The quality of fire extinguishing foams and the foam concentrates they are generated from is assessed according to various criteria:

Foam compounds:

- Storage

- Frost resistance

- Compatibility with other foam concentrates

- Physiological properties

- pH value

- Environmental compatibility

- Viscosity

Fire extinguishing foam:

- Combustion resistance

- Ageing characteristics

- Film formation

- Flowing characteristics

- Gas tightness

- Adhesiveness

- Fire performance

- Compatibility with other foams upon use

- Powder compatibility

- Seawater resistance

- Foam expansion

- Water drainage time