SIST EN ISO 483:2000
(Main)Plastics - Small enclosures for conditioning and testing using aqueous solutions to maintain relative humidity at constant value (ISO 483:1988)
Plastics - Small enclosures for conditioning and testing using aqueous solutions to maintain relative humidity at constant value (ISO 483:1988)
Kunststoffe - Kleine Kammern für die Konditionierung und Prüfung bei konstanter relativer Luftfeuchte über wässerigen Lösungen (ISO 483:1988)
1.1 Diese Internationale Norm legt Richtlinien für die Bauweise und Anwendung von Behältnissen mit Volumen kleiner als 200 dm3 fest, zwecks Einstellung von Klimata mit konstanter relativer Feuchte bei gegebenen Temperaturen, unter Verwendung gesättigter, wässriger Salzlösungen, Glyzerin/Wasser-Lösungen oder Schwefelsäure/Wasser-Lösungen, zwecks Konditionierung und Prüfung von Kunststoffen.
Plastiques - Petites enceintes de conditionnement et d'essai utilisant des solutions aqueuses pour maintenir l'humidité relative a une valeur constante (ISO 483:1988)
Polimerni materiali - Majhne komore za kondicioniranje in preskušanje z uporabo vodnih raztopin za vzdrževanje stalne relativne vlage (ISO 483:1988)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 483:2000
01-maj-2000
Polimerni materiali - Majhne komore za kondicioniranje in preskušanje z uporabo
vodnih raztopin za vzdrževanje stalne relativne vlage (ISO 483:1988)
Plastics - Small enclosures for conditioning and testing using aqueous solutions to
maintain relative humidity at constant value (ISO 483:1988)
Kunststoffe - Kleine Kammern für die Konditionierung und Prüfung bei konstanter
relativer Luftfeuchte über wässerigen Lösungen (ISO 483:1988)
Plastiques - Petites enceintes de conditionnement et d'essai utilisant des solutions
aqueuses pour maintenir l'humidité relative a une valeur constante (ISO 483:1988)
Ta slovenski standard je istoveten z: EN ISO 483:1999
ICS:
83.200 Oprema za gumarsko Equipment for the rubber and
industrijo in industrijo plastics industries
polimernih materialov
SIST EN ISO 483:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 483:2000
---------------------- Page: 2 ----------------------
SIST EN ISO 483:2000
---------------------- Page: 3 ----------------------
SIST EN ISO 483:2000
---------------------- Page: 4 ----------------------
SIST EN ISO 483:2000
---------------------- Page: 5 ----------------------
SIST EN ISO 483:2000
---------------------- Page: 6 ----------------------
SIST EN ISO 483:2000
IS0
INTERNATIONAL STANDARD
483
First edition
1988-12-15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXAYHAPOAHAfl OPI-AHM3A~MFl I-IO CTAH~APTM3A~MM
Small enclosures for conditioning and
Plastics -
testing using aqueous solutions to maintain relative
humidity at constant value
Petites enceintes de conditionnement et d’essai utilisant des solutions aqueuses
Plastiques -
pour main tenir l’humidith relative ;i une valeur constan te
Reference number
---------------------- Page: 7 ----------------------
SIST EN ISO 483:2000
1st) 483 : 1988 E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies US0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 483 was prepared by Technical Committee ISO/TC 61,
Plastics.
It cancels and replaces IS0 Recommendation R 483 : 1966, of which it constitutes a
technical revision.
Annex A forms an integral part of this International Standard.
0 International Organization for Standardization, 1988
Printed in Switzerland
---------------------- Page: 8 ----------------------
SIST EN ISO 483:2000
IS0 483 : 1988 (El
INTERNATIONAL STANDARD
- Small enclosures for conditioning and
Plastics
testing using aqueous solutions to maintain relative
humidity at constant value
I Scope Standard. At the time of publication, the edition indicated was
valid. All standards are subject to revision, and parties to
agreements based on this International Standard are encouraged
1 .I This International Standard establishes guidelines for the
to investigate the possibility of applying the most recent edition
construction and use of enclosures with volumes less than
of the standard given below. Members of IEC and IS0 maintain
200 dm3, in order to obtain atmospheres of constant relative
registers of currently valid International Standards.
humidity at given temperatures, using saturated aqueous salt
solutions, glycerol/water solutions or sulfuric acid/water solu-
IS0 291 : 1977, Plastics - Standard atmospheres for con-
tions, for conditioning and testing plastics.
ditioning and testing.
It specifies the procedures to be followed to maintain the
relative humidities of the conditioning and testing atmospheres
3 Reagents and solutions
within the required tolerances, at the temperatures specified by
particular International Standards.
