Marine Grade · ISO 18611 Certified · IMO Tier III Compliant
AUS 40
Marine Urea Solution
Australia’s trusted supplier of ISO 18611-certified AUS 40 — aqueous urea solution 40% for marine Selective Catalytic Reduction systems. Reduce vessel NOx emissions by up to 90% and achieve full IMO Tier III compliance. Nationwide IBC delivery.
Supply Ports:
Melbourne
Sydney
Adelaide
Darwin
Brisbane
Perth
ISO 18611-1:2014 Certified
Australian Made
Marine SCR Systems
IMO Tier III Compliant
1000L IBC Supply
Nationwide Delivery
About This Product
What Is AUS 40?
AUS 40 (Aqueous Urea Solution 40%) is a clear, colourless, high-purity liquid consisting of 40% urea dissolved in deionised water. It is the marine equivalent of AdBlue — formulated specifically for Selective Catalytic Reduction (SCR) systems aboard marine vessels, where it plays a critical role in reducing harmful nitrogen oxide (NOx) emissions by up to 90%.
Unlike AdBlue (AUS 32) which contains 32.5% urea for road diesel vehicles, AUS 40 uses a higher 40% urea concentration optimised for the exhaust temperatures and flow characteristics of marine diesel engines and boilers. The two products are not interchangeable — using the wrong concentration will damage SCR catalysts and compromise emission control performance.
Bauly Chemicals supplies ISO 18611-certified AUS 40 nationwide from depots in Melbourne, Sydney, Brisbane, Adelaide, Perth, and Darwin. All product is manufactured in Australia to the highest quality standards, supporting IMO Tier III NOx compliance for operators in Emission Control Areas worldwide.
- 40% high-purity urea dissolved in deionised water
- Certified to ISO 18611-1:2014 — the marine urea solution standard
- Supports IMO Tier III NOx emission compliance
- Reduces marine NOx emissions by up to 90%
- Compatible with all marine SCR systems — engines, boilers, hybrid
- Non-hazardous, non-flammable, safe to store and handle onboard
- Australian-made — supplied in 1000L IBC format
- Safety Data Sheet (MSDS) available on request
AUS 40 - 1000L IBC
ISO 18611-certified · Australian Made · Marine Grade
Product Specification — AUS 40
Chemical Name
Aqueous Urea Solution 40%
Common Name
AUS 40 / Marine DEF
Urea Content
40% ± tolerance
Quality Standard
ISO 18611-1:2014
Application
Marine SCR Systems
Appearance
Clear, colourless, odourless
Freezing Point
-11°C
Storage Temperature
0°C to 30°C
Shelf Life
Up to 12 months
Packaging
1,000 litres
Flash Point
Non-flammable
Hazard Class
Non-hazardous
Manufacturing
🇦🇺 VDA-Licensed, Australian
AUS 40 vs AdBlue
What's the Difference Between AUS 40 and AdBlue?
Both products use urea to reduce NOx emissions via SCR, but they are formulated for completely different applications and must never be used interchangeably.
⚓
AUS 40
Marine Grade
Urea Content
40%
Standard
ISO 18611
Application
Marine SCR
Regulation
IMO Tier III
Format
1000L IBC
AdBlue (AUS 32)
Road / Off-Road Grade
Urea Content
32.5%
Standard
ISO 22241
Application
Road / Off-Road
Regulation
Euro 5 / Euro 6
Format
10L, 205L, 1000L, Bulk
⚠️ AUS 40 and AdBlue are not interchangeable. Always use the correct product for your SCR system.
How It Works
How AUS 40 Reduces Marine NOx Emissions
AUS 40 works through a four-stage catalytic process that converts toxic nitrogen oxides from marine engine exhaust into harmless nitrogen and water vapour.
AUS 40 Stored Onboard
AUS 40 is stored in dedicated onboard tanks made of stainless steel, HDPE, or approved plastics. Dosing systems inject AUS 40 precisely based on engine load and exhaust conditions.
