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Hydrated Lime
Hydrated Lime (or calcium hydroxide, or slaked lime) is usually a dry powder resulting from the controlled slaking of quicklime with water. The exothermic or released heat of reaction is captured and used to evaporate the excess slaking water.
Material Safety Data Sheet
Identification of the substance:
- Chemical name: Calcium hydroxide
- Product name(s): Hydrated Lime, Industrial Hydrate
- Formula: Ca(OH)2
- Molecular Weight: 74.08
- Material Uses: Water treatment, steel flux, caustic agent, pH adjustment, acid gas absorption, construction
Composition / Information On Ingredients:
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Grade
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92%
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90%
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85%
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80%
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75%
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70%
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Ava.Ca(OH)
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2 +/-92.0
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+/-90.0
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+/-85
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+/-80
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+/-75
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+/-70
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(Mgo)
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0.70
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0.80
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0.90
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1.05
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1.80
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2.9
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(SiO)2
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0.20
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0.50
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1.25
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1.5
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5.0 7
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Moisture%
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0.50
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0.70
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0.40
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0.40
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0.25
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0.3
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Colour
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PURE
white
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SNOW
white
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White
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White
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White
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White
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Fire Fighting Measures:
- Flash point: Non-flammable
- Autoignition temperature: Non-flammable
- Inflammability limits: None
- Explosion risk: None by itself, but heat produced by reaction with strong acids can generate steam and pressure
- Hazardous combustion products: Decomposes to produce calcium oxide (CaO), which can react with water to produce steam and pressure
- Extinguishing media: Use dry chemical fire extinguisher. Do not use water or halogenated compounds, except that large amounts of water may be used to deluge small quantities of hydrated lime. Use appropriate extinguishing media for surrounding fire conditions.
- Fire fighting instructions: Keep personnel away from and upwind of fire. Wear full firefighting turn-out gear (full Bunker gear), and respiratory protection (selfcontained breathing apparatus).
Physical And Chemical Properties:
- Physical State: Solid
- Odor & Appearance: Odorless, white powder
- pH: 12.4 in saturated water solution at 25oC
- Melting point: 580oC
- Boiling point: 2850oC
- Vapor pressure: Non volatile
- Vapor density: Non volatile
- Density: 2.24 g/cc
- Solubility: Slightly soluble in water: 0.2% @ 0o C Soluble in acids, glycerin and sugar solutions
Stability And Reactivity:
- Stability: Stable products, not very soluble.
- Decomposition temperature: 580oC, forms calcium oxide (CaO) and water
- Reactivity: Reacts with acids to form calcium salts while generating heat.
- Reacts with carbon dioxide in air to form calcium carbonate.
- Conditions to avoid: Vicinity of incompatible materials
- Incompatible materials: Acids; reactive fluoridated, brominated or phosphorous compounds; aluminum (may form hydrogen gas), reactive powdered metals; organic acid anhydrides; nitro-organic compounds; interhalogenated compounds
- Hazardous decomposition products: Calcium oxide (CaO)
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