• General

  Foreign Matter identification

  Posted by Lucylu747 on August 6, 2018 at 11:40 am

  Hi There, we have an issue in our production facility in that when we make certain products with no viscosity (such as some toners or room sprays) the products develop a sediment of small particles over time that float around at the base of the product.  The bulk is filtered with a 10 micron filter at production so it is not contamination from a raw material, but rather a particle that is developing over time.  It appears as small grey or black particles.  They also do not occur consistently and some batches will develop them and some will not.  They occur at room temperature after anywhere from 3-6 months.  Does anyone have any idea what they could be - does a particular ingredient in this formulation stand out as the cause?  We suspected metal ions and increased the chelating agent in the product but it didn’t help.  Alternatively does anyone know of a laboratory we can send a sample to that could possibly identify this foreign particle?  This is the formulation of a toner that is sometime affected.

  RAW MATERIAL	%
  Aqua	84.01
  Hamamelis Virginiana Water	5
  Rosa Centifolia Flower Water	5
  Propylene Glycol, Methylparaben, Propylparaben, Diazolidinyl Urea	1
  Propylene Glycol	1
  Glycereth-26	1
  Disodium EDTA	0.8
  Polysorbate-80	0.7
  PEG-40 Hydrogenated Castor Oil	0.5
  Parfum	0.4
  Benzophenone-4	0.2
  Allantoin	0.1
  Camellia Sinensis Leaf Extract, Bambusa Vulgaris Shoot Extract, Propylene Glycol	0.1
  Cetrimonium Chloride, Isopropyl Alcohol	0.05
  Citric Acid	0.05
  Sodium Hydroxide	0.05
  CI 42090	0.015
  CI 19140	0.009
  CI 17200	0.005
  Hydrolyzed Silk	0.01
  Bisabolol	0.005
  	100.00

  Sibech replied 6 years, 7 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Gunther

  Member

  August 6, 2018 at 8:10 pm

  What are the CIs?

  Please try without the plant extracts, or try adding some antioxidant like BHT to see if it works.
  You may need to wait several months to get the answer, so try to make as many different test batches as you can.

• 

  Lucylu747

  Member

  August 8, 2018 at 7:01 am

  Hi Gunther.  The CIs are colour pigments.

• 

  Sibech

  Member

  August 8, 2018 at 5:42 pm

  CI 42090 - Brilliant Blue FCF
  CI 19140 - Tartrazine yellow
  CI 17200 - Acid Red 33

  All of which are water-soluble dyes, not pigments.
  Does the colour of the product change during/after precipitation

  Seeing as you have to wait for several months you can add antioxidants as @Gunther suggested and do a knock-out (removing one ingredient) with all possible ingredients (except water of course)?

Log In to Reply