GOST 5066-2018 PDF

Full title and description

GOST 5066-2018 — "Motor fuels. Methods for determination of cloud, crystallization (onset) and freezing points". Establishes test procedures for determining cold‑flow related temperature limits of motor fuels (aviation gasoline, jet fuels and diesel fuels) by controlled cooling and visual observation of clouding, crystal appearance and crystal disappearance.

Abstract

This standard specifies two test methods for assessing low‑temperature behaviour of motor fuels: Method A (aligned with GOST ISO 3013) for determination of the onset of crystallization and freezing temperature, and Method B for determination of cloud point and the onset of crystallization. The methods are intended for laboratory quality control, specification compliance and regulatory testing of liquid motor fuels.

General information

• Status: Active — in force, supersedes GOST 5066-91.
• Publication date: Approved September 27, 2018; date of introduction / entry into force July 1, 2019.
• Publisher: Federal Agency for Technical Regulation and Metrology (Rosstandart) / published via national standards publishers (Standartinform listings).
• ICS / categories: Petroleum and related technologies — Liquid fuels (approx. ICS 75.160.20).
• Edition / version: GOST 5066-2018 (2018 edition, replacing the 1991 version).
• Number of pages: 12 pages (typical published PDF).

Scope

The standard applies to motor fuels — aviation gasoline, jet fuels and diesel fuels — and establishes laboratory procedures for determining cloud point, the temperature at which the first crystals appear (onset of crystallization), and the freezing point (temperature at which crystals disappear on warming or sample solidification criteria). It is intended for use in quality control, type testing and regulatory conformity assessment of liquid motor fuels.

Key topics and requirements

• Definition of cloud point, onset of crystallization and freezing point for motor fuels.
• Method A: procedure aligned with GOST ISO 3013 for determination of crystallization onset and freezing temperature (controlled cooling, observation criteria, apparatus and sample handling).
• Method B: procedure for determination of cloud point and onset of crystallization (cooling rate, observation of turbidity/cloud and first crystals).
• Requirements for sample preparation, test apparatus (thermometers, cooling baths), reagents and laboratory conditions.
• Reporting format, repeatability/precision notes and references to related sampling and handling standards.

Typical use and users

Used by petroleum and aviation fuel testing laboratories, refinery and downstream quality control teams, fuel specification writers, certification and regulatory bodies, and research organisations assessing cold‑flow behaviour of motor fuels. Typical applications include production QC, batch release testing, supplier acceptance testing and regulatory compliance checks for cold‑weather performance.

Related standards

References and related documents frequently cited with GOST 5066-2018 include GOST ISO 3013 (method alignment), sampling and handling standards for petroleum products (e.g., GOST 2517 series), thermometer and reagent specifications, and national fuel specification standards for aviation and diesel fuels (other GOST/GOST R documents). The standard formally replaces GOST 5066-91 and cross-references applicable laboratory and reagent standards.

Keywords

GOST 5066-2018; motor fuels; cloud point; onset of crystallization; freezing point; cold‑flow; diesel; jet fuel; aviation gasoline; fuel testing; GOST ISO 3013.

FAQ

Q: What is this standard?

A: GOST 5066-2018 is a Russian (interstate) standard that specifies laboratory methods for determining cloud point, onset of crystallization and freezing point of motor fuels (aviation gasoline, jet fuels and diesel fuels).

Q: What does it cover?

A: It covers two test methods (Method A — aligned with GOST ISO 3013 — and Method B), requirements for sample handling and apparatus, test procedures for controlled cooling and visual observation, and reporting of results for cold‑flow properties.

Q: Who typically uses it?

A: Fuel testing laboratories, refineries, quality control and procurement teams in the petroleum and aviation sectors, and regulatory or certification bodies responsible for fuel specifications and conformity.

Q: Is it current or superseded?

A: As of its publication it is the current edition (2018) and it supersedes GOST 5066-91. Entry into force occurred in 2019. Users should check national adoption or amendments for the latest applicability in their jurisdiction.

Q: Is it part of a series?

A: It is part of the body of petroleum and fuel testing standards and aligns with relevant ISO/GOST ISO methods (notably GOST ISO 3013). It is commonly used alongside other GOST standards for fuel sampling, reagent and apparatus specifications.

Q: What are the key keywords?

A: Cloud point, crystallization, freezing point, cold‑flow, motor fuels, diesel fuel, jet fuel, aviation gasoline, fuel testing, GOST ISO 3013.