ISO 6181:2023

Fertilizers and soil conditioners — Liquid methylene-urea slow release fertilizers — General requirements

This document specifies general requirements, analytical methods, sampling and preparation of test sample, marking and labelling, packaging, transport and storage for liquid methylene-urea slow release fertilizers. This document applies to pure liquid slow release fertilizers, i.e. methylene urea (MU). This document does not apply to mixtures of nitrogenous fertilizers containing liquid slow release fertilizers.

Engrais et amendements — Engrais liquides à libération lente à base de méthylène-urée — Exigences générales

General Information

• Status: Published
• Publication Date: 16-Mar-2023
• ICS: 65.080 - Fertilizers
• Technical Committee: ISO/TC 134 - Fertilizers, soil conditioners and beneficial substances
• Drafting Committee: ISO/TC 134 - Fertilizers, soil conditioners and beneficial substances
• Current Stage: 6060 - International Standard published
• Start Date: 17-Mar-2023
• Due Date: 09-Feb-2023
• Completion Date: 17-Mar-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6181
First edition
2023-03
Fertilizers and soil conditioners —
Liquid methylene-urea slow release
fertilizers — General requirements
Engrais et amendements — Engrais liquides à libération lente à base
de méthylène-urée — Exigences générales
Reference number
ISO 6181:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 6181:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 6181:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Visual inspection . 2
4.2 Requirements of liquid methylene-urea slow release fertilizers . 2
5 Analytical methods . 2
5.1 Visual inspection for foreign matter . 2
5.2 Determination of the mass fraction of total nitrogen . 2
5.3 Determination of the mass fraction of ureic nitrogen . 2
5.4 Determination of the mass fraction of methylene-urea reaction products nitrogen . 2
5.5 Determination of the ammonia nitrogen . 3
5.6 Determination of the nitric nitrogen . 3
5.7 Determination of the cyanamide nitrogen . 3
5.8 Determination of the biuret content . 3
5.9 Determination of the mass fraction of water insoluble matter . 3
5.10 Determination of the density. 3
6 Sampling and preparation of test sample . 3
6.1 Sampling method . 3
6.2 Test sample preparation . 3
7 Marking and labelling . 3
8 Packaging, transport and storage .4
Bibliography . 5
iii
© ISO 2023 – All rights reserved

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ISO 6181:2023(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 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 134, Fertilizers, soil conditioners and
beneficial substances.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
  © ISO 2023
...

ISO/DIS FDIS 6181:2022(E)
ISO TC 134
Secretariat: INSO
Fertilizers and soil conditioners — Liquid methylene-urea slow release fertilizers — General
requirements
First edition
Date: 2022-12-08-26

---------------------- Page: 1 ----------------------
ISO/FDIS 6181:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of
this publication may be reproduced or utilized otherwise in any form or by any means, electronic or
mechanical, including photocopying, or posting on the internet or an intranet, without prior written
permission. Permission can be requested from either ISO at the address below or ISO's member body in
the country of the requester.
ISO Copyright Office
CP 401 • CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: [e-mail]
Website: www.iso.org
Published in Switzerland.
ii © ISO 2022 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 6181:2022(E)
Contents Page
Foreword .4
Introduction. 5
Fertilizers and soil conditioners — Liquid methylene-urea slow release fertilizers — General
requirements . 1
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Visual inspection . 2
4.2 Requirements of liquid methylene-urea slow release fertilizers . 2
5 Analytical methods . 2
5.1 Visual inspection for foreign matter . 2
5.2 Determination of the mass fraction of total nitrogen . 2
5.3 Determination of the mass fraction of ureic nitrogen . 2
5.4 Determination of the mass fraction of methylene-urea reaction products nitrogen . 3
5.5 Determination of the ammonia nitrogen . 3
5.6 Determination of the nitric nitrogen. 3
5.7 Determination of the cyanamide nitrogen . 3
5.8 Determination of the biuret content . 3
5.9 Determination of the mass fraction of water insoluble matter . 3
5.10 Determination of the density . 3
6 Sampling and preparation of test sample . 3
6.1 Sampling method . 3
6.2 Test sample preparation . 3
7 Marking and labelling . 3
8 Packaging, transport and storage . 4
Bibliography . 5
© ISO 2022 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/FDIS 6181:2022(E)
methylenemethylenemethyleneForeword
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction
and/or on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 134, Fertilizers, soil conditioners and
beneficial substances.
Any feedback or questions on this document should be directed to the user’s national standards body.
A complete listing of these bodies can be found at www.iso.org/members.html.
iv © ISO 2022 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/FDIS 6181:2022(E)
Introduction
Liquid methylene-urea slow release fertilizers are chemically synthesized nitrogen fertilizers with
slow release effect.
For facilitatingTo facilitate int
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 6181
ISO/TC 134
Fertilizers and soil conditioners —
Secretariat: INSO
Liquid methylen-urea slow release
Voting begins on:
2022-12-22 fertilizers — General requirements
Voting terminates on:
Engrais et amendements — Engrais liquides à libération lente à base
2023-02-16
de méthylène-urée — Exigences générales
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 6181:2022(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2022

---------------------- Page: 1 ----------------------
ISO/FDIS 6181:2022(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 6181
ISO/TC 134
Fertilizers and soil conditioners —
Secretariat: INSO
Liquid methylen-urea slow release
Voting begins on:
fertilizers — General requirements
Voting terminates on:
Engrais et amendements — Engrais liquides à libération lente à base
de méthylène-urée — Exigences générales
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 6181:2022(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2022 – All rights reserved
NATIONAL REGULATIONS. © ISO 2022

---------------------- Page: 2 ----------------------
ISO/FDIS 6181:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Visual inspection . 2
4.2 Requirements of liquid methylene-urea slow release fertilizers . 2
5 Analytical methods . 2
5.1 Visual inspection for foreign matter . 2
5.2 Determination of the mass fraction of total nitrogen . 2
5.3 Determination of the mass fraction of ureic nitrogen . 2
5.4 Determination of the mass fraction of methylene-urea reaction products nitrogen . 2
5.5 Determination of the ammonia nitrogen . 3
5.6 Determination of the nitric nitrogen . 3
5.7 Determination of the cyanamide nitrogen . 3
5.8 Determination of the biuret content . 3
5.9 Determination of the mass fraction of water insoluble matter . 3
5.10 Determination of the density. 3
6 Sampling and preparation of test sample . 3
6.1 Sampling method . 3
6.2 Test sample preparation . 3
7 Marking and labelling . 3
8 Packaging, transport and storage .4
Bibliography . 5
iii
© ISO 2022 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/FDIS 6181:2022(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 the right to be represented on that committee. International
organizations, governmental and non­governmental, 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information gi
...