kSIST FprEN 1860-2:2023

Appliances, solid fuels and firelighters for barbecuing - Part 2: Barbecue charcoal and barbecue charcoal briquettes - Requirements and test methods

This document specifies the requirements and test methods for barbecue charcoal and barbecue charcoal briquettes for use in barbecue appliances.
This document is intended to reduce the risks which can occur during and through barbecuing with solid fuels.
Barbecue charcoal in accordance with this document refers to the solid remainder of dry distillation of wood or other vegetable matter.

Geräte, feste Brennstoffe und Anzündhilfen zum Grillen - Teil 2: Grill-Holzkohle und Grill-Holzkohlebriketts - Anforderungen und Prüfverfahren

Dieses Dokument legt Anforderungen an Grill-Holzkohle und Grill-Holzkohlebriketts zur Verwendung in Grillgeräten sowie dazugehörige Prüfverfahren fest.
Das Dokument ist dafür vorgesehen, Risiken zu mindern, die während des Grillens selbst sowie infolge des Grillens mit festen Brennstoffen auftreten können.
Grill-Holzkohle in Übereinstimmung mit diesem Dokument bezieht sich auf den festen Rückstand aus der trockenen Destillation von Holz oder sonstigen pflanzlichen Bestandteilen (Materie).

Appareils, combustibles solides et allume-feu pour la cuisson au barbecue - Partie 2 : Charbon de bois et briquettes de charbon de bois pour barbecue - Exigences et méthodes d’essai

Le présent document spécifie les exigences et les méthodes d’essai relatives au charbon de bois et aux briquettes de charbon de bois destinés à la cuisson au barbecue.
Le présent document vise à réduire les risques qui peuvent survenir tout au long de la cuisson au barbecue avec des combustibles solides.
Le charbon de bois pour barbecue conformément au présent document désigne le résidu solide de la distillation sèche de bois ou d’une autre matière végétale.

Naprave, trdna goriva in naprave za vžiganje žara - 2. del: Lesno oglje in briketi lesnega oglja za žar - Zahteve in preskusne metode

General Information

• Status: Not Published
• Public Enquiry End Date: 30-Jun-2022
• ICS: 75.160.10 - Solid fuels
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: OGS - Heating for buildings
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 09-Mar-2023
• Due Date: 27-Apr-2023
• Completion Date: 14-Mar-2023
• Ref Project: FprEN 1860-2 - Appliances, solid fuels and firelighters for barbecuing - Part 2: Barbecue charcoal and barbecue charcoal briquettes - Requirements and test methods

Relations

• Revised: SIST EN 1860-2:2005 - Appliances, solid fuels and firelighters for barbecueing - Part 2: Barbecue charcoal and barbecue charcoal briquettes - Requirements and test methods
• Effective Date: 03-Feb-2021
• Revised: SIST EN 1860-2:2005 - Appliances, solid fuels and firelighters for barbecueing - Part 2: Barbecue charcoal and barbecue charcoal briquettes - Requirements and test methods
• Effective Date: 18-Jan-2023
• Revised: SIST EN 1860-2:2005 - Appliances, solid fuels and firelighters for barbecueing - Part 2: Barbecue charcoal and barbecue charcoal briquettes - Requirements and test methods
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 1860-2:2022
01-junij-2022

Naprave, trdna goriva in naprave za vžiganje žara - 2. del: Lesno oglje in briketi

lesnega oglja za žar - Zahteve in preskusne metode

Appliances, solid fuels and firelighters for barbecuing - Part 2: Barbecue charcoal and

barbecue charcoal briquettes - Requirements and test methods

Geräte, feste Brennstoffe und Anzündhilfen zum Grillen - Teil 2: Grill-Holzkohle und Grill-

Holzkohlebriketts - Anforderungen und Prüfverfahren

Appareils, combustibles solides et allume-feu pour la cuisson au barbecue - Partie 2 :

Charbon de bois et briquettes de charbon de bois pour barbecue - Exigences et
méthodes d’essai
Ta slovenski standard je istoveten z: prEN 1860-2
ICS:
75.160.10 Trda goriva Solid fuels
97.040.20 Štedilniki, delovni pulti, Cooking ranges, working
pečice in podobni aparati tables, ovens and similar
appliances
oSIST prEN 1860-2:2022 en,fr,de

