ISO 6540:2021 PDF

Maize — Determination of moisture content (on milled grains and on whole grains)

Название (английский):

ISO 6540:2021

Maize — Determination of moisture content (on milled grains and on whole grains)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 25
Дата публикации:: 19 февраля 2021 г.
Издание:: ISO IS 6540 edition 2 version 1
ICS:: 67.060

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Описание (английский):

This document specifies two methods: - a reference method for the determination of the moisture content of maize grains and ground whole maize, groats, grits and maize flour, see Clause 4; - a routine method for the evaluation of the moisture content of maize in whole grains, see Clause 5. The latter is not suitable for use for experts' reports, or for calibration or checking of humidity meters, because of its significant bias to the reference method (see Table B.3).

Технические детали

Технический комитет: ISO/TC 34/SC 4 - Cereals and pulses
SKU: ISO 6540:2021

Abstract

Overview

ISO 6540:2021 - Maize - Determination of moisture content (on milled grains and on whole grains) specifies two laboratory methods to determine moisture in maize and maize products:

a reference method (for maize grains and ground whole maize, groats, grits and maize flour), and
a routine method (for whole grains only).

The document describes required apparatus, sample preparation, drying/weighing procedures, expression of results, precision data from interlaboratory tests and informative annexes (including an absolute method and interlaboratory results).

Keywords: ISO 6540, moisture content, maize moisture determination, reference method, routine method, maize testing standard.

Key technical topics and requirements

Two-method approach
- Reference method: Intended as the primary laboratory method; aligns with the absolute method (Annex A). Suitable for expert reports, calibration and verification.
- Routine method (whole grains): Faster and easier for series testing but has a systematic positive bias (~0.30% mass fraction) relative to the reference method and is not appropriate for expert reports or humidity-meter calibration.
Drying conditions
- Reference drying temperature is specified between 130 °C and 133 °C to match the absolute method.
Apparatus
- Analytical balances (high precision), grinding mill (non‑moisture-absorbing, low heat generation), metal boats or capsules, constant-temperature ovens (two types, including one controllable to 130–133 °C with specified heat-recovery performance and ventilation effectiveness), desiccator.
- Ventilation performance is evaluated using durum wheat semolina as a test material (specified limits on moisture result variation).
Sampling and sample prep
- Sampling itself is outside scope; ISO 24333 is recommended for sampling procedures.
- Particle-size rules: products with particle sizes ≤ 1.7 mm (with ≤10% >1 mm and ≥50%

Overview

ISO 6540:2021 - Maize - Determination of moisture content (on milled grains and on whole grains) specifies two laboratory methods to determine moisture in maize and maize products:

a reference method (for maize grains and ground whole maize, groats, grits and maize flour), and
a routine method (for whole grains only).

Keywords: ISO 6540, moisture content, maize moisture determination, reference method, routine method, maize testing standard.

Key technical topics and requirements

Two-method approach
- Reference method: Intended as the primary laboratory method; aligns with the absolute method (Annex A). Suitable for expert reports, calibration and verification.
- Routine method (whole grains): Faster and easier for series testing but has a systematic positive bias (~0.30% mass fraction) relative to the reference method and is not appropriate for expert reports or humidity-meter calibration.
Drying conditions
- Reference drying temperature is specified between 130 °C and 133 °C to match the absolute method.
Apparatus
- Analytical balances (high precision), grinding mill (non‑moisture-absorbing, low heat generation), metal boats or capsules, constant-temperature ovens (two types, including one controllable to 130–133 °C with specified heat-recovery performance and ventilation effectiveness), desiccator.
- Ventilation performance is evaluated using durum wheat semolina as a test material (specified limits on moisture result variation).
Sampling and sample prep
- Sampling itself is outside scope; ISO 24333 is recommended for sampling procedures.
- Particle-size rules: products with particle sizes ≤ 1.7 mm (with ≤10% >1 mm and ≥50%

ISO 6540:2021 PDF

Технические детали

Abstract

Overview

Key technical topics and requirements

Похожие стандарты

Abstract

Overview

Key technical topics and requirements

Похожие стандарты

Maize - Determination of moisture content (on milled grains and on whole grains) (ISO 6540:2021)

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