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Thu Dec 09, 2010 7:14 am  |
| I'm making my C serum and I have a hard time filling my dropper with the correct amount (0.6 ml/cc) of polysorbate 80. I get air in the dropper and it's just a little tricky. And I don't really have a .6 mark on it, anyway. I think counting drops would be an easier way to be more accurate. How many? |
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Thu Dec 09, 2010 7:21 am |
| Flavia wrote: |
| I'm making my C serum and I have a hard time filling my dropper with the correct amount (0.6 ml/cc) of polysorbate 80. I get air in the dropper and it's just a little tricky. And I don't really have a .6 mark on it, anyway. I think counting drops would be an easier way to be more accurate. How many? |
1 drop=1cc/1mm 6 drops.  |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Thu Dec 09, 2010 7:36 am |
| This recipe calls for .6 cc, not 6 cc. You're saying 6 cc = 6 drops? Not .6? Sorry I'm so mathematically challenged! |
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Thu Dec 09, 2010 7:44 am |
| Flavia wrote: |
| This recipe calls for .6 cc, not 6 cc. You're saying 6 cc = 6 drops? Not .6? Sorry I'm so mathematically challenged! |
It's somewhat variable as we don't have sophisticated lab equipment! 1 drop is 1 cc, just aim for a very small drop and you should be just fine. Sorry I missed the . the first time! |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Thu Dec 09, 2010 11:33 am |
| 1 drop cannot be 1cc, 1cc is lots and lots of drops |
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Thu Dec 09, 2010 11:52 am |
You're talking about the drip chambers in IV sets, and, yes, standard IV sets deliver 15 gtts/ml; however, there are also IV sets that deliver 60 gtts/ml and those are frequently/typically used in peds settings (makes it harder to accidentally run too much fluid into the kids, although that's a lot less of an issue now that the controllers and pumps are so common). It will always say somewhere on the packaging for the IV tubing set how many gtts/ml it delivers.
gtts=drops so it depends on the size of your drop I have measeued a drop from a vit. E capsule into an insulin needle and got 1cc, if I were to measure a drop from that same syringe coming out of the needle it's a much smaller drop! |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Thu Dec 09, 2010 12:02 pm |
You are right daler, my bad! LOL I am the one who origionally posted this information!
Bellezza wrote:
3. How to measure 1 cc powder active?
Someone posted this:
1ml or 1cc = 15-16 minums
1 0.06 ml = 1 minums = 1 gtt (gtt stands for drops). Of course this is for liquids and you're using powder.
Try this:www.allnurses.com
Bellezza,
I did post that as somebody said they had no idea what on earth gtts. stood for and I did a quick search on google and came up
with allnurses.com and an answer.
DM |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Thu Dec 09, 2010 12:05 pm |
no problem DarkMoon; I use syringes ( without needles) for my DIY potions and I could tell that 1 cc would be many drops 
I just used the syringe ( without needle) to figure out how many drops, so here it is:
.6ml= 15 drops ( of water, it may vary with other liquids as well as size of the drop) |
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Thu Dec 09, 2010 12:22 pm |
| daler wrote: |
no problem DarkMoon; I use syringes ( without needles) for my DIY potions and I could tell that 1 cc would be many drops
I just used the syringe ( without needle) to figure out how many drops, so here it is:
.6ml= 15 drops ( of water, it may vary with other liquids) |
I don't know where my brain went, I have syringes with needles left from both insulin and B-12 injections and each will have a different size drop because of the needle size!  |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Thu Dec 09, 2010 3:14 pm |
| Just to clarify, I'm using the little plastic dropper that came with my LotionCrafter stuff. As mentioned in my original post, I'm using polysorbate 80. When I make up the serum, there is a bit of foam at the top of the bottle which I have to shake up. That defeats the purpose of the emulsifier, I would guess. Is the foam the result of using too much p80 or not enough? So you think I should use about 15 drops? I know you tested using water and p80 is oily. |
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Thu Dec 09, 2010 3:44 pm |
well, in DIY, you have to do trial and error... why dont you try with 10 drops and see... also, is there any oil in your recipe? cause emulsifiers are used to mix oil in water to form an emulsion......
| Flavia wrote: |
| Just to clarify, I'm using the little plastic dropper that came with my LotionCrafter stuff. As mentioned in my original post, I'm using polysorbate 80. When I make up the serum, there is a bit of foam at the top of the bottle which I have to shake up. That defeats the purpose of the emulsifier, I would guess. Is the foam the result of using too much p80 or not enough? So you think I should use about 15 drops? I know you tested using water and p80 is oily. |
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Thu Dec 09, 2010 5:00 pm |
| Yes, I'm using vitamin e oil and glycerin. I'll experiment, but I just wasn't sure what caused the foam at the top of the bottle, so don't know whether to try more or less. |
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Thu Dec 09, 2010 7:54 pm |
I worked in a lab for 30 years and the rule of thumb was 20 drops= 1 ml
I just checked the internet and that is the recommended conversion.
