Pressurized Containers

Pressurized container – suitable for compressed, liquefied or dissolved gas fitted with a device that, after its actuation, produces a controlled spontaneous release of the contents at atmospheric pressure and room temperature.

Aerosol Filling Methods

  • Positive Displacement Product Filling

    This method has a fill accuracy typically + or – ½ mL and capable of filling many different product types and viscosities up to 50,000 centipoise.

  • Gassing Through the Aerosol Valve Stem
    1. The head lowers onto the crimped can sealing on the aerosol valve stem or pedestal.
    2. Gas is injected via a gas metering pump into the aerosol valve either by hydraulic force or mechanically opening the aerosol valve.
    3. The head raise off the aerosol valve which allows the valve to close.


    • Only ¼ to 1 cc gas loss between the aerosol valve and gassing head each cycle.
    • Maintenance is minimal.
    • Modern valves fill at 100 cc per second.


    • Some metered valve do not work.
  • Under the Cup Gassing
    1. Vacuum is pulled to evacuate moisture and atmospheric pressure that may corrode the can or contaminate the product.
    2. The aerosol valve is lifted form the can top opening.
    3. Gas is injected around the aerosol valve into the aerosol into the aerosol can from a metered injection pump.
    4. The aerosol valve is pushed back into the can top opening for the crimping process.


    • Faster gassing.
    • Meter dosed valve can be gassed.
    • Gassing button on valves is faster.


    • 3-5 mL of gas loss left between the can and the crimp head per cycle, requiring costly reclaim due to Environmental Protection Agency (EPA) regulations.
  • Nitrous Oxide and Carbon Dioxide Gassing

    Nitrous oxide and carbon dioxide are used as propellants to deliver food products.

         Method 1 – Gas is mixed with the product in saturation towers until blended properly. The product and CO2 are filled into the aerosol container as one.

         Method 2 – Gas is injected through the aerosol valve stem using time over high pressure. Sometime the CO2 is heated to aid in saturation. Shaking is common during gassing.

        Method 3 - CO2 is injected under the aerosol valve cup using time over pressure. Restricted valve lift helps to create turbulence for saturation.


    • Non flammable
    • Does not always require shaking


    • Product incompatibility may arise.
    • Can orientation is critical to ensure gas does not empty before product is empty.