Delo® XLI Corrosion Inhibitor – Concentrate (Delo XLI) is a water-based, low toxicity, readily biodegradable, nitrite-free carboxylate inhibitor package. Based on patented Organic Additive Technology (OAT), Delo XLI provides long-life corrosion protection in aqueous solutions for all engine metals, including aluminum, iron, copper and solder alloys. Mixed with the appropriate amount of water, Delo XLI is recommended as a cooling water treatment. Delo XLI has been proven to provide effective protection for at least 32,000 hours in marine and stationary applications. It is compatible with glycol-based engine coolants.
Delo XLI can be used as an engine cooling water treatment, a flushing fluid, or a hot test fluid for new engine blocks. It is recommended for cooling water treatment operating below 100°C. For marine application the dosage may vary from 6.0–7.5% but a minimum of 5% volume of Delo XLI in water should be used. As an engine cooling water treatment, Delo XLI provides long-life corrosion protection. If Delo XLI is replenished regularly to compensate for leakage, the cooling water can be considered as fill for life. The use of soft water is preferred for dilution, though lab testing has shown that acceptable corrosion results are still obtained with water of 20°dH, containing not up to 500 ppm chlorides and 500 ppm sulphates.
GEC Alsthom Ruston
Liebherr MD 1-36-130 (DCA)
MAN Energy Solutions 2-stroke engines (operating with cooling water temperature below 100°C)
MAN Energy Solutions 4-stroke engines
MTU 2000 & 4000 series engines
Scania TI 2-98 0813 TB
Wärtsilä 32-9011 and ZBS0503
Delo XLI is based on low toxicity inhibitors and is readily biodegradable. The extended service life characteristic of this product reduces waste due to less frequent fluid disposal. The toxicological and environmental properties of Delo XLI were evaluated by an independent laboratory. The results are listed below: • LD50 >2000 mg/kg (Oral toxicity according to OECD Guideline No. 401) • LC50 >1000 mg/l (Fish toxicity according to OECD Guideline No. 203) • Biodegradability: 92% (18 days) (Test according to OECD Guideline No. 301E)
2. Corrosion Protection
Provides long-life protection against most forms of corrosion on the majority of metals including the aluminum heat transfer surfaces contained in modern engines.
3. Cavitation Protection
Offers cavitation protection without using nitrite or nitritebased supplemental coolant additives (SCAs).
4. Seal Compatibility
Has no adverse effect on rubber hoses and gasket materials as shown in testing a wide range of seal materials.
5. Heat Transfer Efficiency
The carboxylic acid inhibitor inhibitor forms a targeted mono-molecular protective layer on metal surfaces, thus providing efficient heat transfer.
Long life corrosion protection and low additive depletion often result in less maintenance and repair costs.