SIST EN ISO 483:2006

SLOVENSKI STANDARD
SIST EN ISO 483:2006
01-april-2006
1DGRPHãþD
SIST EN ISO 483:2000
Polimerni materiali - Majhne komore za kondicioniranje in preskušanje z uporabo
vodnih raztopin za vzdrževanje stalne vlage (ISO/DIS 483:2004)
Plastics - Small enclosures for conditioning and testing using aqueous solutions to
maintain the humidity at a constant value (ISO 483:2005)
Kunststoffe - Kleine Kammern für die Konditionierung und Prüfung bei konstanter
Luftfeuchte über wässrigen Lösungen (ISO 483:2005)
Plastiques - Petites enceintes de conditionnement et d'essai utilisant des solutions
aqueuses pour maintenir l'humidité a une valeur constante (ISO 483:2005)
Ta slovenski standard je istoveten z: EN ISO 483:2005
ICS:
83.200 Oprema za gumarsko Equipment for the rubber and
industrijo in industrijo plastics industries
polimernih materialov
SIST EN ISO 483:2006 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 483:2006

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SIST EN ISO 483:2006
EUROPEAN STANDARD
EN ISO 483
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2005
ICS 83.200 Supersedes EN ISO 483:1999
English Version
Plastics - Small enclosures for conditioning and testing using
aqueous solutions to maintain the humidity at a constant value
(ISO 483:2005)
Plastiques - Petites enceintes de conditionnement et Kunststoffe - Kleine Kammern für die Konditionierung und
d'essai utilisant des solutions aqueuses pour maintenir Prüfung bei konstanter Luftfeuchte über wässrigen
l'humidité à une valeur constante (ISO 483:2005) Lösungen (ISO 483:2005)
This European Standard was approved by CEN on 4 November 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 483:2005: E
worldwide for CEN national Members.

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SIST EN ISO 483:2006

EN ISO 483:2005 (E)





Foreword


This document (EN ISO 483:2005) has been prepared by Technical Committee ISO/TC 61
"Plastics" in collaboration with Technical Committee CEN/TC 249 "Plastics", the secretariat of
which is held by IBN.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by May 2006, and conflicting national standards
shall be withdrawn at the latest by May 2006.

This document supersedes EN ISO 483:1999.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 483:2005 has been approved by CEN as EN ISO 483:2005 without any
modifications.

2

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SIST EN ISO 483:2006

INTERNATIONAL ISO
STANDARD 483
Second edition
2005-11-15

Plastics — Small enclosures for
conditioning and testing using aqueous
solutions to maintain the humidity at
a constant value
Plastiques — Petites enceintes de conditionnement et d'essai utilisant
des solutions aqueuses pour maintenir l'humidité à une valeur
constante




Reference number
ISO 483:2005(E)
©
ISO 2005

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SIST EN ISO 483:2006
ISO 483:2005(E)
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ii © ISO 2005 – All rights reserved

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SIST EN ISO 483:2006
ISO 483:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Principle. 1
4 Materials . 2
5 Aqueous solutions. 2
6 Apparatus . 4
7 Procedure . 4
7.1 General. 4
7.2 Method A: Using saturated aqueous salt solutions. 5
7.3 Method B: Using aqueous glycerol solutions . 5
7.4 Method C: Using aqueous sulfuric acid solutions . 6
8 Tolerances on standard atmospheres. 7
8.1 General. 7
8.2 Normal tolerances. 7
8.3 Close tolerances . 7
9 Precision and bias . 7
10 Test report . 8
3
Annex A (normative) General features of a conditioning enclosure with a volume of 15 dm to
3
200 dm . 9
Bibliography . 11

© ISO 2005 – All rights reserved iii

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SIST EN ISO 483:2006
ISO 483:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 483 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, chemical
and environmental resistance.
This second edition cancels and replaces the first edition (ISO 483:1988), in which the values of the relative
humidity above the saturated salt solutions have been corrected to the values given in Reference [1] (see the
Bibliography) which are generally accepted as the most reliable values by national physical laboratories.
iv © ISO 2005 – All rights reserved

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SIST EN ISO 483:2006
ISO 483:2005(E)
Introduction
The properties of many plastics are strongly influenced by the relative humidity of the surrounding air.
This International Standard describes small cabinets for conditioning and testing of specimens at constant
temperature and constant relative humidity above aqueous solutions of salts, sulfuric acid and glycerol.
© ISO 2005 – All rights reserved v

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SIST EN ISO 483:2006

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SIST EN ISO 483:2006
INTERNATIONAL STANDARD ISO 483:2005(E)

