During the last decade, demand for biobased hydraulic fluids has increased, especially for applications in mobile equipment and in close-to-water stationary installations like movable bridges. Motivation for the change comes both from users being more conscious about environmental risks and from government policies to create new markets for agricultural products.
One of the major obstacles in this market conversion is the sensitivity of biobased ester fluids or biodegradable fluids (bio-oils) to contamination with traditional mineral hydraulic oils. Typical situations involve either incomplete flushing during conversion from mineral oil to bio-oil or lack of attention during maintenance and refilling. This has been motivation to analyze the contamination effects in more detail.
Tags: fatty acids, ester molecules, reaction products, market share, bio-based lubricants, contamination level, draining, flushing procedure, HETG, HEES, HLP46, HLPD, HVLP, zinc-free HLP, SAE 15W-40, ISO 15380, DIN 51381, foam generation, filter clogging
Source: Machinery Lubrication, 2011-12-29.