Sw itz rlan

A ll rig hts r eserved Unles otherw ise spe ified, nopar of this p blc tion ma y be r eprod c d or utilz d otherwise in an form

or b an me ns, ele tr onic or me hanic l, inclu in p oto opying , or posin on the internet or an intr anet , without prior

written permis ion Permis ion c n be r eq esed fr om either ISO at the ad r es below or ISO’s member bod y in the c u ty of

F r eword v

Introduction vi

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms and definitions 2

4 Clas ification 2

4.1 General 2

4.2 Clas ification b types(hoseconstruction) 2

4.3 Clas ification b clas (mate ialsfor lning an co e ) 2

4.4 Clas ification b categ ory 3

5 Dimensions, toleranc es and max imum mas 3

5.1 Inside diamete an ma imum mas 3

5.2 Leng th an toler anc s on leng th 3

5.3 Conc ntricity .4

6 Perfor manc e requir ements of finished hose 4

6.1 Hydr ostatic r eq ir ements 4

6.1.1 Deformation u de max imum wor king pr es ure 4

6.1.2 Deformation u de pr oof pres ur e 4

6.1.3 Minimum burs pr es ur e 4

6.1.4 K in pr es ure 4

6.2 A dhesion 4

6.3 A cc lerated ag eing 5

6.4 A brasion resis anc .5

6.4.1 General 5

6.4.2 A brasion resis anc of clas 5 an clas 6 hoses 5

6.4.3 A brasion resis anc of clas es 1, 2, 3 and 4 hoses 5

6.5 L w temperatur e flexibi ty 5

6.6 Hot surfac r esis anc 5

6.7 Ozone r esis anc

6 6.8 Bending and c ush resis anc 6

6.9 UV r esis anc (xenon ar c lamp) 6

6.1 L s in mas on heating 6

6.1 Deformation u de c ushing ( ype Conly) 6

6.1 Hose as embles 6

7 F requency of testing 6

8 T ype tests

7 9 Test rep r t 7

10 Rec ommendatio for packag ing and storag e 7

11 Mar king 7

A nne x A (normative) Kink pres ur e test 8

A nne x B (normative) Ac c elerated ag eing test 9

A nne x C (normative) Sur fac e abrasion resistanc e test 10

A nne x D (normative) Point abrasio resistanc e test 12

A nne x E (normative) Hot surfac e r esistanc e test 15

A nne x F (normative)Bending and cr ush r esistanc e test 20

A nne x G (normative) Deformation under c ushing test 22

A nne x H (normative) Adhesio test (lay-flat fire-fighting hoses) 24

A nne x I (normative) Test for fir e-fighting hose as embles 26

A nne x J (normative) T ype test and routine test

A nne x K (informative) Prod ction tests 28

Biblog raph y 29

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b dies (ISO membe b dies) The work of pr paring Int ernational Stan ards is normal y car ied out

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ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www.iso.org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detai s of

any p t ent right identified d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www.iso.org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

F or an ex lanation on the meaning of ISO spe ific t erms and ex r s ions r lat ed t o conformity

as es ment, as wel as information a out ISO’s adhe enc t o the WTO principles in the Te h ical

Bar ie s t o Trade (TBT) se the fol owing URL: F or word - Sup lementary information

The committ ee r sp nsible for this document is ISO/TC 45, R ub e a d rub e produc ts , Subcommitt ee

SC 1, Ru be  a d plas tic s h s es a d h s e as sembles

This se on edition canc ls and r plac s the firs edition (ISO 4642- 2:2 0 ), of w hich it cons itut es a

minor r vision

ISO 4642 consis s of the fol owing p rt , un e theg ene al title R ub e  a d plas tic s h s es , n n-c ola s ible, 

fr fire -fig tin  s er v ic e:

— Part 1: Semirigid h ses fr fi xed sys tems

— Part 2 : Semirigid h s es (a d h se as s emblies) fr p mps a d vehicles

This p rt of ISO 4642 is mainly conc rned with f ir se vic semi-rigid del ve y hoses an incorporat es

those hoses used man aly t o control an extinguish f ir s

Rubber and plastics hoses, non-c ol apsible, for

This p rt of ISO 4642 spe ifies the r q ir ment an t es methods for semi-rigid r el hoses for use on

fir -fighting vehicles an traie pumps The hoses ar int en ed for use at a ma imum working pr s ur

of 1,5 MPa for normal pr s ur hoses (cat eg ory I) an 4,0 MPa for high pr s ur hoses (cat eg ory I ) The

hoses ar furthe subdivided int o ty es an clas es ( e Cla use 4)

