ASTM D891-25 PDF

Full title and description

ASTM D891-25 — Standard Test Methods for Specific Gravity, Apparent, of Liquid Industrial Chemicals. This standard specifies two laboratory procedures for determining the apparent specific gravity (relative density) of liquid industrial chemicals: a hydrometer method (Test Method A) and a pycnometer method (Test Method B). It is used for identity checks, volumetric/weight conversions, and simple composition estimates of liquid chemical products.

Abstract

This concise standard describes accepted laboratory procedures to measure the apparent specific gravity of liquid industrial chemicals at stated temperatures. Two principal methods are defined: a hydrometer technique suitable for routine, rapid checks, and a pycnometer technique that provides greater accuracy and precision for dispute resolution or viscous samples. The standard also clarifies units, temperature reporting, and basic safety considerations when handling test samples.

General information

• Status: Active.
• Publication date: May 1, 2025 (Edition designated D891-25).
• Publisher: ASTM International.
• ICS / categories: Chemical analysis; ICS code commonly referenced for this subject area 71.040.40 (chemical analysis).
• Edition / version: ASTM D891-25 (current edition).
• Number of pages: 5 pages.

Scope

This document covers test methods for determination of the apparent specific gravity (relative density) of liquid industrial chemicals. It provides two test methods: Test Method A by hydrometer and Test Method B by pycnometer. The standard is intended for routine laboratory use where apparent specific gravity is required for identification, conversions between weight and volume, or basic composition checks. An instrumental procedure (Test Method D4052) is referenced as an alternative for density determination.

Key topics and requirements

• Definition of "specific gravity, apparent" and reporting conventions (including temperature notation).
• Test Method A — hydrometer procedure: applicable for fast, routine measurements and samples of low to moderate viscosity.
• Test Method B — pycnometer procedure: described as the more accurate and precise method; preferred for disputes or viscous materials where hydrometer use is impractical.
• Statement that SI units are to be regarded as standard for results and reporting.
• Reference to instrumental density test methods (e.g., D4052) as alternate procedures.
• Basic safety and sample-handling notes, and reminder to consult safety data sheets and regulations before testing.

Typical use and users

Typical users include quality-control and analytical laboratories in chemical manufacturing, reagent suppliers, inspection and testing services, research laboratories, and regulatory or procurement groups that require routine density/specific-gravity checks for liquid industrial chemicals. The standard is used for product identity confirmation, conversions between mass and volume, and simple composition checks in formulation and acceptance testing.

Related standards

Related and cross-referenced standards include ASTM D4052 (instrumental density determination) and other ASTM methods for chemical analysis and sample characterization. Users commonly apply D891 in conjunction with other ASTM test methods for water, color, or purity when evaluating industrial liquids.

Keywords

specific gravity; apparent specific gravity; relative density; hydrometer; pycnometer; liquid industrial chemicals; density measurement; D891-25.

FAQ

Q: What is this standard?

A: ASTM D891-25 is the ASTM International standard that defines laboratory test methods for measuring the apparent specific gravity (relative density) of liquid industrial chemicals using hydrometer and pycnometer techniques.

Q: What does it cover?

A: It covers two test methods — Test Method A (hydrometer) and Test Method B (pycnometer) — including procedures, reporting of temperature and units, and references to instrumental alternatives such as Test Method D4052. The pycnometer method is noted as the more accurate of the two.

Q: Who typically uses it?

A: Quality-control and analytical laboratories, chemical manufacturers and distributors, testing services, and technical personnel who need reliable specific gravity values for identity checks, conversions between mass and volume, or composition estimates.

Q: Is it current or superseded?

A: The edition D891-25 is published in 2025 and is listed as the active edition (D891-25). Check with ASTM International for the absolute current status if you require confirmation beyond the 2025 edition.

Q: Is it part of a series?

A: D891 is part of ASTM’s family of test methods for liquids and chemical analysis; it is commonly used alongside other ASTM test methods and specifications (for example D4052 for instrumental density) but is a standalone test-method standard rather than a volumetric "series" per se.

Q: What are the key keywords?

A: Specific gravity, apparent; relative density; hydrometer; pycnometer; liquid industrial chemicals; density measurement; D891-25.