♻️ Ash content of solid recovered fuels (SRF) — PN-EN ISO 21656

Petrochemistry PN-EN ISO 21656

Overview

SCOPE FROM THE PKN CATALOGUE CARD, IN FULL (our translation): "This document specifies methods for the determination of the ash content of all solid recovered fuels."

METHODS — PLURAL ON THE CARD, LETTERS IN THE SCOPES. The card speaks of "methods" but does not list them. Accreditation scopes show that the standard has at least two methods designated by letters: AB 418 cites "method A" (metodę A), AB 1267 — "Method B" (Metodę B), AB 1913 is accredited for the standard "excluding method A" (z wyłączeniem metody A), and AB 300 — "excl. cl. 7.3" (z wył. pkt. 7.3). How methods A and B differ — WE HAVE NOT ESTABLISHED: we do not have the text of the standard, and the card does not say.

TECHNIQUES AND SUBJECTS IN THE SCOPES. Each of the 20 laboratories gives a technique — in the technique field or in the description of the test: the gravimetric method 17, thermogravimetric (TGA) 9, both 6. The subjects are solid recovered fuels (SRF) and wastes with codes including 19 12 08, 19 12 10, 19 12 12, 20 01 11, 20 03 01; one record concerns solid biomass. The test is called "Ash content" (Zawartość popiołu), sometimes with the addition "residue on combustion" (pozostałość po spaleniu).

EDITION AND PREDECESSOR. PN-EN ISO 21656:2021-08 in the English version (26 pages, KT 144 Coke and Processed Solid Fuels; the card has no "Withdrawn" heading — status of the card as of 23.09.2026) adopts EN ISO 21656:2021 and ISO 21656:2021 [IDT]; according to the card it replaces PN-EN 15403:2011 — English version, whose card has the heading "Withdrawn and replaced by PN-EN ISO 21656:2021-08" and the withdrawal date 24-08-2021. The predecessor has not disappeared from the scopes completely: "PN-EN 15403:2011" stands in 2 records at one laboratory (measurement of 23.09.2026).

RELATED ENTRIES IN THIS DATABASE. Ash is also described here by the entries on solid mineral fuels (PN-ISO 1171) and on solid biofuels (PN-EN ISO 18122). For solid recovered fuels the database also has PN-EN ISO 21663 (carbon, hydrogen, nitrogen and sulphur) and PN-EN ISO 21654 (calorific value).

WHAT WE DO NOT GIVE. We do not have the text of the standard — PKN sells it. That is why WE DO NOT GIVE the ashing temperature and time, the sample mass, the type of vessels, the method of calculating the result or the differences between methods A and B.

SCALE OF CITATIONS (measurement of 23.09.2026). The key "PN-EN ISO 21656" — 20 laboratories / 35 entries, the same as across all forms of notation.

Method principle

The standard specifies methods for the determination of the ash content of solid recovered fuels — that is what the PKN card says. Accreditation scopes distinguish methods A and B and give the gravimetric or thermogravimetric technique; WE DO NOT GIVE the ashing conditions.

Applications

• Ash content of solid recovered fuels (SRF)
• Combustible wastes with codes including group 19 12 and 20 01 11 and 20 03 01 (subjects from accreditation scopes)

Key parameters

Standard

Standard number

PN-EN ISO 21656:2021-08 (wersja angielska; wprowadza EN ISO 21656:2021 [IDT] i ISO 21656:2021 [IDT])

Title (PL)

Stałe paliwa wtórne — Oznaczanie zawartości popiołu

Title (EN)

Solid recovered fuels — Determination of ash content

Step-by-step procedure

1. Choice of method

   The standard has at least methods A and B (records in accreditation scopes). How they differ — WE HAVE NOT ESTABLISHED.

2. Determination

   WE DO NOT GIVE the ashing conditions and the calculations — they are in the text of the standard.

3. Entry in the report

   State the edition of the standard, the method (A or B) and the technique — the scopes distinguish them explicitly.

Required equipment and apparatus

Reagents, media and consumables

Health and safety (OHS)

• High furnace temperature and hot vessels — thermal gloves
• Solid recovered fuels are produced from waste — when grinding samples, protection of the respiratory tract and hands

Frequently asked questions