ISO/WD 22241-1

Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements

General information

Current stage: 20.20 Effective date: May 23, 2025

Originator: ISO

Owner: ISO/TC 22/SC 34

Type: International Standard

Scope

This document specifies the quality characteristics of the NOx reduction agent AUS 32 (aqueous urea solution) which is needed to operate selective catalytic reduction (SCR) converter systems in motor vehicles with diesel engines. SCR converter systems are particularly suitable for selectively reducing the nitrogen oxide (NOx) emissions of diesel engines.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 22241-1:2019

PUBLISHED
ISO 22241-1:2019/Amd 1:2019

NOW

IN_DEVELOPMENT
ISO/WD 22241-1
20.20 Working draft (WD) study initiated
May 23, 2025