Tiêu chuẩn iso 04628 7 2016

© ISO 2016 Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 7 Assessment of degree o[.]

Paints and varnishes — Evaluation

defects, and ofintensity ofuniform

Part 7:

Peinture s et ve nis — Év lu tion de la dé radation de s r vê tement

— Désign tion de la q a tité et de la dimension de s déa ts, et de

l’intensité de s ch n ement u iforme s d’aspect —

Partie 7: Év lu tion du degré de f rina e se lo la méth de du

mor ea de ve lo rs

S con edition

2 16-0 -1

Refer ence n mb r

ISO 4 2 -7:2 16(E)

COPYRIGHT PROTECTED DOCUMENT

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F reword i v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms and definitio s 1

4 Principle 1

5 Materials 2

6 A sses ment 2

7 Test rep rt 3

Biblog raphy 5

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through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

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org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

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 sp nsible for identifying any or al such p t ent right Detais 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 an 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 3 , Paint a d v rni shes , Subcommitt ee SC 9,

G ene al tes t meth d fr p ints a d v rni shes

This se on edition canc ls an r plac s the f irs edition (ISO 46 8-7 :2 0 ), w hich has be n t ech icaly

r vised with the folowing chang es:

a) the pict orial r fe enc s an ard for n me ical chalking ratings 1 t o 5 ha e be n co ied from

ISO 46 8-6:2 1 ;

b) a normative r fe enc t o ISO 1 076 for i lumination for the as es ment has be n ad ed

ISO 46 8 consis s of the folowing part , un e the g ene al title Paints a d v rni shes — Ev lu tion o

degradatio o c oatin s — Des ig ation o q a tit y a d s i ze o defec ts, a d o intens it y o u ifrm cha ges

in a peara c e:

— Part 1: G ene al introduc tio a d des ig atio sys tem

— Part 2 : As ses s ment o degr e o bli s te in

— Part 3 : As s es s ment o degr e o rus tin

— Part 4 : As s es s ment o degr e o c rackin

— Part 5: As s es s ment o degr e o flakin

— Part 6 : As s es s ment o degr e o chalkin b ta e meth d

— Part 7: As ses s ment o degr e o chalkin b velvet meth d

— Part 8: As s es s ment o degr e o delamin tion a d c or os io  aro nd a s c ribe or othe  artific ial defec t

— Part 10: As ses s ment o degr e o fi frm c or os ion

P aints and varnishes — Evaluation ofdeg radation of

Part 7:

This p rt of ISO 46 8 spe if ies a method suita le, in p rticular, for rating the degr e of chalking

on w hit e or colour d ext erior co tings an co ting sy st ems on rough surfac s ( i.e those ha ing a

rough es gr at er than segment 4 of the r fe enc comparat or G as desc ibed in ISO 8 0 -1)

The tes method spe if ied can also be used for the as es ment of the degr e of chalking of co tings

an co ting sys ems on smo th surfac s, but he method spe if ied in ISO 46 8-6:2 1 is pr fe a le for

this purpose

The tes method is a plca le to co tings and co ting sys ems on mine al subs rates, e.g f ibr c ment,

brick, conc ete, an r n e ings, in epen ent of the s ructur of the surfac The method can be used

q ite efe tively by ex e ienc d o e ators and is r commen ed for la oratory use as wel as for

on-site ev luation

NOTE 1 When a reference to this t est method is inclu ed in specif ications, the t est con itions (i.e weathering

method an substrat e)have to b a re d b tween the int erested parties

NOTE 2 T e method des rib d in this part of ISO 4 2 is a relative ran ing method an is therefore not

suita le for use in a re ments b tween parties.S e, however, the Note to Ta le 1

NOTE 3 R efer t o ISO 4 2 -1 for the designation system for q antity an size of defects an the intensity of

chang s in ap e rance of co tings, as wel as g neral principles of the syst em

2 Normati ve r eferences

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 pl es F or u dat ed

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

ISO 1 07 6, Paints a d v rni shes — Lig tin a d proc edur fr v i s ual as ses s ment o c oatin s