Plastics — Small enclosures for conditioning and testing using
aqueous solutions to maintain the humidity at a constant value
1 Scope
This International Standard establishes guidelines for the construction and use of enclosures with volumes
3
less than 200 dm , in order to obtain atmospheres of constant relative humidity at given temperatures, using
saturated aqueous salt solutions, glycerol/water solutions or sulfuric acid/water solutions, for conditioning and
testing plastics.
It specifies the procedures to be followed to maintain the relative humidities of the conditioning and testing
atmospheres within the required tolerances, at the temperatures specified by particular International
Standards.
The procedures described are intended for conditioning small quantities of materials prior to test, and for such
tests as may be carried out entirely within a small enclosure, e.g. electrical tests. The guidelines described do
not apply to enclosures requiring frequent opening.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
3 Principle
In a relatively small, closed container, aqueous solutions of specified concentration can be used to produce
atmospheres with specific relative humidities under equilibrium conditions. Such atmospheres can be
generated by using binary saturated aqueous salt solutions (see method A and Table 1), by using specific
concentrations of aqueous glycerol solutions (see method B and Table 2) or by using aqueous sulfuric acid
solutions (see method C and Table 3). In the case of method B and method C, it is necessary to measure and
control the concentrations of these solutions.
Information is given concerning the methods of producing desired relative humidities in these enclosures at
temperatures from 0 °C to 70 °C.
[1]
The relative-humidity values indicated have been taken from the literature . The uncertainties involved are
discussed in Clause 9.
© ISO 2005 – All rights reserved 1

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SIST EN ISO 483:2006
ISO 483:2005(E)
4 Materials
4.1 Salts, of recognized analytical grade.
4.2 Glycerol, of reagent quality.
4.3 Sulfuric acid, of reagent quality.
4.4 Water, grade 3 as defined in ISO 3696:1987.
NOTE The exact purity of the chemicals used when the original conditions were developed is not known, but any
differences between those chemicals and reagent-grade chemicals are expected to be negligible.
5 Aqueous solutions
5.1 Saturated aqueous salt solutions (see Table 1), with an excess of salt covered by the solution in
order to keep the solution saturated.
5.2 Aqueous glycerol solutions (see Table 2), of specified concentrations.
5.3 Aqueous sulfuric acid solutions (see Table 3), of specified concentrations.
Table 1 (for use with method A) — Relative humidity of air over saturated aqueous salt solutions at
temperatures between 5 °C and 70 °C
Relative humidity (%) at temperature θ
Saturated aqueous salt solution
5 °C 10 °C 15 °C 20 °C 25 °C 30 °C 35 °C 40 °C 50 °C 60 °C 70 °C

a
1 Potassium hydroxide (KOH) 14 12 11 9 8 7 7 6 6 6

b
2 Lithium chloride (LiCl⋅xH O) 11 11 11 11 11 11 11 11 11 11
2
3 Potassium acetate (CHCOOK) 23 23 23 23 22
3
Magnesium chloride hexahydrate
4 34 34 33 33 33 32 32 32 31 29

b
(MgCl ⋅6H O)
2 2
Potassium carbonate dihydrate
5 43 43 43 43 43 43
b
(K CO ⋅2H O)
2 3 2
Magnesium nitrate hexahydrate
6 59 57 56 54 53 51 50 48 45

b
[Mg(NO ) ⋅6H O]
3 2 2
7 Sodium bromide (NaBr) 64 62 61 59 58 56 55 53 51 50
8 Potassium iodide (KI) 73 72 71 70 69 68 67 66 65 63 62

b
9 Sodium chloride (NaCl) 76 76 76 75 75 75 75 75 74 75

b, c
10 Ammonium sulfate [(NH ) SO ] 82 82 82 81 81 81 80 80 79
4 2 4
11 Potassium chloride (KCl) 88 87 86 85 84 84 83 82 81 80

b
12 Potassium nitrate (KNO ) 96 96 95 95 94 92 91 89 85
3
13 Potassium sulfate (K SO) 99 98 98 98 97 97 97 96 96
2 4
a
Potassium hydroxide solution is corrosive and should not be allowed to come into contact with the skin.
b
These salts are recommended for particular humidity ranges because the change with temperature is very small over the range
20 °C to 30 °C.
c
Ammonium salts may cause corrosion of copper parts.

2 © ISO 2005 – All rights reserved

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SIST EN ISO 483:2006
ISO 483:2005(E)
Table 2 (for use with method B) — Relative humidity of air over aqueous glycerol solutions
at temperatures between 0 °C and 70 °C
Relative humidity (%) at
Approximate glycerol Refractive index
concentration at 25 °C temperature θ
25
% (by mass) n 0 °C 25 °C 50 °C 70 °C
D
10 1,346 3 98 98 98 98
20 1,356 0 96 96 96 97
25 1,360 2 95 95 96 96
35 1,377 3 89 90 91 91
45 1,390 5 84 85 86 87
52 1,401 5 79 80 81 82
58 1,410 9 74 75 76 77
64 1,419 1 69 70 71 72
69 1,426 4 63 65 66 67
74 1,432 9 58 60 61 63
77 1,438 7 53 55 57 58
81 1,444 0 48 50 52 53
84,5 1,448 6 43 45 47 48
87,5 1,452 9 38 40 42 43

Table 3 (for use with method C) — Relative humidity of air over aqueous sulfuric acid solutions
at temperatures between 5 °C and 50 °C
Sulfuric acid Density at Density at
Relative humidity (%) at temperature θ
concentration 23 °C 25 °C

3 3
% (by mass) g/cm g/cm 5 °C 15 °C 25 °C 35 °C 50 °C
5 1,030 7 1,030 0 98 98 98 98 98
10 1,064 8 1,064 0 96
...