Overview
EN ISO 3262-12:2023 (ISO 3262-12:2023) specifies requirements and corresponding methods of test for muscovite-type mica as an extender (filler) material. Published by ISO in cooperation with CEN, this second edition updates and supersedes the 2001 edition. The standard is intended for manufacturers, testing laboratories and purchasers who need reproducible, harmonized specifications and test methods for muscovite mica used in industrial formulations.
Key topics and technical requirements
The document defines essential and conditional requirements and references general test methods (ISO 787 series, ISO 3262-1, ISO 8130-13, ISO 18451-1). Main technical requirements include:
- Composition (mass fraction):
- K2O: 9 to 12%
- Al2O3: 30 to 40%
- SiO2: 43 to 49%
- Fe2O3: max. 3.5%
- MgO: max. 1%
- Physical and chemical limits:
- Matter volatile at 105 °C: max. 1% (ISO 787-2)
- Loss on ignition: max. 6.5% (ISO 3262-1)
- Matter soluble in water (hot extraction): max. 0.5% (ISO 787-3)
- pH of aqueous suspension: 6 to 9 (ISO 787-9)
- Conditional requirements (to be agreed between parties):
The standard also specifies the minimum content for a test report including product identification, reference to ISO 3262-12:2023, test results and methods, deviations, anomalies and test dates.
Practical applications and users
EN ISO 3262-12:2023 is used for:
- Quality control and acceptance testing of muscovite-type mica supplied as an extender.
- Supplier and purchaser specifications during procurement and conformity assessment.
- Product development and formulation where consistent filler properties are required.
Typical users include pigment and extender manufacturers, testing laboratories, coatings and paints formulators, and materials procurement teams who require consistent performance and traceable test results.
Related standards
Key normative references and related documents:
- ISO 3262-1 - Extenders: Introduction and general test methods
- ISO 787 series - General methods of test for pigments and extenders (parts 2, 3, 7, 9, 14, 18)
- ISO 8130-13 - Particle size distribution (instrumental)
- ISO 18451-1 - Terminology for pigments, dyestuffs and extenders
Keywords: EN ISO 3262-12:2023, ISO 3262-12, muscovite-type mica, extenders, specifications, methods of test, pigments and extenders, particle size distribution, loss on ignition, matter soluble in water.