1. Environmental temperature : 20℃ - 40℃
2. Relative humidity : < 75%
3. Concentration of neutral fluid:
0.02-0.03mol/L (Test oil type pH value ＜ 0.01mgKOH/g)
0.03-0.05mol/L (Test oil type pH value ＞ 0.01mgKOH/g)