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Table 1: Relative Breakthrough Ratio of KGC-1M(C) in comparison with various organic solvents

Following is the method of calculating service life of KGC- 1M(C) used in the environment with the gas concentration level of 300ppm. (Example) Relative Breakthrough Ratio of Acetone: 0.49 (Refer to Table 1) Service life of KGC-1M(C) related to cyclohexane concentration of 300ppm: 200 min. (Refer to Breakthrough Table) Calculation of service life of acetone: 200 (min.) x 0.49 = approximately 98 (min.)

>Make sure NOT to reuse cartridges that were used to remove organic solvents with short service life calculated by the relative breakthrough ratio, such as methanol, carbon disulfide, acetone and dichloromethane. >Understand the estimated service life and replace the cartridge well in advance according to the replacement schedule. Besides target gas, cartridge also captures water droplets in the environment; in other words, the higher humidity is, the shorter service life becomes. And service life becomes shorter as temperature in the environment increases. >To establish replacement schedule of a cartridge, calculate its service life first, and then, set a safe criteria taking such factors as temperature and humidity in consideration. As a characteristic of organic vapor, the cartridge tends to reach to breakthrough before calculated service life if repeatedly used for several days. Make sure to establish a replacement schedule requiring the wearer to replace the cartridge well in advance.