Even I who is mathematically challenged understood it.
thank you.
Sue.M
In a message dated 12/12/2008 11:29:55 A.M. Eastern Standard Time,
Kevin@kylabs.com writes:
 
 
 
Julie,
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.beilisdevelopmewww.be
--- In _CosmeticLab@CosmeticLab@Cos_ (mailto: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@CosmeticLab@Cos_ (mailto: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@CosmeticLab@Cos_ (mailto:CosmeticLab@yahoogroups.com)  
 
> [mailto:_CosmeticLab@CosmeticLab@Cos_ (mailto:CosmeticLab@yahoogroups.com) 
]  On
> > Behalf Of Julie
> > Sent: Wednesday, 10 December 2008  11:57 PM
> > To: _CosmeticLab@CosmeticLab@Cos_ (mailto: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]
>  >
>
 
**************Make your life easier with all your friends, email, and 
favorite sites in one place.  Try it now. 
(http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolcom00000010)
[Non-text portions of this message have been removed]
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/CosmeticLab/
<*> Your email settings:
    Individual Email | Traditional
<*> To change settings online go to:
    http://groups.yahoo.com/group/CosmeticLab/join
    (Yahoo! ID required)
<*> To change settings via email:
    mailto:CosmeticLab-digest@yahoogroups.com 
    mailto:CosmeticLab-fullfeatured@yahoogroups.com
<*> To unsubscribe from this group, send an email to:
    CosmeticLab-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/
