How is the ease of paint combustion measured?

The ease of paint combustion is primarily measured by its flash point. The flash point is the lowest temperature at which vapors from a volatile substance, such as paint, can ignite when exposed to an open flame or spark. This property is crucial because it indicates a material's flammability and helps in assessing its safety for handling and storage.

In the context of paints, a lower flash point suggests that the paint is more likely to ignite easily under normal conditions, making it important to understand when working with such materials, especially in environments where heat sources may be present. Proper knowledge of flash points aids in employing the right safety measures when using, storing, or disposing of paints, ensuring that fire risks are minimized.

The other factors listed, while important for different properties of paint, do not directly measure its combustibility in the same way. For example, viscosity affects application and flow, density can relate to coverage and drying times, and pH level influences the stability and reactivity of the paint but not its combustion properties.