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

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oSIST prEN 1860-2:2022
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oSIST prEN 1860-2:2022
DRAFT
EUROPEAN STANDARD
prEN 1860-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2022
ICS 75.160.10 Will supersede EN 1860-2:2005
English Version
Appliances, solid fuels and firelighters for barbecuing -
Part 2: Barbecue charcoal and barbecue charcoal
briquettes - Requirements and test methods

Appareils, combustibles solides et allume-feu pour la Geräte, feste Brennstoffe und Anzündhilfen zum Grillen

cuisson au barbecue - Partie 2 : Charbon de bois et - Teil 2: Grill-Holzkohle und Grill-Holzkohlebriketts -

briquettes de charbon de bois pour barbecue - Anforderungen und Prüfverfahren
Exigences et méthodes d'essai

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 281.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

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 supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1860-2:2022 E

worldwide for CEN national Members.
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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Requirements ................................................................................................................................................... 8

4.1 Requirements for barbecue charcoal ...................................................................................................... 8

4.1.1 Fixed carbon ...................................................................................................................................................... 8

4.1.2 Ash content ........................................................................................................................................................ 8

4.1.3 Total moisture .................................................................................................................................................. 8

4.1.4 Granulation ....................................................................................................................................................... 8

4.2 Requirements for barbecue charcoal briquettes ................................................................................ 9

4.2.1 Fixed carbon ...................................................................................................................................................... 9

4.2.2 Ash content ........................................................................................................................................................ 9

4.2.3 Total moisture .................................................................................................................................................. 9

4.2.4 Granulation ....................................................................................................................................................... 9

4.2.5 Binder .................................................................................................................................................................. 9

4.3 Impregnated barbecue charcoal and impregnated barbecue charcoal briquettes ................ 9

4.4 Inadmissible additions .................................................................................................................................. 9

4.4.1 Foreign substances ......................................................................................................................................... 9

4.4.2 Microscopic analysis ...................................................................................................................................... 9

4.4.3 Chemical burning sustainers ................................................................................................................... 10

5 Sampling .......................................................................................................................................................... 10

5.1 Sampling for granulometry ...................................................................................................................... 10

5.2 Sampling for testing ash, moisture, volatile and microscopic analyses ................................... 10

6 Test methods ................................................................................................................................................. 10

6.1 Fixed carbon ................................................................................................................................................... 10

6.2 Volatiles ........................................................................................................................................................... 10

6.3 Ash content ..................................................................................................................................................... 10

6.4 Total moisture ............................................................................................................................................... 11

6.5 Inadmissible additions ............................................................................................................................... 11

6.6 Granulometry ................................................................................................................................................ 11

6.7 Determination of impregnant content ................................................................................................. 11

6.8 Test report ...................................................................................................................................................... 11

7 Marking ............................................................................................................................................................ 12

7.1 Consumer communication on barbecue charcoal bags and barbecue charcoal

briquettes bags ............................................................................................................................................. 12

7.2 Consumer communication on impregnated barbecue charcoal bags ....................................... 12

7.2.1 Consumer instructions on “just light the bag” products ................................................................ 12

7.2.2 Consumer instructions on “just light the charcoal” products ...................................................... 13

Annex A (informative) Determination of the volume of barbecue charcoal .......................................... 16

A.1 General ............................................................................................................................................................. 16

A.2 Principle .......................................................................................................................................................... 16

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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)

A.3 Appliances ....................................................................................................................................................... 16

A.4 Sampling .......................................................................................................................................................... 16

A.5 Method of operation .................................................................................................................................... 16

A.6 Result of determination ............................................................................................................................. 16

Annex B (normative) Determination of moisture content for impregnated barbecue

charcoal and for impregnated barbecue charcoal briquettes ...................................................... 17

B.1 General ............................................................................................................................................................. 17

B.2 Principle ........................................................................................................................................................... 17

B.3 Reagents ........................................................................................................................................................... 17

B.4 Apparatus ........................................................................................................................................................ 17

B.5 Preparation of sample ................................................................................................................................ 18

B.6 Procedure ........................................................................................................................................................ 18

B.6.1 Calibration of apparatus ............................................................................................................................ 18

B.6.2 Test portion .................................................................................................................................................... 19

B.6.3 Determination................................................................................................................................................ 19

B.7 Expression of results ................................................................................................................................... 19

B.8 Precision of the method ............................................................................................................................. 20

B.8.1 Repeatability .................................................................................................................................................. 20

B.8.2 Reproducibility .............................................................................................................................................. 20

B.9 Test report ...................................................................................................................................................... 20

Bibliography ................................................................................................................................................................. 21

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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)
European foreword

This document (prEN 1860-2:2022) has been prepared by Technical Committee CEN/TC 281

“Appliances, solid fuels and firelighters for barbecuing”, the secretariat of which is held by UNE.