3 Terms and definitions

F or the purposes of this document, the folowing t ermsand definitions a ply

3.1

chalking

a pearanc of a lo sely adhe ent f ine p wde on the surfac of a film arising from the degradation of

one or mor of it cons ituent

4 Principle

L osely ad e ent p wde is r mo ed from the co ting un e t es , using a suita le fa ric The degr e of

5 Materials

5.1 Fabr ic, as ag reed betwe n the interes ed p rties, to rub agains the surfac being tes ed Black

wo l felt , velvet , and velvete n ha ve proven particular ly efe tive for lg ht co ting s an a white fa ric for

dar k co ting s

Car y out the as es ment u de g ood i lumination, as spe if ied in ISO 1 076

Car y out the as es ment in d plcat e, unles othe wise a r ed

Using the in ex fing er, pr s the fa ric a ains the co ting being t est ed with f irm pr s ur R otat e the

fa ric onc through an angle of 1 0° R emo e the fa ric an as es thedegr e of chalking u de difuse

l ght in r fe enc t o the rating scheme shown in Ta le 1

A me hanical a p ratus should be pr fe r d if compara le r sult ar o tained; the co ting ma also

be wiped onc with the fa ric

Table 1 — Rating s heme for designating the de re of chalking (derived from

ISO 4628-1:201 , Table 3)

1 very slight, i.e just per eptible chalking

2 slight, i.e cle rly per eptible chalking

3 moderate, i.e very cle rly per eptible chalking

N TE If spe if ied or agre d, a simpler ratin sys em c n be used However, in such c ses, the me nin s of the ratin s in

this table which are used shal not be chan ed in order to avoid c nfusion

Ex mples of pict orial s an ards for as es ing the degr e of chalking ar given in Figur 1 The f igur

is o tained with the ta e method spe if ied in ISO 46 8-6:2 1 , but the degr es of chalking 1 t o 5 ar

comp ra le t o those spe ified in this p rt of ISO 46 8

The amou t of powde ma v ry o e a given ar a The efor , the t es shal becar ied out at an a e ag e

location on the co ting On larg e surfac s, the as es ment shal be made at seve al locations, an the

mean an rang e r p rt ed

Ratings o tained with co tings ex osed t o natural weathe ing shal be tr at ed with caution, as dirt

from the atmosphe e dep sit ed on the surfac can give a normaly high v luesof the degr e of chalking

NOTE T e right-han en of e ch tape cor espon s t o chalking rating of 0.

Figure 1 — Pictorial reference standards for numerical chalking ratings 1 to 5

7 Test r eport

The t es r p rt hal contain at leas the folowing information:

a) al detais ne es ary t o identify the co ting t est ed;

b) a r fe enc t o this p rt of ISO 46 8, i.e ISO 46 8-7 ;

c) thety e of surfac ex mined, it siz an , if a pro riat e, it location;

d) then me ical rating of the degr e of chalking in ac ordanc with Cla use 6 (mean v lue, rang e, an

n mbe of as es ment );

e) al detai s ne es ary t o identify the fa ric used;

f) w hethe the r sult was o tained using the in ex f ing er or a p rticular a paratus (detais t o be

in icat ed);

g) detai s of any deviation from the proc d r spe if ied;

h) any u usual featur s (anomales)o se ved d ring the as es men

i) thedat e of the ex mination

Bibl og raphy

[1] ISO 46 8-1, Paints a d v rni shes — Ev lu tio o degradatio o c oatin s — Des ig atio o

q a tit y a d s i ze o defec ts, a d o intens it y o u ifrm cha ges in a peara c e — Part 1: G ene al

introduc tio a d des ig atio sys tem

[2] ISO 46 8-6, Paints a d v rni shes — Ev lu tio o degradatio o c oatin s — Des ig atio o

q a tit y a d s i ze o defec ts, a d o intens it y o u ifrm cha ges in a peara c e — Part 6 : As s es s ment

o degr e o chalkin b ta e meth d

[3] ISO 8 0 -1, Prep ratio o s te l s ubs trates befr a plc atio o p ints a d r lated produc ts —

S rfc e  ro g nes s  charac te i s tic s  o  blas t-clea ed  s te l  s ubs trates  —  Part  1:  S ec ific atio s  a d 

de initio s fr ISO s urfc e profie c omp rators fr the as s es s ment o a ras i ve blas t-clea ed s urfces

ICS  87.040

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