Leather — Wet blue sheep skins — Specification

Cuir — Peaux d'ovins à l'état "bleu humide" — Spécifications

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ISO 5432:1999 - Leather -- Wet blue sheep skins -- Specification
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Leather — Wet blue sheep skins —
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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ii © ISO 1999 – All rights reserved
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ISO 5432:1999(E)

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

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Commission (IEC) on all matters of electrotechnical standardization.

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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.

© ISO 1999 – All rights reserved iii
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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.

preserved temporarily from putrefaction until it can be tanned
NOTE Any method of curing including wet or dry salting or drying is included.
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.
© ISO 1999 – All rights reserved 1
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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

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