ISO 19624:2018
(Main)Bamboo structures — Grading of bamboo culms — Basic principles and procedures
Bamboo structures — Grading of bamboo culms — Basic principles and procedures
This document specifies grading procedures for visually and mechanically sorting round, or pole, bamboo for structural applications using such fundamental elements. Visual sorting is based on observable characteristics of the piece(s). Mechanical sorting is based on non-destructive measurement of properties known to correlate to characteristic values defining a grade. The grading procedures in this document can be used in a quality acceptance regime, although this document does not define or address acceptance criteria. This document is applicable only for bamboo that is graded in the seasoned state.
Structures en bambou — Classement des tiges de bambou
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INTERNATIONAL ISO
STANDARD 19624
First edition
2018-09
Bamboo structures — Grading of
bamboo culms — Basic principles and
procedures
Structures en bambou — Classement des tiges de bambou
Reference number
©
ISO 2018
© ISO 2018
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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 4
5 General . 4
5.1 Grading. 4
5.2 Grades . 4
5.3 Graded bamboo culms . 5
5.4 Grading operations . 5
5.5 Secondary properties . 5
6 Visual grading . 5
6.1 General . 5
6.2 Visual grading requirements . 5
6.2.1 General. 5
6.2.2 Condition properties . 6
6.2.3 Geometric properties . 7
6.3 Other requirements for visual grading .10
6.3.1 Moisture content .10
6.3.2 Age at harvesting .10
6.4 Check on visual grading process .11
7 Machine grading.11
7.1 General .11
7.2 Machine grading process requirements .11
7.3 Indicating properties .11
7.4 Grade-determining properties .12
7.5 Visual override .12
7.6 Hybrid grading methods .12
8 Structural properties of graded bamboo .12
8.1 General .12
8.2 Initial evaluation .12
8.2.1 Developing visual grading rules .13
8.2.2 Developing grading settings for machine grading .13
8.2.3 Sampling.13
8.2.4 Sample size for initial evaluation .14
8.2.5 Other considerations during initial evaluation testing .14
8.3 Periodic evaluation .14
8.4 Reduced test programmes and secondary properties .15
9 Product identification .15
10 Documentation .15
Annex A (informative) Example of application of clauses in this document to a visual
grading standard for bamboo culms based on external diameter and flexural properties 16
Bibliography .22
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 ISO Technical Committee 165, Timber structures.
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 2018 – All rights reserved
Introduction
The general principle of this document is that any type of grading procedure is acceptable, provided it is
defined, controlled, and documented to the extent required to achieve the degree of reliability intended
for the structural application of the product. This document specifies procedures that conform to
this principle. The grading procedures outlined in this document require visual, dimensional and
mechanical stages to ensure conformity.
Annex A provides an example conformance standard reflecting the requirements of this document.
INTERNATIONAL STANDARD ISO 19624:2018(E)
Bamboo structures — Grading of bamboo culms — Basic
principles and procedures
1 Scope
This document specifies grading procedures for visually and mechanically sorting round, or pole,
bamboo for structural applications using such fundamental elements. Visual sorting is based on
observable characteristics of the piece(s). Mechanical sorting is based on non-destructive measurement
of properties known to correlate to characteristic values defining a grade.
The grading procedures in this document can be used in a quality acceptance regime, although this
document does not define or address acceptance criteria.
This document is applicable only for bamboo that is graded in the seasoned state.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 22156, Bamboo — Structural design
ISO 22157-1, Bamboo — Determination of physical and mechanical properties — Part 1: Requirements
ISO 12122-1, Timber structures — Determination of characteristic values — Part 1: Basic requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
bamboo culm
single shoot of bamboo
Note 1 to entry: A culm is comprised of the entire unaltered bamboo cross section and is usually a hollow cylinder
except at nodes.
