Overview
ISO 7970:2021 - Wheat (Triticum aestivum L.) - Specification defines minimum quality and safety specifications for common wheat intended for human consumption and international (and local) trade. The fourth edition (2021) sets requirements for sensory, health, physical and chemical characteristics of wheat grain and defines sampling and test methods used to verify compliance. This standard is an essential reference for wheat quality control, trade contracts and food-safety compliance.
Key topics and technical requirements
- Scope: Applies to wheat (Triticum aestivum L.) grains for human consumption in international and local trade.
- General characteristics: Grain shall be sound, clean and free of foreign or deteriorative odours.
- Health requirements: No added hazardous compounds; contaminants such as mycotoxins, heavy metals and pesticide residues must meet national limits or Codex Alimentarius.
- Moisture content: Determined per ISO 712 - maximum 14.5% (mass fraction). Destination-specific water contents may be required for transport/storage.
- Bulk density (mass per hectolitre): Determined per ISO 7971-1 or ISO 7971-3 - minimum 70 kg/hl.
- α‑Amylase activity (Falling Number): Determined per ISO 3093 - minimum 180 s.
- Impurities: Determined by the method in Annex C. Maximum permissible levels include:
- Broken grains: 7.0%
- Wheat of decreased value: 12.0%
- Grains attacked by pests: 2.0%
- Unsound grains: 1.0%
- Other cereals: 3.0%
- Extraneous matter: 2.0%
- Inorganic extraneous matter: 0.5%
- Harmful/toxic matter: 0.5%, each toxic seed 0.05%, ergot 0.05%
- Note: Certain damaged categories combined must not exceed 15.0%, and black point grains have a specific 8% tolerance rule.
- Pests and harmful seeds: Informative Annexes list unacceptable stored‑grain insects and indicative harmful/toxic seeds (e.g., corn‑cockle, darnel).
- Sampling & test methods: Sampling per ISO 24333; testing per clauses 4.3 and Annex C and referenced ISO methods.
Practical applications and users
Who uses ISO 7970:2021:
- Grain traders and commodity managers - for trade contract specifications and lot acceptance criteria.
- Millers and food processors - to assess raw material suitability (moisture, falling number, impurities).
- Quality control laboratories - for standardized test methods and reporting.
- Storage and logistics operators - to set storage/moisture limits and pest‑management thresholds.
- Regulatory bodies and import/export authorities - for compliance verification and food safety enforcement.
Practical uses:
- Drafting commercial contracts for international wheat shipments.
- Performing acceptance testing at arrival or pre-shipment inspections.
- Implementing quality control programs that reference harmonized impurity and falling‑number limits.
Related standards
ISO 712, ISO 3093, ISO 7971‑1/3, ISO 24333, ISO 6639‑3/4 and relevant Codex Alimentarius references are cited and used together with ISO 7970:2021 for sampling, moisture, falling number, bulk density and insect‑infestation determinations.
