A report from the Renewable Energy Group lists the characteristics of 36 different biodiesel feedstocks and an analysis of important fuel properties in the corresponding processed biodiesel products. The report described the project as "unique because it encompassed an extensive range of feedstocks, and all feedstocks were pretreated, esterified, and transesterified using the same procedures/conditions, allowing for uniform comparisons of critical fuel properties". At total of 36 feedstocks were evaluated, and 34 of these were processed into biodiesels for fuel analysis. The feedstock sources were from a wide variety of plant, animal, and waste materials. Feedstock characterization included moisture content, free fatty acid content, oxidation stability and insoluble impurities. Fuel analysis included density, flash point, free fatty acid composition, oxidation stability, and cold-flow properties. Some findings from the report (as summarized in the bioenergysite website) are: (1) "coconut and babassu oil(s) are types of feedstocks that are high in saturated fatty acids making them particularly stable towards oxidation", (2) "moisture was a minor component found in all the feedstocks tested, but it can react with the catalyst during transesterification, which can lead to soap formation and emulsions", (3) "Five biodiesel samples from castor, Lesquerella, neem, tung and poultry fat did not pass the ASTM Cold Soak Filtration specification of 360 seconds". The full report can be accessed from the Renewable Energy Group website (URL above)..