ASTM D3265-24a PDF

Full title and description

ASTM D3265-24a — Standard Test Method for Carbon Black—Tint Strength. This method specifies the procedure for determining the tint strength of carbon black relative to an industry tint reference black (ITRB), including recommended sample preparation, measurement technique, and reference materials used to report tint values for commercial rubber-grade carbon blacks.

Abstract

This standard defines a laboratory test for quantifying the tinting strength of carbon black using a carbon black–zinc oxide paste compared to an industry tint reference black (ITRB). It describes accepted mixing methods (Automatic Muller apparatus as primary; alternative SpeedMixer guidance), applicable sample types (notably N100–N300 series and other commercial rubber grades), unit conventions (SI preferred), and notes on factors that can influence results (particle size, structure, aggregate distribution and specific raw material interactions).

General information

• Status: Active (current edition D3265-24A).
• Publication date: 2024 (current edition published/released January 1, 2024; edition approved November 1, 2023 / redline/updates noted in 2024).
• Publisher: ASTM International.
• ICS / categories: 83.040.20 (rubber compounding ingredients / carbon black properties).
• Edition / version: D3265-24A (current active revision of D3265 series).
• Number of pages: 6 pages (concise test method document).

Scope

This test method covers the determination of the tint strength of carbon black relative to an industry tint reference black (ITRB). It applies primarily to commercial rubber-grade carbon blacks (notably N100, N200 and N300 series) and addresses recommended apparatus, reference materials, mixing procedures, and reporting conventions; users are reminded that tint strength correlates with but is not solely determined by primary particle size (structure and aggregate distribution also influence results).

Key topics and requirements

• Definition and measurement of tint strength relative to ITRB reference black.
• Sample preparation: Automatic Muller apparatus specified as the reference mixing method; alternative Hauschild SpeedMixer discussed with limitations for certain grades (tread and high surface area specialty blacks).
• Use of a carbon black–zinc oxide paste and photo-electric reflectance measurement to determine tint values.
• Reporting in SI units (values in parentheses permitted for information only).
• Notes on applicability and interpretation: tint strength influenced by particle size, structure and aggregate size distribution; precision and dispute-resolution guidance (use Automatic Muller where disputes arise).
• Statement on safety and user responsibility for safe handling and regulatory compliance.

Typical use and users

Used by carbon black manufacturers, rubber compounders, analytical and QC laboratories, R&D teams, and standards/regulatory bodies to characterize and compare tinting strength of carbon black products. Common applications include quality control, lot acceptance testing, supplier qualification, and product specification development for rubber and polymer compounding.

Related standards

Related ASTM documents and cross-references include earlier and adjacent D3265 editions (for historical precision statements), and other D24 committee standards that reference or complement tint measurements (examples reported in catalogues: D1765, D3053, D4122, D4821, D5817, D6915, D7849). Users should consult the latest ASTM index or committee D24 publications for complete cross-reference lists and any normative/informative references listed in the standard.

Keywords

carbon black; tint strength; ITRB; tint reference black; Automatic Muller; SpeedMixer; photo-electric reflectance; rubber grade; D24 subcommittee.

FAQ

Q: What is this standard?

A: ASTM D3265-24a is the ASTM test method that specifies how to determine the tint strength of carbon black relative to an industry tint reference black (ITRB), used for characterizing commercial rubber-grade carbon blacks.

Q: What does it cover?

A: It details sample preparation, recommended mixing apparatus (Automatic Muller as primary), measurement technique (paste formulation and reflectance measurement), reporting conventions (SI units), and notes on factors affecting tint values (particle size, structure, dispersion).

Q: Who typically uses it?

A: Carbon black producers, rubber and polymer compounders, QA/QC laboratories, and R&D personnel use this method for product characterization, specification compliance, and comparative testing.

Q: Is it current or superseded?

A: The D3265-24A edition is the current active version (revision released in 2024 and marked active in ASTM catalogs). Users should always confirm they hold the latest approved edition before testing.

Q: Is it part of a series?

A: Yes — D3265 is part of the D24 committee’s carbon-black standards family (series of methods covering surface area, structure, tinting, and other carbon black properties) and has prior editions and amendments; D3265-24A supersedes earlier D3265 revisions.

Q: What are the key keywords?

A: Carbon black, tint strength, ITRB, Automatic Muller, SpeedMixer, reflectance, rubber grade, D3265.