Small amounts of 1,4-dioxane, a by-product of ethoxylation, may be found in the PEG Castor Oil and PEG Hydrogenated Castor Oil ingredients. The potential presence of this material is well known and can be controlled through purification steps to remove it from the ingredients before blending into cosmetic formulations.

Link to more information about what the Food and Drug Administration (FDA) is doing to assure that cosmetics do not contain unsafe levels of 1,4-dioxane.
http://www.fda.gov/Cosmetics/ProductandIngredientSafety/Pote...

FDA: Link to Code of Federal Regulations for castor oil and PEG castor oil
http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRS...
http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRS...

PEG Castor Oils and PEG Hydrogenated Castor Oils may be used in Europe according to the general provisions of the Cosmetics Directive of the European Union.
Link to the EU Cosmetics Directive: http://ec.europa.eu/consumers/sectors/cosmetics/documents/di...

PEG Castor Oils and PEG Hydrogenated Castor Oils are predominantly glyceryl triricinoleyl polyethylene glycols and tri-12-hydroxylstearyl polyethylene glycols, respectively. These castor oil-derived ingredients include various chain lengths, depending on the quantity of ethylene oxide used in synthesis. The average number of units of ethylene oxide is indicated by the number in the name of the ingredient.