Green methanol, ethanol, and diesel-based hydrotreated vegetable oils are some of the renewable liquid fuels that show satisfactory performance in diesel engines. A notable advantage of these fuels is that they are renewable and do not require significant modifications in the existing engines for successful operation. Suitable fuel systems, especially their material compatibility, remain unresolved, and therefore, it is a weak link in their large-scale adaptation. Elastomer-based sealing O-rings lose their mechanical properties after a short exposure time to these fuels, adversely impacting their functionality. This research study evaluated the long-term material compatibility of different elastomer-based sealing materials by immersing the O-rings in these test fuels (hydrotreated vegetable oil, methanol, ethanol, and diesel) for different time intervals (i.e., up to 15 months). The material compatibility was assessed mainly by investigating these changes in various mechanical properties of these O-rings, namely tensile strength (ΔTs), elongation at break (ΔEb), Shore A hardness (ΔH), and mass (ΔM). The degradation of mechanical properties was studied and analyzed during the immersion interval from 0.9 to 15.2 months and compared with O-rings kept in a normal atmosphere. It was noted that individual fuels affect various mechanical properties significantly. In a short interval of 0.9 months (28 days), significant changes in the mechanical properties of the sealing O-rings were observed.

Faculty of Engineering Czech University of Life Sciences Prague Kamycka 129 Suchdol 165 00 Prague Czech Republic

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Lu C., Xie D.F., Zhao X.M., Qu X. The role of alternative fuel buses in the transition period of public transport electrification in Europe: A lifecycle perspective. Int. J. Sustain. Transport. 2023;17:626–638. doi: 10.1080/15568318.2022.2079445. DOI

Bi Z., Song L., Kleine R., De C., Keoleian G.A. Plug-in vs. wireless charging: Life cycle energy and greenhouse gas emissions for an electric bus systém. Appl. Energy. 2015;146:11–19. doi: 10.1016/j.apenergy.2015.02.031. DOI

Szeto W., Leung D.Y.C. Is hydrotreated vegetable oil a superior substitute for fossil diesel? A comprehensive review on physicochemical properties, engine performance and emissions. Fuel. 2022;327:125065. doi: 10.1016/j.fuel.2022.125065. DOI

Cedik J., Pexa M., Holubek M., Mrazek J., Valera H., Agarwal A.K. Operational Parameters of a Diesel Engine Running on Diesel–Rapeseed Oil–Methanol–Iso-Butanol Blends. Energies. 2021;14:6173. doi: 10.3390/en14196173. DOI

Valera H., Agarwal A.K. Alternative Fuels and Their Utilization Strategies in Internal Combustion Engines. Springer; Singapore: 2020. Future automotive powertrains for India: Methanol versus electric vehicles; pp. 89–123.

Muller M., Sleger V., Cedik J., Pexa M. Research on the Material Compatibility of Elastomer Sealing O-Rings. Polymers. 2022;14:3323. doi: 10.3390/polym14163323. PubMed DOI PMC

Alvino A., Borsini S. High-Performance Elastomeric Materials Reinforced by Nano-Carbons. Elsevier; Amsterdam, The Netherlands: 2020. Testing of Rubber Nanocomposites for Aerospace, Automotive and Oil and Gas Applications; pp. 177–191.

Chea S., Luengchavanon M., Anancharoenwong E., Techato K.A., Jutidamrongphan W., Chaiprapat S., Niyomwas S., Marthosa S. Development of an O-Ring from NR/EPDM Filled Silica/CB Hybrid Filler for Use in a Solid Oxide Fuel Cell Testing System. Polym. Test. 2020;88:106568. doi: 10.1016/j.polymertesting.2020.106568. DOI

Haseeb A., Jun T.S., Fazal M.A., Masjuki H.H. Degradation of Physical Properties of Different Elastomers after Exposure to Palm Biodiesel. Energy. 2011;36:1814–1819. doi: 10.1016/j.energy.2010.12.023. DOI

Bafna S. Factors Influencing Hardness and Compression Set Measurements on O-Rings. Polym. Plast. Technol. Eng. 2013;52:1069–1073. doi: 10.1080/03602559.2013.779710. DOI

Trakarnpruk W., Porntangjitlikit S. Palm oil biodiesel synthesized with potassium loaded calcined hydrotalcite and effect of biodiesel blend on elastomer properties. Renew. Energy. 2008;33:1558–1563. doi: 10.1016/j.renene.2007.08.003. DOI

Linhares F.N., Correa H.L., Khalil C.N., Leite M.C., Furtado C.R.G. Study of the compatibility of nitrile rubber with Brazilian biodiesel. Energy. 2013;49:102–106. doi: 10.1016/j.energy.2012.10.040. DOI

Alves S.M., Mello V.S., Medeiros J.S. Palm and soybean biodiesel compatibility with fuel system elastomers. Tribol. Int. 2013;65:74–80. doi: 10.1016/j.triboint.2013.03.026. DOI

Thomas E.W., Fuller R.E., Terauchi K. Fluoroelastomer compatibility with biodiesel fuels. J. Fuels Lubr. 2007;116:947–956.

