Many people finish the shaving foam testing and are satisfied with the good foam that comes out, but after mass production, it separates after a month or cannot be sprayed in winter. This is because the testing was not thorough enough.

Basic Performance Testing: These are the must-do items

 1. Internal pressure test: 25 ℃ After maintaining a constant temperature for 30 minutes, the pressure should be between 0.3-0.6MPa; too low and it won't spray, too high and it's unsafe.

 2. Spray rate: The amount sprayed in 5 seconds should be between 3-5g; too fast and it sprays too much at once, too slow and it's difficult to use.

 3. Foam appearance: The sprayed foam should be fine and dense, without large bubbles. I made a batch before where the foam was full of large bubbles that broke as soon as applied. Later, I adjusted the ratio of the propellant and it improved.

Stability testing: This is the key to mass production.

 - Hot and cold cycle test: -15 ℃ Leave for 24 hours, then 45. ℃ Leave it for 24 hours, repeat the cycle 3 times, and check for any separation or change in taste. My initial sample separated into layers after just one cycle, but after adjusting the amount of emulsifier, it passed the test.

 - Room temperature sample retention: Keep for at least 1 month to check for water separation or discoloration. I had a sample that looked fine when it was freshly made, but after 20 days, a layer of oil floated to the top. Later I realized it was because the preservative was added in insufficient amounts, and it had grown bacteria.

Shaving foam sample testing is a crucial step in the process of transitioning from product formula development to large-scale production. This is especially true for aerosol products like shaving foams, where its significance is self-evident. Through rigorous sample testing, core indicators such as formula stability, foaming effect, skin sensation experience, odor compatibility, and pressure safety of the container can be verified in advance. This enables the timely detection of formula flaws, process hazards, and usage issues, thus preventing small problems from escalating during the mass production stage.

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