After vacuuming, the oxygen in the bottle decreases, which can prevent the oxidation of components, stabilize the activity of components, and inhibit the survival of microbes, so it can prolong the storage time. But the maintenance is liquid and cannot be completely vacuumed like a solid, so the extension time is limited. In fact, most packages that appear to be sealed are not vacuumed. To determine whether a vacuum bottle is a vacuum, just look at the hole in the bottom of the bottle. Cover the vent and it will not squeeze. Most sealed packages take out the rest of the air after production, not really vacuuming. The usual spray is designed to pressurize the bottle with nitrogen, not a vacuum.
"Compression pump" is not the basis to determine whether the vacuum, but still to see whether there are air holes at the bottom of the bottle. If there is no air hole, it is a general design of compression pump, only to squeeze the liquid out by pressure. Another "sterile tank" design, which claims to be safer than a vacuum, has hoses and special bottle caps that can see the body of the bottle gradually shrink after the use of the hose. It is used when extruding, because do not draw air back, so do not let the emulsion back, can prevent pollution.
The jar itself is not a vacuum design that cannot be changed, so you can put the bottle together in a vacuum bag and pump out the air. The point of this preservation is only to delay the deterioration of the product when you don't use it for a long time, but it doesn't really effectively guarantee that the cosmetics are sterile. The maintenance product with high nutritional activity is recommended to be used up within 3 months after opening, and the active ingredients reduce the contact between oxygen and sunlight after putting into the vacuum bag, which can prolong the preservation for about 1 month.
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