Zhang X., Li L., Wu Z., Hu Z., Zhou Y. Material Compatibilities of Biodiesels with Elastomers, Metals and Plastics in a Diesel Engine. SAE International; Warrendale, PA, USA: 2009. SAE Technical Paper 2009-01-2799. DOI

Crouse M. The effects of non-petroleum based fuels on thermoset elastomers. SAE Trans. 2002;111:364–372. doi: 10.4271/2002-01-0634. DOI

Frame E., McCormick R.L. Elastomer Compatibility Testing of Renewable Diesel Fuels. National Renewable Energy Laboratory; Golden, CO, USA: 2005. Technical report NREL/TP-540-38834.

Munoz M., Moreno F., Monne C., Morea J., Terradillos J. Biodiesel improves lubricity of new low sulphur diesel fuels. Renew. Energy. 2011;36:2918–2924. doi: 10.1016/j.renene.2011.04.007. DOI

Chai A.B., Andriyana A., Verron E., Johan M.R. Mechanical characteristics of swollen elastomers under cyclic loading. Mater. Des. 2013;44:566–572. doi: 10.1016/j.matdes.2012.08.027. DOI

Chandran D., Ng H.K., Lau H.L.N., Gan S., Choo Y.M. Investigation of the effects of palm biodiesel dissolved oxygen and conductivity on metal corrosion and elastomer degradation under novel immersion method. Appl. Therm. Eng. 2016;104:294–308. doi: 10.1016/j.applthermaleng.2016.05.044. DOI

Kumar D., Valera H., Agarwal A.K. Methanol: A Sustainable Transport Fuel for CI Engines. Springer; Singapore: 2021. Technology Options for Methanol Utilization in Large Bore Diesel Engines of Railroad Sector; pp. 89–123.

Automotive Fuels. Diesel. Requirements and Test Methods. European Committee for Standardization; Brussels, Belgium: 2022.

Lv X., Yang J., Zhang W., Huang Z. Effect of cetane number improver on heat release rate and emissions of high speed diesel engine fueled with ethanol–diesel blend fuel. Fuel. 2004;83:2013–2020. doi: 10.1016/j.fuel.2004.05.003. DOI

Bohl T., Smallbone A., Tian G., Roskilly A.P. Particulate number and NO trade-off comparisons between HVO and mineral diesel in HD applications. Fuel. 2018;215:90–101. doi: 10.1016/j.fuel.2017.11.023. DOI

Automotive Fuels—Paraffinic Diesel Fuel from Synthesis or Hydrogenation—Requirements and Test Methods. European Committee for Standardization; Brussels, Belgium: 2016.

Standard Test Method for Rubber Property—Effect of Liquids. ASTM International; West Conshohocken, PA, USA: 2021.

Testing of Solid and Liquid Fuels—Determination of Heat of Combustion in the Calorimeter Pressure Vessel and Calorific Value Calculation—Part 1: General Information, Basic Equipment and Method. Czechoslovak Army 216/41; Hradec Králové, Czech Republic: 2014.

Testing of Solid and Liquid Fuels—Determination of Heat of Combustion in a Pressure Vessel Calorimeter and Calculation of Calorific Value—Part 2: Isoperibolic Calorimeter or Static Jacket Calorimeter Method. Czechoslovak Army 216/41; Hradec Králové, Czech Republic: 2015.

Bright Steel Products—Technical Delivery Conditions—Part 1: General. European Committee for Standardization; Brussels, Belgium: 2018.

Dimensions, Their Limit Deviations and Shape and Position Tolerances of Polished Steel Products. European Committee for Standardization; Brussels, Belgium: 2003.

Bessee G.B., Fey J.P. Compatibility of elastomers and metals in biodiesel fuel blends. SAE Trans. 1997;106:650–661.

Ch’ng S.Y., Andriyana A., Verron E., Kahbasi O., Ahmad R. Development of a novel experimental device to investigate swelling of elastomers in biodiesel undergoing multiaxial large deformation. Exp. Mech. 2013;53:1323–1332. doi: 10.1007/s11340-013-9737-2. DOI

Metallic Materials—Verification of Static Uniaxial Testing Machines—Part 1: Tensile and Compression Testing Machines—Verification and Calibration of the Force Measuring System. European Committee for Standardization; Brussels, Belgium: 2016.

Rubber, Vulcanized or Thermoplastic Elastomer—Determination of Tensile Properties. Czechoslovak Army 216/41; Hradec Králové, Czech Republic: 2016.

Plastics and Ebonite—Determination of Hardness by Indenting the Tip of a Hardness Tester (Shore Hardness) Czechoslovak Army 216/41; Hradec Králové, Czech Republic: 2003.