ASTM D7713-18(2023)

Overview

ASTM D7713-18(2023) is the standard specification established by ASTM International for aqueous engine coolant grade glycol, specifically formulated at a nominal 53% concentration by volume. This standard details requirements for ethylene glycol and propylene glycol used in pre-diluted engine coolants, addressing both virgin and recycled sources. By defining physical and chemical properties, purity requirements, and testing methods, it ensures that coolants meet safety, performance, and compatibility parameters necessary for use in automotive and industrial applications.

The standard supports manufacturers, recyclers, and quality assurance professionals in producing and verifying glycol-based engine coolants that comply with Original Equipment Manufacturer (OEM) expectations.

Key Topics

• Product Types:

  • EG-1 and PG-1: High-purity, likely virgin glycols, suitable for most OEM specifications.
  • EG-2 and PG-2: Virgin or redistilled glycols, suitable for many coolant applications.

• Applicable Glycol Sources:

  • Virgin glycols.
  • Recycled vehicle engine coolants.
  • Glycols from industrial recycling.

• Quality Parameters:

  • Clarity and color (Platinum-Cobalt scale).
  • Relative density at 20/20°C.
  • pH range.
  • Minimum glycol content and limits on impurities.
  • Freezing point and resistance to corrosion-related contaminants.

• Testing Methods: Includes references to validated ASTM and ISO test methods for determining chemical composition, acidity, metals content, freezing point, density, and more.

• Safety and Compliance:

  • Only SI units are accepted as standard.
  • Users are responsible for health, safety, and environmental practices.
  • Regulatory compliance regarding packaging, labeling, and transport is required.

Applications

ASTM D7713-18(2023) provides essential specifications for a wide range of automotive and industrial applications:

• OEM Engine Coolants: Supports the formulation of engine coolants that comply with critical OEM requirements for long service life, corrosion resistance, and freeze protection.
• Recycled Coolant Production: Establishes requirements for recycling and redistilling glycol from used vehicle coolants or industrial byproducts, promoting sustainability.
• Quality Assurance: Used as a benchmark by manufacturers and quality-control laboratories to certify glycol blends prior to distribution.
• Regulatory Compliance: Ensures coolant products meet federal, state, and local transportation and labeling rules.

This specification serves coolant manufacturers, recyclers, automotive OEMs, and testing laboratories, facilitating consistent and reliable engine coolant performance across domestic and international markets.

Related Standards

ASTM D7713-18(2023) references several key testing and terminology standards, essential for conformity evaluation and product development:

• ASTM D1122, D4052, D5931: Measurement of density and relative density.
• ASTM D1177, D6660: Determination of freezing point.
• ASTM D1209: Color measurement.
• ASTM D1287: pH testing.
• ASTM D1613: Acidity determination.
• ASTM D3634, D5827: Analysis for chloride, sulfate, and anions.
• ASTM D6130: Elemental analysis (silicon, metals).
• ASTM E202: Glycol content analysis.
• ASTM D7736: Assay of acids and glycol esters.
• ASTM D4725: Terminology for engine coolants and related fluids.
• ASTM E300: Sampling of industrial chemicals.

Referencing these standards ensures accurate testing and consistent product quality for engine coolant grade glycol as specified in ASTM D7713-18(2023). For further details or purchasing information, consult the ASTM International website.