Determination of span rating for natural fibre-reinforced plastic composite (NFC) deck boards

ISO 19821:2017 specifies the procedures to establish a span rating for natural fibre-reinforced plastic composite (NFC) deck boards and deck boards used as stair treads, provided that the stair treads are produced from the same materials and processing techniques as the deck boards. This document covers test methods of performance, acceptance criteria and determination of span rating. It is intended to establish the basis for code recognition of deck boards used in exterior applications where combustible construction is allowed.

Détermination de la portée nominale des lames de platelage en composite plastique renforcé de fibres naturelles (NFC)

General Information

Status
Published
Publication Date
03-Dec-2017
Current Stage
9093 - International Standard confirmed
Completion Date
29-Jul-2022
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ISO 19821:2017 - Determination of span rating for natural fibre-reinforced plastic composite (NFC) deck boards
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INTERNATIONAL ISO
STANDARD 19821
First edition
2017-11
Determination of span rating for
natural fibre-reinforced plastic
composite (NFC) deck boards
Détermination de la portée nominale des lames de platelage en
composite plastique renforcé de fibres naturelles (NFC)
Reference number
ISO 19821:2017(E)
ISO 2017
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ISO 19821:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

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ii © ISO 2017 – All rights reserved
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ISO 19821:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Test specimen .......................................................................................................................................................................................................... 2

5 Sampling ........................................................................................................................................................................................................................ 2

6 Conditioning .............................................................................................................................................................................................................. 2

7 Evaluation methods of performance ............................................................................................................................................... 2

7.1 General ........................................................................................................................................................................................................... 2

7.2 Temperature and moisture effects ......................................................................................................................................... 2

7.2.1 Temperature effect ......................................................................................................................................................... 2

7.2.2 Moisture effect ................................................................................................................................................................... 3

7.2.3 Acceptance criteria ........................................................................................................................................................ 3

7.3 Weatherproofing ................................................................................................................................................................................... 3

7.3.1 Test method .......................................................................................................................................................................... 3

7.3.2 Acceptance criteria ........................................................................................................................................................ 3

7.4 Freeze-thaw resistance .................................................................................................................................................................... 4

7.4.1 Test method .......................................................................................................................................................................... 4

7.4.2 Acceptance criteria ........................................................................................................................................................ 4

7.5 Biodeterioration .................................................................................................................................................................................... 4

7.5.1 General...................................................................................................................................................................................... 4

7.5.2 Fungal decay resistance ............................................................................................................................................. 4

7.5.3 Termites ................................................................................................................................................................................... 4

7.6 Creep-recovery ........................................................................................................................................................................................ 5

7.6.1 Test method .......................................................................................................................................................................... 5

7.6.2 Acceptance criterion ..................................................................................................................................................... 5

7.7 Creep-rupture .......................................................................................................................................................................................... 5

7.7.1 Test method .......................................................................................................................................................................... 5

7.7.2 Acceptance criterion ..................................................................................................................................................... 5

7.8 Mechanical fastener holding ....................................................................................................................................................... 5

7.9 Slip resistance .......................................................................................................................................................................................... 6

8 Determination of span rating .................................................................................................................................................................. 6

8.1 Deck board span rating .................................................................................................................................................................... 6

8.2 Two-span adjustment ....................................................................................................................................................................... 6

9 Report .............................................................................................................................................................................................................................. 7

9.1 Test report ................................................................................................................................................................................................... 7

9.2 Product description ............................................................................................................................................................................ 7

9.3 Installation instructions .................................................................................................................................................................. 7

Annex A (informative) Adjustment factor — Examples .................................................................................................................... 8

Annex B (normative) Two-span test method ............................................................................................................................................... 9

Bibliography .............................................................................................................................................................................................................................10

© ISO 2017 – All rights reserved iii
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ISO 19821:2017(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 on 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 the following

URL: www.iso.org/iso/foreword.html

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11,

Products.
iv © ISO 2017 – All rights reserved
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ISO 19821:2017(E)
Introduction

Natural fibre-reinforced plastic composites (NFC) are made of one or several cellulosic materials

combined with one or several thermoplastics. Currently, cellulosic materials mainly come from

different natural plant sources and the most common thermoplastics, including virgin and recycled

forms, are polyethylene, polypropylene and polyvinyl chloride. In the past, these composites used to be

called wood plastic composites (WPC). In this document, NFC is used instead of WPC, in line with the

terminology used in ISO 16616.

