Overview
SIST EN ISO 5530-2:2025 (ISO 5530-2:2025) defines a standardized method to determine the rheological properties of wheat flour doughs using an extensograph. The method records a load–extension curve from an extension test and uses derived parameters to assess general flour quality and the flour’s response to improving agents. It is applicable to experimental and commercial flours from wheat (Triticum aestivum L.).
Key technical topics and requirements
- Principle: An extensograph extension test records the load–extension curve; derived values (resistance, extensibility, energy) describe dough behaviour.
- Dough preparation: Dough is prepared using a farinograph (see ISO 5530-1) to reach the required consistency before extensograph testing.
- Moisture control: Flour moisture must be determined (refer ISO 712-1) and laboratory water quality per ISO 3696.
- Measured parameters:
- Extensograph water absorption - water volume to reach a consistency of 500 FU after 5 min mixing.
- Resistance to stretching - includes maximum resistance and resistance at constant deformation.
- Extensibility (E) - distance until rupture; calculated automatically in electronic systems.
- Energy - area under the recorded curve (measured by planimeter for mechanical devices; computed in electronic devices).
- Ratio (R/E) - resistance to extensibility ratio used for quality interpretation.
- Apparatus and procedure: Detailed apparatus description (Annex A), sampling, test portion, dough mixing, test execution, and result expression are specified.
- Precision and validation: Repeatability and reproducibility statistics from interlaboratory testing are included (Annex B); fidelity data are provided (Annex C).
- Reporting: Required test-report elements and interpretation guidelines are specified.
Practical applications and users
This standard is essential for:
- Flour millers and quality control labs - routine specification testing and batch acceptance.
- Cereal scientists and R&D - formulation studies, effect of improvers and enzymes.
- Bakers and ingredient suppliers - understanding dough handling, extensibility and resistance for process optimization.
- Regulatory and standards bodies - harmonized method for comparative studies and trade.
Use cases include assessing flour strength, predicting baking performance, comparing improving agents, and supporting product development or quality assurance programs.
Related standards (for cross-reference)
- ISO 5530-1 - Farinograph method for water absorption and rheological properties.
- ISO 712-1 - Moisture content determination (reference method).
- ISO 3696 - Water for analytical laboratory use.
- ICC 114 and AACC Method 54-10 - related extensograph procedures referenced for compatibility.
Keywords: ISO 5530-2:2025, extensograph, wheat flour rheology, dough rheological properties, extensograph water absorption, farinograph, load–extension curve, flour quality assessment.
