Wednesday, October 20, 2010
Preservatives: Imidiazolidinyl and diazolidinyl urea
It's a good anti-bacterial preservative that isn't great with fungus, so it is generally combined with other preservatives that fight fungus better, like the parabens. In fact, using imidiazolidinyl urea with parabens potentiates or increases the effect of both preservatives! With a pH of 4 to 9, it's appropriate for pretty much any product we make, except for completely anhydrous products as it isn't soluble in oils. It's not heat stable, so it must be added to the cool down phase of our products.
Imidiazolidinyl urea is approved at up to 0.6% in the EU and 0.3% in Japan.
For a PDF on the toxicity of imidiazolidinyl urea, please click here.
Both ureas are considered low formaldehyde releasers. Diazolidinyl urea can be found in Liquid Germall Plus and Germaben II.