How shaving cream is made
Canned shaving foam carries a flammable gas, yet the can is safe because the cream inside is mostly water.
- stations
- 7
- things upstream
- 28
- raw sources
- 13
- steps from the ground
- 5
The short version
Shaving cream is a soap emulsion. Plant fats and fatty acids such as stearic acid are turned into soft soap with potassium hydroxide or triethanolamine, then blended with water, glycerin and oils. For foam, the cream goes into an aluminum or tinplate can, a valve is crimped on, and a liquefied hydrocarbon propellant such as propane, butane or isobutane is pushed in under pressure.
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Melt the fats
Vegetable fats such as palm and coconut oil are warmed until liquid. Stearic acid is often added because it makes the lather denser and longer lasting.
Goes in -
Turn fat into soft soap
An alkali splits the fats and bonds with the fatty acids to make soap. Potassium hydroxide gives a soft soap that foams easily, unlike the hard bar soap made with sodium hydroxide. Triethanolamine is another common choice.
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Blend the cream
The soap is stirred with water, glycerin, emollients and emulsifiers into a smooth cream. A typical cream is 20 to 30% soap with up to about 10% glycerin.
20 to 30% soap
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Fill the cans
A measured dose of cream is pumped into each can. Personal care foams often use aluminum cans, and others use lacquered tinplate.
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Crimp on the valve
A valve is seated in the can's opening and its cup is crimped tight to the inside rim. The valve design sets how fast the foam comes out.
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Charge with propellant
Liquefied hydrocarbon gas is forced in through the valve, up to about 10% of the contents. Inside the can it stays partly liquid, refilling the headspace as foam is used. Because the gas is flammable, these filling machines often sit in a separate gas house.
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Snap on the button
An actuator with a shaped nozzle is pressed onto the valve stem, then the cap goes on. A spring in the valve closes it each time the button is released.
Worth repeating
- Rise, the first pressurized shaving cream, arrived in 1949, and within a decade cans held two-thirds of the American market.
- Barbasol, created in 1919 by a former MIT professor, was at first filled and packed entirely by hand in Indianapolis.
- Around 3000 BC in Sumer, men softened their beards with a mix of wood alkali and animal fat.
Back to the ground
Follow every input upstream and shaving cream starts as these 13 raw sources.
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Sources
These sources say little about the factory steps themselves, so parts of this line are a general description. Treat the details with care, and tell us if you know better.
Cite this page: "How shaving cream is made." Assembly Line, 2026-11-03. https://assemblyline.org/make/shaving-cream