GOST 8226-2015 PDF

Full title and description

GOST 8226-2015 — "Fuel for engines. Research method for determination of octane number". Establishes the standardized laboratory (research) method for determining the research octane number (RON) of motor gasoline and gasoline components using standard single‑cylinder test engines (CFR and domestic-type installations).

Abstract

This interstate (GOST) standard describes the apparatus, calibration procedures, reference fuels and test sequences needed to determine the research octane number (RON) of spark‑ignition engine fuels and components. It defines measurement ranges, allowable fuel additives (oxygenates up to specified content), required reference mixtures and conditions for obtaining reproducible RON values for quality control, specification compliance and research.

General information

• Status: Replaced by GOST 8226-2022 (GOST 8226-2015 was introduced as a national standard of the Russian Federation and later superseded).
• Publication date: Approved 11 December 2015; date of application (date of introduction) 1 January 2017.
• Publisher: Federal Agency on Technical Regulation and Metrology (Rosstandart) / Interstate standard published as a GOST.
• ICS / categories: 75.160.20 (Fuels — Liquid fuels).
• Edition / version: 2015 edition (GOST 8226-2015).
• Number of pages: 36 pages (electronic format commonly available).

Scope

The standard applies to motor gasolines and their components intended for spark‑ignition engines and specifies a research test method using single‑cylinder four‑stroke engines of CFR type and domestic UIt/AIT type. The method covers RON determination across a broad numerical range (practical working range typically 40–110; equipment-specific ranges up to 120 for CFR, up to ~110 for UIt) and may be used for fuels containing limited amounts of oxygenates (specified mass percent). It also describes the use of primary reference blends (iso‑octane/toluene mixes) to determine octane numbers above 100 without tetraethyllead.

Key topics and requirements

• Definition of research octane number (RON) and its role as a detonation‑resistance characteristic for spark‑ignition engine fuels.
• Test engine types and required test installations (CFR and domestic single‑cylinder installations), including engine operating conditions and calibration.
• Reference fuels and calibration procedure (primary reference blends of iso‑octane and toluene; procedures enabling RON >100 without leaded additives).
• Measurement ranges and required accuracy/repeatability (working range and typical commercial fuel ranges).
• Compatibility with related sampling and laboratory requirements (references to sampling standards and laboratory water quality).
• Alignment and cross‑reference to international method ASTM D2699 (research octane number), indicating harmonization and methodological equivalence where applicable.

Typical use and users

Used by fuel testing and calibration laboratories, refineries and blending facilities, quality control departments, type‑approval and regulatory authorities, research institutes and manufacturers of test equipment (octanometers). The method is intended for routine quality verification, regulatory compliance testing, specification development and research into fuel performance.

Related standards

Key related documents include earlier and later versions of the same method (GOST 8226-82; GOST 8226-2022 replacing the 2015 edition), national fuel specifications (e.g., GOST 32513 series for motor gasoline), sampling and laboratory standards (GOST 2517, GOST 31873, GOST ISO 3696) and the international ASTM test method D2699 for research octane number.

Keywords

octane number; research octane number; RON; motor gasoline; spark‑ignition engine; CFR engine; test method; fuel testing; calibration; reference fuels; iso‑octane; toluene.

FAQ

Q: What is this standard?

A: An interstate (GOST) laboratory method specifying how to determine the research octane number (RON) of motor gasolines and components using single‑cylinder research engines.

Q: What does it cover?

A: The standard covers test apparatus, calibration with primary reference blends, engine operating conditions, test procedures, measurement ranges and reporting for RON determinations, including guidance for fuels with limited oxygenate content.

Q: Who typically uses it?

A: Fuel testing laboratories, refineries and blending plants, regulators and conformity assessment bodies, research organizations and manufacturers of octanometry equipment.

Q: Is it current or superseded?

A: GOST 8226-2015 was introduced into force on 1 January 2017 after approval on 11 December 2015 and has since been superseded by GOST 8226-2022 (the 2022 text is the more recent reference for the research octane method).

Q: Is it part of a series?

A: Yes — it is part of a family of petroleum and fuel test methods and fuel specification standards (GOSTs) dealing with sampling, laboratory conditions and other engine fuel test methods; it also aligns with international test methods such as ASTM D2699.

Q: What are the key keywords?

A: Research octane number (RON), octane, motor gasoline, CFR, test method, reference fuels, iso‑octane, toluene, fuel testing.