Medium-Hazard TICs

High-hazard TICs are highly toxic, produced in large quantities, and vaporize easily. TICs that may be ranked high in one or two of these characteristics, but low in the rest, are grouped as medium hazards. Table 2.8 lists properties of selected medium-hazard TICs. 

The IDLH of the TICs in this group ranges from 1 ppm to 1200 ppm. Clearly, the volatility of each TIC in this group is higher than respective IDLH level. Vapor pressures are mostly lower than the compounds listed in the high-hazard group. 

---

Low-hazard TICs include compounds that have relatively low toxicity, VP, or volatility, and relatively small quantities are being produced, stored, or transported (Table 2.9). The threat from deployment of these TICs is considered much less likely than those listed as high or medium hazards. Nevertheless, their existence could still become threats to the public. 

More than 90 chemicals are considered TICs, and they are grouped as high, medium, and low hazards based on the combination of toxicity, volatility, and amount being produced, stored, and transported annually. Each TIC is ranked according to a hazard index (HI). The HI is the product of four factors, numerically ranked between 1 and 5 according to the ranking scheme in Table 2.6. 

---