Lubricant Biodegradation: Differentiating your products for environmental concerns.

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There are many ways that lubricants enter the environment.

Although great effort is put into prevention, its standard practice to presume that some will enter the environment. The ability to biodegrade is a key consideration in product development; especially for sensitive environments than could see a significant impact from the introduction of potentially hazardous liquids. For customers in the energy and maritime industries, biodegradability testing is an important step to gaining market acceptance for both new and existing products. It also helps add value and distinguishes a product from the competition.

For biodegradation testing of solution-based (liquid) formulations OECD 301B and ISO 14593 are the most commonly requested methods in the U.S. and Europe.

Claims about a products’ biodegradability are challenging. It can be loosely applied as a description, yet depending on the market it can also be a strictly regulated performance parameter.

Readily and Ultimate Biodegradation Graph

Graph showing Ready and Ultimate Biodegradation of a control material. Biodegradation is measured in this case by Theoretical Oxygen Demand (%ThOD).

Readily Biodegradable – is seen in the shaded area within day 4. Its precise definition is the required biodegradation within a 10 day window in the 28 day maximum period.

Ultimate Biodegradability – the maximum attained degradation within the test period. Example shown in the graph at around 80%.

Before making a claim about a products performance consider:

  1. What type of Biodegradability is needed? Inherent, Readily or Ultimate Biodegradability?
  2. Is toxicity a concern?
  3. Does the customer have specific regulatory needs?

Ready and Ultimate Biodegradability are the most common measurements for biodegradability.  Readily Biodegradable is rate of biodegradation that occurs within a specified time frame. At a certain point, the rate of biodegradation will plateau and no more of the material will biodegrade. This is Ultimate Biodegradability. Both values are analyzed in ISO 14593 and in OECD 301B.

Toxicity testing for solutions based biodegradation is not a test for specific EPA regulated chemicals. Rather, it determines if components are introduced into the environment that will hinder or even prevent plant growth. Customers use the OECD Guideline 208 Terrestrial Plant Growth Test method in conjunction with the OECD 301B Test Series.

Solution Based Biodegradation is covered  either OECD 301B or ISO 14593 methods will provide a satisfactory assessment. The two methods have been harmonized and represent very similar test methods. Although there may be some preference depending on the needs of a customer in a given region, a customer’s familiarity with one of the methods, or if there are specific regulatory requirements.

Have questions? Just give us call and we can help guide the process to select the appropriate test. Sources/Links:

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