3.2
bow
measure of variation of culm from straight condition, reported as the ratio of greatest transverse
variation to reference length of culm
3.3
dry bamboo
seasoned bamboo
bamboo that has been subjected to a drying process and with moisture content of 19 % or less
3.4
fissure
longitudinally oriented separation or split of the bamboo wall running parallel to the fibres at the end of
a culm or at any internode of the piece that may or may not penetrate through the entire wall thickness
Note 1 to entry: An example o
...
INTERNATIONAL ISO
STANDARD 19624
First edition
2018-09
Bamboo structures — Grading of
bamboo culms — Basic principles and
procedures
Structures en bambou — Classement des tiges de bambou
Reference number
©
ISO 2018
© ISO 2018
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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 4
5 General . 4
5.1 Grading. 4
5.2 Grades . 4
5.3 Graded bamboo culms . 5
5.4 Grading operations . 5
5.5 Secondary properties . 5
6 Visual grading . 5
6.1 General . 5
6.2 Visual grading requirements . 5
6.2.1 General. 5
6.2.2 Condition properties . 6
6.2.3 Geometric properties . 7
6.3 Other requirements for visual grading .10
6.3.1 Moisture content .10
6.3.2 Age at harvesting .10
6.4 Check on visual grading process .11
7 Machine grading.11
7.1 General .11
7.2 Machine grading process requirements .11
7.3 Indicating properties .11
7.4 Grade-determining properties .12
7.5 Visual override .12
7.6 Hybrid grading methods .12
8 Structural properties of graded bamboo .12
8.1 General .12
8.2 Initial evaluation .12
8.2.1 Developing visual grading rules .13
8.2.2 Developing grading settings for machine grading .13
8.2.3 Sampling.13
8.2.4 Sample size for initial evaluation .14
8.2.5 Other considerations during initial evaluation testing .14
8.3 Periodic evaluation .14
8.4 Reduced test programmes and secondary properties .15
9 Product identification .15
10 Documentation .15
Annex A (informative) Example of application of clauses in this document to a visual
grading standard for bamboo culms based on external diameter and flexural properties 16
Bibliography .22
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 ISO Technical Committee 165, Timber structures.
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 2018 – All rights reserved
Introduction
The general principle of this document is that any type of grading procedure is acceptable, provided it is
defined, controlled, and documented to the extent required to achieve the degree of reliability intended
for the structural application of the product. This document specifies procedures that conform to
this principle. The grading procedures outlined in this document require visual, dimensional and
mechanical stages to ensure conformity.
Annex A provides an example conformance standard reflecting the requirements of this document.
INTERNATIONAL STANDARD ISO 19624:2018(E)
Bamboo structures — Grading of bamboo culms — Basic
principles and procedures
1 Scope
This document specifies grading procedures for visually and mechanically sorting round, or pole,
bamboo for structural applications using such fundamental elements. Visual sorting is based on
observable characteristics of the piece(s). Mechanical sorting is based on non-destructive measurement
of properties known to correlate to characteristic values defining a grade.
The grading procedures in this document can be used in a quality acceptance regime, although this
document does not define or address acceptance criteria.
This document is applicable only for bamboo that is graded in the seasoned state.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 22156, Bamboo — Structural design
ISO 22157-1, Bamboo — Determination of physical and mechanical properties — Part 1: Requirements
ISO 12122-1, Timber structures — Determination of characteristic values — Part 1: Basic requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
bamboo culm
single shoot of bamboo
Note 1 to entry: A culm is comprised of the entire unaltered bamboo cross section and is usually a hollow cylinder
except at nodes.
3.2
bow
measure of variation of culm from straight condition, reported as the ratio of greatest transverse
variation to reference length of culm
3.3
dry bamboo
seasoned bamboo
bamboo that has been subjected to a drying process and with moisture content of 19 % or less
3.4
fissure
longitudinally oriented separation or split of the bamboo wall running parallel to the fibres at the end of
a culm or at any internode of the piece that may or may not penetrate through the entire wall thickness
Note 1 to entry: An example o
...
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