ASTM D93-25 PDF

Full title and description

ASTM D93-25 — Standard Test Methods for Flash Point by Pensky‑Martens Closed Cup Tester. This standard specifies manual and automated Pensky‑Martens closed‑cup procedures for determining the flash point of petroleum products, biodiesel and related liquids over typical industrial test ranges and includes procedural and reporting requirements for routine laboratory use.

Abstract

ASTM D93-25 describes Pensky‑Martens closed‑cup test procedures (including automated options) to determine the flash point of combustible liquids. The method covers multiple procedures for different sample types and defines apparatus setup, test sequence, calculation and reporting conventions used to produce reproducible flash point values for safety, quality and regulatory purposes.

General information

• Status: Published / Current standard (active).
• Publication date: 15 April 2025.
• Publisher: ASTM International.
• ICS / categories: Typical classifications include ignitability and burning behaviour (13.220.40) and petroleum products (75.080; 75.160.20).
• Edition / version: Designation ASTM D93-25 (2025 edition).
• Number of pages: 20 pages (redline/rlv variants also published).

Scope

These test methods cover the determination of flash point by the Pensky‑Martens closed cup apparatus for petroleum products in the approximate range 40 °C to 370 °C (and biodiesel in specified lower ranges for automated apparatus). The standard defines procedures applicable to distillate fuels, lubricating oils, residual fuels and mixtures with solids or surface films, and it indicates where precision has or has not been established for particular temperature ranges and sample classes.

Key topics and requirements

• Definition and description of manual and automated Pensky‑Martens closed‑cup apparatus and accessories.
• Specified test procedures (commonly referred to as Procedures A, B, and C) for different sample types and viscosities.
• Temperature ranges and heating/stirring regimes, observation and test interval rules, and reporting conventions (including corrections for barometric pressure).
• Requirements for apparatus verification and quality control; the 2025 revision explicitly requires periodic verification using a Certified Reference Material (CRM) to confirm apparatus performance.
• Guidance on precision, limitations (temperatures or sample types where precision is undetermined), and recommended recordkeeping for routine laboratory accreditation and regulatory compliance.

Typical use and users

Used widely by petrochemical, fuel, lubricant and biodiesel testing laboratories, quality control groups, certification/inspection bodies and third‑party testing services to establish flash point for safety classification, shipping, storage and product specifications. It is also used by instrument manufacturers and training providers for method implementation and operator training.

Related standards

Commonly referenced and related standards include other flash‑point methods (e.g., ASTM D92 Cleveland Open Cup and ASTM D1310 Tag Open Cup), and international equivalents such as ISO 2719 (Pensky‑Martens closed cup). Laboratories often consult companion precision statements, material specifications and regulatory documents when applying D93.

Keywords

flash point, Pensky‑Martens, closed cup, ASTM D93-25, flashpoint testing, petroleum products, biodiesel, apparatus verification, certified reference material, laboratory QC

FAQ

Q: What is this standard?

A: ASTM D93-25 is the 2025 edition of the Standard Test Methods for Flash Point by Pensky‑Martens Closed Cup Tester, providing procedures to determine the flash point of petroleum products and related liquids using the Pensky‑Martens closed‑cup apparatus.

Q: What does it cover?

A: It covers manual and automated Pensky‑Martens closed‑cup techniques (Procedures A–C) including apparatus setup, test execution, calculation and reporting of flash point values across defined temperature ranges, plus guidance on precision and limitations.

Q: Who typically uses it?

A: Petrochemical and fuel testing laboratories, lubricant manufacturers, biodiesel producers, regulatory and certification bodies, instrument vendors and any organization that needs defensible flash point data for safety, compliance or specification purposes.

Q: Is it current or superseded?

A: As published on 15 April 2025, ASTM D93-25 is the current active edition; ASTM committee work items indicate routine maintenance and non‑contentious subsequent ballots may occur, so users should confirm the edition before purchasing or applying the method.

Q: Is it part of a series?

A: D93 is part of ASTM petroleum and lubricants test methods maintained by Committee D02; it is commonly used alongside other flash‑point/open‑cup methods, precision statements and related specification standards.

Q: What are the key keywords?

A: Flash point, Pensky‑Martens, closed cup, flashpoint testing, petroleum, biodiesel, CRM, apparatus verification, ASTM D93-25.