ASTM D56-22 PDF

Full title and description

ASTM D56-22 — "Standard Test Method for Flash Point by Tag Closed Cup Tester". This standard specifies the procedures, apparatus, and reporting requirements for determining the flash point of liquids using Tag manual and automated closed-cup testers, intended primarily for low-viscosity volatile liquids with flash points below 93 °C (200 °F).

Abstract

ASTM D56-22 describes a laboratory test method to determine the flash point of liquids by the Tag closed-cup approach. It defines test conditions (low- and high-temperature modes), sample preparation, apparatus verification, test procedure, calculation and reporting requirements, and safety considerations relevant to handling volatile liquids and certain reagents (including advisory notes on mercury use in some instruments). The method is intended for quality control, classification, and regulatory use where a closed-cup flash point is required.

General information

• Status: Active.
• Publication date: July 1, 2022 (ASTM designation D56-22; current edition approved late 2021 and published 01 July 2022).
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: 75.080 (Petroleum products in general); 87.040 (Paints and varnishes).
• Edition / version: D56-22 (current edition).
• Number of pages: 13 pages.

Scope

This test method covers determination of the flash point, by Tag manual and automated closed testers, for liquids with viscosity below 5.5 mm²/s (cSt) at 40 °C or below 9.5 mm²/s (cSt) at 25 °C, and with expected flash point below 93 °C (200 °F). Two test-condition ranges are defined: low-temperature (LT) for expected flash points < 60 °C and high-temperature (HT) for expected flash points ≥ 60 °C. For liquids of higher viscosity, those that form surface films, contain suspended solids, or have flash points ≥ 93 °C, alternate closed-cup methods such as Test Method D93 are recommended.

Key topics and requirements

• Test principle: detection of the lowest temperature at which vapors of a liquid ignite when exposed to an ignition source inside a closed cup (Tag closed-cup method).
• Apparatus: specification and verification of Tag manual and automated closed-cup testers, including ignition device, thermometer, and cup geometry.
• Sample limits: applicable to low-viscosity liquids (viscosity limits and flash point ceiling as noted in the scope).
• Two test condition ranges: defined LT and HT procedures to accommodate expected flash-point ranges.
• Procedure: sample preparation, heating rates, test intervals, ignition application and observation rules, repeatability checks.
• Reporting: required test conditions, measured flash point, units (SI with parentheses for F), and any deviations or anomalies.
• Safety and environmental notes: handling volatile materials, SDS reference, and advisory on mercury use in some instruments where applicable.

Typical use and users

Used by analytical and quality-control laboratories in petroleum, petrochemical, chemical manufacturing, paint and coatings, solvent suppliers, regulatory bodies, and transport safety organizations to classify and control flammability/combustibility of liquid products and to support shipping, storage, and safety decisions. It is also used in product specification testing and acceptance testing by manufacturers and purchasers.

Related standards

Commonly cited and related ASTM methods include Test Method D93 (Pensky‑Martens closed cup), D1310 and D3143 (cut‑back asphalts), D3828, D3278, and D3941. The standard is maintained under ASTM Committee D02 (Petroleum Products, Liquid Fuels, and Lubricants), Subcommittee D02.08 (Volatility).

Keywords

flash point, Tag closed cup, Tag tester, flammable, combustible, petroleum products, solvents, viscosity limits, LT/HT test conditions, closed-cup flash point.

FAQ

Q: What is this standard?

A: ASTM D56-22 is the ASTM International standard test method titled "Standard Test Method for Flash Point by Tag Closed Cup Tester," specifying how to determine the closed-cup flash point of certain low-viscosity liquids using Tag closed-cup apparatus.

Q: What does it cover?

A: It covers test apparatus, sample preparation, LT and HT test procedures, heating rates, ignition and observation practice, calculation and reporting of flash point for liquids with specified viscosity and flash-point limits (flash points below 93 °C / 200 °F). For higher-viscosity fluids, surface-film forming materials, or those with suspended solids, other methods (e.g., D93) are recommended.

Q: Who typically uses it?

A: Laboratory technicians, QC analysts, product developers, safety and compliance officers in petroleum, chemical, paints/coatings, solvents, and transport or regulatory agencies use the method to assess and document flash point for safety classification and quality control.

Q: Is it current or superseded?

A: D56-22 is the current active edition (published July 1, 2022). It revises and replaces prior editions (for example D56-21a). Users should check ASTM records or their subscription services for any subsequent amendments or re-approvals.

Q: Is it part of a series?

A: The method is part of ASTM Committee D02's suite of volatility and flash-point test methods (maintained under Subcommittee D02.08) and is commonly used alongside related closed- and open-cup flash point standards (such as D93).

Q: What are the key keywords?

A: Flash point; Tag closed cup; Tag tester; flammable; petroleum; solvents; viscosity limits; closed-cup method; LT/HT conditions.