Soap Making Tools
Choose a soap mold by the finished shape
Start with the bar you want to make and the work you want to do after unmolding. A loaf, a slab and a cavity tray solve different parts of that job.
Decide where the bar shape comes from
An individual cavity defines the bar outline at the mold. A loaf defines the cross-section and leaves thickness to the cutter. A slab gives you a larger block to divide. Choose a cavity tray if the molded pattern should carry over to each bar, or compare a loaf when a cut face is central to the design.
Use the inside dimensions for fit
For a loaf, compare the length, width and depth of the cavity against the shape you want to cut. Use exterior dimensions for shelving, clearance and bench space. A manufacturer can describe a mold as 10 inches long while listing a longer outer measurement. For a supported liner, compare the shape of its rim and base as well as the number printed on the label.
Check how the maker reports capacity
A capacity can refer to one well, a complete tray or the full loaf cavity. Fill volume and finished bar weight measure different things. Compare the reported unit and the part it applies to. If the listing gives only an overall amount for a tray, use its cavity measurements to compare the individual bar outline.