ASTM D4672-24 PDF
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St ASTM D4672-24
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Ст ASTM D4672-24
Original standard ASTM D4672-24 in PDF full version. Additional info + preview on request
Full title and description
ASTM D4672-24 — Standard Test Method for Polyurethane Raw Materials: Determination of Water Content of Polyols. This standard specifies Karl Fischer–based procedures (volumetric or coulometric) for measuring the water content of polyols and related organic raw materials used in polyurethane production, and provides requirements and guidance for sample preparation, titration, and reporting of results.
Abstract
This test method describes quantitative determination of water in polyols by Karl Fischer titration. It covers both volumetric and coulometric approaches, reagent considerations (iodine, sulfur dioxide, amine or pyridine substitutes, alcohol solvent), and references precision/bias practices and related interlaboratory procedures. The method is applicable to routine QC, incoming raw‑material inspection, and laboratory R&D for polyurethane raw materials.
General information
- Status: Active / Current standard.
- Publication date: February 1, 2024 (edition designation D4672-24).
- Publisher: ASTM International.
- ICS / categories: 83.040.30 (Auxiliary materials and additives for plastics).
- Edition / version: D4672‑24 (current edition approved Feb 1, 2024).
- Number of pages: 3 pages (concise test method document).
Scope
This standard measures the water content of polyols and many other organic compounds used as polyurethane raw materials. It defines sample preparation, solvents, reagent selection, and the titrimetric procedures (volumetric or coulometric Karl Fischer) required to determine water on a quantitative basis. It also references interlaboratory and precision practices for establishing method reproducibility and equivalence with related methods, including equivalence to ISO 14897 where applicable.
Key topics and requirements
- Karl Fischer titration—both volumetric and coulometric techniques and reagent chemistry.
- Sample dissolution and solvent selection (typical alcohol solvents such as methanol).
- Precision and bias considerations; references to interlaboratory practice (E691) and equivalence evaluation (E2935).
- Reporting requirements for water content results, units, and significant figures.
- Applicability limits and typical interferences encountered in polyol matrices.
Typical use and users
Used by quality control laboratories, raw‑material suppliers, polymer chemists, formulation scientists, and R&D groups in the polyurethane and specialty chemicals industries to verify water content in polyols for process control, specification conformance, and product development. Laboratories performing contract testing and regulatory testing for materials containing polyols will also rely on this method.
Related standards
Relevant and referenced documents include ISO 14897 (equivalent test for polyols), ASTM Terminology D883, Practice E691 (interlaboratory studies for precision), Practice E2935 (evaluating equivalence of testing processes), and earlier editions of D4672 (for historical procedures and changes).
Keywords
Karl Fischer; water content; polyols; polyurethane raw materials; coulometric titration; volumetric titration; ISO 14897; precision; D20.22; sample preparation.
FAQ
Q: What is this standard?
A: ASTM D4672-24 is the ASTM International test method for determining the water content of polyols and related polyurethane raw materials using Karl Fischer titration techniques.
Q: What does it cover?
A: It covers procedures for volumetric and coulometric Karl Fischer titration, sample handling and solvents, reagent considerations, reporting, and references to precision and interlaboratory practices. It is intended for routine QC and laboratory analysis of polyols.
Q: Who typically uses it?
A: Quality control and analytical laboratories, raw‑material manufacturers and suppliers, R&D and formulation scientists in industries that produce or use polyols for polyurethane production.
Q: Is it current or superseded?
A: Current — the D4672‑24 edition was approved and published in 2024 (edition designation D4672‑24, approved Feb 1, 2024). It supersedes prior editions.
Q: Is it part of a series?
A: Yes. D4672 is maintained by ASTM Committee D20 (Plastics) and Subcommittee D20.22 (Cellular Materials — Plastics and Elastomers). It is part of a family of ASTM test methods and references related ASTM practices and ISO documents for plastics and polymer testing.
Q: What are the key keywords?
A: Karl Fischer, water content, polyols, polyurethane, coulometric, volumetric, ISO 14897, D4672.