1. On the one hand, kerosene has good low-temperature performance, so when kerosene is used as a penetrant solvent at low temperature, the viscosity of the solution may be reduced, thus increasing the penetrant's permeability.

2. On the other hand, kerosene has strong volatility, which easily makes the penetrant fail in the volatilization process and weakens the permeation effect. In addition, the volatilization rate of kerosene may be faster at low temperature, so attention should be paid to the control of concentration.