Table 1.
Physical properties of PBDE mixtures.
| Property | Penta-BDE | Octa-BDE | Deca-BDE |
|---|---|---|---|
| Molecular weight | Mixture | Mixture | 959.22 |
| Color | Clear, amber to pale yellow | Off-white | Off-white |
| Physical state | Highly viscous liquid | Powder | Powder |
| Melting point | −7 to −3°C (commercial) | 85–89°C (commercial); 200°C (range, 167–257); 79–87°C; 170–220°C | 290–306°C |
| Boiling point | >300°C (decomposition starts above 200°C) | Decomposes at >330°C (commercial) | Decomposes at >320, >400, and 425°C |
| Density (g/mL) | 2.28 at 25°C; 2.25–2.28 | 2.76; 2.8 (commercial) | 3.0; 3.25 |
| Solubility: | |||
| – Water | 13.3 μg/L (commercial); | < 1 ppb at 25°C (commercial); | < 0.1 μg/L |
| 2.4 μg/L (pentabromodiphenyl ether component); | 1.98 μg/L (heptabromodiphenyl ether component) | ||
| 10.9 μg/L (tetrabromodiphenyl ether component) | |||
| – Organic solvent(s) | 10 g/kg methanol; miscible in toluene | Acetone (20 g/L); benzene (200 g/L); methanol (2 g/L)—all at 25°C | d-limonene (0.1823 g/100 g solvent); n-propanol (0.1823 g/100 g solvent)—all at 20°C * |
| Partition coefficients: | |||
| – Log Kow | 6.64–6.97; 6.57 (commercial) | 6.29 (commercial) | 6.265 |
| – Log Koc | 4.89–5.10 | 5.92–6.22 | 6.8 |
| Vapor pressure | 2.2 × 10−7−5.5 × 10−7 mm Hg at 25°C; 3.5 × 10−7 mm Hg (commercial) | 9.0 × 10−10–1.7 × 10−9 mm Hg at 25°C; 4.9 × 10−8 mm Hg at 21°C (commercial) | 3.2 × 10−8 mm Hg |
| Henry's Law constant (atm-m3/mole) | 1.2 × 10−5; 1.2 × 10−6; 3.5 × 10−6 | 7.5 × 10−8; 2.6 × 10−7 | 1.62 × 10−6; 1.93 × 10−8; 1.2 × 10−8; 4.4 × 10−8 |