![]() It is TTB Table No.6 that is used for alcohol dilution calculations. For example, a blend that is 50 % ABV at 60✯ is 100 Proof. The Proof is simply twice the % ABV at 60✯. These Tables can be freely downloaded from Īll the TTB Tables use Proof as the measure of strength. The ingenuity of these tables is reflected in the fact that they are still in use today, 100 years after their original issue. To facilitate alcohol gauging, blending and proofing calculations in the days before electronic calculators and computer spreadsheets the TTB issued a set of 7 Tables which allowed very accurate alcohol dilution calculations to be performed with a minimum of mathematics. In the USA the manufacture and trade of alcoholic beverages are regulated by the Alcohol and Tobacco Tax and Trade Bureau - usually abbreviated as TTB. The TTB Table No.6 Method for alcohol dilution & proofing calculations As you will see in the next section, the results obtained from AlcoDens agree very closely with the results obtained doing alcohol dilution calculations using the TTB Table No.6 Method, which has been in use for 100 years by American distillers proofing their products.Ģ. ![]() This allows it to calculate alcohol dilution ratios very accurately. But the net effect is that ethanol and water molecules can pack together more tightly than expected and the volume shrinks.Īt the heart of AlcoDens is a database that has very accurate data for the density of ethanol and water mixtures. This is not a perfect analogy for the ethanol-water behavior because the change in volume has more to do with the non-polar ethanol molecules interfering with the charges on the polar water molecules than it has to do with the sizes of the molecules. Where did it go? The answer is the shrinkage or contraction that occurs when ethanol and water are mixed together.Īnyone who has mixed sand and stone to make concrete will know that 1 bucket of sand plus 1 bucket of stone make less than 2 buckets of mix because some of the sand fits into the spaces between the stones. There seems to be 0.696 gallons "missing". The results indicate that 10 gallons of 95 % ABV spirit blended with 14.446 gallons of pure water give a final blend volume of 23.75 gallons although the volumes of the raw materials add to 24.446 gallons. The volume of dilution water required is not as easy to check. This same quantity of alcohol constitutes 40 % by volume of the final blend so the volume of the blend is clearly 23.75 gallons (= 9.5 x 100/40). The initial 10 gallons of spirit had a strength of 95 % ABV so it must have contained 9.5 gallons of pure alcohol. It is easy to confirm that the total volume is correct. ![]() This screenshot from the AlcoDens alcohol dilution calculator gives 2 results - the volume of dilution water that must be added (14.446 gallon) and the final volume of the total blend (23.75 gallon). The only quantity that has been given is the 10 gallons for the volume of the 95 % spirit, so Source 1 is set as the "Known Quantity" in the bottom right block. ![]() In this example Source 1 is the 95 % ABV spirit and Source 2 is the water (with a strength of zero). In the screenshot below it can be seen that all the temperature options are set to 60✯ and all quantities are set to volumetric. This calculator can calculate the strength of a blend of 2 sources of known quantity and strength, but here it is used in the alternate mode where it will calculate the quantity of the sources required to achieve a target blend strength, as would typically be done when proofing to bottling strength. The AlcoDens Blending Calculator is one of several functions available in the AlcoDens program. It can be assumed that all measurements and blending are performed at 60✯ and all quantities are measured volumetrically. Calculate the volume of water required to dilute 10 gallons of spirit at 95 % ABV to create a product at 40 % ABV. ![]()
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