Crystal SLS Free Stephenson Soap Base 11.5 kg

Why bulk sulfate-free soap base fits continuous production lines

An 11.5 kg block is built for workshops and manufacturing lines that run predictable volumes and prefer fewer restocking cycles. Crystal SLS Free belongs to the Stephenson Soap Base range, produced by a British manufacturer known for clear, pliable bases designed for melt and pour bar manufacturing. Skipping the harsh foaming agent sodium lauryl sulfate makes the base gentler on skin, which is why formulators frequently choose it for children's lines, sensitive skin products, and spa-oriented collections.

The primary application of this base is the production of solid bars — hygiene bars, decorative pieces, gift sets for hotels and salons, and promotional batches for retail chains. Traditional soap making sits at the core of this use case, since the base itself was originally engineered for melting and pouring into molds, and the large format suits businesses running conveyor-style production or fulfilling wholesale orders on a regular schedule. Beyond classic bars, the same base is also used for solid shampoo bars, facial and body cleansing tablets, and experimental household cleaning formats.

Melting is typically done in a double boiler or dedicated melter at around 60-70 degrees Celsius, avoiding overheating and vigorous stirring that would introduce air bubbles. Active additives — carrier oils, extracts, colorants, fragrances — should be added once the melted mass cools to roughly 55-60 degrees, preserving their beneficial properties. A common dosage is 1-3% for oils, 1-3% for fragrance, and 0.1-0.5% for colorants depending on the desired shade intensity. For layered designs, this base pairs well with Creamy Soap Base Crystal OPC, which brings a contrasting opaque texture, and with Soap base Crystal SLES & SLS Free (SS) for a denser lather while staying within a sulfate-free formula.

It's also worth noting the compatibility with shaving line products: built on a similar formulation approach is the Shaving base Crystal Shaving Base (SSB), useful when developing coordinated men's grooming sets where a solid bar and a shaving product share the same packaging style.

For storage, keep the large block in a dry area at room temperature, away from direct sunlight and moisture, sealing the container tightly after each use to prevent condensation on the surface. Proper storage conditions allow the base to retain its working qualities over an extended period, which matters for manufacturers planning purchases across several production runs.

Oatmeal honey batch for continuous molding

Crystal SLS Free soap base 1000 g

Sweet almond oil 25 g

Raw honey 20 g

Ground oatmeal 15 g

Vitamin E oil 5 g

Cut the base into cubes and melt in a double boiler until smooth, avoiding boiling. Remove from heat, let it cool to about 55-60 degrees, then stir in the almond oil, honey and vitamin E oil until fully blended. Fold in the ground oatmeal gently to avoid trapping air, then pour the mixture into molds. Allow the bars to set at room temperature for several hours before unmolding and packaging.