NYK Group Company Launches Japan's First Antioxidant for Marine Biodiesel Fuel

BioxiGuard Reduces Oxidation Degradation by About Half, Aiming for More Efficient Fuel Use

21 May 2025

Nippon Yuka Kogyo Co., Ltd. ("Nippon Yuka"), an NYK Group company specializing in chemical R&D as well as the manufacture and sale of chemical products, announced today the forthcoming release of BioxiGuard, the Japan's first* antioxidant specially developed for marine biodiesel fuel ("biofuel"). This new product will be available from August 10. (*Date set by Nippon Yuka at time of press release)

Facilitating Decarbonization of Maritime Industry
Biofuel is garnering increased attention in the maritime sector due to its production from a diverse range of raw materials, including grains and used cooking oil. This supports the transition toward lower-carbon and decarbonized vessel operations. However, compared with conventional petroleum-based fuels, biofuel contains a higher proportion of unsaturated fatty acids, making it more susceptible to oxidative degradation. Once oxidized, the biofuel can produce acidic substances and sludge, adversely affecting vessel fuel efficiency by reducing the fuel's calorific value.

Key Features of BioxiGuard
Developed by Nippon Yuka based on property analyses of the biofuel used in NYK-operated vessels, BioxiGuard is specifically formulated to enhance the oxidation stability of biodiesel. When added to biofuel, BioxiGuard slows the progression of oxidative degradation and helps deter issues such as metal corrosion, strainer blockage, and cleaning-system fouling often triggered by oxidized fuel.

According to laboratory tests conducted by Nippon Yuka researchers, the addition of BioxiGuard at a concentration of 1 part per 500 resulted in an approximate 50% reduction in the rate of biofuel degradation compared to untreated biofuel. This significant improvement underscores the potential for vessel operators to not only extend the useful life of biofuel on board but also maintain more stable and cost-effective vessel operations.


Experimental data.   Image by NYK Group.

Product Overview
Product name: BioxiGuard
Target fuel: Biodiesel fuel (FAME: Fatty Acid Methyl Ester)
Expected release date: August 10
Contact: Nippon Yuka Kogyo, Sales Department 1
Email: eigyou1@nipponyuka.com

In addition to offering antioxidant functions, Nippon Yuka is committed to further product development aimed at resolving broader challenges associated with biofuel utilization.

The company will continue to seek innovative solutions that contribute to the realization of a more sustainable future for the maritime industry.

NYK Group, press release