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These days you can hear almost on daily basis that every mixture change in composition demands new UFI.

This general truth is simply not true.

While it’s true that UFI has narrowed some of the composition ranges of substances used in formulation that does not mean every composition change needs new UFI.

There are small changes allowed enabling you to keep the old UFI (avoiding additional unnecessary costs). Small changes refer to:

  1. For substances that are classified with the following H sentences: 

H318, H314, H314.1a, H314.1b, H314.1c, H300.1, H300.2 H301, H302, H310.1, H310.2, H311, H312, H330.1, H330.2, H331, H332, H370, H371, H372, H373tabela1

  1. For other substances (classified with other H sentences or without H sentences):tabela2

Why don’t we look now at example that will put things into perspective?

Let’s say there’s a 20% substance with H319 in your mixture. When you look in Table 2 above you can see that maximum width range is 10 % units.

What that tells you is that you can use the same UFI if you have 15 % - 25 % of this substance in your mixture.  You can play and test formulation within that range and you can still use the same UFI.  

But if the concentration of this H319 substance changes more (if new conc. is less than 15 % or more than 25%) than you have to make new UFI/PCN.

Now this is just one example showing you how knowing details can save you time and money. UFI brings new opportunities (and threats). Make sure you use them to your advantage. And if you could use some help, we’re here to assist you.

Information on this blog is prepared with utmost care, but it is not about (chemical) consulting, and the provider does not assume any responsibility or liability for the correctness, accuracy and up-to-dateness of published content. If you need advice for a specific case, you can write to us at
UFI / PCN | October 9, 2019

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