# Marine Urea Knowledge Hub: PROTICKS AUS 40 Blog

Technical guides on AUS 40 marine urea, IMO Tier III & MARPOL Annex VI compliance, marine SCR systems, urea dosing, storage and Indian port supply, written by the PROTICKS Technical Team for vessel operators, superintendents and marine procurement.

## Guides

- **[What Is AUS 40? The Complete Marine Urea Guide](https://aus40.in/what-is-aus-40-marine-urea.html)**: Definition, chemistry, ISO 18611 & IS 17661 standards, packaging formats and sourcing in India. (Pillar guide, 2026-07-03)
- **[IMO Tier III & MARPOL Annex VI, Explained](https://aus40.in/imo-tier-3-marpol-annex-vi-nox-compliance.html)**: NOx limits by tier and engine speed, Emission Control Areas, applicability dates and enforcement. (Regulatory, 2026-07-03)
- **[How Marine SCR Systems Work & Urea Dosing](https://aus40.in/how-marine-scr-systems-work-urea-dosing.html)**: System architecture, catalyst chemistry, closed-loop dosing, consumption estimation, ammonia slip. (Technical, 2026-07-03)
- **[AUS 40 Storage, Handling & Shelf Life](https://aus40.in/aus-40-storage-handling-shelf-life.html)**: Temperature windows, crystallisation, compatible materials, contamination control, bunkering discipline. (Operational, 2026-07-03)
- **[AUS 32 vs AUS 40: Why AdBlue Can't Run Marine SCR](https://aus40.in/difference-between-aus32-and-aus40.html)**: Concentration, standards and engine scaling risk. (Comparison, 2026-06-18)
- **[AUS 40 Supply at Indian Ports](https://aus40.in/marine-urea-supply-ports-india.html)**: Port-side delivery at Mundra, Kandla, Pipavav, Dahej, Hazira, JNPT, Chennai, Vizag and more. (Supply network, 2026-06-18)

## About PROTICKS

PROTICKS manufactures ISO 18611 & IS 17661 (Part 1):2022 certified AUS 40 Marine Urea in Jamnagar, Gujarat, India, with port-side delivery across India.

- Quote requests: https://aus40.in/#contact
- Email: info@proticks.com · Phone: +91-74909-17799