Overview
SIST EN ISO 8130-3:2021 is a European and international standard specifying a liquid displacement pycnometer method for determining the density of coating powders. Developed by ISO/TC 35 and CEN/TC 139 committees, this method relies on accurately measuring the mass and volume of a powder sample using a pycnometer filled with a suitable liquid. It replaces the earlier 2010 edition and includes key revisions such as updated references, clarified procedures, and enhanced expression of results. This standard is essential for manufacturers and laboratories focused on quality control and characterization of powder coatings.
Key Topics
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Scope and Applicability
The standard applies to coating powders-solid particles used in paints and varnishes-and specifies a method for density measurement when the density is generally above 1 g/cm³. Powders with density below 1 g/cm³ may be tested under ISO 1183-1 by agreement.
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Principle
Density is calculated by determining the mass of a test sample and the volume of displacement liquid it displaces in a pycnometer. This liquid must fully wet the powder without dissolving or swelling it.
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Materials and Liquids
Uses purified water (grade 3, per ISO 3696) and displacement liquids such as specific aliphatic hydrocarbons free of aromatics, with boiling points between 80°C and 140°C. Different coating powders may require alternative liquids to prevent interaction.
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Apparatus
Includes a pycnometer compliant with ISO 2811-1, a vacuum pump for degassing, and a high-precision balance capable of weighing up to 200 g with 1 mg resolution.
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Procedure
The powder sample is introduced into a pycnometer partially filled with displacement liquid. Air bubbles are removed by vacuum, and the pycnometer is filled to a specific mark. Masses are carefully recorded to enable density calculation. Measurements should be repeated twice under controlled temperature (23 ± 1 °C) and humidity conditions, with accepted result deviations within 2%.
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Result Calculations and Reporting
Density is expressed in grams per cubic centimeter (g/cm³), averaged over valid replicates. Detailed test reports must include sample details, pycnometer type, liquid used, test results, deviations from the standard method, observed anomalies, and testing date.
Applications
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Quality Control
Assuring consistent density of coating powders facilitates uniform coating application, affecting coverage, finish, and curing behavior.
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Product Development
Precise density determination helps in formulating new powder coatings, optimizing raw material ratios for performance and cost-efficiency.
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Regulatory Compliance
Meeting international density measurement standards ensures products satisfy industrial and regulatory requirements for paints and varnishes.
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Material Characterization
Provides fundamental physical properties data aiding in research and comparison of powder coating materials from various suppliers.
Related Standards
- ISO 1183-1: Methods for determining the density of plastics by immersion and liquid pycnometer methods, applicable for powders with density