3. Filling the generator

3.1 Propellants

Propellants used for aerosol packaging must meet the following criteria.

• Pressure: suitable for a wide range of products, sufficient to allow complete emptying of contents, not influenced by misuse (reverse position), taking into account container type (metal, bare glass, plastic-coated glass).

• Odor and color: these should be kept as low as possible.

• Purity of propellants: propellant manufacturers supply controlled-purity products for aerosols. In the case of pharmaceutical use, a purity of 99.8% is required, with a maximum quantity not to be exceeded for each type of impurity.

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