Assay/ concentration

AanchalAanchal Member
edited August 8 in Formulating
Are assay and concentration same in effect while formulating? 

While formulating detergents or any other product, if commercially available raw material is at a lower concentration than needed, can we use it in larger quantity.

For eg., SLES is needed at 69% assay . I am getting it in 28% concentration. Can I use the 28% SLES in increased ratio? 


Comments

  • PerryPerry Administrator, Professional Chemist
    If you need 69% SLES in your formula and the raw material is supplied as 28% you won't be able to do it. You would have to evaporate off some of the water to increase the concentration of SLES.

    For every 100 grams of a 28% solution you put in, you are only putting in 28 grams of SLES.
  • The lower the assay the more you need to supply the ingredient you are after.

    The maths is simple: What you want, divided by what you have, multiplied by 100.

    So, 69 %/28% x 100 = 246.4% which clearly will not work.
  • AanchalAanchal Member
    Perry said:
    If you need 69% SLES in your formula and the raw material is supplied as 28% you won't be able to do it. You would have to evaporate off some of the water to increase the concentration of SLES.

    For every 100 grams of a 28% solution you put in, you are only putting in 28 grams of SLES.


    Thanks Perry. 

    I understand that evaporating is a sure shot solution.

    Can adding additional amount help too?

    My formula states 10 % of 69% SLES (it is a water based formula) 

    So, 10*69/28 =24.6 % _ That is, 28% SLES in the amount 24.6 % 

    Here, I am adding additional water with the 28% SLES so I shall deduct water in the formula proportionately. 

    Can this be done? 


  • PerryPerry Administrator, Professional Chemist
    If you are adding 10% of a 69% SLES solution,  that means you are adding 6.9 grams in 100 grams.  So, to get 6.9 you would need 24.6% of the 28% solution. Then subtract the excess volume from the water.

    Yes, that would work.
  • AanchalAanchal Member
    Thanks again Perry .
  • AanchalAanchal Member
    Herbnerd said:
    The lower the assay the more you need to supply the ingredient you are after.

    The maths is simple: What you want, divided by what you have, multiplied by 100.

    So, 69 %/28% x 100 = 246.4% which clearly will not work.
    Thanks Herbnerd. 
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