oSIST prEN 13409:2026

oSIST prEN 13409:2026 is a CEN draft European Standard for measuring the setting time of cementitious and calcium sulfate-based floor levelling compounds after mixing with the liquid component. It specifies a Vicat-needle test for determining initial and final setting times, so laboratories can assess products used to prepare subfloors before floor coverings are installed.

What does oSIST prEN 13409:2026 specify?

oSIST prEN 13409:2026 specifies a test method for the setting time of a prepared cementitious or calcium sulfate-based floor levelling compound after mixing with water or another liquid component. It is written for floor levelling compounds used to create a homogeneous subfloor layer with consistent absorbency, evenness and strength.

The document is organized into nine clauses: scope, normative references, terms and definitions, principle, standard test conditions, apparatus and materials, procedure, expression of results, and test report. In practice, this means the standard tells the laboratory what to test, which equipment and atmosphere to use, how to run the Vicat-needle measurement, how to calculate the result, and what to record in the report.

What are the key requirements of oSIST prEN 13409:2026?

oSIST prEN 13409:2026 bases the test on observing needle penetration into the mixed compound and recording the time to defined penetration values. The practical point is that the setting time is not judged visually alone - it is measured with a defined apparatus and a defined reading point.

Test conditions and equipment

• Standard test conditions are 23 °C ± 2 °C and 50 % ± 5 % relative humidity, with air circulation below 0.2 m/s, and all materials and apparatus stored under those conditions. This reduces variation from temperature and moisture.
• Vicat apparatus is used in accordance with EN 196-3, with a steel needle of defined size and mass and truly vertical movement. This gives comparable penetration results between laboratories.
• The mould is a hard-rubber truncated cone of defined depth and diameter, placed on a plane glass plate. Other mould materials or shapes may be used only if they give the same results.
• A timer accurate to 1 s is required. This matters because the result is reported in minutes but depends on timing of successive penetrations.

Sample preparation and calibration

• The Vicat apparatus is calibrated before testing by lowering the needle to the base plate and setting the pointer to zero.
• The floor levelling compound and liquid are mixed in accordance with prEN 1937:2026, then the mould is filled immediately without compaction or vibration. This keeps the sample representative of the mixed product as used.

Determining the setting times

• For initial setting time, the needle is applied when the mix shows signs of setting, with a short pause before release, and repeated at intervals until the scale reading reaches 4 mm ± 1 mm. This identifies the point where the material has started to lose plasticity.
• For final setting time, testing continues until the needle penetrates only 0.5 mm. This marks the later stage when the material has essentially set.

Reporting

• The results are expressed as elapsed time from the end of mixing, rounded to the nearest minute.
• The test report must identify the product, the liquid proportion, the mixing method and total mixing time, the initial and final setting times, any deviations, and the test date. That gives users traceability when comparing batches or checking conformance.

What terms does oSIST prEN 13409:2026 define?

oSIST prEN 13409:2026 uses a small set of technical terms to make the test unambiguous.

• Setting - the transition from a plastic state to a solid state.
• Setting time - the time characterized by the initial and final penetration times.
• Initial setting time - the elapsed time to the point where the needle reading is 4 mm ± 1 mm.
• Final setting time - the elapsed time to the point where the needle first penetrates only 0.5 mm.
• Floor levelling compound - the cementitious or calcium sulfate-based material tested for subfloor preparation.
• Vicat apparatus - the penetration device used to measure setting by needle resistance.

Who uses oSIST prEN 13409:2026?

oSIST prEN 13409:2026 is used by testing laboratories, manufacturers of floor levelling compounds, and quality control teams that need a repeatable way to measure setting time. It is relevant to product development, batch release testing, and technical comparison of cementitious and calcium sulfate-based systems used before floor coverings are installed.

What changed in oSIST prEN 13409:2026 from the previous edition?

oSIST prEN 13409:2026 will supersede EN 13409:2002. The stated changes are the replacement of the term “hydraulic setting floor smoothing and/or levelling compounds” with “cementitious and calciumsulfate-based floor levelling compounds,” a more concrete scope, and editorial changes.

Which standards are used with oSIST prEN 13409:2026?

oSIST prEN 13409:2026 refers to four companion standards in clause 2:

• EN 196-3 - provides the Vicat apparatus basis and the related setting-time test framework.
• EN 923 - supplies adhesive terminology used for terms and definitions.
• prEN 1937:2026 - provides the standard mixing procedures and the floor levelling compound and liquid used in the test.
• ISO 554 - specifies the standard atmospheres used for conditioning and testing.

What does the oSIST prEN 13409:2026 document contain?

oSIST prEN 13409:2026 contains the test principle, the required atmosphere, the apparatus description, and a step-by-step procedure for initial and final setting time measurements. It also includes a figure showing the Vicat apparatus arrangement and needle, which helps laboratories set up the test consistently.

The document further contains the result expressions and the test report items needed for traceability. In practice, it is a laboratory method document for testing, quality control, and product characterization rather than a product specification.