Rigid cellular plastics - Thermal insulation products for buildings - Specifications

ISO 4898:2018 specifies requirements and methods of testing for three categories of rigid cellular plastics thermal-insulation products for buildings. It covers rigid cellular plastics in the form of flat or profiled boards, with or without natural skins. They can also be faced or laminated with foil, plastic or metal films or sheets, mineral coatings, paper, cardboard or other materials.
ISO 4898:2018 is not applicable to materials used for the thermal insulation of pipes and vessels, for impact sound absorption or for acoustical insulation.
ISO 4898:2018 covers the following cellular materials used in the thermal insulation of buildings:
- PF based on phenolic polymer;
- EPS based on expanded polystyrene;
- XPS based on extruded polystyrene;
- PUR based on polyurethane.
The limiting quality values in this document are for use only in the specification of materials between purchaser and supplier, and are not intended to be used for design purposes.
Additional requirements for special applications can be added to those specified in this document by agreement between purchaser and supplier.

Plastiques alvéolaires rigides -- Produits d'isolation thermique pour bâtiments -- Spécifications

Penjeni polimerni materiali - Toplotnoizolacijski proizvodi za stavbe - Specifikacije

General Information

Status
Published
Publication Date
10-Jun-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Jun-2020
Due Date
15-Aug-2020
Completion Date
11-Jun-2020

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SLOVENSKI STANDARD
SIST ISO 4898:2020
01-september-2020

Penjeni polimerni materiali - Toplotnoizolacijski proizvodi za stavbe - Specifikacije

Rigid cellular plastics - Thermal insulation products for buildings - Specifications

Plastiques alvéolaires rigides -- Produits d'isolation thermique pour bâtiments --

Spécifications
Ta slovenski standard je istoveten z: ISO 4898:2018
ICS:
83.100 Penjeni polimeri Cellular materials
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
SIST ISO 4898:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 4898:2020
---------------------- Page: 2 ----------------------
SIST ISO 4898:2020
INTERNATIONAL ISO
STANDARD 4898
Sixth edition
2018-03
Rigid cellular plastics — Thermal
insulation products for buildings —
Specifications
Plastiques alvéolaires rigides — Produits d'isolation thermique pour
bâtiments — Spécifications
Reference number
ISO 4898:2018(E)
ISO 2018
---------------------- Page: 3 ----------------------
SIST ISO 4898:2020
ISO 4898:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
---------------------- Page: 4 ----------------------
SIST ISO 4898:2020
ISO 4898:2018(E)
Contents Page

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Sizes and dimensional-tolerance requirements .................................................................................................................. 2

5 Physical-property requirements ......................................................................................................................................................... 3

5.1 Categories .................................................................................................................................................................................................... 3

5.2 Subcategories ........................................................................................................................................................................................... 3

5.3 Limiting quality values ..................................................................................................................................................................... 4

5.4 Burning characteristics .................................................................................................................................................................... 4

6 Sampling ........................................................................................................................................................................................................................ 4

7 Conditioning .............................................................................................................................................................................................................. 4

7.1 Sample panels .......................................................................................................................................................................................... 4

8 Test methods ............................................................................................................................................................................................................. 4

8.1 Linear dimensions ............................................................................................................................................................................... 4

8.2 Density ........................................................................................................................................................................................................... 5

8.3 Compressive strength ....................................................................................................................................................................... 5

8.4 Thermal conductivity ........................................................................................................................................................................ 5

8.4.1 General...................................................................................................................................................................................... 5

8.4.2 Initial thermal conductivity .................................................................................................................................... 5

8.4.3 Long-term thermal resistance .............................................................................................................................. 5

8.5 Dimensional stability ......................................................................................................................................................................... 5

8.6 Compressive creep at elevated temperature ................................................................................................................. 6

8.7 Water vapour permeability .......................................................................................................................................................... 6

8.8 Water absorption .................................................................................................................................................................................. 6

8.9 Bending load at break ....................................................................................................................................................................... 6

9 Conformity control ............................................................................................................................................................................................. 6

10 Labelling and marking of products ................................................................................................................................................... 6

11 Reporting requirements ............................................................................................................................................................................... 7

Annex A (normative) Amendments to ISO 12576-1 ..........................................................................................................................11

Bibliography .............................................................................................................................................................................................................................13

© ISO 2018 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 4898:2020
ISO 4898:2018(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 10, Cellular

plastics.

