ISO 5432:1999

INTERNATIONAL ISO
STANDARD 5432
First edition
1999-12-15
Leather — Wet blue sheep skins —
Specification
Cuir — Peaux d'ovins à l'état «bleu humide» — Spécifications
Reference number
ISO 5432:1999(E)
©
ISO 1999

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ISO 5432:1999(E)
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ISO 5432:1999(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
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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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 5432 was prepared by Technical Committee ISO/TC 120, Leather, Subcommittee SC 2,
Tanned leather.
Annex A forms a normative part of this International Standard. Annex B is for information only.
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INTERNATIONAL STANDARD ISO 5432:1999(E)
Leather — Wet blue sheep skins — Specification
1 Scope
This International Standard specifies requirements, methods of sampling and test for wet blue leather produced
from sheep skins tanned without wool and with the use of basic chrome sulphate as the primary tanning agent.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 2418:1972, Leather — Laboratory samples — Location and identification.
ISO 3380:1975, Leather — Determination of shrinkage temperature.
ISO 4045:1977, Leather — Determination of pH.
IUC 8, Determination of the chromic oxide content of leather.
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
cured
preserved temporarily from putrefaction until it can be tanned
NOTE Any method of curing including wet or dry salting or drying is included.
3.2
pigmentation
colouration produced by fungi grown on wet blue chrome leather
NOTE The colouration produced by fungi will normally be black, white, green or yellow but can also be pink or violet.
4 Requirements
4.1 Raw material
The wet blue sheep skins shall be processed from cured or fresh sheep skins.
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ISO 5432:1999(E)
4.2 Tanning
After pretanning operations, the sheep skins shall be tanned with basic chromium sulfate as the primary tanning
agent. The cut cross section shall be such that the skin is completely penetrated by the bluish colour of chromium
when examined visually. Chrome tanning shall be completed at a pH of 3,0 or above.
4.3 Fungicidal additives
Fungicides shall be used to inhibit mould growth in wet blue sheep skins.
NOTE 1 Fungicides used to inhibit mould growth and pigmentation in wet blue sheep skins should be effective and should
not cause a health hazard. The type of fungicides used and their dosage should be as agreed upon between the purchaser and
the supplier.
NOTE 2 The fungicides should be applied in an appropriate quantity to ensure storage up to 4 months at the temperature
and humidity prevailing during storage or transportation. The efficacy of the fungicidal treatment may be determined using one
of the references given in Annex B.
4.4 Presentation
The wet blue sheep skins have a clean flesh side and the grain side shall be free from wool. The size and grading
shall be as agreed upon between the interested parties.
NOTE Wet blue sh
...