ISO 3679-2022 PDF

Full title and description

Determination of flash point — Method for flash no‑flash and flash point by small scale closed cup tester. This International Standard specifies small‑scale closed‑cup test procedures (three procedures: A, B and C) for determining whether a product will flash at a given temperature (no‑flash) and for measuring flash point values using a small scale closed cup tester.

Abstract

ISO 3679:2022 defines three procedures: Procedure A (rapid equilibrium flash no‑flash pass/fail), Procedure B (rapid equilibrium flash point determination) and Procedure C (automated non‑equilibrium flash point determination). The method is applicable to paints (including water‑borne), varnishes, binders, adhesives, solvents, petroleum products (including aviation turbine, diesel and kerosene fuels), fatty acid methyl esters (FAME) and related products across wide temperature ranges (procedures A/B: −30 °C to 300 °C; procedure C: −20 °C to 300 °C). Precision information and apparatus requirements (small test portions, closed cup apparatus, optional flash detector) are included.

General information

• Status: Published.
• Publication date: November 2022 (corrected French version: May 2023).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.080 (Petroleum products — general), 87.040 (Paints and varnishes).
• Edition / version: Edition 5 (2022).
• Number of pages: 27 (ISO published edition).

Summary information above is taken from the official ISO publication record for ISO 3679:2022.

Scope

ISO 3679:2022 specifies procedures for small scale closed‑cup flash testing: rapid equilibrium Procedures A and B (used for flash no‑flash screening and flash point measurement, respectively) and an automated non‑equilibrium Procedure C. Procedures A and B cover a broad temperature range (−30 °C to 300 °C) and are suitable for paints (including water‑borne), varnishes, adhesives, solvents, petroleum products and related materials; Procedure C is applicable to many petroleum products over −20 °C to 300 °C and includes automated determination with established precision over a defined subrange. The standard also specifies apparatus, sample volumes, verification and reporting requirements.

Key topics and requirements

• Three defined procedures: A (rapid equilibrium no‑flash), B (rapid equilibrium flash point), C (automated non‑equilibrium automated flash point).
• Applicability: paints (including water‑borne), varnishes, adhesives, solvents, petroleum fuels, FAME (with flash detector) and related products across wide temperature ranges.
• Small test portions and small scale closed cup apparatus (normative apparatus description and verification in annexes).
• Precision statements and validated temperature ranges (precision tables provided for applicable ranges, procedure C precision determined over a subrange).
• Guidance for verification, reporting, and routine use for specifications and regulations (procedures A or B commonly used for regulatory/specified limits).

Key technical content and the addition of Procedure C (automated non‑equilibrium) are documented in the 2022 revision.

Typical use and users

Used by industrial and commercial testing laboratories, quality control departments in paint, coatings and adhesive manufacturers, petroleum and biofuel producers (including biodiesel/FAME producers), regulatory bodies and conformity assessment organizations. Typical uses include routine QC/no‑flash screening, specification compliance testing, material safety evaluation and on‑site or laboratory flash point assessment using portable small‑scale closed cup testers.

Related standards

ISO 3679:2022 replaces ISO 3679:2015 (previous edition). Other commonly referenced flash‑point standards include ISO 2719 (Pensky‑Martens closed cup method) and ISO 2592 (Cleveland open cup method); ISO 13736 is cited in the flash‑point family for certain fuel types (kerosene). Choice between these methods depends on sample type, temperature range and regulatory requirements.

Keywords

flash point, flash no‑flash, small scale closed cup, closed cup tester, paints, varnishes, solvents, petroleum products, FAME, biodiesel, procedure A, procedure B, procedure C, precision, verification, ISO/TC 28.

FAQ

Q: What is this standard?

A: ISO 3679:2022 is an International Standard that specifies small‑scale closed‑cup procedures for determining flash no‑flash results and measuring flash point using three procedures (A, B and C).

Q: What does it cover?

A: It covers test methods (rapid equilibrium and automated non‑equilibrium) for paints, varnishes, adhesives, solvents, petroleum products and certain biofuels (FAME) across broad temperature ranges, plus apparatus, verification and precision requirements.

Q: Who typically uses it?

A: QC and R&D laboratories, manufacturers of coatings and fuels, fuel/biodiesel producers, conformity assessment bodies and regulators who need reliable small‑scale closed‑cup flash testing.

Q: Is it current or superseded?

A: Current. ISO 3679:2022 (fifth edition) was published in November 2022 and is the active edition; it replaces ISO 3679:2015. A corrected French-language version was issued in May 2023.

Q: Is it part of a series?

A: It belongs to the family of flash point test standards (examples: ISO 2719 Pensky‑Martens closed cup, ISO 2592 Cleveland open cup, ISO 13736 for certain kerosene testing). Laboratories commonly select the appropriate ISO flash‑point method based on product type and regulatory practice.

Q: What are the key keywords?

A: Flash point, no‑flash, small scale closed cup, closed cup tester, procedure A/B/C, paints, varnishes, solvents, petroleum fuels, FAME, precision, verification.