Injected into Exhaust Stream
AUS 40 is injected upstream of the SCR catalyst into the hot exhaust gas stream (200–400°C), where the heat causes the urea to decompose into ammonia (NH₃) and CO₂.
Catalytic Reaction
Inside the SCR catalyst unit, the ammonia reacts with NOx in the exhaust. Vanadium, titanium, or zeolite catalysts facilitate the reaction without being consumed.
Clean Emissions
The catalytic reaction converts NOx into harmless nitrogen (N₂) and water vapour (H₂O) — both naturally present in the atmosphere — achieving up to 90% NOx reduction.
4NH₃ + 4NO + O₂ → 4N₂ + 6H₂O
Standard SCR Reaction — Ammonia + Nitric Oxide → Nitrogen + Water
Up to 90%
NOx Reduction
ISO 18611
Marine Standard
Product Features
Key Features of Bauly Chemicals AUS 40
Purpose-built for marine SCR environments — engineered for reliability, purity, and compatibility with the full range of marine propulsion and auxiliary systems.
High-Purity Formulation
40% high-purity urea in deionised water, meeting ISO 18611-1:2014 specifications. Extremely low impurity levels — aldehydes, phosphates, and metals controlled to prevent catalyst poisoning and extend SCR catalyst lifespan.
Marine-Specific Formulation
Specifically designed for marine SCR systems — tolerates the unique challenges of maritime environments including high humidity, temperature fluctuations, extended storage during voyages, and corrosive onboard conditions.
Low Viscosity — Easy to Dose
The water-based, low-viscosity formula pumps, transfers, and injects cleanly. Enables precise, consistent dosing by electronic control units — critical for optimising NOx reduction while minimising AUS 40 consumption per voyage.
Non-Corrosive to Approved Materials
AUS 40 is non-corrosive when stored in stainless steel, HDPE, or other ISO 18611-approved materials. Protects tanks, piping, and dosing systems from degradation, ensuring long-term operational reliability onboard.
Non-Hazardous & Non-Flammable
AUS 40 carries no dangerous goods classification — no hazardous material protocols, no specialised ventilation, no combustibility risk. Safe to store in confined shipboard environments and during cargo operations.
Environmentally Certified
Certified ISO 18611-1:2014 and fully aligned with IMO NOx Technical Code requirements. Enables compliant operation in ECAs worldwide — North Sea, Baltic Sea, North American coastal zones, and the growing global ECA network.
Marine Applications
Which Vessels & Systems Use AUS 40?
AUS 40 is compatible with all marine SCR-equipped vessels and engine types operating under IMO Tier III NOx regulations.
Main Propulsion Engines
Large two-stroke and four-stroke diesel engines powering cargo ships, container vessels, bulk carriers, tankers, and car carriers. AUS 40 enables Tier III NOx compliance for the highest-emission engine category without sacrificing propulsion performance.
Cargo · Tanker · Container · Bulk Carrier
Auxiliary Engines & Generators
Smaller four-stroke diesel engines providing onboard electrical power generation — hotel loads, refrigeration, and cargo handling systems. Auxiliary engines can account for a significant portion of total vessel NOx output and require AUS 40 in ECA zones.
Power Generation · Hotel Load · Refrigerated Cargo
Marine Boilers
Steam boilers used for heating, cargo conditioning, or steam turbine propulsion. Marine boilers generate significant NOx emissions and benefit from SCR treatment with AUS 40, particularly on vessels operating in North Sea and Baltic ECAs.
Steam · Cargo Heating · Tanker Systems
Ferries, Cruise & Passenger Vessels
Passenger vessels operating coastal routes, port-to-port services, and harbour areas where ECA compliance and public health air quality standards are strictly enforced. AUS 40 enables clean, compliant operation close to urban coastlines.
