ASTM E298-25a PDF

Full title and description

ASTM E298-25a — Standard Test Methods for Assay of Organic Peroxides. This standard specifies iodometric procedures for determining the assay (active oxygen/peroxide content) of organic peroxides, providing two sodium‑iodide based test methods for peroxides of differing stability and reducibility.

Abstract

ASTM E298-25a provides standardized analytical procedures to determine the peroxide content of organic peroxide materials by iodometric titration. Two procedures are described: a room‑temperature sodium iodide method for easily reduced peroxides, and a 60 °C sodium iodide method for more moderately stable peroxides. The standard includes sample preparation guidance, reagent specifications, test execution, calculation and reporting rules (including rounding per Practice E29), and safety/handling notes relevant to energetic and oxidizing compounds.

General information

• Status: Active (current edition).
• Publication date: December 1, 2025.
• Publisher: ASTM International.
• ICS / categories: 71.080.99 — Other organic chemicals; Book of Standards volume: 06.04; developed by Subcommittee D16.12.
• Edition / version: ASTM E298-25a (revision of E298-25).
• Number of pages: 7.

Scope

This standard covers test methods for assay (iodometric determination) of organic peroxides. Two procedures are provided: (1) Sodium iodide, room temperature — for organic peroxides that are readily reduced; and (2) Sodium iodide, 60 °C — for organic peroxides that are moderately stable. The standard specifies units, rounding and reporting conventions and notes safety considerations; it does not address every possible hazard and users must establish appropriate safety and environmental practices before use.

Key topics and requirements

• Two iodometric assay procedures using sodium iodide (room temperature and 60 °C).
• Reagent preparation and purity requirements (iodide solutions, acidification, titrant specifications).
• Sample preparation and handling guidance for organic peroxides (stability, dilution, temperature control).
• Calculation of assay results and expression of peroxide content (active oxygen or percent peroxide as specified).
• Rounding and data‑reporting conventions in accordance with Practice E29.
• Safety and hazard notes specific to oxidizing/energetic peroxide materials and required laboratory precautions.
• Limitations and applicability statements for different classes of organic peroxides.

Typical use and users

This standard is used by analytical and quality control laboratories, chemical manufacturers and formulators, regulatory/compliance groups, and research laboratories working with organic peroxides. Typical applications include incoming quality inspection, batch release testing, stability monitoring, formulation verification, and forensic or regulatory testing where peroxide content must be quantified accurately and reproducibly.

Related standards

Commonly referenced and related ASTM documents include Practice E29 (rounding and significant digits) and earlier or adjacent revisions of E298 (previous editions). Other standards and test methods in the D16 committee series and industrial chemistry standards may reference or be cross‑referenced with E298-25a for peroxide testing, sample handling, and safety guidance.

Keywords

organic peroxide; assay; iodometric; sodium iodide; peroxide content; titration; active oxygen; assay method; peroxide stability; analytical chemistry.

FAQ

Q: What is this standard?

A: ASTM E298-25a is a short test‑method standard that describes iodometric procedures for assaying the peroxide content of organic peroxide materials using sodium iodide methods at room temperature and at 60 °C.

Q: What does it cover?

A: It covers reagent and sample preparation, two specific titration procedures (room temperature and 60 °C sodium iodide methods), calculation and reporting conventions, and basic safety/handling notes relevant to organic peroxides. It specifies how to express results and how to round them in accordance with Practice E29.

Q: Who typically uses it?

A: Analytical chemists, QC laboratories in chemical manufacturing, formulators, regulatory testing labs, and other professionals who must quantify peroxide content for quality, safety, or compliance purposes.

Q: Is it current or superseded?

A: E298-25a is the active revision of the E298 series (it replaces earlier E298 editions). Users should confirm they are using the latest available revision before testing.

Q: Is it part of a series?

A: It belongs to the ASTM E298 series of test methods for organic peroxides and sits within the D16 committee portfolio (industrial chemicals/organic materials). It is often used alongside related ASTM practices such as Practice E29 for rounding and other D16 test methods.

Q: What are the key keywords?

A: Assay, iodometric, sodium iodide, organic peroxide, peroxide assay, titration, active oxygen, analytical test method.