ASTM D1765-23b PDF

Full title and description

ASTM D1765-23b — Standard Classification System for Carbon Blacks Used in Rubber Products. This document specifies the classification nomenclature and typical properties used to designate commercial carbon black grades for rubber compounding, including the letter/digit coding system and reference property values.

Abstract

This standard defines a four‑character classification system for rubber‑grade carbon blacks, provides typical physical and surface‑property ranges (for example iodine adsorption, oil absorption, structure/DBP), and designates special letters for channel or modified blacks (such as the “S” designation for slow‑cure/channel blacks). It is intended as a reference for product identification and selection in rubber compounding.

General information

• Status: Active / Current edition (D1765-23b).
• Publication date: 15 December 2023 (Document shows edition approved December 2023; published/issued late 2023).
• Publisher: ASTM International.
• ICS / categories: 83.040.20 — Rubber compounding ingredients / carbon blacks.
• Edition / version: D1765‑23b (current revision).
• Number of pages: Approximately 5 pages (short classification table + scope and notes).

Scope

The standard covers classification of rubber‑grade carbon blacks by a short alphanumeric designation that conveys general surface area, structure and any special processing or curing behavior modifications (for example, the “S” suffix for channel or slow‑cure blacks). It includes reference tables of typical properties (iodine adsorption, oil absorption/DBP, and other parameters) used by manufacturers and compounders to compare and select blacks for specific rubber applications. The classification is intended for furnace and other commercial carbon blacks that have not been specially modified to alter cure rate except where explicitly indicated.

Key topics and requirements

• Alphanumeric classification format (letter + digits) indicating type and average surface/structure ranges.
• Designation of special types (e.g., “S” for channel/slow‑cure blacks).
• Reference tables of typical properties (iodine adsorption number, oil absorption/DBP, particle surface area ranges, typical grade names such as industry reference Ns/N designations).
• Cross‑references to ASTM test methods used to measure key properties (examples include methods for iodine adsorption and DBP/oil absorption).
• Notes on intended applicability (rubber‑grade carbon blacks, not specialty blacks modified for non‑rubber uses).

Typical use and users

Typical users include rubber compound formulators, tire manufacturers, carbon black producers and distributors, materials engineers, quality laboratories and purchasing specialists who need a concise, industry‑wide reference for identifying and selecting carbon black grades for elastomer formulations, reinforcement, conductivity and other performance attributes in rubber products.

Related standards

The classification references and is commonly used alongside ASTM test methods for carbon black characterization (for example ASTM methods noted in the standard such as those for iodine adsorption and DBP/oil absorption). It is maintained under ASTM Committee D24 (Carbon Black) and cross‑references other ASTM standards relevant to carbon black testing and rubber compounding.

Keywords

carbon black, classification, D1765, rubber compounding, iodine adsorption, DBP, oil absorption, N220, N330, channel black, slow cure, ASTM D1765-23b, carbon black nomenclature.

FAQ

Q: What is this standard?

A: ASTM D1765-23b is the ASTM classification system that assigns short alphanumeric designations and lists typical property ranges for carbon blacks intended for use in rubber products. It provides a common reference for industry grade identification.

Q: What does it cover?

A: It covers the nomenclature and typical property ranges used to classify rubber‑grade carbon blacks (surface area, structure, oil/DBP absorption, iodine adsorption, and special designations such as channel/slow‑cure types). It is not a test method itself but refers to applicable ASTM test methods for measuring the referenced properties.

Q: Who typically uses it?

A: Carbon black manufacturers, rubber and tire compounders, materials and quality laboratories, specification writers and purchasers in the rubber and elastomers industry.

Q: Is it current or superseded?

A: The D1765-23b edition is the current revision (designated “23b”), published/issued in December 2023; it supersedes earlier 2023 releases (23 and 23a) and represents the latest classification update as of that edition. Users should confirm any subsequent amendments or reissues with ASTM directly.

Q: Is it part of a series?

A: Yes — D1765 is a long‑standing ASTM designation for carbon black classification and has seen multiple revisions and redline releases (for 2023 there are editions/variants noted as 23, 23a and the current 23b). The standard sits within the body of ASTM documents maintained by Committee D24 and is used alongside ASTM test methods for carbon black characterization.

Q: What are the key keywords?

A: Carbon black, classification, rubber compounding, iodine adsorption, oil absorption, DBP, channel black, slow cure, ASTM D1765-23b.