The production of NFC in the thermoplastics industry has gained much acceptance in recent years and

is expected to keep growing rapidly. This type of composite material has become an important family

of engineering materials due to the increasing need for sustainable and biodegradable renewable

materials, which are known as “green composites.” NFC has sustainable character due to the presence

of wood as a natural component, which enables environmental protection and minimization of waste

formation. Such materials offer significant advantages which justify their use.

NFC has recently found wide applications in construction and decoration areas including decking,

fencing, flooring, landscaping, railings, window framing, and roof tiles. Meanwhile it is also applied for

packaging, automotive industries, furniture and other items.

For deck boards used in outdoor environments, some performance measurements, such as temperature

and moisture effects, ultraviolet resistance, freeze-thaw resistance, etc., are used in the determination

of the span rating in order to assist in the proper installation and using. However, due to the lack of

a unified testing method to evaluate a span rating indicating the board’s ability to comply with

functions identified for its specific end use, therefore, it would be required to establish an ISO standard

for removing the barriers of deck boards in the application and sales, and encouraging technology

development in the NFC production field.
© ISO 2017 – All rights reserved v
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INTERNATIONAL STANDARD ISO 19821:2017(E)
Determination of span rating for natural fibre-reinforced
plastic composite (NFC) deck boards
1 Scope

This document specifies the procedures to establish a span rating for natural fibre-reinforced plastic

composite (NFC) deck boards and deck boards used as stair treads, provided that the stair treads are

produced from the same materials and processing techniques as the deck boards. This document covers

test methods of performance, acceptance criteria and determination of span rating. It is intended to

establish the basis for code recognition of deck boards used in exterior applications where combustible

construction is allowed.
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 291, Plastics — Standard atmospheres for conditioning and testing

ISO 4892-2:2013, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps

ISO 16616:2015, Test methods for natural fibre-reinforced plastic composite (NFC) deck boards

EN 15534-1:2014, Composites made from cellulose-based materials and thermoplastics (usually

called wood-polymer composites (WPC) or natural fibre composites (NFC)) — Part 1: Test methods for

characterization of compounds and products

ASTM D7032-17, Standard Specification for Establishing Performance Ratings for Wood-Plastic Composite

and Plastic Lumber Deck Boards, Stair Treads, Guards, and Handrails
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:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
natural fibre-reinforced plastic composite
NFC

product made thereof being the result of the combination of one or several cellulosic materials with one

or several thermoplastics
3.2
flexural strength

maximum load achieved by the test specimen during flexural test, and reported as modulus of

rupture (MOR)
© ISO 2017 – All rights reserved 1
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ISO 19821:2017(E)
3.3
flexural stiffness

value calculated from a linear least squares fit of the stress-strain curve over the range of 10 % to 40

% of ultimate stress, and reported as either modulus of elastic (MOE) or MOE × moment of inertia (EI)

Note 1 to entry: If the cross-section of deck boards is complicated to calculate moment of inertia, it is better to

use EI to indicate flexural stiffness.
3.4
span rating
maximum centre-to-centre support spacing for the specified end use
4 Test specimen

Test specimens with the original thickness and width of the product are used in the tests unless

otherwise specified. In general, test specimens of the product are rectangular in cross-section for deck

boards and stair treads.
5 Sampling

It is important to select test specimens that reflect the variability of the population. It is essential to

consider batch-to-batch and shift-to-shift variability when sampling actual production. Test specimens

shall be selected from several production runs of a given item.
6 Conditioning
Prior to testing, all specimens shall be conditioned to
...

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