DIN EN ISO 19743 2017-08 PDF

Full title and description

STB DIN EN ISO 19743:2017-08 — Solid biofuels — Determination of content of heavy extraneous materials larger than 3,15 mm (adoption of ISO 19743:2017; German language version published August 2017). The document specifies a laboratory method using sink-and-float separation combined with elutriation to determine heavy extraneous particles (top size > 3,15 mm, density > 1 g/cm³) in woody biomass feedstocks used as solid biofuel.

Abstract

This standard defines a procedure to quantify heavy extraneous materials (stones, glass, metal, rubber and certain plastics) larger than 3,15 mm in solid woody biofuels. The method combines sink-and-float density separation with elutriation and allows optional hand-sorting of light, low-density contaminants. Results help evaluate fuel quality and predict processing/combustion issues caused by coarse contaminants.

General information

• Status: Published nationally as DIN EN ISO 19743:2017-08 (original ISO edition 2017). Note: ISO lists the 2017 edition as superseded in its lifecycle and a revised ISO 19743 (2026) is indicated as the newer edition.
• Publication date: DIN publication: August 2017 (ISO original: April 2017).
• Publisher: Deutsches Institut für Normung (DIN) / International Organization for Standardization (ISO) — national adoption as EN / DIN EN ISO.
• ICS / categories: 75.160.40 (Solid biofuels); 27.190 (Materials testing / laboratory methods).
• Edition / version: DIN EN ISO 19743:2017-08 — Edition 1 (identical to ISO 19743:2017).
• Number of pages: 12 (DIN/EN PDF edition); the ISO original document is a short technical standard (brief edition).

Scope

The standard applies to woody biomass (see ISO 17225‑1:2014 classification) and specifies a method for determining the content, by mass percentage, of heavy extraneous materials with a top particle size larger than 3,15 mm and specific density greater than 1 g/cm³. It is intended for use when assessing feedstock suitability for size reduction and combustion and does not quantify fine (< 3,15 mm) contaminants that may affect ash content.

Key topics and requirements

• Definition of "heavy extraneous materials" (> 3,15 mm top size, density > 1 g/cm³) and examples (stones, glass, metal, rubber, some plastics).
• Sample preparation and representative sampling references (linked to ISO sampling and sample‑preparation standards).
• Sink-and-float separation procedure to separate high-density from low-density fractions.
• Elutriation steps to remove fine light material and to classify particles by size/density.
• Optional hand-sorting of low-density visible impurities (e.g., plastic foil) and rules for inclusion/exclusion in reported result.
• Calculation and reporting of mass percentage of heavy extraneous material in the tested sample; reporting of top-size cut-off (3,15 mm) and any deviations from method.
• Notes on limitations: method does not account for contaminants smaller than 3,15 mm and is targeted at woody biomass as defined in ISO 17225‑1.

Typical use and users

Used by fuel testing laboratories, biomass suppliers, pellet and briquette manufacturers, utilities, quality assurance teams and certification bodies to verify feedstock quality, to prevent damage to processing equipment and to assess risk for increased ash or abrasive particles in combustion systems. Also used in procurement/specification verification for woody biomass consignments.

Related standards

Commonly used alongside other solid-biofuel and sampling standards, for example ISO 17225‑1 (fuel specifications and classes), ISO 14780 (sample preparation), ISO 18135 (sampling), ISO 18134 (moisture determination) and related test-sieve and laboratory equipment standards. National adoptions (EN, DIN, BS, etc.) may carry identical text as EN ISO 19743:2017.

Keywords

solid biofuels; woody biomass; heavy extraneous materials; contaminants; sink-and-float; elutriation; sample preparation; stones; metal; glass; particle size 3,15 mm; fuel quality.

FAQ

Q: What is this standard?

A: DIN EN ISO 19743:2017-08 is the German/EN adoption of ISO 19743:2017 — a laboratory method standard for determining the mass content of heavy extraneous materials larger than 3,15 mm in woody solid biofuels.

Q: What does it cover?

A: It specifies a sink-and-float separation combined with elutriation to separate and quantify high-density coarse contaminants (stones, metal, glass, certain plastics) in woody biomass. It covers method steps, sample handling, calculation and reporting for contaminants larger than 3,15 mm; it does not address fine contaminants under that size.

Q: Who typically uses it?

A: Testing laboratories, biomass producers and traders, fuel specification authors, pellet/briquette manufacturers, power plant fuel quality teams and certification bodies who need to assess coarse contaminant levels that could damage equipment or affect combustion.

Q: Is it current or superseded?

A: The standard was published in 2017 (DIN EN ISO 19743:2017-08). International records indicate the 2017 edition has a revised lifecycle and that a newer ISO 19743 edition (2026) is available/scheduled; users should verify the current national adoption/supersession status with their national standards body before relying on the 2017 text for regulatory or contractual purposes.

Q: Is it part of a series?

A: Yes — it is part of the family of solid-biofuel standards (ISO TC 238 deliverables) that include sampling, sample preparation, moisture determination and fuel specification documents (for example ISO 17225, ISO 18135, ISO 18134, ISO 14780). These related standards are normally used together when characterizing biofuel quality.

Q: What are the key keywords?

A: Solid biofuels; woody biomass; heavy extraneous materials; contaminants; sink-and-float; elutriation; stones; metal; particle size 3,15 mm; fuel quality.