ASTM D7042-25 PDF

Full title and description

Standard Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic Viscosity) — test method specifying concurrent measurement of dynamic viscosity and density using a Stabinger-type viscometer, and the calculation of kinematic viscosity from those values.

Abstract

This standard defines a procedure for the concurrent measurement of dynamic viscosity (η) and density (ρ) of liquid petroleum products and crude oils (transparent and opaque) using a Stabinger viscometer; kinematic viscosity (ν) is calculated as η/ρ. The method is intended primarily for Newtonian fluids and reports in SI units; precision and bias are specified for particular materials and temperature/viscosity ranges.

General information

• Status: Active.
• Publication date: May 1, 2025 (D7042-25 edition published in 2025).
• Publisher: ASTM International.
• ICS / categories: ICS 17.060 (measurement of volume, mass, density, viscosity).
• Edition / version: D7042-25 (active edition).
• Number of pages: 13.

Scope

The test method covers and specifies a procedure for the concurrent measurement of dynamic viscosity and density of liquid petroleum products and crude oils by Stabinger viscometer, and the subsequent calculation of kinematic viscosity at the same test temperature. It is intended for liquids that exhibit primarily Newtonian flow behavior and includes precision/bias information only for specified materials, temperature ranges and viscosity/density ranges. Users are reminded the method does not address all safety concerns and that SI units are the standard of record.

Key topics and requirements

• Measurement technique: Stabinger-type viscometer combining dynamic-viscosity and density measurement in one instrument.
• Outputs: dynamic viscosity (η), density (ρ) and calculated kinematic viscosity (ν = η/ρ).
• Applicable materials: petroleum products, crude oils and similar liquids; primarily Newtonian fluids.
• Temperature control: measurements performed at controlled test temperatures; results reported in SI units with specified temperature stability/precision requirements.
• Precision & bias: precision statements provided for listed sample groups and conditions—applicability outside those ranges requires user validation.
• Instrument/verification: requires instrument calibration, verification and appropriate sample handling to meet stated precision limits.

Typical use and users

Used by petroleum and fuel testing laboratories, refinery QC groups, instrument manufacturers and calibration/service providers. It is commonly employed where rapid, repeatable viscosity and density data are needed for quality control, product specifications, storage/handling decisions and laboratory R&D. Instrument vendors who supply Stabinger viscometers reference and support this method for industry compliance.

Related standards

Closely related to international/European counterparts and complementary test methods such as ISO/EN standards for kinematic-viscosity determination by Stabinger-type viscometer (ISO 23581 / EN ISO 23581 series) and other viscosity/density methods (for example ASTM D445, ASTM D4052 and ISO methods for density/viscosity where applicable). Many industry product standards and fuel specifications reference or rely on D7042 for viscometric inputs.

Keywords

Stabinger viscometer, dynamic viscosity, density, kinematic viscosity, petroleum products, crude oil, viscosity measurement, viscosity index, temperature scanning, Newtonian fluids.

FAQ

Q: What is this standard?

A: ASTM D7042-25 is a Standard Test Method that specifies how to measure dynamic viscosity and density of liquids concurrently using a Stabinger-type viscometer and how to calculate kinematic viscosity from those measurements.

Q: What does it cover?

A: It covers procedures for measurement, required instrument characteristics, sample handling, test temperatures, calculation of kinematic viscosity (η/ρ), and precision/bias statements for specified materials and ranges; it is aimed at predominantly Newtonian liquids such as many petroleum products.

Q: Who typically uses it?

A: Petroleum/fuel laboratories, refinery QC, instrument manufacturers and calibration labs use D7042 for routine and reference viscometry where combined viscosity and density data are desired. Vendors of Stabinger viscometers commonly support this method.

Q: Is it current or superseded?

A: The D7042-25 edition is the active (current) ASTM edition issued in 2025; users should check ASTM records or their national standards provider for the latest edition or any amendments.

Q: Is it part of a series?

A: D7042 is part of a family of viscosity and density test methods and is frequently cross‑referenced by other industry standards (including ISO/EN equivalents and related ASTM viscosity/density methods). It is maintained by ASTM Committee D02 and its subcommittees.

Q: What are the key keywords?

A: Stabinger viscometer; dynamic viscosity; density; kinematic viscosity; petroleum products; Newtonian flow behavior; viscosity index; temperature-controlled viscometry.