This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1860-2:2005.

In comparison with the previous edition EN 1860-2:2005, the following technical modifications have

been made:
a) the Introduction has been removed;

b) Clause 1, Scope, has been updated – the second and the third paragraphs have been added;

c) Clause 2, Normative references, has been updated;
d) Clause 3, Terms and definitions, has been revised and new terms were added;
e) Clause 4, Requirements, has been revised and partly reorganised, so that

— requirements on impregnated barbecue charcoal and impregnated barbecue charcoal

briquettes are now specified in 4.3;

— specifications on granulation now differentiate between barbecue charcoal, table grill charcoal

and restaurant charcoal;
— the section on volatiles has been removed;
— requirements regarding bulk density have been removed;
— requirements on inadmissible additions have been technically revised;
f) Clause 5, Sampling, has been revised and shortened;
g) Clause 6, Test methods, has been revised and shortened;

h) Clause 7, Marking, has been revised, a note referring to the CLP-Regulation (Regulation (EC)

No 1272/2008) and Figure 1 has been added;

i) Annex A has been changed from normative to informative and A.7 (Inspection certificate) has been

removed;

A list of all parts in the EN 1860 series, published under the general title Appliances, solid fuels and

firelighters for barbecuing, can be found on the CEN website.
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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)
1 Scope

This document specifies the requirements and test methods for barbecue charcoal and barbecue

charcoal briquettes for use in barbecue appliances.

This document is intended to reduce the risks which can occur during and through barbecuing with

solid fuels.

Barbecue charcoal in accordance with this document refers to the solid remainder of dry distillation of

wood or other vegetable matter.
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.

prEN 1860-3:2022, Appliances, solid fuels and firelighters for barbecuing — Part 3: Firelighters for

igniting solid fuels for use in barbecues and grill applications — Requirements and test methods

ISO 562, Hard coal and coke — Determination of volatile matter
ISO 589, Hard coal — Determination of total moisture

ISO 975, Brown coals and lignites — Determination of yield of benzene-soluble extract — Semi-automatic

method
ISO 1171, Solid mineral fuels — Determination of ash
ISO 1953, Hard coal — Size analysis by sieving
ISO/DIS 18283:2020, Coal and coke — Manual sampling

ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal

plate

ISO 5069-2:1983, Brown coals and lignites — Principles of sampling — Part 2: Sample preparation for

determination of moisture content and for general analysis

ISO 7404-2, Methods for the petrographic analysis of coals — Part 2: Methods of preparing coal samples

ISO 7404-3, Methods for the petrographic analysis of coals — Part 3: Method of determining maceral

group composition
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 https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)
3.1
barbecue charcoal

solid remainder of carbonization of wood or other vegetable matter that does not spit or spark

abnormally when burning and has not been artificially chemically treated or artificially chemically

prepared whereby the main constituent is carbon and the ash content is minimal
3.2
table grill charcoal
barbecue charcoal with a granulation adapted to the use in small grills
Note 1 to entry: For granulation of table grill charcoal see 4.1.4.2.
3.3
restaurant charcoal

barbecue charcoal with a granulation adapted to the use in large barbecues and professional

applications
Note 1 to entry: For granulation of table grill charcoal see 4.1.4.3.
3.4
barbecue charcoal briquette

compressed barbecue charcoal particles with a food-compatible binder or without a binder

3.5
impregnated barbecue charcoal

barbecue charcoal prepared for ignition by adding a liquid, thickened liquid or gel firelighter

3.6
impregnated barbecue charcoal briquette

barbecue charcoal briquettes prepared for ignition by adding a solid, liquid, thickened liquid or gel

firelighter
3.7
solid firelighter

solid substance or preparation to be used to ignite solid barbecue fuels in barbecue and grill appliances,

that is readily ignitable by the application of a naked flame
[SOURCE: prEN 1860-3:2022, 3.1]
3.8
liquid, thickened liquid or gel firelighter

liquid, thickened liquid or gel substance or preparation to be used to ignite solid barbecue fuel used in

barbecue and grill appliances when supported on a solid substrate, which is readily ignitable by the

application of a naked flame
[SOURCE: prEN 1860-3:2022, 3.2]
3.9
fixed carbon

carbon remaining after the removal of volatile matter and ash from barbecue charcoal or barbecue

charcoal briquettes on dry basis
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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)
3.10
volatile matter

loss in mass less that due to moisture, when barbecue charcoal or barbecue charcoal briquettes is

heated out of contact with air under specific conditions
Note 1 to entry: The specific conditions are described in 6.2.
3.11
ash

solid residue after combustion of barbecue charcoal or barbecue charcoal briquettes

