Bsi bs en 02155 9 1989

BRITISH STANDARD AEROSPACE SERIES BS EN 2155 9 1989 Test methods for transparent materials for aircraft glazing — Part 9 Determination of haze This European Standard EN 2155 9 has the status of a Brit[.]

This European Stand rd EN2 5 -9 has the status of a

British Stand rd

U C 6 9.7 0 3.2 :6 0.1:5 5.3

This British Stan ard,ha ing

b en pre ared u der the

directionof the Aerosp ce

Stan ards Polcy

Commite ,waspublshed

u derthe authorityof the

Bo rdofBSIon

3 Nov emb r1 8

© BSI 1 -1 9

The folowing BSI references

relate to the work on this

stan ard:

Commite reference ACE/62

Draft for comment 8 /70 0 DC

ISBN 0 5 0 1 9 9 X

The European Commit e for Stand rdization, u der whose superv ision this

European Stand rd was prep red, comprises the national stand rds

org anizations of the fol owing W estern European cou tries

Belg ium Institut belg e de normal sation

France Association f ançaise de normalsation

Germany Deuts hes Institut für Normu g e.V

Gre ce Helenic Org anization for Stand rdization

I eland National Stand rds Authority of I eland

Italy Ente Nazionale Ital ano di Unificazione

Luxemburg Inspection des trav ais et des mines

Netherlands Nederlands Normal satie- nstitu t

Portug al Instituto Portug uês d Qual d de

Sweden Stand rdisering skommis ionen i Sv erig e

Switz rland Association suis e de normalsation

United King dom British Stand rds Institution

Am endm ents is ued sinc publ cation

Amd No Date of is ue Comments

Pag e

National foreword

This British Stand rd has be n prep red u der the direction of the Aerosp ce

Stand rds Polcy Commit e and is the Eng lish lang uag e v er ion of

EN2 5 “A er ospa ce s r ie Te t method s fr tr a nspa r ent ma ter ia ls fr a ir cr a ft

gl a zing” Part9 “ Deter mina tion o ha ze” publshed b the European Commit e for

Stand rdization ( CEN) EN2 5 -9 was produced as a result of international

dis us ion in which the UK to k an activ e p rt

A British Stand rd do s not purport to include al the neces ary prov isions of a

contract User of British Stand rds are responsible for their cor ect a pl cation

Com pl anc with a British Standard do s not of itselfc nfer im munity

f om leg al obl g ations

Summ ary of pag es

This document comprises a font cov er, an inside f ont cov er, p g es i and i,

theEN title p g e, p g es 2 to 6, an inside b ck cov er and a b ck cov er

This stand rd has be n up ated ( se cop rig ht d te) and ma hav e ha

amendments incorporated.This wi be indicated in the amendment ta le on the

inside f ont cov er

NORME EUROPÉENNE

Mar h 1 89

UDC: 6 9.7 0 3.2 :6 0.1:5 5.3

Ke words:Air raft in ustry,glazing, transp rent plastic , glas ,tests,o tical pro erties

Eng lish ver ion

for aircraft g lazing

Série aérosp tiale

Méthodes d’es ais pour matériaux

transp rents pour vitrag es aéronautiques

Partie 9: Détermination du flou

Luft- und Raumfahrt

Prüfver ahren für transparente W erkstofe

zur Verg lasung von Luftfahr eug en

Tei 9: Bestimmung der Trübung

This European Stand rd was ac epted b CEN on19 8-0 -17 CEN member

are bou d to comply with the requirements of CEN Internal Reg ulations which

stipulate the conditions for g iv ing this European Stand rd the status of a

national stand rd without any alteration

Up-to-d te lsts and bibl og ra hical references concerning such national

stand rds ma be obtained on a pl cation to the CEN Central Sec etariat or to

any CEN member

This European Stand rd exists in thre oficial v er ions ( Eng lish, French,

German) A v er ion in any other lang uag e ma e b translation u der the

responsibi ity of a CEN member into its own lang uag e and notified to CEN

Central Sec etariat has the same status as the oficial v er ions

CEN member are the national stand rds org anizations of Austria, Belg ium,

Denmark, Finland, France, Germany , Gre ce, I eland, I eland, Italy ,

Luxemburg , Netherlands, Norway , Portug al, Sp in, Sweden, Switz rland and

United King dom

European Commit e for Stand rdization

Comité Europé n de Normalsation

Europ is hes Komite für Normu g

Central Se retariat: rue de Stas art 3 , B- 10 0 Brus els

© CEN 19 9 Copy rig ht reserv ed to al CEN member

Ref No EN 2 5 -9:19 9 E

This European Stand rd has be n prep red b the

European Association of Aerosp ce Man facturer

( AECMA)

After enquiries and v otes car ied out in ac ord nce

with the rules of this Association, this Stand rd has

suc es iv ely receiv ed the a prov al of the National

Associations and the Oficial Serv ices of the member

cou tries of AECMA, prior to its presentation to

CEN

According to the Common CEN/ CENELEC Rules,

fol owing cou tries are bou d to implement this

European Stand rd: Austria, Belg ium, Denmark,

Finland, France, Germany , Gre ce, I eland,

I eland, Italy , Luxemburg , Netherlands, Norway ,

Portug al, Sp in, Sweden, Switz rland and the

United King dom

Contents

Pag e

1 Scope and field of a plcation 3

Fig ure 2 — Haz meter with piv oting sphere 5

1 Scope and field ofappl cation

This stand rd specifies the determination of the haz of planar sections of transp rent plastic , using a

haz meter b sed on an integ rating sphere This method is not recommended for the measurement of haz

v alues g reater than3 % as determined b this method

2 Definitions

Haz is defined as the s at er of lg ht fom an ac umulation of tiny p rticles within the material, or f om

v ery smal defects on the sur ace This can lea to an obs uration of the v iew throug h the material or the

sprea ing of an imag e bey ond its proper l mits

3.1 Ha zemeter

The a p ratus shal consist of a haz meter, constructed es ential y as shown inFig ure 1 orFig ure 2

