The flashpoint gives the lowest temperature at which a mixture of vapours (solvent air) over a liquid can be ignited by a naked flame. Every flammable liquid has a specific temperature at which so much vapour develops that bringing it close to an ignition source creates a small flame. The flashpoint is not to be confused with the ignition point or ignition temperature. It is only used to measure the flammability of the vapours due to a naked flame above the air-liquid level. As a result, the flashpoint does not give the temperature of the flame.
In response to the question: "Explosion protection for the electrical equipment, yes or no?", the flashpoint of the processed materials is crucial, where the Flp threshold is set at 21°C.
Where ready-for-use products are used, the flashpoint of the ready-for-use material is decisive for the electrical installations of the coating area.
Where, on the other hand, the lacquer is prepared as ready-to-use in the coating area, the lowest flashpoint is decisive, whether it be of the lacquer, the solvent or the thinning agent. Lacquer and solvent storage areas, are in practice also to be regarded mostly as being at risk of explosions if the ambient temperature cannot be safely maintained below the lowest flashpoint of the substances stored there.
For coating where electricity is present, i.e. for electrostatic coating, only lacquers with a flashpoint over 21°C can be used.
- Acetone - 19°C
- Benzene - 8°C
- Toluol + 7°C
- Xylol + 23°C
- Timber turpentine + 31°