For nonpressurized flammable products, what is the flashpoint range?

• A. -54°C - (-10°C)
• B. 0°C - 100°C
• C. -7°C - (+10°C)
• D. -20°C - 0°C

Answer: (C)

Flashpoint is the temperature at which enough vapour is released to form an ignitable mixture with air. For nonpressurized flammable liquids, volatility is relatively high, so their flashpoints are typically around subzero up to near room temperature. The range around -7 °C to +10 °C best reflects those common values, capturing liquids that can give off enough vapour to ignite at cool to mildly warm conditions.

The other ranges describe conditions that aren’t as representative for nonpressurized pesticide-related flammable products: one extends to very low temperatures like -54 °C, implying an unusually volatile substance outside typical pesticide solvents; another reaches up to 100 °C, which would include liquids with much higher flashpoints and aren’t considered flammable under standard classifications; and ending at 0 °C misses liquids with positive flashpoints that can still ignite at ambient or slightly elevated temperatures.