3.12
total moisture

water contained in the barbecue charcoal and

the barbecue charcoal briquettes which is driven off at 105 °C
3.13
total moisture

water contained in

the impregnated barbecue charcoal and the impregnated barbecue charcoal briquettes which is

removed by distillation with toluene
3.14
granulation

fraction of the particle size distribution as specified with reference to one or more screens with

specified sizes
Note 1 to entry: Expressed as percentage by weight of the barbecue charcoal.
3.15
binder

product which when added to barbecue charcoal particles holds these together in a permanent solid

mass
3.16
chemical burning sustainer
chemical added as oxidising agent to sustain burning
EXAMPLES: Nitrates, nitrites, borax
3.17
repeatability

results of duplicate determinations, carried out at different times in the same laboratory by the same

operator using the same apparatus on duplicate samples taken from the same gross sample at the last

stage of sample preparation
3.18
reproducibility

means of the results of duplicate determinations, carried out in each of two different laboratories on

representative portions taken from the same gross sample at the final stage of sample preparation

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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)
4 Requirements
4.1 Requirements for barbecue charcoal
4.1.1 Fixed carbon

The fixed carbon of barbecue charcoal on dry basis shall be calculated in accordance with 6.1 and shall

be at least 75 % by weight.
4.1.2 Ash content

The ash content of barbecue charcoal on dry basis shall be tested in accordance with 6.3 and shall not

exceed 8 % by weight.
4.1.3 Total moisture

The total moisture content of barbecue charcoal shall be tested in accordance with 6.4 and shall not

exceed 8 % by weight.
4.1.4 Granulation
4.1.4.1 Barbecue charcoal

When analysed in accordance with 6.6, the particle size of the barbecue charcoal shall be:

— not greater than 150 mm;

— at least 80 % by total weight shall be greater than 20 mm with not more than 10 % by total weight

shall be larger than 80 mm;

— less than 20 % by total weight may be 20 mm or smaller with not more than 7 % by total weight

may be smaller than 10 mm.
4.1.4.2 Table grill charcoal

When analysed in accordance with 6.6, the particle size of the table grill charcoal shall be:

— not greater than 40 mm;

— at least 90 % by total weight shall be greater than 8 mm with not more than 10 % by total weight

shall be larger than 20 mm;
— less than 10 % by total weight may be 8 mm or smaller.
4.1.4.3 Restaurant charcoal

When analysed in accordance with 6.6, the particle size of the restaurant charcoal shall be:

— not greater than 200 mm;

— at least 80 % by total weight shall be greater than 40 mm with not more than 10 % by total weight

shall be larger than 150 mm;

— less than 20 % by total weight may be 40 mm or smaller with not more than 10 % by total weight

may be smaller than 20 mm.
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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)
4.2 Requirements for barbecue charcoal briquettes
4.2.1 Fixed carbon

The fixed carbon of barbecue charcoal briquettes on dry basis shall be calculated in accordance with 6.1

and shall be at least 60 % by total weight.
4.2.2 Ash content

The ash content of barbecue charcoal briquettes on dry basis shall be tested in accordance with 6.3 and

shall be not greater than 18 % by weight.
4.2.3 Total moisture

The total moisture content of barbecue charcoal briquettes shall be tested in accordance with 6.4 and

shall not be greater than 8 % by weight.
4.2.4 Granulation

When analysed in accordance with 6.6, the percentage of granules less than 20 mm shall not be greater

than 10 %.
4.2.5 Binder

The binder shall cause no health hazards when its combustion gases come into contact with food and

the binder itself shall be food grade quality.
4.3 Impregnated barbecue charcoal and impregnated barbecue charcoal briquettes

Impregnated barbecue charcoal and impregnated barbecue charcoal briquettes shall fulfil the

requirements for barbecue charcoal and barbecue charcoal briquettes, respectively, together with the

requirements of prEN 1860-3:2022, Clause 4.
4.4 Inadmissible additions
4.4.1 Foreign substances
Adding foreign substances to the barbecue charcoal is not allowed.
4.4.2 Microscopic analysis

Microscopic analysis of the sample in accordance with 6.5 should not detect more than 4 % Vol of any

substances different from those substances resulting from dry distillation of wood or other vegetable

matter or permissible binder used in barbecue charcoal briquettes.

