Overview
ISO 2006-1:2022 - Rubber latex, synthetic - Determination of mechanical stability - Part 1: High-speed method specifies a laboratory procedure to measure the mechanical stability (resistance to coagulation under shear) of synthetic rubber latex using a high‑speed stirring test. The standard defines sampling, apparatus, test conditions and result expression for un‑compounded synthetic latices and replaces the 2009 edition with technical updates (notably addition of a 45 µm filter option).
Key topics and technical requirements
- Scope: Applies only to synthetic rubber latex (not compounded latices).
- Principle: A measured portion of latex is stirred at high speed; formed coagulum is collected, dried and weighed. The mass of coagulum is inversely proportional to mechanical stability.
- Apparatus & conditions:
- Stirring speed: 14 000 min⁻¹ ± 200 min⁻¹ using a defined stainless‑steel shaft and disc assembly.
- Latex container: specified cylindrical flat‑bottom geometry (internal diameter ~58 mm).
- Test portion: 50 g ± 0.5 g after preliminary filtration and temperature adjustment to 25 °C ± 3 °C.
- Filters: stainless‑steel wire cloth 180 µm ± 10 µm and/or 45 µm ± 5 µm (45 µm recommended for high‑stability latices such as those for high‑speed coating or paper industry).
- Drying and weighing: test filter with coagulum dried at 100 °C ± 5 °C to constant mass.
- Special provisions:
- Latices with apparent viscosity > 200 mPa·s (Brookfield method) must be diluted so viscosity ≤200 mPa·s and solids reduction ≤10% (note: dilution can change soap balance and stability).
- Duplicate determinations are required.
- Expression of results: Two methods
- Method A - coagulum as % of the test portion mass.
- Method B - coagulum as % of the latex total solids (requires ISO 124 total solids measurement).
- Reporting: Include filter specification, calculation method, dilution and total solids, test duration, result to three decimals, and any deviations.
Applications and users
- Quality control and acceptance testing in latex manufacture, coatings, paper coating, adhesives and rubber product supply chains.
- Useful for R&D, process optimization, incoming raw‑material inspection and troubleshooting of mechanical destabilization during mixing, pumping or coating at high shear.
- Typical users: QC laboratories, production engineers, raw‑material suppliers and test houses.
Related standards
- ISO 123 - Rubber latex - Sampling
- ISO 124 - Latex - Determination of total solids content
- ISO 1652 - Latex - Apparent viscosity (Brookfield method)
- ISO 3310‑1 - Test sieves - Technical requirements (metal wire cloth)
Keywords: ISO 2006-1:2022, mechanical stability, synthetic rubber latex, high-speed method, latex testing, coagulum, total solids, 45 µm filter, latex quality control.
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