3.1.1 Integr a ting spher e

An integ rating sphere shal be used to col ect the transmit ed flux The sphere ma be of any diameter so

long as the total port area do s not exce d4% of the internal reflecting area of the sphere

The entrance and exit ports shal be centred on the same g reat cir le of the sphere and there shal be at

least17 ° of ar betwe n centres The exit port shal subtend an ang le of8° at the centre of the entrance

port The a is of the ir a iating beam shal p s throug h the centres of the entrance and exit ports

The photocel or photocels shal be positioned on the sphere ( 90±10)° f om the entrance port In the

piv ota le model, Fig ure 2, which is desig ned to use the interior sphere wal a jacent to the exit port as the

reflectance stand rd, the ang le of rotation shal not exce d10°

3.1.2 Light bea m

The specimen shal be i luminated b a substantial y unidirectional beam; the ma imum ang le which any

ra of this beam makes with the direction of its a is shal not exce d3° The beam shal not be v ignet ed

at either port of the sphere W hen the beam is u obstructed b the specimen, its c os section at the exit

port shal be a proximately cir ular, sharply defined, and concentric within the exit port, leav ing an

an ulus of ( 1,3±0,1)° subtended at the entrance port W hen the specimen is placed immediately ag ainst

the integ rating sphere at the entrance port, the ang le betwe n the normal to its surace and the a is of the

beam shal not exce d8°

3.1.3 R eflectng sur fa ce

The sur aces of the interior of the integ rating sphere, b fles, and reflectance stand rds shal be of

substantialy equal reflectance, mat , and hig hly reflecting throug hout the v isible wav e leng ths ( Freshly

smoked mag nesium oxide is excelent for this purpose but hig hly reflecting mat sphere p ints are more

dura le)

3.1.4 Light tr a p

For some measurements the stand rd at the exit port is replaced b a l g ht tra b actual remov al of the

reflectance stand rd or b piv oting the sphere ( se Fig ure 2) The l g ht tra shal a sorb the beam

completely when no specimen is present

Due to the a sorbing an ulus sur ou ding the u impeded beam at the exit port, this tra wi a sorb

sl g htly more than the u dev iated portion of the total flux transmit ed b the specimen

3.1.5 Photoelectr ic c ll

The ra iant flux within the sphere shal be measured b a photo lectric cel , the output measurements of

which shal be proportional within1 % to the incident flux ov er the rang e of intensity used Spectral

conditions for sour e and receiv er shal be constant throug hout the test or each specimen

The desig n of the instrument shal be such that there shal be a z ro rea ing of the g alv anometer deflection

or measuring instrument when the sphere is d rk The spectral response of the photocel shal be cor ected

to a proximate that of the h man ey e

For the purpose of this stand rd the l g ht sour e is de med to be i luminant A of the International

Commis ion on Il uminant i.e a tu g sten fiament lamp operated at a colour temperature

of(2 8 5±28 ) K

For nearly colourles transp rent materials as used for air raft g lazing the v alues for% haz obtained

using i luminant C instea of i uminant A are not g eneral y sig nificantly diferent

3.2 The output fom the photocel ma be conv eniently rea on a dig ital v oltmeter

4 Specim ens

4.1 Preparation

Specimens shal be taken f om a she t The sur aces of the test specimens shal be substantial y flat and

p ralel Care shal be taken to remov e dust and g rease fom the specimens prior to measurement

Specimens shal be fe of s ratches, blemishes, and v isibly distinct internal v oids and p rticles, u les it

is specificaly desired to measure the contribution to haz due to these imper ections The efect of sur ace

defects ma be el minated b immer ing the specimen in a clear l quid of the same refactiv e index

4.2 Dimensions

The test specimens shal be3 mm in diameter, minimum, and smal enoug h to be tang ent to the sphere

wal The thick es of the test specimen shal be as furnished, or for comp rativ e purposes, shal

be( 3±0,1)mm

5 Procedur

Rea ing s — Determine the folowing four v alues for a g iv en location on a specimen:

6 Expr s ion ofr sults

6.1 Haze

Calculate per entag e haz as folows:

6.2 Per cent haz shal be ex res ed to nearest 0,1 %

6.3 Thick es of specimen shal be measured in mi lmetres to nearest0,02mm

7 Test r port

The test report shal include:

7.1 Thicknes of spe imen

7.2 % haz

Rea ing

desig nation

S e im en in

p sition

Light tra in

p sition

Re le tion

s and rd in

p sition

Quantity r pr sented

T

1

T

2

specimen

T

3

T

4

and specimen

Fig ure 1 — Hazem eter

Fig ure 2 — Hazem eter with pivoting sphere

National appendix A

The United King dom p rticip tion in the prep ration of this European Stand rd was entrusted b the

Aerosp ce Stand rds Polcy Commit e ( ACE/-) to Tech ical Commit e ACE/62 upon which the fol owing

bodies were represented:

British Plastic Federation

Ministry of Defence

Society of British Aerosp ce Comp nies Limited

3 9 Chiswick Hig h Roa

London

W 4 4AL

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