This p rt of ISO 4642 a ples t o delve y hoses for fir -fighting purp ses int en ed for use at a minimum

ambient t empe atur of − 20 °C

Hoses conforming t o this p rt of ISO 4642 ar int en ed t o be used with f ir hose couplngs conforming

t o the r lev nt national s an ards coupl ngs

R eq ir ment ar also given for hose as embles ( e 6.1 ) w he e these ar fitt ed b the hose

man factur r

NOTE 1 Hoses for use at t emperatures lower than − 0 °C can b su plied by a re ment b tween the

man facturer an p r haser

NOTE 2 Al pres ures are e pres ed in me apas als where 1MPa = 1 b r

2 Normati ve referenc es

The folowing document , in w hole or in p rt, ar normatively r fe enc d in this document an ar

in ispensa le for it a pl cation F or dat ed r fe enc s, only the edition cit ed a ples F or un at ed

r fe enc s, the lat es edition of the r fe enc d document ( inclu ing any amen ment )a ples

ISO 176:2 0 , Plas tic s — Dete min tio  o los s o plas tic i ze s — Ac ti vated c arb n meth d

ISO 1 8, R ub e , lc ani zed or the mo las tic  — Ac c ele ated a ein  a d heat r s i s ta c e tes ts

ISO 1 0 , R ub e  a d plas tic s h ses — Hos e s i zes, minimum a d  max imum ins ide diamete s, a d tole a c es 

o  c ut-to-en th h s es

ISO 140 , Ru be  a d plas tic s h ses a d h s e as s embles — Hydros tatic tes tin

ISO 46 1:2 0 , R ub e  a d plas tic s h s es a d h s e as s emblies — Meth ds o meas ur ment o the 

dimens io s o h s es a d the len ths  o h s e as semblies

ISO 73 6:2 0 , R ub e  a d plas tic s h s es — As ses s ment o o o e r si s ta c e u de  s tatic c onditio s

ISO 80 3:2 0 , R ub e  a d plas tic s h s es — Dete min tio  o  adhes i on bet we n c omp nent

ISO 83 0, R ub e  a d plas tic s h ses a d h s e as sembles — Voca ular y

ISO 1 6 19- 2:2 1 , R ub e  a d plas tic s h s es a d tu in    Meas ur ment o flex ibi t y a d s tifnes s — 

Part 2 : B endin  tes ts  at s ub-ambient tempe atur s

3 Ter ms and definitions

F or the purp sesof this document, the t erms an def initions given in ISO 8 3 an the folowing a ply

3.1

semi rigid hose

hose that maintains it rou d c os -se tion even w hen unpr s uriz d

4 Clas ification

Al ty es an clas es of hoseshal be so flexible that they can be roled an kept on a drum of minimum

diamet er 2 0 mm for 1 mm inside diamet er, 1 mm inside diamet er an 2 mm inside diamet er hose

an of minimum diamet er 2 0 mm for 3 mm inside diamet er hose

Hoses shal be one of two cat eg ories dis inguished b the ma imum working pr s ur Each hose shal

be furthe divided int o one of thr e ty es dis inguished b it cons ruction, an then int o six clas es

dis inguished b the mat erials used for lning an co e

NOTE The hose can b coloured by a re ment b tween the p r haser an the man facturer

4.2 Clas ification by types (hose c onstr uction)

4.2.1 T ype A hoses shal consis of:

a) a seamles rub e or plas ics l ning;

b) a t extie spiral or braided r infor emen

c) a rub e or plas ics co e

4.2.2 T ype B hoses shal consis of:

a) a seamles rub e or plas ics l ning;

b) a cir ular woven t extie r infor ement with a rigid spiral hel x;

c) an u co e ed or rub e or plas ics co e

4.2.3 T ype C hoses shal consis of:

a) a seamles rub e or plas ics l ning;

b) any suita le r infor emen

c) a rub e or plas ics co e

NOTE While the construction of ty e A an ty e C hoses can b similar or even identical, the performance

req irements difer for the folowing: bur t an pro f pres ure,ad esion, hot surface resistance, c ush resistance

