Wood preservation facilities, chromated copper arsenate: chapter B, table 2
Table 2. Physical and Chemical Properties of CCA Concentrate Solution
Identification
| Common synonyms | ACC |
| CAS Number | 1556 |
| United Nations (UN) Number |
|
| Registrant in 2012 | Arch Wood Protection Canada Corp. (Mississauga, ON)
Timber Specialties Ltd. (Campbellville, ON)
Chemical Specialties, Inc. (Charlotte, NC; Gilmar, TX; Augusta, GA)
|
Transportation and storage information
| Shipping state | Liquid concentrate |
| Concentration | 50% to 60% by weight |
| Classification | Poisonous; corrosive oxidizer |
| Storage temperature | Ambient |
| Inert atmosphere | No requirement |
| Venting | No requirement |
| Containers/materials | Bulk truck or train |
| Placards | Class 6.1 P.G II (Check with Transport Canada) |
| Delivery format | Bulk rail and truck |
Physical and chemical properties
| Physical state | Liquid (20°C, 1atm) |
| Solubility | Freely soluble (water) |
| pH | Strongly acidic (pH 1.6 to 3.0) |
| Vapour pressure | Non-volatile |
| Active ingredients | CrO3, CuO, As2O5 |
| Concentration of work solutions | 0.5% to 10% by weight |
| Floatability | Dissolves readily in water |
| Freezing point | -30°C |
| Flash point | Not flammable |
| Explosive limits | Not explosive or flammable |
| Specific gravity | 1.64 @ 50% concentrate |
| Appearance | Heavy liquid, dark brown |
| Colour | Dark brown (concentrate) to yellow-green (dilute) |
| Odour | Odourless |
| Typical preservative retention in treated wood | 4.0 to 24 kg/m3 (0.25 to 1.5 lb/ft3) |
Hazard Data
Fire
| Extinguishing data | Not combustible; common extinguishing agents can be used with fires involving CCA solutions. |
| Fire behaviour | On exposure to high temperatures CCA may emit arsenic fumes. Containers may rupture due to chromic acid reactivity. Chromic acid may reduce the combustibility of other materials. |
| Ignition temperature | Not combustible |
| Burning rate | Not combustible |
Reactivity
| With water | No reaction |
| With common materials | Contact with reducing agents (such as aluminium or zinc) may liberate arsine gas (AsH3 - colourless, highly toxic) and/or may cause violent explosions due to chromic acid reactions. Contact with combustible materials (such as acetic acid, acetone, ammonia, alcohol, glycerol, hydrocarbons, hydrogen sulphide, naphthalene, sulphur and turpentine) may result in violent reactions and subsequent fire and/or explosions. |
| Stability | Stable |
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