ASTM D4527-18 (2023) PDF

Full title and description

ASTM D4527-18 (reapproved 2023) — Standard Test Method for Carbon Black—Solvent Extractables. This standard specifies procedures to determine the total material extractable from carbon black by organic solvents (commonly toluene) and to fractionate the extract to estimate the aromatic/polar portion using silica-gel column elution with cyclohexane.

Abstract

This test method describes two related procedures: Method A (total solvent-extractable material determined by Soxhlet or equivalent extraction with toluene or other specified solvents) and Method B (fractionation of the extract by silica-gel adsorption and cyclohexane elution to quantify the non‑aromatic fraction, with the difference taken as the aromatic/polar fraction). Results are reported as mass percent extractable material of the carbon black sample. The standard includes apparatus, reagent purity, sample preparation, calculation, and acceptability criteria for blanks and extraction performance.

General information

• Status: Active — D4527-18 reapproved (R23) / current as of reapproval in 2023.
• Publication date: Reapproved January 1, 2023 (original D4527-18 edition 2018).
• Publisher: ASTM International.
• ICS / categories: 83.040.20 (Rubber compounding ingredients).
• Edition / version: D4527-18 (reapproved 2023), often referenced as D4527-18R23.
• Number of pages: 3–4 pages (short test method document).

Scope

This test method covers the procedure for measuring solvent-extractable material in carbon black. It determines the total material extractable by toluene (or other designated solvents) under specified conditions (Method A). Method B separates the cyclohexane-elutable portion on silica gel to estimate the non‑aromatic fraction; subtraction yields the aromatic/polar fraction. The test is intended for routine quality control and material characterization of carbon black used in rubber and other applications.

Key topics and requirements

• Sample preparation and representative sampling of carbon black.
• Soxhlet (or equivalent) extraction apparatus and conditions (solvent volume, extraction time/cycles, thimble specifications).
• Use of high-purity solvents (toluene for total extract; cyclohexane for silica-gel elution) and control of residue limits for solvents.
• Silica-gel column adsorption and fractionation procedure to separate cyclohexane-elutable fraction (Method B).
• Evaporation, residue drying (vacuum/oven), and analytical balance requirements for mass-percent calculations.
• Blank and apparatus cleaning procedures to avoid contamination by carbon black; limits for acceptable blanks.
• Calculation and reporting of percent extractables and aromatic/polar fraction; references to precision/practice documents for evaluating repeatability.

Typical use and users

Used by carbon black producers, rubber and polymer compounding quality control laboratories, material specification teams, battery and conductive-additive manufacturers, and research/analytical laboratories that characterize impurity or extractable content in carbon black. Typical purposes include incoming quality inspection, specification compliance, batch characterization, and R&D comparisons.

Related standards

Related or historically linked documents include earlier versions of D4527 (for example D4527-99), ASTM precision and practice standards referenced in the test (such as practices for evaluating precision), and other ASTM methods for carbon black characterization used in the same volume (Book of Standards, Vol. 09.01). Laboratories often consult these companion standards for precision statements and supplementary test methods.

Keywords

carbon black, solvent extractables, toluene extract, cyclohexane, silica gel, Soxhlet extraction, extractable fraction, aromatic/polar fraction, D4527-18, ASTM.

FAQ

Q: What is this standard?

A: ASTM D4527-18 (reapproved 2023) is a short ASTM test method that defines procedures to measure solvent-extractable material in carbon black and to fractionate that extract to estimate aromatic/polar components.

Q: What does it cover?

A: It covers Method A (total extractables using toluene or equivalent solvents) and Method B (silica-gel/cyclohexane fractionation), including apparatus, reagents, sample handling, calculation and reporting of mass-percent extractables.

Q: Who typically uses it?

A: Carbon black manufacturers, rubber compounding and polymer labs, quality control and R&D groups, and any laboratory needing to quantify extractable organic material in carbon black.

Q: Is it current or superseded?

A: The D4527-18 edition was reapproved in 2023 (often cited as D4527-18R23); it is listed as current/reapproved rather than superseded at the time of reapproval. Users should check ASTM’s catalogue for any later revisions after 2023.

Q: Is it part of a series?

A: It is part of the suite of ASTM carbon black and rubber testing standards maintained by Committee D24 (and subcommittee D24.31 for non-carbon black components). Related carbon black standards and historical versions (for example D4527-99) exist in the same Book of Standards volume.

Q: What are the key keywords?

A: carbon black, solvent extractables, toluene extract, cyclohexane, silica gel, Soxhlet extraction, extractable fraction, aromatic fraction, ASTM D4527-18.