4.3 Clas ification by clas (materials for l ning and c over)

The hose ty es shal be furthe subdivided int o six clas es depen ent on the mat erials used in their

cons ruction, in ac ordanc with Ta le1

Table 1 — Clas es and materials

4.4 Clas ification by categ or y

Al hoses shal be divided int o two cat eg ories depen ent on the ma imum working pr s ur , in

E AMP LE A ty e C hose, construct ed with a rub er lining an rub er over an w hich has a ma imum working

pres ure of 4,0MPa, a pro f pres ure of 8,0 MPa an a minimum bur t pres ure of 1 ,0MPa is clas ified as I /C/1

5 Dimensions, toleranc es and max imum mas

5.1 Inside diameter and max imum mas

The inside diamet er of the hose and t ole anc s, w hen measur d in ac ordanc with ISO 46 1, using any

suita le method s at ed in ISO 46 1:2 0 , Clause 4, shal conform t o the r q ir ment given in Ta le 3

The mas pe metr length ofthe hose shal be in ac ordanc with Ta le 3

Table 3— Inside diameter, tolerances on inside diameter and maximum mas per unit length

Inside diamet er Tole anc s for inside diamet er Mas pe u it length

5.2 Leng th and toleranc es on leng th

The t otal length of hose sup led shal be in ac ordanc with the pur hase ’s r q ir ment an shal be

s at ed in metr s Tole anc on length shal be in ac ordanc with ISO 1 0

5.3 Conc entr icity

When t est ed in ac ordanc with ISO 46 1:2 0 , 8.3 (Method 2), the v riation from conc ntricity

measur d between inside an out ide diamet ers shal not ex ce d the folowing v lues:

Ty es A an C 1,5 mm

6 P erformanc e requirements offinished hose

6.1 Hy r ostatic requirements

6.1.1 Defor matio unde max imum wor king pres ure

The dimensional s a i ity of the hose, w hen t est ed in ac ordanc with ISO 140 , shal conform t o the

r q ir ment given in Ta le 4 The length of the t es pie e shal be 1 m

F or cat eg ory I hoses, the initial t es pr s ur shal be 0,0 MPa an the final t es pr s ur shal be

1,5 MPa F or cat eg ory I hoses, the initial t es pr s ur shal be 0,0 MPa an the f inal t es pr s ur

Table 4 — Chang e in length and external diameter

Tole anc s for ty es A, B an C

%

NOTE Hose with a lower ma imum chang in length can b a re d b tween the p r haser an man facturer

6.1.2 Defor matio unde pr oof pres ur e

A pro f pr s ur hold t es shal be car ied out on thr e hose lengths each of 1 m in ac ordanc with

ISO 140 The pro f pr s ur shal be as given in Ta le 2 an , on ex mination d ring the t es , the t es

pie esshal not show any evidenc of leakag e, c acking, a rupt dist ortion or othe signs of faiur

6.1.3 Minimum b r st pr es ur e

A burs pr s ur t es shal be car ied out in ac ordanc with ISO 140 on the thr et es pie es used for

the deformation u de pro f pr s ur t es , unti the hose burs s

None of the t es pie es shal burs at a pr s ur les than that given in Ta le 2

6.1.4 Kink pres ur e

When t est ed in ac ordanc with Annex A, the t es pie e shal neithe burs nor show any visible signs of

defe t befor or aft er pr s urizing at 1,5MPa for cat eg ory I hoses an at 4,0 MPa for cat eg ory I hoses

When t est ed in ac ordanc with An ex H the ad esion betwe n al component shal be not les than

1,5 kN / m for ty e A hoses, 1,0 kN /m for ty e B hoses and 2,0 kN /m for ty e C hoses

6.3 Ac c elerated ag eing

When t est ed in ac ordanc with An ex B, the thr e t es pie essubje t ed t o the burs pr s ur t es shal

conform t o the r q ir ment of 6.1.3 The mean of the burs pr s ur t es r sult shal not de r ase b

mor than 2 % from the initial mean burs v lue det ermined from the r sult o tained in 6.1.3

