BS EN ISO 3262-10:2024
Extenders. Specifications and methods of test - Natural talc/chlorite in lamellar form

Standard No.

BS EN ISO 3262-10:2024

Release Date

2024

Published By

British Standards Institution (BSI)  GB  /  BSI

Latest

BS EN ISO 3262-10:2024

Introduction

Analysis of the core content of the standard

This standard applies to the product quality control of natural layered talc/chlorite mixtures, and defines the technical indicators of four mineral grades (AD grades):

Grade	Talc content (%)	Chlorite content (%)	Loss on ignition range (%)
Grade A	85-100	0-15	4.7-9.5
Grade B	70-85	5-30	5.9-11.1
Grade C	30-70	20-70	7.0-13.9
Grade D	0-30	60-100	9.8-16.0

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Major Technical Changes

• Strengthening Asbestos Detection: Added requirements for combined use of XRD and SEM/EDX/TEM, and the detection limit was increased from 0.1% to 0.01%
• Laser particle size analyzer test method replaces traditional screening method (ISO 8130-13)
• Quartz content limit ≤0.5% (X-ray diffraction method)
• Titles are uniformly changed to "Extenders" terminology system

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Key test methods

Mineral composition analysis

The ratio of talc (3MgO·4SiO2·H2O) and chlorite (MgAl2[(OH)2/Al2Si2O10]·Mg3(OH)6) is determined by X-ray diffraction method, and the total content must meet ≥90%

Safety performance test

Asbestos detection process:

1. XRD preliminary screening (detection limit 0.1%)
2. Confirm fiber morphology by SEM/EDX or TEM (detection limit 0.01%)

Note: It is prohibited to use XRD alone as the basis for judgment

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Implementation suggestions

Corporate response measures

• Upgrade particle size analysis equipment to laser diffractometer configuration
• Establish XRD-SEM dual detection laboratory capabilities
• Raw material procurement contracts must clearly specify quartz content clauses

Standard application scenarios

Grade	Typical application	Advantages and characteristics
Grade A	Cosmetic base	High purity talc
Grade D	Ceramic filler	Good thermal stability

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Technology evolution analysis

Compared with the 2000 version of the standard, this revision mainly reflects three major trends:

1. Safety control upgrade: Echoing the strict restrictions on asbestos under the EU REACH regulations
2. Modernization of detection technology: Laser diffraction method replaces traditional screening
3. Refined mineral definition: Clarifying the boundaries of each grade through the ternary phase diagram

BS EN ISO 3262-10:2024 Referenced Document

• ISO 14966 Ambient air — Determination of numerical concentration of inorganic fibrous particles — Scanning electron microscopy method
• ISO 18451-1 Pigments, dyestuffs and extenders — Terminology — Part 1: General terms
• ISO 3262-1 Extenders — Specifications and methods of test — Part 1: Introduction and general test methods
• ISO 3262-2:2023 Extenders — Specifications and methods of test — Part 2: Baryte (natural barium sulfate)
• ISO 787-2 General methods of test for pigments and extenders — Part 2: Determination of matter volatile at 105 °C
• ISO 787-3 General methods of test for pigments and extenders - Part 3: Determination of matter soluble in water; Hot extraction method
• ISO 787-7 General methods of test for pigments and extenders - Part 7: Determination of residue on sieve - Water method - Manual procedure
• ISO 787-9 General methods of test for pigments and extenders — Part 9: Determination of pH value of an aqueous suspension

BS EN ISO 3262-10:2024 history

• 2024 BS EN ISO 3262-10:2024 Extenders. Specifications and methods of test - Natural talc/chlorite in lamellar form
• 0000 BS EN ISO 3262-10:2000(2001)
• 2000 BS EN ISO 3262-10:2000 Extenders for paints - Specifications and methods of test - Natural talc/chlorite in lamellar form
• 1998 BS EN ISO 3262-3:1998 Extenders for paints - Specifications and methods of test - Blanc fixe
• 1976 BS 1795:1976 Specification for extenders for paints

Standard and Specification