Renewable energy firm MASH Makes and research institute FVTR GmbH have successfully completed critical laboratory engine testing of an upgraded biofuel derived from Cashew Nut Shell Liquid (CNSL). The testing, conducted in Germany, utilized a marine-grade single-cylinder research engine to evaluate a blend of 20% upgraded CNSL and 80% Very Low Sulphur Fuel Oil (VLSFO). The results confirm that the proprietary upgrading process developed by MASH Makes has addressed the historical technical barriers associated with raw CNSL, positioning the fuel as a technically viable and stable “drop-in” alternative for the global maritime sector.

The primary challenge addressed by this development is the inherent instability of traditional CNSL-based fuels. While CNSL has long been identified as a promising feedstockFeedstock refers to the raw organic material used to produce biochar. This can include a wide range of materials, such as wood chips, agricultural residues, and animal manure. More, its chemical tendency to polymerize—a characteristic that makes it useful as a paint-thickening resin—has previously led to reliability issues in maritime applications. Shipowners have frequently reported injector fouling, residue buildup, and an inability to maintain consistent blends, which posed significant risks to engine integrity and operational safety during deep-sea voyages.

MASH Makes addressed these challenges through a proprietary thermochemical upgrading process that stabilizes the fuel and prevents polymerization. During the FVTR GmbH trials, the fuel demonstrated clean combustion and stable operation across all engine loads without requiring specialized tuning or fuel pressure adjustments. Technical analysis confirmed no signs of injector degradation, and the fuel behaved comparably to conventional petroleum-based marine fuels. This engineering solution ensures that the fuel can be integrated into existing vessel infrastructure without the need for costly retrofits or modifications to fossil-fuel delivery systems.

The outcomes of the testing indicate a significant milestone for maritime decarbonization and the biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More co-production model. Environmental performance remained within regulatory parameters, with nitrogen oxide (NOx) emissions staying below International Maritime Organization (IMO) Tier II limits and carbon monoxide levels remaining stable. Furthermore, the smoke opacity decreased at partial loads, suggesting high combustion efficiency. By proving that CNSL can be transformed into a reliable marine fuel, MASH Makes has cleared a technical path for a scalable, cost-effective energy source that supports the industry’s transition toward lower-carbon operations.