An advantage of working with percentages is that you can make any size
batch of product easily by multiplying the batch size by the percent
of material used. As Bruce explained you are using 4% of a 2% solution
if you convert this to the proper decimal notation 0.04 (which is 4
one hundredths)and 0.02 (which is 2 one hundredths)this multiplication
equals 0.08. This is the amount by weight of the dry powder you would
use in your product. Conversely, if you wanted to my your own 2%
solution of Na Hyaluronate, then you would use 2 part of the powder
per 98 parts of water to give you 2%.
Now let's put this to practical use. Let's say you want to make 8 oz
of a 2% solution. You would multiply 8 oz by 2% which is multiplying
8*0.02=0.16 oz. Subtracting 0.16 from the original 8 oz you want to
make then you need 7.84 oz water. Now this shows a difficulty of
working in pounds and ounces. Let's say that instead of 8 oz you want
to make 250 grams of solution. This is approximately 8 oz. Multiply 2%
times 250 and you find that you need 5.0 grams of your Na Hyaluronate
powder in 245.0 grams of water. Certainly you will need a balance
capable of weighing grams. Now let's say that you wanted to make a
batch that was 100 grams (slightly less than 4 oz), you would multiply
0.2*100=2 Gee, this looks like 2% is 2 grams per 100 grams of product.
Again, remember that the symbol % means per 100. Therefore 2% is 2
(units) per 100 (units) of something. Hopefully, this provides you the
insight to become a redhead like me instead of staying a blonde.
Kevin Young
Laboratory Manager
Beilis Development
www.beilisdevelopment.com
--- In CosmeticLab@yahoogroups.com, "Julie" <kjj@...> wrote:
>
> Hi Bruce,
> Thanks for the answer. Now would you mind teaching me the math? (Yes,
> I am a blonde!)
> Julie
>
> --- In CosmeticLab@yahoogroups.com, Bruce Heath <baheath@> wrote:
> >
> > Hi Julie,
> >
> > Ok ..... so you are starting with a 2% (w/w) soln and using 4% of
> that.
> >
> > You will use 0.08% of the powder (assuming the powder is 100%
> hyaluronic
> > acid)
> >
> > or 0.8g/lt of acid based on the finished product.
> >
> > Regards,
> >
> > Bruce
> >
> >
> >
> > -----Original Message-----
> > From: CosmeticLab@yahoogroups.com
> [mailto:CosmeticLab@yahoogroups.com] On
> > Behalf Of Julie
> > Sent: Wednesday, 10 December 2008 11:57 PM
> > To: CosmeticLab@yahoogroups.com
> > Subject: [CosmeticLab] Help figuring solution %
> >
> >
> >
> > Hi,
> > Hope someone can help me figure this out! I've been using a
> premixed 2%
> > hyaluronic liquid at 4% in a formula. Now if I were to buy the
> powder &
> > want to just add that in to my water phase how do I figure it?
> Thanks.
> > Julie
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
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