The r sultant adhesion of the fourth t es pie e shal be in ac ordanc with the r q ir ment of 6.2

NOTE T ere is no limitation on the inc e se in the values of these properties

6.4 Abrasion resistanc e

6.4.1 General

Abrasion t es s ar spe ific t o dife ent hose cons ructions an / r mat erials Two proc d r s with

dife ent v lues ar the efor spe ified he e t o a oid u fair disc imination In ad ition, it is imp rtant

t o not e that the r q ir ment , r v lutions as given in Ta le 5 an double s rokes as given in Ta le 6,

cannot be cor elat ed

6.4.2 A brasio resistanc e of clas 5 and clas 6 h ses

When tested in a ccordanc with An ex C an using the n umbe of r v lutions given in Ta le 5, at leas four

of the five tes pie es shal not burs on being subje ted to the normal wor king pr s ur given in Ta le 2

Table 5 — Abrasio resistance of unco ered hose (clas es 5 and 6)

Inside diamet er

Numbe of r v lutions

mm

6.4.3 A brasio resistanc e of clas es 1, 2, 3and 4 hoses

When t est ed in ac ordanc with An ex D, the a e ag e n mbe of double s rokes complet ed befor burs

shal be not les than that given in Ta le 6

Table 6 — Abrasio resistance of co ered hose (clas es 1, 2, 3 an 4)

6.5 Low temperature fle x ibi ity

The t es shal be car ied out in ac ordanc with ISO 1 619- 2:2 1 , Cla use5 (Method B) using a man r l

of out ide diamet er eq al t o 1 × the inside diamet er of the hose Aft er ben ing the hose roun the

mandr l through 1 0° for (1 ± 2) s at a t empe atur of (− 20 ± 2) °C, or lowe if r q est ed, it shal not

show any signs of br aking or c acking an shal me t he pro f pr s ur r q ir ment given in Ta le 2

6.6 Hot surfac e r esistanc e

When t est ed in ac ordanc with An ex E at a t es t empe atur of (3 0 ± 1 ) °Cfor ty es A an B an of

(40 ± 1 )°C for ty e C, in none of the four t es s shal the t es pie e show signs of leakag e within 60 s of

the a plcation ofthe f ilament rod or on r mo al of this filament rod aft er the spe if ied pe iod

6.7 Ozone resistanc e

Aft er car ying out an ozone r sis anc t es in ac ordanc with ISO 7 2 :2 0 , 8.1 (Method 1) for al

inside diamet er siz s an ty es, the hose lning an co e shal not show any signs of c acking The

l ning shal be ex mined b slt ing thehose wal

6.8 Bending and c ush r esistanc e

When t est ed in ac ordanc with An ex F at a t empe atur of (2 ± 2) °C, the ratio T:D shal not ex ce d

1,2

6.9 UV resistanc e (x non arc lamp)

NOTE A test or resistance t o UV an req irements b sed on ISO 3 0 3 wil b ad ed at ne t revision of this

part of ISO 4 42, when more e perience has b en acq ired

6.10 Los in mas on he ting

When t est ed in ac ordanc with ISO 176:2 0 , 6.2 (Method B), the l ning an cover mat erials shal not

show a los in mas gr at er than 4 %

6.11 Defor mation under c ushing ( ype C onl y)

When t est ed in ac ordanc with An ex G, the t es pie e shal al ow the fr e pas ag e of a b l of the

diamet er spe ified in Ta le 7

Table 7 — Deformatio un e c ushing

Inside diamet er

Crush dimension,

out ide diamet er

In some cir ums anc s it is not the man factur r w ho sup les the hose complet e with coupl ngs

at ached In this case, the pur hase should be awar that this is out ide the sco e of this p rt of

ISO 4642 an should ensur b othe means that the se urity of the hose as embly has be n t est ed

Whe e the hose coupl ngs ar f itt ed b the hose man factur r, the se urity of the hose as embly shal

be t est ed in ac ordanc with An ex I, b the man factur r, befor delvery t o the pur hase The e shal

be no sign of leakag e or mo ement of the hose from the coupl ng

The hose man factur r should fit hose couplngs that conform t o any r lev nt national s an ards or

leg l r q ir ment of the cou try of use

7 Frequency oftesting

Ty e tes ing an routine t es ing an the minim um fr q ency of such t es s shal be as spe ified in An ex J

