BS EN ISO 483:2005

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

Sets out guidelines for the construction and use of enclosures with volumes less than 200 dm[3], 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.

This International Standard establishes guidelines for the construction and use of enclosures with volumes less than 200dm³, 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.