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Indicator: 20 ~ 500 ppm
Measuring Range: 2 ~ 500 ppm
Sampling Hours: 1 to 10 hours
Colour Change: White → Brown
Coefficient of Variation: 10% (20 ~ 500 ppm-hr)
Nr. of tests: 10
| Measuring Range | 2 to 500 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 1 ppm (10 hours) |
| Colour Change | White → Brown |
| Reaction Principle | Toluene react with formaldehyde to form condensation polymer, which is brown in colour. |
| Coefficient of Variation | 10% (for 20 to 500 ppm-hr) |
| Shelf Life | 2 Years |
| Corrections for temperature & humidity | Unnecessary |
| Store the tubes at cool and dark place. | |
| Substance | Concentration | Interference | Change colour by itself to |
| Aromatic hydrocarbons | + | Brown | |
| Alcohols, Ketones, Esters |  30ppm |
No | No |
| Substance | Correction Factor | Sampling Time | Measuring Range |
| Xylene | Factor: 1.7 | 1 to 10 | 3.4 to 850 ppm |
| Ethyl benzene | Factor: 1.4 | 1 to 10 | 2.8 to 700 ppm |
| Cumene | Factor: 1.7 | 1 to 10 | 3.4 to 850 ppm |
| Benzene | Factor: 1.2 | 1 to 10 | 2.4 to 600 ppm |
| Stylene | Factor: 13 | 1 to 10 | 26 to 6500 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 20 ppm(2014) | - | 1.4 to 6.7% |