Ferry · Cruise · Ro-Ro · Harbour Craft
Offshore & Workboats
Platform supply vessels, anchor handlers, offshore support craft, and dredgers operating in ECAs or under stringent Port State Control requirements. AUS 40 supports Tier III compliance for vessels working in close proximity to sensitive marine environments.
PSV · OSV · Dredger · Workboat
Retrofit SCR Systems
Vessels retrofitting SCR systems to upgrade older engines to Tier III compliance. AUS 40 is the required reagent for all aftermarket marine SCR installations, and Bauly Chemicals can supply into existing port infrastructure or arrange IBC delivery to the vessel.
Retrofit · Upgrade · Tier III Conversion
Regulatory Compliance
IMO Tier III NOx Compliance
AUS 40 is a core enabling technology for IMO Tier III compliance. Marine SCR systems using ISO 18611-certified AUS 40 consistently achieve the Tier III NOx reduction targets across the global ECA network.
IMO Tier III — What It Requires
IMO Tier III requires an approximately 80% reduction in NOx emissions compared to Tier I limits — achievable only with exhaust aftertreatment technology such as marine SCR. AUS 40 in an SCR system enables up to 90% NOx reduction, providing headroom above the regulatory threshold. Tier III applies to vessels built after 1 January 2016 operating in designated ECAs.
ISO 18611-1:2014 — The Marine Standard
ISO 18611-1:2014 specifies the requirements for urea solutions used in marine SCR systems — covering composition, purity, packaging, storage, and handling. Bauly Chemicals AUS 40 is manufactured to meet ISO 18611 requirements, providing assurance of consistent catalyst-safe product quality for vessel operators.
Global Emission Control Areas (ECAs)
Vessels entering these ECAs must comply with IMO Tier III NOx limits and require AUS 40 for SCR operation. Australian-flagged vessels and international vessels calling at Australian ports with Tier III-fitted engines will benefit from Bauly Chemicals’ local supply network.
North Sea ECA
IMO Tier III applies from Jan 2021. Covers all North Sea shipping lanes including the English Channel.
Baltic Sea ECA
Tier III applies from Jan 2021. One of the world's busiest cargo shipping regions with strict enforcement.
North American ECA
Tier III applies to vessels built after 2016 within 200 nautical miles of US and Canadian coasts.
US Caribbean ECA
Encompasses Puerto Rico, US Virgin Islands and adjacent waters. Tier III enforced for qualifying vessels.
Storage & Handling
Storing AUS 40 Onboard & Onshore
Correct storage is essential to maintain AUS 40 quality within ISO 18611 specifications and protect SCR catalyst performance over time.
🌡️ Temperature: 0°C to 30°C
Store AUS 40 at 0–30°C in a cool, shaded location. Storage above 30°C accelerates urea degradation and shortens shelf life. Onboard tanks should have thermal management in tropical climates to prevent quality loss during extended voyages.
❄️ Freezes at -11°C
AUS 40 freezes at -11°C. Vessels operating in Arctic or sub-zero environments must use insulated or heated storage tanks. Frozen AUS 40 is not permanently damaged — it returns to full specification once thawed completely at room temperature, though repeated freeze-thaw cycles should be avoided.
🏗️ Approved Materials Only
Store in stainless steel (316L), HDPE, or other ISO 18611-approved container materials. Never store in carbon steel, copper, zinc-coated, or aluminium containers — these react with urea and introduce contaminants that can poison SCR catalysts and reduce emission control efficiency.
📋 Shelf Life: Up to 12 Months
When stored correctly at 0–30°C in sealed, approved containers, AUS 40 has a shelf life of up to 12 months from manufacture. Plan stock rotation and refilling schedules to ensure onboard AUS 40 remains in specification throughout the voyage plan. Safety Data Sheet available on request.
💧 Avoid Contamination
Keep AUS 40 sealed and away from contaminants. Even small amounts of AdBlue, oil, fuel, or cleaning products can introduce impurities that damage the SCR catalyst. Dedicated AUS 40 fill points, hoses, and handling equipment should be clearly labelled and used exclusively for AUS 40.
