ISO TR 12245-1994 PDF

Full title and description

ISO/TR 12245:1994 — "Carbon blacks used in rubber products — Classification system". This Technical Report defines a four‑character nomenclature used to classify rubber‑grade carbon blacks by their influence on cure rate, typical particle size group and an assigned two‑digit identifier for grade distinction.

Abstract

This Technical Report provides a classification system for rubber‑grade carbon blacks using a four‑character code: a letter indicating the effect on curing rate, a digit indicating an average particle‑size group, and two arbitrary digits for grade identification. The report lists standard grades and typical properties and notes that assignment of official numbers is the responsibility of the ASTM D‑24 committee.

General information

• Status: Withdrawn (stage: withdrawal of the international deliverable).
• Publication date: June 1994 (1994‑06).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 83.040.20 (Rubber and rubber products).
• Edition / version: Edition 1 (1994).
• Number of pages: 7 pages.

Scope

Specifies a simple, industry‑oriented classification system for rubber‑grade carbon blacks intended for use in rubber products. The system is intended to allow manufacturers, compounders and testing laboratories to identify and compare grades by (a) their typical effect on cure rate, (b) a grouped average particle size category and (c) an arbitrary two‑digit grade identifier; typical properties and example grade listings are included.

Key topics and requirements

• Four‑character nomenclature: 1st character = effect on cure rate (e.g., N = normal, S = slow), 2nd character = particle‑size group digit, 3rd–4th characters = arbitrarily assigned digits for grade identity.
• Ten particle‑size groups defined by typical average particle diameter ranges (group 0: 1–10 nm; group 1: 11–19 nm; group 2: 20–25 nm; group 3: 26–30 nm; group 4: 31–39 nm; group 5: 40–48 nm; group 6: 49–60 nm; group 7: 61–100 nm; group 8: 101–200 nm; group 9: 201–500 nm).
• Provision of typical physical properties and comparative vulcanizate property data for the standard grades (tables of target and typical values).
• Notes on numbering authority: assignment of official numbers for industrial reference blacks is identified as the responsibility of the ASTM D‑24 committee.

Typical use and users

Used by carbon black manufacturers and suppliers, rubber compound formulators, testing laboratories, quality and specification engineers in the rubber industry, and standards committees to classify and communicate about rubber‑grade carbon blacks and to compare typical performance characteristics across grades.

Related standards

Referenced or related documents include test and characterization standards for carbon black such as ISO 4652‑1:1994 (methods for determination of specific surface area of carbon black used in rubber compounding) and other ISO and ASTM test methods that specify measurement procedures used to determine properties referenced in the classification.

Keywords

carbon black; rubber; classification system; nomenclature; particle size groups; cure rate; ASTM D‑24; ISO/TC 45; technical report.

FAQ

Q: What is this standard?

A: It is ISO/TR 12245:1994, a Technical Report providing a classification system for rubber‑grade carbon blacks (four‑character code).

Q: What does it cover?

A: It covers the nomenclature (letter + digit + two digits), particle‑size grouping, example grade listings and typical properties for rubber‑grade carbon blacks and includes guidance on comparative properties of vulcanizates containing those blacks.

Q: Who typically uses it?

A: Carbon black producers, rubber compounders, testing laboratories, specification and quality engineers in the rubber industry, and standards bodies involved in rubber raw‑material classification.

Q: Is it current or superseded?

A: The document is listed as Withdrawn by ISO; users should check the current ISO catalogue or relevant technical committees for any replacement documents or updated guidance before relying on it for new specifications.

Q: Is it part of a series?

A: It is an ISO Technical Report produced under ISO/TC 45 (Rubber and rubber products), SC 3 (Raw materials), rather than a multi‑part numbered series — it is a stand‑alone TR that complements test standards and measurement methods used for carbon black characterization.

Q: What are the key keywords?

A: carbon black, rubber grade, classification, nomenclature, particle size, cure rate, ASTM D‑24, ISO/TC 45.