This sixth edition cancels and replaces the fifth edition (ISO 4898:2010), of which it constitutes a minor

revision.
The changes compared to the previous edition are as follows:
— product Category IV has been removed as this type of product is not made.
iv © ISO 2018 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 4898:2020
INTERNATIONAL STANDARD ISO 4898:2018(E)
Rigid cellular plastics — Thermal insulation products for
buildings — Specifications
1 Scope

This document specifies requirements and methods of testing for three categories of rigid cellular

plastics thermal-insulation products for buildings. It covers rigid cellular plastics in the form of flat or

profiled boards, with or without natural skins. They can also be faced or laminated with foil, plastic or

metal films or sheets, mineral coatings, paper, cardboard or other materials.

This document is not applicable to materials used for the thermal insulation of pipes and vessels, for

impact sound absorption or for acoustical insulation.

This document covers the following cellular materials used in the thermal insulation of buildings:

— PF based on phenolic polymer;
— EPS based on expanded polystyrene;
— XPS based on extruded polystyrene;
— PUR based on polyurethane.

The limiting quality values in this document are for use only in the specification of materials between

purchaser and supplier, and are not intended to be used for design purposes.

Additional requirements for special applications can be added to those specified in this document by

agreement between purchaser and supplier.
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 844, Rigid cellular plastics — Determination of compression properties
ISO 845, Cellular plastics and rubbers — Determination of apparent density

ISO 1040, Building construction — Modular coordination — Multimodules for horizontal coordinating

dimensions

ISO 1209-1, Rigid cellular plastics — Determination of flexural properties — Part 1: Basic bending test

ISO 1663, Rigid cellular plastics — Determination of water vapour transmission properties

ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
ISO 2796, Cellular plastics, rigid — Test for dimensional stability
ISO 2896, Rigid cellular plastics — Determination of water absorption

ISO 7616, Cellular plastics, rigid — Determination of compressive creep under specified load and

temperature conditions
© ISO 2018 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 4898:2020
ISO 4898:2018(E)
ISO 7850, Cellular plastics, rigid — Determination of compressive creep

ISO 8301, Thermal insulation — Determination of steady-state thermal resistance and related properties —

Heat flow meter apparatus

ISO 8302, Thermal insulation — Determination of steady-state thermal resistance and related properties —

Guarded hot plate apparatus

ISO 11561, Ageing of thermal insulation materials — Determination of the long-term change in thermal

resistance of closed-cell plastics (accelerated laboratory test methods)

ISO 12576-1:2001, Thermal insulation — Insulating materials and products for buildings — Conformity

control systems — Part 1: Factory-made products
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 https:// www .iso .org/ obp
3.1
EPS

rigid cellular plastics insulation material manufactured by moulding beads of expandable polystyrene

or one of its copolymers and that has a substantially closed-cell structure, filled with air

[SOURCE: ISO 9229]
3.2
XPS

rigid cellular plastics insulation material expanded and extruded with or without a skin from

polystyrene or one of its copolymers and that has a closed-cell structure
[SOURCE: ISO 9229]
3.3
PUR

rigid cellular plastics insulation material with a substantially closed-cell structure based on

polyurethane or urethane/isocyanurate polymers

Note 1 to entry: For definitions of polyisocyanurate plastic, polyurethane and urethane plastic, see ISO 472.

3.4

rigid cellular insulation foam, the polymer structure of which is made primarily from the

polycondensation of phenol, its homologues and/or derivatives with aldehydes or ketones

Note 1 to entry: PF used for thermal-insulation purposes has a cellular structure consisting substantially of

closed cells (subcategory A) or with a higher content of open cells (subcategory B) which affects the thermal

conductivity.
[SOURCE: ISO 9229, modified – Note 1 to entry has been added.]
4 Sizes and dimensional-tolerance requirements

4.1 Board materials shall be supplied in dimensions agreed between purchaser and supplier or in

accordance with ISO 1040. Boards shall be flat.
2 © ISO 2018 – All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 4898:2020
ISO 4898:2018(E)

4.2 Dimensional tolerances for length, width and squareness shall conform to the requirements

specified in Table 1.
Table 1 — Tolerances for dimensions and squareness
Squareness tolerances
based on differences
Length or width Tolerance on length or width
in diagonal measure-
b c
ments
mm mm mm
<1 000 ±8 5
≥1 000 ±10 5

If more restrictive tolerances are required, these shall be agreed between purchaser and supplier.

Tolerance categories for diagonal measurements are based on the board length (not width).

Squareness may also be determined by equivalent methods such as the use of a rectangular pattern.

4.3 Dimensional tolerances for thickness shall conform to the requirements specified in Table 2.

Table 2 — Tolerances for thickness
Thickness Tolerance
mm mm
<50 ±2
50 to 75 (incl.) ±3
>75 to 100 (incl.) ±3
>100 To be agreed between purchaser and supplier

If more restrictive tolerances are required, these shall be agreed between purchaser and supplier.

