Equipment for a first batch
Updated
Less than any other craft in this estate, and one item on the list has to be right.
A short list
A digital scale. A stick blender. A heat-tolerant container for the lye solution. A mixing bowl or bucket that is not aluminum. A spatula. A thermometer. A mold. Splash goggles and gloves.
That is the whole first run, and it makes real soap.
No aluminum anywhere near the lye: it reacts. Stainless steel, heavy plastic or enamel.
The scale is the one that matters
Soap is a weight recipe throughout, and the lye quantity is the one measurement with no tolerance for error.
So: a scale reading to the gram, or better, with a tare function and a capacity that covers a full bucket of oils.
A kitchen scale reading in 5 gram steps cannot weigh lye for a small batch accurately enough, and that error is what a lye-heavy bar is.
It is the one item worth spending on before anything else.
Molds
A lined wooden box, a silicone loaf mold, or individual cavity molds.
A loaf mold with a cutter gives consistent bars and consistent weights, which is the labeling requirement.
Cavity molds give a finished shape and no cutting, at the cost of bar-to-bar weight variation.
Start with a loaf. It is what the craft uses and everything downstream assumes it.
What to add second
A cutter with a stop, when uneven bars start costing you weight margin.
A second mold, so a batch is not waiting on the first to be unmolded.
A planer or bevel tool, which is what makes a handmade bar look finished.
And then shelving, which is not equipment and is the real next purchase.