0.6mL= 12 drops.
Personally, in the absence of any other way to measure, that is what I would use. |
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Fri Dec 10, 2010 8:13 am |
According to this it's almost (0.9....ml) equals 15 drops and just over 1 ml = 16 drops. |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Fri Dec 10, 2010 9:49 am |
IMO the guormetsleuth website is not a reliable site for chemistry information. I personally would choose another website.
A gooogle search for:
drop ml "rule of thumb"
yields these results and many others
http://www.austincc.edu/respinos/Dosage%20ModulesI-V.ppt
http://allairepharmaceuticals.com/pharmguide.htm
http://www.newton.dep.anl.gov/askasci/chem00/chem00578.htm
http://forum.onlineconversion.com/archive/index.php?t-618.html
In nearly all laboratories in the U.S., if a drop measurement were used the 20 drops/ml conversion rate would be applied. I worked for at least seven different companies for 35 years and if I were making solution this is the conversion that I would use. Everyone is free to choose there own conversion rate.
Using drops for measuring is not the most accurate method. For many things it is close enough which is why it is still used. Drops would never be used for any analytical method. When making a cosmetic product at home, using drops will be close enough as a slight variation one way or another is not critical to the performance of the solution or cream.
Another method for the at home chemical compounder would be to use a 1/8 teaspoon for 0.6 ml. 5 ml= 1 tsp 0.6ml= 0.12 tsp or 1/8 of a tsp. I don't even know if 1/8 tsp measuring spoons are available but that would work. |
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Fri Dec 10, 2010 10:09 am |
LotionCrafters sells all the following,
http://www.lotioncrafter.com/allproducts.php
.15cc Measuring Scoop
1.25cc Measuring Scoop
15ml Measuring Scoop
1cc Measuring Scoop
1cc Measuring Scoop
When you need to measure .5cc or 1cc accurately!
This scoop is just the ticket. It holds 1cc or 1ml (equivalent to about 1/5th of a teaspoon), but also has an inside line marked for .5cc or .5ml.
Capacity: 1cc
Material: Polystyrene
Length: 75mm (3") |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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Fri Dec 10, 2010 10:36 am |
| JonnyNJ wrote: |
In nearly all laboratories in the U.S., if a drop measurement were used the 20 drops/ml conversion rate would be applied. I worked for at least seven different companies for 35 years and if I were making solution this is the conversion that I would use. Everyone is free to choose there own conversion rate.
Using drops for measuring is not the most accurate method. For many things it is close enough which is why it is still used. Drops would never be used for any analytical method. When making a cosmetic product at home, using drops will be close enough as a slight variation one way or another is not critical to the performance of the solution or cream.
Another method for the at home chemical compounder would be to use a 1/8 teaspoon for 0.6 ml. 5 ml= 1 tsp 0.6ml= 0.12 tsp or 1/8 of a tsp. I don't even know if 1/8 tsp measuring spoons are available but that would work. |
From Pharmaceutical Calculations for the Pharmacy Technician:
Frequently the drop is used as a measurement for medicines; it does not represent a definite quantity, because drops of different liquids vary greatly. In an attempt to standardize the drop as a unit of volume, the United States Pharmacopoeia defines the official medicine dropper as being constricted at the delivery end to a round opening with an external diameter of about 3 mm. The dropper, when held vertically, delivers water in drops. The official dropper is calibrated to deliver approximately 20 drops of water per milliliter.
So 0.6 mL is 12 drops. 1/8 of a teaspoon is a very close approximation of 0.6 mL. |
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Born 1953; Blonde-Blue; Normal skin |
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Fri Dec 10, 2010 11:20 am |
Seems to depend on the country as well?
http://www.simetric.co.uk/si_medical.htm
15 to 16 drops ( gtts ) = 1 cc = 1ml
Note:- Spoon and drop conversions should be regarded as approximations due to the different surface tensions and specific gravity of various liquids. |
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