ASTM D891-24 PDF

Full title and description

Standard Test Methods for Specific Gravity, Apparent, of Liquid Industrial Chemicals — ASTM D891-24. This standard defines two laboratory procedures for determining the apparent specific gravity (relative density) of liquid industrial chemicals: Test Method A (hydrometer) and Test Method B (pycnometer). It is intended for identity checks, volume/weight conversions, and general compositional or contamination screening of industrial liquids.

Abstract

ASTM D891-24 specifies two classical, laboratory-based procedures to measure apparent specific gravity of liquid industrial chemicals. The hydrometer method provides a simple, rapid determination suitable for routine screening; the pycnometer method provides higher accuracy and is the preferred method when dispute-level precision is required. The standard refers users to instrumental density procedures (for example, Test Method D4052) where appropriate.

General information

• Status: Published / Active (current edition D891-24).
• Publication date: 2024 (current edition D891‑24).
• Publisher: ASTM International.
• ICS / categories: 71.040.40 — Chemical analysis (industrial chemicals).
• Edition / version: D891‑24 (designation D0891‑24; current ASTM edition).
• Number of pages: 5.

Scope

The standard covers determination of apparent specific gravity of liquid industrial chemicals using two laboratory techniques: Test Method A (hydrometer) and Test Method B (pycnometer). It establishes required sample handling, apparatus descriptions, procedural steps, units (SI preferred), and guidance on when to prefer the pycnometer method (higher accuracy) versus the hydrometer (speed and simplicity). Instrumental procedures such as D4052 are noted as alternative methods.

Key topics and requirements

• Two accepted test methods: hydrometer (A) and pycnometer (B).
• Preference for pycnometer method when precision/accuracy are critical; hydrometer acceptable for routine checks.
• Sample conditioning and temperature control to ensure valid relative-density measurements.
• Instrument and glassware calibration, and proper cleaning and handling of pycnometers and hydrometers.
• Reporting conventions (SI units preferred) and statements on limitations and safety considerations for handling industrial chemicals.

Typical use and users

Used by analytical and quality-control laboratories in chemical manufacturing, formulation, blending and supply chains, petrochemical and specialty-chemical producers, regulatory and inspection bodies, and research groups needing a simple, standardized measure of liquid relative density for identity, concentration or contamination screening.

Related standards

Commonly referenced and related ASTM procedures include Test Method D4052 (instrumental density/digital density meters) as an alternative instrumental procedure. Historical or industry-adjacent density/hydrometer procedures (other ASTM density standards) may also be relevant depending on product class and regulatory context.

Keywords

specific gravity, apparent specific gravity, relative density, hydrometer, pycnometer, density measurement, liquid industrial chemicals, ASTM D891, D4052, quality control

FAQ

Q: What is this standard?

A: ASTM D891-24 is a set of standardized laboratory test methods for measuring the apparent specific gravity (relative density) of liquid industrial chemicals using a hydrometer (Test Method A) or a pycnometer (Test Method B).

Q: What does it cover?

A: It covers apparatus, sampling and handling, procedural steps for hydrometer and pycnometer determinations, units and reporting, and guidance on method selection and limitations. Instrumental density methods (e.g., D4052) are noted as alternatives.

Q: Who typically uses it?

A: Analytical and QC laboratories in chemical manufacturing, formulators, petrochemical and specialty-chemical producers, and regulators or inspection labs that require standardized density/relative-density results for identity, concentration, or contamination checks.

Q: Is it current or superseded?

A: The D891-24 edition is the current published ASTM edition (designation D0891‑24). It revises earlier editions (for example D891‑18 and prior versions). For the absolute latest edition or any subsequent revisions, consult ASTM publication records.

Q: Is it part of a series?

A: D891 is part of the family of ASTM test methods and practices for chemical analysis and liquid property measurement; it is commonly used alongside related density and analytical standards such as D4052 (instrumental density determinations) and other committee D16 documents.

Q: What are the key keywords?

A: Specific gravity, apparent specific gravity, relative density, hydrometer, pycnometer, density measurement, liquid industrial chemicals, ASTM D891.