ISO 23900-3:2015 PDF

Pigments and extenders — Methods of dispersion and assessment of dispersibility in plastics — Part 3: Determination of colouristic properties and ease of dispersion of black and colour pigments in polyethylene by two-roll milling

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Title (English):

ISO 23900-3:2015

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 6
Publication date:: April 24, 2015
Edition:: ISO IS 23900 edition 1 version 1
ICS:: 87.060.10

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Description (English):

ISO 23900-3:2015 specifies a method of determining in polyethylene (PE) the colouristic properties of a test pigment relative to a standard, and the ease of dispersion DHPE of pigments from the differences in colour strength on dispersing colouring materials under various conditions. Method A is appropriate for use with organic powder pigments and carbon black pigments in powder form, many of which are subject to compaction (reagglomeration under pressure), for inorganic pigments in powder form and for pigment preparations in powder or flake form. Method B is appropriate for testing pigments and pigment preparations in granular form and for inorganic pigments in any form.

Technical details

Technical committee: ISO/TC 256 - Pigments, dyestuffs and extenders
SKU: ISO 23900-3:2015

Abstract

Overview

ISO 23900-3:2015 - "Pigments and extenders - Methods of dispersion and assessment of dispersibility in plastics - Part 3" - specifies a laboratory method for assessing the colouristic properties and ease of dispersion of black and coloured pigments in polyethylene (PE) using a two-roll mill. The standard quantifies dispersibility as DH_PE, the percentage increase in colour strength achieved when pigments are further milled at a narrower roll gap. Photometric measurement and colour strength calculations follow ISO 18314-1 and ISO 787-24.

Key topics and requirements

Scope and purpose
- Measures colouristic properties of a test pigment relative to a standard and evaluates ease of dispersion (DH_PE) in polyethylene.
- Two complementary procedures: Method A (powders and flakes, e.g., organic pigments, carbon black, many inorganic powders) and Method B (granules and masterbatches, suitable for inorganic pigments in any form).
Sample preparation
- Typical pre-blend: 100 parts PE + 1.0 part TiO2 (or 5.0 parts for carbon black) plus specified test pigment additions; antioxidant optional for HDPE.
Dispersion procedure (two-roll milling)
- Two-roll mill with roll diameter 80–200 mm; peripheral speed ratio ≈ 1:1.1.
- Initial milling to form sheet at 0.4–0.5 mm gap (140–160 °C typical), cutting and folding every 30 s for a defined number of roll revolutions.
- Further milling at reduced gap (0.3 mm) to evaluate improved dispersion.
Specimen handling and measurement
- Press sheets between high-gloss chrome steel plates (spacer ~1 mm) at up to 160–170 °C, cool rapidly.
- Measure colour strength and colourimetric properties with photometer per ISO 18314-1; compute DH_PE as percentage increase in colour strength (0.3 mm vs 0.5 mm).
Precision and reporting
- Test report must identify product, method, materials, mill conditions, and measured DH_PE. Results are valid for the specified equipment and conditions.

Applications and users

Useful for pigment manufacturers, additive suppliers, plastics compounders, and quality control / testing laboratories to:
- Compare dispersibility of pigments in PE formulations.
- Optimize pigment form (powder vs granule vs masterbatch) and processing conditions.
- Support product specifications, troubleshooting dispersion-related defects (mottling, poor colour strength), and R&D screening.
Particularly relevant where pigment reagglomeration or handling form influences dispersion (e.g., carbon black, organic powders).

Related standards

ISO 23900 series (Parts 1, 2, 4–6) for broader dispersion assessment methods in plastics.
ISO 18314-1 (analytical colorimetry) and ISO 787-24 (tinting strength / photometric methods) referenced for measurement and calculation.

Keywords: ISO 23900-3:2015, pigments, dispersibility, polyethylene, two-roll milling, colouristic properties, ease of dispersion, DH_PE.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Scope and purpose
- Measures colouristic properties of a test pigment relative to a standard and evaluates ease of dispersion (DH_PE) in polyethylene.
- Two complementary procedures: Method A (powders and flakes, e.g., organic pigments, carbon black, many inorganic powders) and Method B (granules and masterbatches, suitable for inorganic pigments in any form).
Sample preparation
- Typical pre-blend: 100 parts PE + 1.0 part TiO2 (or 5.0 parts for carbon black) plus specified test pigment additions; antioxidant optional for HDPE.
Dispersion procedure (two-roll milling)
- Two-roll mill with roll diameter 80–200 mm; peripheral speed ratio ≈ 1:1.1.
- Initial milling to form sheet at 0.4–0.5 mm gap (140–160 °C typical), cutting and folding every 30 s for a defined number of roll revolutions.
- Further milling at reduced gap (0.3 mm) to evaluate improved dispersion.
Specimen handling and measurement
- Press sheets between high-gloss chrome steel plates (spacer ~1 mm) at up to 160–170 °C, cool rapidly.
- Measure colour strength and colourimetric properties with photometer per ISO 18314-1; compute DH_PE as percentage increase in colour strength (0.3 mm vs 0.5 mm).
Precision and reporting
- Test report must identify product, method, materials, mill conditions, and measured DH_PE. Results are valid for the specified equipment and conditions.

Applications and users

Useful for pigment manufacturers, additive suppliers, plastics compounders, and quality control / testing laboratories to:
- Compare dispersibility of pigments in PE formulations.
- Optimize pigment form (powder vs granule vs masterbatch) and processing conditions.
- Support product specifications, troubleshooting dispersion-related defects (mottling, poor colour strength), and R&D screening.
Particularly relevant where pigment reagglomeration or handling form influences dispersion (e.g., carbon black, organic powders).

Related standards

ISO 23900 series (Parts 1, 2, 4–6) for broader dispersion assessment methods in plastics.
ISO 18314-1 (analytical colorimetry) and ISO 787-24 (tinting strength / photometric methods) referenced for measurement and calculation.

Keywords: ISO 23900-3:2015, pigments, dispersibility, polyethylene, two-roll milling, colouristic properties, ease of dispersion, DH_PE.

ISO 23900-3:2015 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Analytical colorimetry - Part 1: Practical colour measurement (ISO 18314-1:2015)

General method of tests for pigments and extenders - Part 24: Determination of relative tinting strength of c…

Pigments and extenders - Methods of dispersion and assessment of dispersibility in plastics - Part 5: Determi…