Leather — Bovine wet blue — Specification

Cuir — Peaux de bovins à l'état "bleu humide" — Spécifications

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ISO 5433:1999 - Leather -- Bovine wet blue -- Specification
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Leather — Bovine wet blue — Specification
Cuir — Peaux de bovins à l'état «bleu humide» — Spécifications
Reference number
ISO 5433:1999(E)
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ISO 5433:1999(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

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.

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.

International Standard ISO 5433 was prepared by Technical Committee ISO/TC 120, Leather, Subcommittee SC 2,

Tanned leather.

Annex A forms an integral part of this International Standard. Annex B is for information only.

© ISO 1999

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic

or mechanical, including photocopying and microfilm, without permission in writing from the publisher.

International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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Leather — Bovine wet blue — Specification
1 Scope

This International Standard specifies requirements, methods of sampling and methods of test for wet blue leather

produced from bovine hides and parts of bovine hides tanned without hair and with the use of basic chromium

sulfate as the primary tanning agent.
2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this

International Standard. At the time of publication, the editions indicated were valid. All standards are subject to

revision, and parties to agreements based on this International Standard are encouraged to investigate the

possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO 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 4045:1975, Leather — Determination of pH.
3 Definitions

For the purposes of this International Standard, the following 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 growing 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.

the part of the hide covering the underside and part of the legs of the animal
double back the part of the hide remaining after the belly has been removed

the fore part of the hide covering the shoulders and the neck of the animal, with or without the head

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ISO 5433:1999(E)
the part of the hide remaining after the belly and shoulder have been removed

half a whole hide with offal (head, shoulder and belly) attached, obtained by dividing it along the line of the


the rear part of a bovine hide, comprising the butt, the belly middles and the hind shanks

the fore part of a bovine hide, consisting of the shoulders and fore shanks
4 Requirements
4.1 Raw material

Bovine wet blue leather shall be processed from cured or fresh hides or part hides.

4.2 Form and trimming

4.2.1 Bovine wet blue leather shall be in one or more of the following forms, as specified by the purchaser:

a) whole hides;
b) bellies;
c) dossets (double backs);
d) shoulders;
e) butts;
f) sides;
g) culattas;
h) fronts.
4.2.2 The trim shall be as agreed between supplier and purchaser.
4.3 Tanning

After pretanning operations, bovine hides or part hides shall be tanned with basic chromium sulfate as the primary

tanning agent. The cut cross-section shall be such that the hide is completely penetrated by the bluish colour of the

chromium sulfate when examined visually. Tanning shall be carried out at a pH of 3,0 or above.

4.4 Fungicidal additives
Fungicides shall be used to inhibit mould growth in bovine wet blue leather.

NOTE 1 The fungicides used to inhibit mould growth and pigmentation should be effective and should not cause a health

hazard. The types of fungicide used and their dosage should preferably be agreed between the purchaser and the supplier.

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ISO 5433:1999(E)

NOTE 2 Fungicides should preferably be applied in quantities appropriate to ensure storage for up to 4 months at the

temperature and humidity prevailing during storage or transportation. The effectiveness of the fungicidal treatment may be

determined using one of the references given in annex B.
4.5 Presentation

Bovine wet blue leather shall be well fleshed, and the grain side shall be free from hair, including short hair and fine

hair. The size and grading shall be as agreed between the interested parties.

NOTE The wet blue leather should preferably have a tight grain and be free from creases, drum folds and stains caused by

iron salts. At least 95 % of the number of pieces in a lot should be free from stains caused by chromium salts, and the

aggregate of the stained area in any one piece should not exceed 10 % of the total area of the piece.

4.6 Shrinkage temperature

The shrinkage temperature shall meet the requirement for either low chrome tannage or full chrome tannage given

in table 1, when deter

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