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Teach Soap • View topic - Lotion batch size?

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 Post subject: Lotion batch size?
PostPosted: Mon Jul 30, 2012 12:26 am 

Joined: Sun Feb 27, 2011 10:42 pm
Posts: 454
Is there a minimum size for a lotion batch?

I know with soap, a batch smaller than a pound is likely to be problematic.

I was just wondering if I want to make a one-bottle batch, say three or four ounces, is that going to be a problem? (And yes, I have a scale that weighs hundredths of grams (.01), so accuracy won't be a problem.)

Thanks.

Anita


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 Post subject: Re: Lotion batch size?
PostPosted: Mon Jul 30, 2012 3:56 am 

Joined: Sat Dec 31, 2011 10:23 am
Posts: 1315

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Carrie
Wife to my Best Friend and Homeschool mom to 7 beautiful gifts


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 Post subject: Re: Lotion batch size?
PostPosted: Mon Jul 30, 2012 8:12 am 

Joined: Wed Dec 14, 2011 2:14 pm
Posts: 782
Even with a 0.01 scale, I find it really not a good idea to try to prepare really tiny test batches. 3 ounces would be 90 grams; an ingredient used at 0.2% will weigh 0.18g - even though the scale can measure it, if it is a liquid ingredient you need to add it directly to the whole, because weighing it separately would be impossible, most would get left in the weighing vessel. It's too easy to make a tiny slip and add a LOT more than wanted.

I do work with 100g samples quite often but only when I am checking basics, such as how much KOH I would need to neutralize an Ultrez-20 solution, for instance. When it comes to doing test batches of creams I generally find that 0.5Kg is about the smallest convenient size.


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