For EPS with natural skins, the thickness tolerance for this thickness category shall be ±4 mm.

5 Physical-property requirements
5.1 Categories

Physical-property requirements are organized into product categories to meet purchaser and supplier

needs over a range of end-use applications.

Category I — Suitable for non-load-bearing applications such as wall and cavity insulation, vented

roofs, cavity wall insulation and similar applications.

Category II — Suitable for limited load-bearing applications such as in built-up roofs, under floors and

comparable applications, where elevated temperatures may be encountered and where compressive

creep resistance is required. Products in this category may also be used for applications listed in

category I.

Category III — Suitable for load-bearing applications such as in parking decks, floors of cold-storage

areas and comparable applications requiring a higher level of compressive strength and compressive

creep resistance. Products in this category may also be used for applications listed in categories I and II.

5.2 Subcategories
Product property categories I to III can be furth
...

INTERNATIONAL ISO
STANDARD 4898
Sixth edition
2018-03
Rigid cellular plastics — Thermal
insulation products for buildings —
Specifications
Plastiques alvéolaires rigides — Produits d'isolation thermique pour
bâtiments — Spécifications
Reference number
ISO 4898:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 4898:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
---------------------- Page: 2 ----------------------
ISO 4898:2018(E)
Contents Page

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Sizes and dimensional-tolerance requirements .................................................................................................................. 2

5 Physical-property requirements ......................................................................................................................................................... 3

5.1 Categories .................................................................................................................................................................................................... 3

5.2 Subcategories ........................................................................................................................................................................................... 3

5.3 Limiting quality values ..................................................................................................................................................................... 4

5.4 Burning characteristics .................................................................................................................................................................... 4

6 Sampling ........................................................................................................................................................................................................................ 4

7 Conditioning .............................................................................................................................................................................................................. 4

7.1 Sample panels .......................................................................................................................................................................................... 4

8 Test methods ............................................................................................................................................................................................................. 4

8.1 Linear dimensions ............................................................................................................................................................................... 4

8.2 Density ........................................................................................................................................................................................................... 5

8.3 Compressive strength ....................................................................................................................................................................... 5

8.4 Thermal conductivity ........................................................................................................................................................................ 5

8.4.1 General...................................................................................................................................................................................... 5

8.4.2 Initial thermal conductivity .................................................................................................................................... 5

8.4.3 Long-term thermal resistance .............................................................................................................................. 5

8.5 Dimensional stability ......................................................................................................................................................................... 5

8.6 Compressive creep at elevated temperature ................................................................................................................. 6

8.7 Water vapour permeability .......................................................................................................................................................... 6

8.8 Water absorption .................................................................................................................................................................................. 6

8.9 Bending load at break ....................................................................................................................................................................... 6

9 Conformity control ............................................................................................................................................................................................. 6

10 Labelling and marking of products ................................................................................................................................................... 6

11 Reporting requirements ............................................................................................................................................................................... 7

Annex A (normative) Amendments to ISO 12576-1 ..........................................................................................................................11

Bibliography .............................................................................................................................................................................................................................13

© ISO 2018 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 4898:2018(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 10, Cellular

plastics.

This sixth edition cancels and replaces the fifth edition (ISO 4898:2010), of which it constitutes a minor

revision.
The changes compared to the previous edition are as follows:
— product Category IV has been removed as this type of product is not made.
iv © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 4898:2018(E)
Rigid cellular plastics — Thermal insulation products for
buildings — Specifications
1 Scope

This document specifies requirements and methods of testing for three categories of rigid cellular

plastics thermal-insulation products for buildings. It covers rigid cellular plastics in the form of flat or

profiled boards, with or without natural skins. They can also be faced or laminated with foil, plastic or

metal films or sheets, mineral coatings, paper, cardboard or other materials.

This document is not applicable to materials used for the thermal insulation of pipes and vessels, for

impact sound absorption or for acoustical insulation.

This document covers the following cellular materials used in the thermal insulation of buildings:

— PF based on phenolic polymer;
— EPS based on expanded polystyrene;
— XPS based on extruded polystyrene;
— PUR based on polyurethane.

The limiting quality values in this document are for use only in the specification of materials between

purchaser and supplier, and are not intended to be used for design purposes.

