ISO 2719:2025

Overview

ISO 2719:2025 - "Determination of flash point - Pensky‑Martens closed cup method" is the fifth edition of the international standard that defines procedures for measuring the flash point of combustible liquids using the Pensky‑Martens closed cup tester. The standard covers three procedures (A, B and C) for liquids in the temperature range 40 °C to 370 °C, including fuels, biodiesel (FAME), lubricating oils, paints and other homogeneous and heterogeneous liquids. It updates ISO 2719:2016 and includes revised normative annexes and apparatus verification requirements.

Key topics and technical requirements

• Scope and applicability: Specifies which liquids are covered (distillate fuels, residual fuels, biodiesel/FAME, paints/varnishes) and which are excluded (water‑borne paints; kerosene and some lubricants are normally tested with other standards).
• Three procedures:
  • Procedure A: For distillate fuels (diesel, biodiesel blends, heating oil, turbine fuels), new and in‑use lubricating oils, paints and other homogeneous liquids.
  • Procedure B: For residual fuel oils, cutback residuals, used oils, mixtures with solids, high‑viscosity liquids or those forming surface films.
  • Procedure C: Specifically for fatty acid methyl esters (FAME) (e.g., EN 14214, ASTM D6751).
• Apparatus and verification: Detailed requirements and dimensions for the Pensky‑Martens apparatus (normative Annex B), temperature measuring device (Annex C), hot‑wire ignitors/flash detectors (Annex D) and procedures for apparatus verification using reference materials (Annex A).
• Test procedure and controls: Sample preparation, heating/stirring regimes, ignition intervals, interruption of stirring during ignition, temperature correction to standard atmospheric pressure, and result expression.
• Sampling and sample handling: References to relevant sampling standards and treatment of viscous or solid samples.
• Precision and reporting: Repeatability and reproducibility sections and required test report contents.
• Safety note: The standard warns about hazardous materials and the need for appropriate safety measures.

Practical applications and users

ISO 2719:2025 is used by:

• Laboratory and quality control teams in petroleum, biodiesel and lubricant producers
• Fuel testing laboratories and accreditation bodies
• Paints and varnish manufacturers (except water‑borne products)
• Regulatory agencies and transport/storage safety authorities for classification of flammable/combustible materials
• Manufacturers of flash‑point test equipment and proficiency testing schemes

Use cases include compliance testing, product specification, safety classification, detection of volatile contaminants, and routine QC of fuel and oil batches.

Related standards

• ISO 13736 (kerosene testing)
• ISO 2592 (lubricating oils - open cup)
• EN 14214 and ASTM D6751 (FAME/biodiesel specifications)
• ISO 3679 and ISO 1523 (water‑borne paints / highly volatile traces)
• ISO 1513, ISO 3170, ISO 3171, ISO 15528 (sampling and sample prep)
• ISO/TR 29662 (advice on performing flash point tests)

Keywords: ISO 2719:2025, Pensky‑Martens closed cup, flash point testing, combustible liquids, biodiesel, FAME, Procedure A B C, fuel testing, laboratory standards.