Ty e t es s ar those t es s car ied out in orde t o o tain prod ct a pro al

R outine t es sar those car ied out on each length of hose or hose as embly

Prod ction t es s ar those t es s, spe if ied in An ex K, w hich should pr fe a ly be car ied out t o control

the q alty of man factur The fr q encies spe ified in Annex Jar given as a guide only

8 T ype tests

Ty e t es ing is car ied out in orde t o conf irm that al the mat erials, cons ruction an t es r q ir ment

of this p rt of ISO 4642 ha e be n met b the method of man factur an hose design

Ty e t es ing shal be r peat ed at a minimum of eve y five years or w heneve the e is a chang e in the

method of man factur of mat erials

9 Test r eport

A t es r p rt shal be sup led if r q est ed b the cust ome

10 Rec ommendation for packag ing and storag e

Detaisof packa ing an st orag e ar given in ISO 8 3

11 Mar king

Each length of hoseshal be legibly an pe manently marked with the fol owing minimum information,

at leas twic pe length, at b th en s, for ty e B hoses an along the w hole length at minimum int erv ls

of 2 m for ty e A an ty e Choses:

a) man factur r’ s name or trademark ;

b) n mbe of thisp rt of ISO 4642, i.e ISO 4642- 2;

c) hose cat eg ory;

d) ty e, clas ;

e) inside diamet er in mi lmetr s;

f) ma imum working pr s ur in MPa (bar);

g) q art er an year of man factur ;

h) t es t empe atur if lowe than − 20 °C ( e 6.5);

i) a pro al n mbe an c rtifying b dy or it r fe enc , w he e a plca le

E AMP E Man- SO 4 42-2- -A-2 1 - (1 b r)- 2Q/ 0 5

A 3.1 So r c e of hydrostatic pr es ure, w ith wate as the tes medium, ca a le of maintaining a

pr es ure of 1,5 MPa for categ ory I hose an of 4,0 MPa for categ ory I hose

A 4 Proc edure

Conne t the t es pie e t o the pr s ur sour e an f il with wat er, ex el ng al air befor se ur ly

clamping the fr e en of the hose Maintain a pr s ur of 0,0 MPa in the t es pie e w hie ben ing it

through 1 0° at a p int a pro imat ely midwa along it length Tie the fr e en of the hose b ck on

it elf, as close as p s ible t o the se ur en , so as t o form a sharp kink, ensuring that the tie does not

pr vent ubseq ent ex ansion of the diamet er of the t es pie e

Raise the pr s ur in the t es pie e t o that given in 6.1.4 o e a pe iod of 6 s Maintain the pr s ur for

1 min Ex mine the t es pie e for any sign of leakag e or damag e prior t o r leasing thepr s ur

A 5 Test r eport

The t es r p rt hal inclu e the fol owing information:

a) a ful desc iption ofthe hose t est ed;

b) a r fe enc t o this p rt of ISO 4642, i.e ISO 4642- 2;

c) any evidenc of leakag e or damag e o se ved;

d) thedat e of the t es

A nne x B

(normative)

Ac c elerated ag eing test

B.1 Test piec es

F our t es pie es, each of 1 m length, shal be t est ed

It is pr fe r d that the t es pie es be taken from the hose adjac nt t o the original burs an adhesion

Aft er ag eing, subje t hr e of the t es pie es t o the burs pr s ur t es as given in 6.1.3

Subje t he r maining tes pie e t o theadhesion t es as given in 6.2

B.4 Test Report

The t es r p rt shal inclu e the fol owing information:

a) a ful desc iption of the hose t est ed;

a) a r fe enc t o this p rt of ISO 4642, i.e ISO 4642- 2;

b) theburs t es v lue;

c) theadhesion v lue an any evidenc of t earing;

d) thedat e of the t es

C.2.1 Test machine, for a rading the surfac of a pr es uriz d r otata le tes pie e with a later aly

mo ea le a rading strip which is contin aly renewed S e Fig ur e C.1

The driven rotating coupl ng is f ix ed in the a ial dir ction w he eas the othe couplng can be mo ed

a ial y in a guide

The a rasion arm is in the form of a rocker piv t ed t o swivel upwards, an the weight of the arm is such

that a for e of 1 5 N act on the t es pie e w hen it is set horizontaly This a rasion arm r ciprocat es

along the hose a is at a rat e of between 1 mm s

–1

t o 2 mm s

–1

o e a dis anc of 8 mm, with the

dir ction of tra el being chang ed a ut omatical y The p use time at the r ve sal p int shal not ex ce d