3.1 Salts (see table 11, of recognized analytical grade.
Information is given concerning the methods of producing
desired humidities in these enclosures at temperatures from
3.2 Glycerol, chemically pure.
5 OC to 60 OC. The relative humidity values indicated are
average values, in per cent, with permissible deviations of + 2.
3.3 Sulfuric acid, chemically pure.
1.2 The procedures described are intended for conditioning
small quantities of materials prior to test, and for such tests as 3.4 Distilled water, or water of equivalent purity.
may be carried out entirely within a small enclosure, e.g. elec-
trical tests.
3.5 Saturated aqueous salt solutions (see table I), with an
excess of salt covered by the solution for the maintenance of
The guidelines described do not apply to enclosures requiring
saturation.
frequent opening.
3.6 Aqueous glycerol solutions (see table 21, of specified
concentrations.
2 Normative reference
The following standard contains provisions which, through
3.7 Aqueous sulfuric acid solutions (see table 31, of
reference in this text, constitute provisions of this International
specified concentrations.
---------------------- Page: 9 ----------------------
SIST EN ISO 483:2000
IS0 483 : 1988 (El
Table 1 - Relative humidity of air over saturated aqueous salt solutions
at temperatures between 5 OC and 60 OC
Relative humidity (%) at temperature 8
Saturated aqueous salt solutions
5 OC IO OC 15 OC 20 OC 25 OC 30 OC 35 OC 40 OC 50 OC 60 OC
Potassium hydroxide (KOH)‘) 14 13 10 9 8 7 6 6 6 -
Lithium chloride (LiCl.xH,0)2) 12 12 12 12 12 11 11 11 11 11
Potassium acetate (CH,COOK) 25 24 24 23 22 22 21 20 - -
Magnesium chloride hexahydrate 34 34 34 33 33 33 32 32 31 30
(MgCI,.GH,0)2)
Potassium carbonate dihydrate 46 45 44 44 43 42 41 40 38 36
(K,CO, .2H,0)2)
Magnesium nitrate hexahydrate 58 57 56 54 53 51 50 48 46 43
[Mg(N0,),.6H2012)
Sodium dichromate dihydrate 59 58 56 55 54 52 51 50 47 -
(Na2Cr207.2H20)
Ammonium nitrate (NH,NO,)s) - 73 69 65 62 59 55 53 47 42
- -
Sodium nitrite (NaN0,)2) 4) - 66 64 63 62 61 60 58
Sodium chloride (NaCl)2) 75 75 75 75 75 75 75 75 75 75
Ammonium sulfate [(N H4)2SC4] 2) 3) 82 82 81 81 80 80 80 79 79 -
Potassium chloride (KCI) 88 87 86 86 85 84 84 83 81 80
Potassium nitrate (KNO,) 2) 97 96 95 94 93 91 89 88 85 82
Potassium sulfate (K2SO4) 98 98 97 97 97 96 96 96 96 96
1) Potassium hydroxide solution is corrosive and should not be allowed to come into contact with the skin.
2) These salts are recommended for particular humidity ranges because the change with temperature is very small over the range 20 OC to 30 OC.
3) Ammonium salts may cause corrosion of copper parts.
4) The addition of 1 % to 2 % sodium tetraborate has been found to reduce discoloration of sodium nitrite solutions. The relative humidity is
reduced by 1 % R.H. at 20 OC by this addition.
