Measuring by Weight
The very best way to figure your water/powder is by weight, not volume.
Alginate can be completely "fluffed" or completely "packed", but it is usually somewhere in between. This makes a volumetric measurement less than ideal. One mix might be thin and the next one thick, and it can be difficult to diagnose the problem.
We go to great pains to make our alginates so their working properties are terrific for your type of job. If the alginate is thinner or thicker than normal, it could make your job more difficult.
Our alginates have been formulated so the ideal mixing ratio is 4:1 (water to powder- BY WEIGHT).
Measuring by Volume
Over the years, however, we have found that very few of our customers actually use a scale. Amateurs don't have one and professionals have figured out how portion without one.
This leaves us with volumetric measurement. Our competitors claim that their alginates should be measured out 1:1. Accu-Cast alginates have more of the expensive seaweed component than theirs and thus require more water than that. We've found that the best measurement is 1 part powder to 1.5 parts water for most of our alginates.
Example: Our competitors recommend 1 cup water for each 1 cup of powder. We are recommending 1.5 cups of water for each 1 cup of powder.
Of course, this means that Accu-Cast alginates produce MORE actual alginate mixture than those of our competitors- about 50% more, making it more economical. For example, we recommend 1/4 pound of our 590-IBG formula for a face casting where our friends at Smooth-On recommend a full pound.
Now you know.
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