0,1s in each case

The a rasion arm car ies the a rading s rip w hich mo es 4 mm along the hose length for each double

s roke, an the t es pie e issup ort ed midwa along it length b plain rol e s

C.2.2 A ir pres ur e ves el, w ith a ca acity of at leas 2l, fited to the tes machine to r etain the pres ur e

in the event of los of wate

C.2.3 Abrasi ve material, consisting of a r ol of coru d m twil eme y cloth measuring 5 mm wide

and a pr ox imately 5 m long The a rasive used for this a rasive mate ial shal be synthetic 1 , g ood

q al ty fused aluminium o ide (A l

2O

3) with a minimum A l

2O

3content of 7 % b mas It shal ha ve a

g r ain siz of 6 P ( e Refer enc [4])

C.3 Proc edure

Position the t es pie e in the machinean con e t t o the pr s ur sour e Fi it with wat er at 2 ± 3)°C

ex el ng al air

When a pr s ur of 0,5MPa has be n achieved, che k that he a rading arm an t es pie e ar horizontal

an rotat e the t es pie e at (2 ± 1) r v min (a pro imat ely 0,45 s

1

) in a clockwise dir ction w hen

viewed from the side of the wat er inlet as in icat ed in Figur C.1

Aft er the spe ified n mbe ofr v lutions ( e Ta le 5) submit the t es pie e t o the ma imum working

pr s ur asgiven in Ta le 2

R epeat the proc dur with the r maining four t es pie es

Figure C.1 — Surface abrasio test machine

C.4 Test report

The t es r p rt shal inclu e the fol owing information:

a) a ful desc iption of the hose t est ed;

b) a r fe enc t o this p rt of ISO 4642, i.e ISO 4642- 2;

c) thea rasion r sult inclu ing the n mbe of r v lutions an any faiur s;

d) thedat e of the t es

A nne x D

(normative)

D.1 Test pieces

Five t es pie es of hose, each 1 m in length, shal be t est ed Sinc the a rasion r sis anc shal be

det ermined at f ive eq idis ant p sitions arou d the hose, each t es pie e shal be marked at one of the

five positions, r ady for a rasion t es ing, using the c ntr of one fac as a r fe enc p int

D.2.1 Test machine, for a r ading the up e surfac of thetes pie e with a r ecipr ocating mo ement as

shown in Fig ur e D.1 The a r ading stripis mou ted in a car ie an set at an angle of 45° to thehorizontal

ax is of the tes pie e and at an angle of 2 ° to the dir ection of the r ecipr ocating action of the tes machine

The r ciprocating mo ement shal ha e a fr q ency of 5 t o 6 double s rokes pe min t e an the

length of a single s roke shal be 2 0 mm

The machineshal ex ert a downward for e of 1 ,5 N on the t es pie e

The a p ratus should be contained in a b x with a shatt er-r sis ant transp r nt co e an it is

r commen ed that it be made from a rus -r sis ant mat erial

D.2.2 A ir noz le, fitted to the tes machine an prod cing a contin ous jet ofair to r emo e debris fr om

the planeof a r asion

D.2.3 Abrasi ve cloth, measuring 2 mm × 3 0 mm should be used as the a rading medium T e

a r asive used for this a rasive cloth shal be g ood q alty fused aluminium ox ide (A l

2O

3) fr ee fr om

ex traneous mate ials an with a minimum A l

2O

3content of 9 % b mas It shal ha ve a g rain siz of

5 P ( e Refer enc [4]) The cloth shal be of g ood q alty coton ha ving a minimum warp-wa y br eaking

streng th of 1 39 N and a minimum wef-wa y br eaking s r eng th of 43 N

Thea rasive s ripshal be r newed for each t es