ISO 22241-1:2019 – Diesel Engines – NOx Reduction Agent AUS 32

What is the purpose of ISO 22241 series?

The primary goal of the ISO 22241 series is to ensure the safe, effective, and durable use of AUS 32 in reducing NOx emissions from diesel engines. It also ensures compatibility with SCR systems, preventing failures due to impurities or degradation.

The ISO 22241 series includes the following parts:

Quality Requirements for AUS 32

Chemical Composition (as per ISO 22241)

Physical Properties

All parameters must be measured using methods specified in ISO 22241-2, ensuring consistency and reproducibility.

Ensuring your DEF or AdBlue® meets these specifications? Contact support@pacificcert.com!

Key Requirements from Other Parts of ISO 22241

ISO 22241-2 – Test Methods

Specifies standardized laboratory test methods to verify compliance with Part 1. Methods include:

• Titration for urea content
• ICP-OES for metals
• Gravimetric methods for insolubles
• UV spectroscopy for aldehydes

ISO 22241-3 – Handling and Storage

Highlights critical precautions such as:

Use of stainless steel or specific plastics (HDPE) for tanks and pipes

Avoiding contact with non-compatible materials (e.g., copper, brass)

Storing between -11°C and 30°C to prevent freezing and decomposition

Protecting from direct sunlight and contamination

ISO 22241-4 & 22241-5 – Refilling Interface

Specifies standardized nozzle and tank interface dimensions to prevent misfilling and ensure ease of use for:

Light-duty vehicles (passenger cars)

Heavy-duty commercial vehicles (trucks and buses)

ISO 22241-6 – Quality Assurance Guidelines

Covers quality management in AUS 32 production and supply chain, including:

Batch control

Lab testing protocols

Tank cleaning procedures

Packaging integrity

Want to align with all ISO 22241 parts? Reach out to support@pacificcert.com.

How to Implement ISO 22241?

1. Urea must meet automotive-grade specifications with minimal biuret and heavy metals.
2. Implement batch testing using ISO methods. Maintain detailed logs and certificates of analysis (COAs).
3. Use ISO 22241-3 guidelines for materials compatibility, temperature controls, and contamination prevention.
4. Ensure packaging is marked with:
   • “AUS 32” or equivalent trademark
   • Production date and batch number
   • Storage temperature instructions
5. Educate personnel and logistics providers on ISO 22241 requirements, especially for temperature-sensitive transport.

Need support? Contact us at support@pacificcert.com!

Documentation Required

To demonstrate compliance, maintain:

1. Test results for each production batch
2. Supplier certificates for urea and water
3. Storage and transportation records
4. Equipment calibration and tank cleaning logs
5. Customer complaint handling and traceability records

What are the benefits of ISO 22241?

• Protects vehicle engines from damage caused by contaminated or incorrect DEF.
• Ensures compliance with emissions regulations (Euro VI, US EPA Tier 4).
• Trusted certification ensures product quality from manufacturing to delivery.
• Retailers and fleet operators prefer certified AUS 32 products to minimize warranty and emissions failures.
• Contaminated DEF can clog injectors, damage SCR catalysts, and trigger costly repairs.
• It’s compliance is often required for AUS 32 to be sold in international markets.

The global push for decarbonization and air quality improvement is accelerating adoption of clean diesel technologies. ISO 22241-compliant AUS 32 is central to these efforts:

• The global DEF market is projected to reach USD 55 billion by 2028, growing at over 7% CAGR
• As of 2025, over 90% of commercial diesel vehicles in Europe and North America rely on SCR systems requiring AUS 32
• Emerging economies (e.g., India, Brazil) are implementing Bharat Stage VI and Proconve P8 regulations, which also adopt ISO 22241-based frameworks

Maintaining ISO 22241-1 compliance is now a regulatory necessity. Need help preparing for new regulations or market expansion? Contact support@pacificcert.com!

How Pacific Certifications Can Help?

We provide full support for ISO series compliance, including:

• Testing coordination through accredited laboratories
• Process audits and supply chain assessments
• Quality documentation preparation
• Training for production, transport, and retail teams
• Support for private label DEF brand certification
• Integration with ISO 9001, ISO 14001, and ISO 45001 systems

From urea manufacturers to truck fleet suppliers, we ensure ISO compliance from production to pump. Get certified and protect your product integrity—email support@pacificcert.com!