Overview
SIST EN ISO 8780-6:1997 defines a standardized method for dispersing pigments and extenders using a triple-roll mill. This method provides a systematic approach for assessing the dispersion characteristics of pigments and extenders under conditions that closely simulate industrial production. It is intended for use with a high-viscosity binder system and must be performed in conjunction with the assessment methods outlined in ISO 8781. The standard ensures reliable and reproducible results, supporting quality control and product development in industries utilizing pigments and extenders.
Key Topics
- Method of Dispersion: Focuses on using a triple-roll mill, an established piece of equipment in the coatings and pigments industry, for dispersing high-viscosity mill bases.
- Assessment Procedures: Supports evaluation procedures such as fineness of grind, tinting strength, and gloss, using compatible ISO 8781 methods.
- Binder System: Stresses agreement on a binder system between parties to ensure consistency and comparability of test results.
- Test Conditions: Recommends that testing for both the sample and reference pigment is carried out at the same temperature, crucial for accurate comparative analysis.
- Reporting Requirements: Details necessary information for test reports, including equipment used, binder details, mill base composition, and any deviations from the standard procedure.
- Supplementary Information: Specifies additional parameters (such as the mill’s technical details or stabilization procedures) to be agreed upon between parties for clarity and reproducibility.
Applications
The standardized triple-roll mill dispersion method finds broad application in industries where pigment and extender quality is critical, such as:
- Paints and Coatings: Used during product development and quality control to assess pigment dispersibility under production-relevant conditions.
- Plastics Manufacturing: Assesses how pigments and extenders disperse in viscous systems, simulating actual manufacturing processes.
- Printing Inks: Ensures pigments are uniformly dispersed to achieve consistent coloration and stability in finished products.
- Quality Assurance Laboratories: Provides a robust benchmark for comparing new pigment grades or alternative materials against established references.
- Binder Formulation Testing: Assists in optimizing binder-pigment interactions by evaluating performance within high-viscosity mill bases.
Implementing ISO 8780-6 enhances product performance, reduces production variability, and supports evidence-based product development decisions.
Related Standards
For thorough assessment and full compliance, SIST EN ISO 8780-6 should be used in conjunction with related standards, including:
- ISO 8780 Series:
- Part 1: Introduction to dispersion methods
- Part 2: Oscillatory shaking machine dispersion
- Part 3: High-speed impeller mill dispersion
- Part 4: Bead mill dispersion
- Part 5: Automatic muller dispersion
- ISO 8781 Series: Methods for assessment of dispersion characteristics (tinting strength, fineness of grind, gloss)
- ISO 787-24: General pigment and extender test methods, relevant for determining relative tinting strength and scattering power
- ISO 1524: Paints and varnishes - Determination of fineness of grind
- ISO 842: Sampling of raw materials for paints and varnishes
By following the guidelines and referencing the related standards, organizations can ensure reliable, repeatable, and comparable test results for the dispersion of pigments and extenders using triple-roll mill techniques, optimizing processes and supporting international quality requirements.
