ASTM D6210-25 PDF

Full title and description

Standard Specification for Fully-Formulated Glycol Base Engine Coolant for Heavy‑Duty Engines — Designation: ASTM D6210-25. Defines fully formulated glycol‑base (ethylene and propylene) concentrates and predilutes intended for heavy‑duty engine cooling systems, including required performance and chemical characteristics for protection against corrosion, cavitation, freezing and boiling.

Abstract

This specification covers fully‑formulated glycol base coolants for heavy‑duty engine cooling systems. It applies when concentrates are used at about 40–60 % glycol by volume in water of suitable quality or when prediluted coolants (50 % minimum) are supplied. Coolants meeting the specification are intended to provide protection against corrosion, cavitation (liner pitting), freezing and boiling, and — when maintained with appropriate supplemental coolant additives (SCAs) — to be suitable for normal service for a minimum of two years. The document also categorizes coolant types (I‑FF, II‑FF, III‑FF, IV‑FF) and addresses use of virgin or recycled glycols with cautionary notes.

General information

• Status: Active standard (current edition D6210-25).
• Publication date: October 1, 2025 (D6210-25).
• Publisher: ASTM International.
• ICS / categories: 71.100.45 (Refrigerants and antifreezes).
• Edition / version: D6210-25.
• Number of pages: 4 pages.

Key bibliographic details and DOI as published by ASTM (short format specification, 4 pages).

Scope

The scope covers requirements for fully‑formulated glycol base coolants for heavy‑duty engines. It specifies recommended concentration ranges (concentrates mixed 40–60 % by volume, or prediluted coolants at a minimum 50 %), intended functions (corrosion, cavitation, freeze and boil protection), suitability when maintained with SCA dosing for at least two years in normal service, and applicability to coolants prepared from virgin or recycled ethylene or propylene glycol (with committee notes and cautions about recycled sources).

Key topics and requirements

• Concentration and product types: concentrate and predilute definitions and four coolant type categories (I‑FF/II‑FF/III‑FF/IV‑FF).
• Performance targets: protection against corrosion, cavitation (liner pitting), scaling, freezing and boiling under expected service conditions.
• SCA management: guidance on initial precharge and maintenance doses where required (particularly wet liner engines) and responsibility of engine/vehicle manufacturers or SCA suppliers for dosing instructions.
• Chemical/ingredient notes: acceptance of ethylene and propylene glycols; committee advisories on purity when recycled glycols are used.
• Referenced performance and test methods commonly used for verification (industry practice cites tests such as corrosion and cavitation screening and other engine/coolant performance methods).

Typical use and users

Used by coolant formulators, engine and vehicle manufacturers, fleet operators (heavy trucks, buses, off‑highway equipment, locomotives, marine and stationary high‑output engines), quality and testing laboratories, and procurement/specification engineers who require standardized performance and compatibility criteria for heavy‑duty engine coolants. Maintenance shops and SCA suppliers also reference the standard for dosing and service intervals.

Related standards

This specification is part of the family of engine‑coolant standards and is commonly referenced alongside standards such as ASTM D3306 (light‑duty glycol coolants), D4985 (low‑silicate ethylene glycol base coolants), D7517 (1,3‑propanediol base coolants), D5752 (supplemental coolant additives), and other ASTM test/specification documents for coolant grade glycols and performance tests. Committee D15 (subcommittee D15.07) develops and maintains related coolant chemistry and performance documents.

Keywords

ASTM D6210-25; glycol base engine coolant; fully‑formulated coolant; heavy‑duty engines; ethylene glycol; propylene glycol; supplemental coolant additive (SCA); cavitation; liner pitting; corrosion protection; predilute; concentrate.

FAQ

Q: What is this standard?

A: ASTM D6210-25 is the ASTM standard specification that defines performance, chemical and product-type requirements for fully‑formulated glycol‑base engine coolants intended for heavy‑duty engines.

Q: What does it cover?

A: It covers concentrate and prediluted glycol coolants (typical mixing ranges noted), required protection against corrosion, cavitation (liner pitting), freezing and boiling, the role of SCAs for maintenance, and guidance on acceptable glycol feedstocks (virgin or recycled, with cautions).

Q: Who typically uses it?

A: Coolant formulators, engine and vehicle OEMs, fleets, service and maintenance facilities, SCA suppliers, and test laboratories use the standard to specify, formulate, test and maintain heavy‑duty engine cooling fluids.

Q: Is it current or superseded?

A: The D6210-25 edition (designation D6210-25) is the current active edition published in 2025 and supersedes earlier editions (for example D6210-17). Users should confirm they are referencing D6210-25 when specifying coolant materials.

Q: Is it part of a series?

A: Yes — it is part of the broader series of ASTM engine‑coolant specifications and test methods maintained by Committee D15 (examples include D3306, D4985, D7517, and associated test methods and SCA specifications).

Q: What are the key keywords?

A: Glycol base engine coolant; fully‑formulated; heavy‑duty; ethylene glycol; propylene glycol; SCA; cavitation; corrosion; predilute; concentrate.