⚠️ Not Interchangeable with AdBlue
AUS 40 (40% urea / ISO 18611) and AdBlue AUS 32 (32.5% urea / ISO 22241) are not interchangeable. Adding the wrong product to a marine SCR system will compromise emission reduction performance and may damage the catalyst. Always verify the product is AUS 40 before filling marine SCR tanks.
Simple Process
How to Purchase AUS 40
From enquiry to IBC on your vessel or facility — a straightforward three-step process with fast response times.
Enquire & Quote
Submit your requirements via the online AUS 40 enquiry form, or email adblue@bauly.com.au. Include your volume, delivery port or address, and required timing. Bauly Chemicals will respond promptly with a competitive delivered price.
Confirm & Pay
Send your order confirmation by email. Payment is made on receipt of Bauly Chemicals' invoice. For regular supply arrangements, discuss credit account terms with our sales team.
IBC Delivery
Bauly Chemicals delivers AUS 40 in 1000L IBCs to your nominated location. Delivery available to Melbourne, Sydney, Brisbane, Adelaide, Perth, and Darwin (NT supplied from Brisbane or Adelaide).
Why Bauly Chemicals
Why Choose Bauly Chemicals for AUS 40?
01
ISO 18611 Certified
Every batch of Bauly Chemicals AUS 40 is manufactured to ISO 18611-1:2014 specifications — the international standard for marine urea solutions. Certificate of Analysis available on request to verify product quality for vessel operators and port authorities.
02
Australian Made
AUS 40 manufactured in Australia — supporting local maritime industry supply chains and ensuring consistent product quality and traceability from manufacture through to delivery. No reliance on international shipping lead times or import disruptions.
03
National Supply Network
Supply depots in Melbourne, Sydney, Brisbane, Adelaide, and Perth — with Darwin served from Brisbane or Adelaide. Bauly Chemicals covers all major Australian ports and can coordinate delivery directly to vessel, shipyard, or shore facility.
04
Marine Industry Focus
Dedicated marine AUS 40 supply team with deep understanding of vessel operational schedules, port turnarounds, and the logistical demands of maintaining SCR compliance during extended voyages and multi-port itineraries.
05
Fast Response & Delivery
Vessel arrival windows are tight. Bauly Chemicals provides prompt quote turnaround and reliable delivery coordination to ensure AUS 40 arrives when and where you need it, without disrupting vessel scheduling or port operations.
06
Also Supplying AdBlue
Need AdBlue for your road fleet or off-road equipment as well? Bauly Chemicals is also Australia’s trusted AdBlue supplier — ISO 22241 certified, in formats from 10L containers to bulk tanker. Consolidate your urea supply chain with a single trusted partner.
Frequently Asked Questions
AUS 40 — Common Questions
Answers to the most common questions from Australian vessel operators, port managers, and maritime industry buyers.
What is AUS 40?
AUS 40 (Aqueous Urea Solution 40%) is a clear, colourless liquid of 40% high-purity urea in deionised water. Used in marine SCR systems to reduce vessel NOx emissions by up to 90%, it is certified to ISO 18611-1:2014 and required for IMO Tier III compliance in Emission Control Areas (ECAs) worldwide.
What is the difference between AUS 40 and AdBlue?
AUS 40 contains 40% urea (ISO 18611) and is formulated for marine SCR systems. AdBlue (AUS 32) contains 32.5% urea (ISO 22241) and is designed for road and off-road diesel vehicles. The two products are not interchangeable — using the wrong concentration will damage SCR catalysts. Bauly Chemicals supplies both.
Is AUS 40 compliant with IMO Tier III NOx standards?
Yes. Bauly Chemicals AUS 40 is ISO 18611-certified and supports full IMO Tier III compliance when used in approved marine SCR systems. SCR systems using AUS 40 consistently achieve the required approximately 80% NOx reduction relative to Tier I limits, with headroom to spare at up to 90% reduction.
