ISO 12922-2020 PDF

Full title and description

Lubricants, industrial oils and related products (class L) — Family H (hydraulic systems) — Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU. This International Standard specifies minimum requirements for unused fire‑resistant and less‑flammable hydraulic fluids intended for general industrial hydrostatic and hydrodynamic applications (not for aerospace or power‑generation applications).

Abstract

ISO 12922:2020 defines property and performance requirements, classification references and key test methods for the H‑family hydraulic fluids listed in ISO 6743‑4 (categories HFAE, HFAS, HFB, HFC, HFDR and HFDU). It distinguishes fluids that meet the ISO definition of “fire‑resistant” from those that are “less flammable,” and provides guidance for suppliers, equipment manufacturers and end users on selection and specification of these fluids.

General information

• Status: Published (current edition confirmed on periodic review).
• Publication date: February 2020 (Edition 3, 2020).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.120 (Hydraulic fluids).
• Edition / version: Edition 3 (2020).
• Number of pages: 11 pages (ISO edition information).

Basic bibliographic and lifecycle details are given in the ISO bibliographic record for ISO 12922:2020; the previous edition ISO 12922:2012 was replaced by this 2020 edition. The 2020 edition was confirmed on review (status confirmed in subsequent ISO lifecycle records).

Scope

Specifies minimum requirements for unused fire‑resistant and less‑flammable hydraulic fluids used in general industrial hydrostatic and hydrodynamic systems. The standard applies to the fluid categories HFAE, HFAS, HFB, HFC, HFDR and HFDU as classified by ISO 6743‑4, and excludes specific aerospace and power‑generation hydraulic fluid requirements. It provides property limits, references to test methods and guidance for suppliers, equipment manufacturers and end users.

Key topics and requirements

• Definition and scope for categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (classification per ISO 6743‑4).
• Minimum physico‑chemical and performance criteria for unused fluids (density, viscosity grading, general cleanliness and specific test outcomes as referenced).
• Distinction between “fire‑resistant” fluids (HFAE, HFAS, HFB, HFC, HFDR) and “less‑flammable” HFDU fluids (terminology referenced to ISO 5598).
• Normative and informative references to established test methods (examples: density and viscosity determination, wick flame persistence, FZG scuffing tests as cited in the standard).
• Guidance on intended application limits (industrial hydrostatic/hydrodynamic systems) and on exclusions (aerospace and power‑generation applications).

These topics are treated as minimum specification requirements and cross‑referenced to ISO classification and test standards.

Typical use and users

Typical users include hydraulic‑fluid manufacturers and suppliers, OEMs of hydraulic equipment, maintenance and reliability engineers, procurement/specification teams, and industrial end users where fire risk or reduced flammability is a consideration (manufacturing plants, metalworking, offshore and heavy industry). It is intended for selection and specification in industrial hydraulic applications rather than aircraft or power‑generation systems.

Related standards

Key related and referenced standards include ISO 6743‑4 (classification of family H hydraulic fluids), ISO 5598 (terminology relevant to fire‑resistant fluids), and specific test method standards cited in ISO 12922 such as ISO 12185, ISO 14635‑1 and ISO 14935. National/adopted versions (for example EN/BS adoptions) exist and may carry additional national forewords or implementation dates.

Keywords

hydraulic fluids; fire‑resistant fluids; less‑flammable fluids; HFAE; HFAS; HFB; HFC; HFDR; HFDU; lubricants; industrial oils; ISO 6743‑4; hydraulic systems.

FAQ

Q: What is this standard?

A: ISO 12922:2020 is an International Standard that specifies minimum requirements and guidance for unused fire‑resistant and less‑flammable hydraulic fluids in specified H‑family categories for general industrial hydraulic systems.

Q: What does it cover?

A: It covers specification limits, classification references, and normative test method references for the fluid categories HFAE, HFAS, HFB, HFC, HFDR and HFDU; it also clarifies which categories are considered “fire‑resistant” and which are “less flammable.” Aerospace and power‑generation hydraulic fluid requirements are excluded.

Q: Who typically uses it?

A: Fluid manufacturers and suppliers, hydraulic equipment OEMs, maintenance and reliability engineers, and procurement/specification teams in industrial sectors where fire performance or reduced flammability of hydraulic fluids is important.

Q: Is it current or superseded?

A: ISO 12922:2020 is the current edition (Edition 3, 2020), which replaced ISO 12922:2012. The 2020 edition has been through ISO’s periodic review process and remains the active edition.

Q: Is it part of a series?

A: ISO 12922 sits within ISO’s class L (lubricants, industrial oils and related products) and references the Family H classification system (ISO 6743‑4). It is therefore part of the broader set of ISO standards covering lubricant classification, terminology and test methods.

Q: What are the key keywords?

A: Hydraulic fluids, HFAE, HFAS, HFB, HFC, HFDR, HFDU, fire‑resistant, less‑flammable, lubricants, ISO 6743‑4.