Turning a batch into a product

Decide the dispenser before the formula

Foaming pump, lotion pump, disc top or flip top. Each has a viscosity it works in, and the foamer has by far the narrowest. Settling this first means formulating into a known target instead of discovering the target after the product is finished.

Then fix the viscosity, and measure it

Not by eye. A consistent viscosity is what makes a pump behave the same way on every bottle, and it is the number to hold batch to batch. Thickness is also what customers read as quality, so it is a commercial specification as well as a mechanical one.

Then preservation, which is not optional

A water-based product in a bottle somebody dips wet hands near is a growth medium. A preservation system appropriate to the formula, and evidence that it works, is part of making a liquid soap rather than an extra. This is the single most common gap in small-batch liquid products.

Then the claims, deliberately

Write what you intend to say before the artwork and check which category it puts you in. Cleans, washes and removes grease are plain claims. Kills, sanitizes, disinfects and antibacterial are not, and they land you in front of a regulator.

Then the label

Net quantity from the bottle and the fill, the ingredient declaration, the responsible party, and any warnings. For a plain soap that is a short list; for a sanitizer it is a Drug Facts panel and a different exercise entirely.

Test the filled package, not the beaker

Fill the real bottle with the real formula and use the real pump through a whole container. That catches viscosity, dip tube length and dose size together, and it is faster than reasoning about any of them separately.

References