How do I purchase AUS 40 from Bauly Chemicals?
Submit an enquiry via the AUS 40 enquiry page or email adblue@bauly.com.au with your volume and delivery location. Bauly will respond promptly with a delivered price. AUS 40 is supplied in 1000L IBCs from depots in Melbourne, Sydney, Brisbane, Adelaide, and Perth.
Which vessels and engines is AUS 40 suitable for?
AUS 40 is suitable for all marine SCR-equipped vessels including cargo ships, tankers, container vessels, bulk carriers, ferries, cruise ships, offshore vessels, and workboats. Compatible with main propulsion engines, auxiliary generators, marine boilers, and hybrid propulsion systems — both new builds and retrofitted vessels.
What temperature should AUS 40 be stored at?
Store AUS 40 at 0–30°C in sealed, approved containers (stainless steel, HDPE). It freezes at -11°C — vessels in cold climates need heated storage. Storage above 30°C reduces shelf life. When stored correctly, shelf life is up to 12 months. Avoid contamination from other fluids — use dedicated AUS 40 handling equipment at all times.
About AUS 40 Supply in Australia
AUS 40 Marine Urea Solution — Australian Supplier
AUS 40 and the Australian Maritime Industry
AUS 40 (Aqueous Urea Solution 40%) is rapidly becoming an essential consumable for the Australian maritime sector. As global and Australian-flagged vessels face tightening IMO NOx emission standards, and as international ports and Emission Control Areas increasingly enforce Tier III compliance requirements, demand for reliable AUS 40 supply at Australian ports has grown significantly.
Bauly Chemicals is a dedicated AUS 40 supplier to the Australian maritime industry, supplying ISO 18611-certified product from warehouses in Melbourne, Sydney, Brisbane, Adelaide, and Perth — covering the five major commercial ports on the Australian coastline. Darwin is served via efficient freight from Brisbane or Adelaide, ensuring AUS 40 is accessible across Australia’s vast northern maritime zone.
Unlike AdBlue, which is widely available at service stations and automotive suppliers, AUS 40 is a specialised marine product that requires a supplier with maritime logistics capability and a deep understanding of vessel operational schedules. Bauly Chemicals combines product quality with supply chain reliability — delivering 1000L IBCs to vessel berths, port terminals, and marine facilities on schedules that work within the constraints of shipping operations.
ISO 18611 Quality Assurance for Marine SCR
The quality of AUS 40 is not merely a regulatory formality — catalyst-grade purity is operationally critical. Marine SCR catalysts represent a major capital investment, and contaminated or sub-specification AUS 40 can cause catalyst poisoning, reduced NOx conversion efficiency, and costly catalyst replacement. Bauly Chemicals AUS 40 is manufactured to ISO 18611-1:2014 specifications, with low levels of chlorides, sulphates, aldehydes, phosphates, and trace metals that could compromise catalyst performance.
The 40% urea concentration in AUS 40 is specifically calibrated for the higher operating temperatures and flow dynamics of marine diesel engine exhaust compared to road vehicle exhaust. This makes AUS 40 more effective in marine SCR applications than AdBlue (AUS 32), and means the two products must never be substituted for each other.
For Australian vessel operators planning voyages into North Sea, Baltic Sea, or North American ECAs, sourcing compliant AUS 40 before departure from an Australian port is a practical and cost-effective strategy. Bauly Chemicals can supply sufficient IBC quantities for the voyage plan, ensuring continuous IMO Tier III compliance throughout international operations. Contact our team to discuss supply arrangements for upcoming voyage schedules.
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Ready to Order AUS 40?
ISO 18611-certified, Australian-made AUS 40 supplied in 1000L IBCs to all major Australian ports and marine facilities. IMO Tier III compliant. Fast response, reliable delivery.
ENQUIRE NOW
ADBLUE@BAULY.COM.AU
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