Examples for substances resulting from dry distillation other than barbecue charcoal or binder used in

barbecue briquettes, if applicable, are

— wood or vegetable matter residues that are not completely dry distilled (pyrolized);

— mineral substances stemming from the production and handling processes.

Not more than 1 % Vol. in total may be from the following or similar substances: fossil coals and

derivatives thereof, petroleum, coke, pitch, plastic, glass, slag, rust, splinters of metal, artificial mineral

products.
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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)
4.4.3 Chemical burning sustainers
Chemical burning sustainers may not be used.
5 Sampling
5.1 Sampling for granulometry

The granulation test shall be carried out using randomly selected bags on general sale using a minimum

total sample weight of 40 kg.

Take the whole of each package and combine it to form the sample for granulometry analysis.

5.2 Sampling for testing ash, moisture, volatile and microscopic analyses

Take the whole of the sample used to test granulometry and crush until 100 % of the whole sample is

less than 20 mm.

The samples for individual analysis are obtained from this < 20 mm-sample by the quartering method

in accordance with ISO/DIS 18283:2020.

This whole process of granulometry testing, reducing sample to < 20 mm and subsequent quartering

procedure shall be undertaken at one time and as quickly as possible in order to minimize possible

moisture loss from the bulk sample.
6 Test methods
6.1 Fixed carbon

The percentage by weight of fixed carbon is mathematically calculated by the following formula.

C(fix) = 100 – (F + A)
where

F is the volatile matter content expressed as a percentage by weight of the water-free material

(WF);
A is the ash as a percentage by weight of water-free material (WF).
The volatile matter is determined in accordance with 6.2.
6.2 Volatiles

The determination of the volatiles of barbecue charcoal and of barbecue charcoal briquettes shall be

carried out in accordance with ISO 562. A muffle furnace, heated by electricity, in which an adequate

zone at a constant and uniform temperature of (900 ± 10) °C can be maintained.

Before testing impregnated barbecue charcoal or impregnated barbecue charcoal briquettes in

accordance with ISO 562, the impregnant shall be extracted according to 6.7.
6.3 Ash content

The determination of the ash content shall be carried out in accordance with ISO 1171. The sample is

heated in air at a specified rate up to a temperature of (710 ± 10) °C and maintained at this temperature

until constant in mass.
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oSIST prEN 1860-2:2022
prEN 1860-2:2022 (E)

Before testing impregnated barbecue charcoal or impregnated barbecue charcoal briquettes in

accordance with ISO 1171, the impregnant shall be extracted according to 6.7.
6.4 Total moisture

For barbecue charcoal and barbecue charcoal briquettes the test shall be carried out in accordance with

ISO 589.

For impregnated barbecue charcoal and impregnated barbecue charcoal briquettes the impregnant

shall be extracted before carrying out the test. The moisture test shall be done in accordance with

Annex B.
6.5 Inadmissible additions
The sample shall be ground in accordance with ISO/DIS 18283:2020.

The crushed material shall be embedded in synthetic resin and prepared as polished mount according

to ISO 7404-2. It is then examined for inadmissible additions under a microscope in accordance with

ISO 7404-3.
The investigation is carried out by means of reflected light using:
a) normal white light;
b) polarized light;
c) blue light excitation.
The analysis should be performed at a magnification between 250 × and 700 × .

The quantification of inadmissible additions is given as a percentage by volume (% Vol.) and is carried

out in accordance with ISO 7404-3 with the following modifications:

— a minimum of 1 000 particles has to be counted disregarding particles on the mounting medium;

— the results of the counting are presented as a percentage by volume rounded to the first decimal

place;

— before testing impregnated barbecue charcoal or impregnated barbecue charcoal briquettes the

impregnant shall be removed.
6.6 Granulometry

The sample shall be carefully sieved with round test sieves in accordance with ISO 3310-2 with a hole

diameter of 150 mm, 80 mm, 20 mm and 10 mm, in accordance with ISO 1953. The respectively sieved

amount is determined by weighing. The sieve is riddled until no further notable passing takes place.

Stalky pieces longer than 150 mm may occur which can fall through the sieve in another direction.

These pieces should be classified in the 20 - 80 fraction.
6.7 Determination of impregnant content
The impregnated barbecue charcoa
...