ISO 22241-1:2019/Amd 1:2019

Overview

ISO 22241-1:2019/Amd 1:2019 is an amendment to the international standard that specifies quality requirements for the NOx reduction agent AUS 32, primarily used in diesel engine exhaust aftertreatment systems. Published by the International Organization for Standardization (ISO), this document ensures that AUS 32, commonly known as AdBlue® or Diesel Exhaust Fluid (DEF), consistently meets stringent quality criteria vital for effective nitrogen oxide (NOx) emissions reduction in road vehicles.

This amendment updates key definitions and notes within the existing standard, ensuring clarity and uniform interpretation for manufacturers, suppliers, and end users in the automotive industry.

Key Topics

• AUS 32 Quality Requirements
  • Ensures that the NOx reduction agent meets industry-accepted chemical and physical standards.
  • Provides consistency for AUS 32 used in SCR (Selective Catalytic Reduction) systems.
• Updated Definitions
  • Adds specific clarification on water quality, referencing ISO 3696 water grade 3.
  • Refines the definition of refractive index in relation to the sodium D line's optical velocity.
• Terminology Alignment
  • Maintains harmonization of technical language across automotive and chemical sectors for enhanced compliance and communication.
• Regulatory and Patents Notice
  • Highlights that elements of the document may be associated with patent rights and references procedures for ensuring conformance.

Applications

The standard amendment has practical applications across the diesel vehicle value chain:

• Automotive Industry
  Manufacturers and suppliers rely on ISO 22241-1 standards to ensure SCR systems function efficiently and reliably by using AUS 32 that meets specified purity and composition requirements.
• Transport Fleets and Operators
  Guarantees that purchased DEF/AUS 32 products are compatible with modern emission control units, reducing risk of system malfunctions and maintaining regulatory compliance for vehicle emissions.
• Chemical Producers and Distributors
  Provides a clear, internationally recognized benchmark for production and quality control of AUS 32, supporting market access and traceability.
• Testing Laboratories Aligns measurement and testing procedures for AUS 32 with industry best practices, contributing to consistent product quality across markets.

Using AUS 32 of certified quality directly supports efforts to minimize diesel engine NOx emissions, facilitating adherence to stringent environmental standards and promoting public health.

Related Standards

Organizations working with diesel engine emissions and reduction agents should also be aware of related documents in the ISO 22241 series and supporting standards:

• ISO 22241-1:2019 - Diesel engines - NOx reduction agent AUS 32 - Part 1: Quality requirements
• ISO 22241-2 - Test methods for AUS 32 quality verification
• ISO 22241-3 - Handling, transportation, and storage requirements for AUS 32
• ISO 3696 - Reference for water quality used in laboratory and industrial processes
• ISO/TC 22 - Technical Committee for Road Vehicles, covering propulsion systems and fluids

Adhering to ISO 22241-1:2019/Amd 1:2019 and its related standards is essential for ensuring environmental compliance, optimizing vehicle performance, and fostering global standardization in NOx reduction agent quality for diesel engines.