Additional requirements for special applications can be added to those specified in this document by

agreement between purchaser and supplier.
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 844, Rigid cellular plastics — Determination of compression properties
ISO 845, Cellular plastics and rubbers — Determination of apparent density

ISO 1040, Building construction — Modular coordination — Multimodules for horizontal coordinating

dimensions

ISO 1209-1, Rigid cellular plastics — Determination of flexural properties — Part 1: Basic bending test

ISO 1663, Rigid cellular plastics — Determination of water vapour transmission properties

ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
ISO 2796, Cellular plastics, rigid — Test for dimensional stability
ISO 2896, Rigid cellular plastics — Determination of water absorption

ISO 7616, Cellular plastics, rigid — Determination of compressive creep under specified load and

temperature conditions
© ISO 2018 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 4898:2018(E)
ISO 7850, Cellular plastics, rigid — Determination of compressive creep

ISO 8301, Thermal insulation — Determination of steady-state thermal resistance and related properties —

Heat flow meter apparatus

ISO 8302, Thermal insulation — Determination of steady-state thermal resistance and related properties —

Guarded hot plate apparatus

ISO 11561, Ageing of thermal insulation materials — Determination of the long-term change in thermal

resistance of closed-cell plastics (accelerated laboratory test methods)

ISO 12576-1:2001, Thermal insulation — Insulating materials and products for buildings — Conformity

control systems — Part 1: Factory-made products
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 https:// www .iso .org/ obp
3.1
EPS

rigid cellular plastics insulation material manufactured by moulding beads of expandable polystyrene

or one of its copolymers and that has a substantially closed-cell structure, filled with air

[SOURCE: ISO 9229]
3.2
XPS

rigid cellular plastics insulation material expanded and extruded with or without a skin from

polystyrene or one of its copolymers and that has a closed-cell structure
[SOURCE: ISO 9229]
3.3
PUR

rigid cellular plastics insulation material with a substantially closed-cell structure based on

polyurethane or urethane/isocyanurate polymers

Note 1 to entry: For definitions of polyisocyanurate plastic, polyurethane and urethane plastic, see ISO 472.

3.4

rigid cellular insulation foam, the polymer structure of which is made primarily from the

polycondensation of phenol, its homologues and/or derivatives with aldehydes or ketones

Note 1 to entry: PF used for thermal-insulation purposes has a cellular structure consisting substantially of

closed cells (subcategory A) or with a higher content of open cells (subcategory B) which affects the thermal

conductivity.
[SOURCE: ISO 9229, modified – Note 1 to entry has been added.]
4 Sizes and dimensional-tolerance requirements

4.1 Board materials shall be supplied in dimensions agreed between purchaser and supplier or in

accordance with ISO 1040. Boards shall be flat.
2 © ISO 2018 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 4898:2018(E)

4.2 Dimensional tolerances for length, width and squareness shall conform to the requirements

specified in Table 1.
Table 1 — Tolerances for dimensions and squareness
Squareness tolerances
based on differences
Length or width Tolerance on length or width
in diagonal measure-
b c
ments
mm mm mm
<1 000 ±8 5
≥1 000 ±10 5

If more restrictive tolerances are required, these shall be agreed between purchaser and supplier.

Tolerance categories for diagonal measurements are based on the board length (not width).

Squareness may also be determined by equivalent methods such as the use of a rectangular pattern.

4.3 Dimensional tolerances for thickness shall conform to the requirements specified in Table 2.

Table 2 — Tolerances for thickness
Thickness Tolerance
mm mm
<50 ±2
50 to 75 (incl.) ±3
>75 to 100 (incl.) ±3
>100 To be agreed between purchaser and supplier

If more restrictive tolerances are required, these shall be agreed between purchaser and supplier.

For EPS with natural skins, the thickness tolerance for this thickness category shall be ±4 mm.

5 Physical-property requirements
5.1 Categories

Physical-property requirements are organized into product categories to meet purchaser and supplier

needs over a range of end-use applications.

Category I — Suitable for non-load-bearing applications such as wall and cavity insulation, vented

roofs, cavity wall insulation and similar applications.

Category II — Suitable for limited load-bearing applications such as in built-up roofs, under floors and

comparable applications, where elevated temperatures may be encountered and where compressive

creep resistance is required. Products in this category may also be used for applications listed in

category I.

Category III — Suitable for load-bearing applications such as in parking decks, floors of cold-storage

areas and comparable applications requiring a higher level of compressive strength and compressive

creep resistance. Products in this category may also be used for applications listed in categories I and II.

5.2 Subcategories

Product property categories I to III can be further divided into subcategories (A, B, C) on the basis of

thermal-conductivity values. All thermal-conductivity specification values given for the subcategories

in the tables are maximum values.
© ISO 2018 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 4898:2018(E)

Thermal-conductivity values given in the tables shall be used only as limiting quality values for

specification of materials between pu
...

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