Table 2 - Relative humidity of air over aqueous glycerol solutions
at temperatures between 0 OC and 70 OC
Approximate
Refractive index
Relative humidity (%) at temperature 8
glycerol
at 25 OC
concentration
i-l25
D 0 OC 25 OC 50 OC 70 OC
% bnlm)
10 1,346 3 97,7 98,0 98,2 98,4
15 1,356 0 95,6 96,0 96,4 96,7
25 1,360 2 94,5 95,0 95,5 95,8
35 1,377 3 89,2 90,o 90,7 91,2
45 1,390 5 wo 85,0 85,9 86,6
52 1,401 5 78,8 80,O 81,l 81,8
58 1,410 9 73,7 75,0 76,2 77,0
64 1,419 1 686 70,o 71,3 72,2
69 1,426 4 63,4 65,0 66,4 67,3
74 1,432 9 58,4 60,O 61,4 62,5
77 1,438 7 5313 55,0 56,5 57,6
81 1,444 0 48,3 50,o 51,5 52,6
8415 1,448 6 43,3 45,0 4-W 47,7
87,5 1,452 9 38,3 460 41,6 42,7
---------------------- Page: 10 ----------------------
SIST EN ISO 483:2000
Is0 483 : 1988 (El
Table 3 - Relative humidity of air over aqueous sulfuric acid solutions
at temperatures between 5 OC and 50 OC
Sulfuric
~ Density Density
Relative humidity (%) at temperature 0
acid
at 25 OC at 23 OC
concentration
45 OC 50 OC
I 5OC , IO OC 1 15OC 1 20°C 1 23OC 1 25OC 1 30°C 1 35OC 1 40°C 1
% (m/m) g/cm3 g/cm3
I
r-
98 1 98 ) 98 98 98 98
1,030 7 98 98 98 98 ’ 98
5 1,030 0
95,5 95,5 95,5 95,5 95,5 95,5 95,5 95,5 95,5
10 1,064 0 1,064 8 95,5 95,5
92 92
92,5 92,5 92,5 92 92 92 92,5 92,5 92,5
15 1,099 4 1,100 5
1,137 6 87,5 88 88 88 88 88 i 88 88 8&5 88,5 8815
20 1,136 5
82 82,5 82,5 82,5 83 83 83 83
25 1,175 0 1,176 4 81,5 82 82
76,5 76,5
1,216 4 74 74,5 74,5 75 75 75 75,5 76 76
30 1,215 0
66,5 67 67,5 67,5 68
1,256 3 1,257 7 65 65,5 66 66,5 68,5
35 6415
55,5 56 56,5 56,5 57 57,5 58 59
40 1,299 1 1,300 5 54 55 58,5
47 48 49
1,343 7 I,3452 43 44 45 45,5 46 46,5 48,5
45 44,5
35 35 35,5 36,5 37 37,5 38,5
50 1,391 1 1,397 2 32,5 33 34 34,5
23 24 24,5 25 25 25,5 26 27 27,5 28
55 1.4412 I,4428 22,5
17 17,5 18 18,5 19
1,494 0 1,495 7 14 14,5 15 15,5 16 16
60
9 9 10 10,5 11 11,5
65 1,549 0 1,550 7 8 8 915 93
8,5
6
1,605 9 1,607 7 4 4 4 45 I I 5 5
70 3,5 415 4,5 5,5
4 Apparatus
The enclosure shall, however, be insulated from the surround-
ing environment in such manner that its internal regulation
apparatus and its air circulation can maintain a constant
4.1 If the volume of the enclosure is less than 15 dm3, the
temperature at all points of its usable volume within the
enclosure shall be a container, of simple shape, with internal
tolerance specified or within the tolerance on this temperature
walls which are easily cleaned and are inert with regard to the
as required by the tolerance on the relative humidity.
solutions used.
The internal height of the usable volume shall not exceed
The temperature shall be kept constant and uniform at all
1,5 times the smallest dimension of the free surface of the
points by placing the container in an oven, a water bath, or a
solution.
laboratory conditioned at constant temperature.
The cover of the enclosure shall be of an electrically insulating
A thermometer shall be placed inside the container to take
material and shall be equipped with wet-and-dry-bulb ther-
temperature readings during the test to + 1 K.
mometers readable to 0,l K from the exterior.
Air circulation is generally recommended, particularly when
The air shall circulate around the bulbs of these thermometers
hygroscopic materials are being tested. Uniform relative
at a velocity of about 3 m/s, after regulation of its relative
humidity can only be obtained by using a fan with blades
humidity by passage between the surface of the aqueous solu-
located just above the aqueous solution.
tion and a suitable air duct. To achieve this result, air circulation
may, for example, be arranged in such a manner that the
If the enclosure is intended only for conditioning practically
passage over the surface of the solution is preceded by heating,
non-hygroscopic materials or for conditioning over a long time
remote-controlled by a contact thermometer located in the
in relation to the water-absorption capacities of the specimens
usable volume of the enclosure at such a point that the
placed in it, air circulation may not be necessary.
temperature specified at this location is maintained in accord-
Without air circulation, the height of the container shall not ante with the specifications. (See also annex A.)
exceed the smallest dimension of the free surface of the solu-
tion, In containers with air circulation, this height may reach
At the end of the circuit, after passage through the usable
I,5 times the smallest dimension of this free surface. volume and before passage through the heater, the air shall be
cooled by suitable means to a temperature above the dew
point, at least when the enclosure and its contents are in
4.2 If the volume of the enclosure is between 15 dm3 and
equilibrium. For example, for the temperature and relative
200 dm3, the enclosure shall also be of simple shape, with in-
humidity sp
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.