ISO 712-1:2024

Overview

ISO 712-1:2024 - "Cereals and cereal products - Determination of moisture content - Part 1: Reference method" defines a routine reference method for measuring moisture content in a wide range of cereals and cereal products. It applies to wheat, rice (paddy, husked and milled), barley, millet (Panicum miliaceum), rye, oats, triticale and sorghum in the form of grains, milled grains, semolina or flour. The document replaces ISO 712:2009 (minor revision) and is intended for laboratory use where an accurate, reproducible moisture determination is required.

Key topics and technical requirements

• Scope & exclusions: Not applicable to maize and pulses (see ISO 6540 for maize and ISO 24557 for pulses).
• Principle: Dry a representative test portion under controlled conditions so results correspond to the absolute method in Annex B.
• Apparatus:
  • Analytical balance accurate to ±0.001 g.
  • Grinding mill with low heat development, airtight construction and adjustable particle size.
  • Non‑corrodible metal or glass dish with lid; test portion surface mass ≤ 0.3 g/cm².
  • Constant‑temperature oven maintaining 130 °C to 133 °C near test portions and able to recover temperature in < 30 min after loading.
  • Desiccator with effective desiccant.
• Sample preparation:
  • Products with specified particle-size characteristics (Table 1) may be tested without grinding.
  • Grinding is required if particle-size limits are not met; some samples require preconditioning to bring moisture to between 9 % and 15 % before grinding (typically when moisture > 15 % or < 9 %).
• Procedure:
  • Test portion: 5 g ± 1 g, weighed to 0.001 g.
  • Drying: typically 120 min ± 5 min at 130–133 °C (flours: 90 min). In hot, dry climates drying may be reduced to 60 min ± 5 min when constant mass is achieved.
  • Two determinations required; repeat if difference exceeds repeatability limits.
• Precision & reporting: Clauses cover interlaboratory testing, repeatability, reproducibility and uncertainty; test report requirements are specified.

Practical applications and users

ISO 712-1:2024 is used by:

• Quality control and testing laboratories in milling, grain trading and food manufacturing.
• Commodity graders, cereal research institutes and conformity assessment bodies needing a reference-level moisture determination.
• Supply chain stakeholders who require standardized moisture values for storage, processing or commercial transactions.

Benefits include consistent moisture measurement, traceable laboratory practice, and improved comparability across laboratories.

Related standards

• ISO 6540 - moisture determination for maize
• ISO 24557 - moisture determination for pulses
• ISO 24333 - recommended sampling of cereals and cereal products

Keywords: ISO 712-1:2024, moisture content, cereals, reference method, drying temperature, laboratory procedure, grain testing.