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CARBIDE LIME
Product Name:
Calcium Carbide Lime
Chemical Name:
Calcium Hydroxide
Formula:
Ca(OH)2 0
Chemical Family: Metal Hydroxide 1 0
Use:
Various chemical and industrial uses such as pH control, industrial water and

sewage treatment, stabilization and agricultural.
Synonyms:
Carbide sludge, generator slurry, lime slurry, carbide lime, lime sludge, lime

hydrate, calcium hydrate, hydrated lime, lime water, slaked lime.
¨ ¨

NFPA Fire: 0 HMIS Fire:
0 Acute:
Yes

NFPA Health: 1 HMIS Health:
1 Chronic:
No

NFPA Reactivity: 0 HMIS Reactivity:
0 Fire:
No

NFPA Special Hazard: Mixture:
Yes Reactive:
No

Sudden Release Pressure:
No
02. INGREDIENTS - COMPOSITION & INFORMATION

PERCENT EXPOSURE GUIDELINES
COMPONENT CAS No. (BY WT.) OSHA - TWA ACGIH - STEL
Calcium hydroxide 1305-62-0 92.5% 92.5% 5 mg/m3 5 mg/m3
Calcium carbonate 1317-65-3 1.8% 1.8% 5 mg/m3 10 mg/m3
Silica SiO2 1.5% 1.5%
Iron and Alumina Oxides 1.6% 1.6%
03. HAZARDS IDENTIFICATION

EMERGENCY OVERVIEW:

Warning:
May cause skin and eye irritation and burns.

Potential Health Effects Information:

Routes of Exposure:

Inhalation:
Irritating to respiratory tract. Experienced as nausea, vomiting, cough, excess

sputum, and chest discomfort. May cause pulmonary edema.

Eye Contact:
Exposure may cause severe irritation, experienced as pain, excess tearing,

conjunctival edema and hemorrhage, corneal edema and opacification.

Skin Contact:
Exposure may cause irritation, seen as redness, with possible swelling.

Ingestion:
Exposure can cause burns to mouth, throat, and digestive tract.

Chronic Effects:
None established.

Medical Conditions Aggravated By
Inhalation may aggravate asthma and inflammatory or fibrotic pulmonary disease.

Overexposure:
Because of its irritating properties this material may aggravate an existing

dermatitis.

Other Effects Of Overexposure
None.

Carcinogenicity:
Calcium hydroxide is not listed by NTP, OSHA or IARC.
04. FIRST AID MEASURES

Inhalation:
Remove to fresh air. If not breathing, give artificial respiration. If breathing is

difficult, give oxygen. Get immediate medical attention.

Eye:
Immediately flush with plenty of water and continue flushing for at least fifteen

minutes. It may be necessary to physically remove solid particles with a swab. See

a physician, preferably an ophthalmologist, immediately.

Skin:
Remove contaminated clothing. Wash skin twice with soap and water. Wash

clothing before reuse.

Ingestion:
Give two glasses of water. Do not induce vomiting. Call a physician.

Note To Physician:
Use of acidics to neutralize swallowed contents is contraindicated. Use of an

EDTA (ethylenediamine tetraacetic acid) solution for rinsing the eyes may help to

remove solid particles of the material and relieve some corneal opacification
05. FIRE FIGHTING MEASURES

Flash Point:
Not applicable.

Autoignition:
No applicable.

Flammable Limits - Lower:
Not applicable.

Flammable Limits - Upper:
Not applicable.

Extinguishing Media:
Calcium hydroxide cannot catch fire.

Fire Fighting Instructions:
None.

Fire And Explosion Hazards:
This material is a co-product from acetylene generation. A limited amount of

acetylene temporarily remains in solution in the carbide lime slurry at the time of

discharge from the generation process. With subsequent agitation from handling

and retention in open vessels, the acetylene evolves from solution. A combustible

gas mixture could possibly form as a result of the acetylene released into the

surrounding air. Acetylene is an extremely flammable gas, which forms explosive

mixtures with air and oxidizing agents.

Hazardous Combustion Products:
None known.

Sensitivity To Static Discharge:
Not applicable.

Sensitivity To Mechanical Impact:
Not applicable.
06. ACCIDENTAL RELEASE MEASURES

Steps to be taken is material is released
Evacuate all personnel from affected area. Use appropriate personal protective

or spilled:
equipment when responding to spills. Keep product contained.

Small Release:
Carefully scoop or shovel into a clean dry container for disposal or recovery. For

lime that has dried, avoid creating dust. Recovered lime may be collected for reuse.

Small amounts may be diluted with water, and flushed to sewer if appropriate

approvals are obtained.

Large Release:
Keep unnecessary people away. Isolate hazard area. Stay upwind in event of dried

material present, and uphill in the event of a slurry spill. Protective clothing and

equipment may be necessary to prevent exposure to lime. Personnel responding to

large spills should have training in lime characteristics and spill response. Avoid

creating dust if material has dried. Keep material away from waterways and

sewers.
07. HANDLING AND STORAGE

Storage:
Store in a clean, ventilated area. Isolate incompatible materials. Post "NO

SMOKING" or "NO OPEN FLAMES" signs. Accumulations of acetylene after its

release from the slurry, or from unreacted carbide which continues to generate

acetylene, can be ignited by any ignition source. All electrical equipment used in or

around carbide lime handling or storage areas should comply with the requirements

of the National Electrical Codes.

Handling:
Consumption of food or beverages should be prohibited in the work area. Access to

storage and handling areas should be limited to trained authorized, personnel only.

Maintenance in carbide lime areas should only be started after the atmosphere has

been checked to ensure that explosive conditions do not exist.
08. EXPOSURE CONTROLS - PERSONAL PROTECTION

Engineering Controls:

Ventilation:
Use local exhaust and/or forced ventilation to reduce dust concentrations, if any, to

below the exposure limit.

Respiratory Protection:

General Use:
Respiratory protection is normally not necessary with adequate ventilation. A

NIOSH / MSHA approved respirator with dust cartridge should be used in dusty

conditions.

Emergency Use:
Same as above.

Gloves:
Leather gloves for dry material and rubber gloves for slurry.

Eye/Face Protection:
All personnel working with or in the area of carbide lime should wear eye protection

with side shields. In areas where splashing of lime slurry is likely to occur,

chemical splash goggles and a full face shield should be worn for further protection.

Other Protective Equipment:
Personnel should wear long-sleeved shirts and long trousers. Clothing which may

come in contact with carbide lime should be washed thoroughly before reuse. All

areas where carbide lime is handled should have an approved and easily accessible

eye wash and safety shower.
09. PHYSICAL AND CHEMICAL PROPERTIES

Physical State:
Solid or liquid

Color:
White-gray

Odor:
Odorless, dust inhalation may be irritating. Slightly bitter, alkaline taste. There may

be a slight garlic-like odor present in fresh carbide lime hydride due to minute

amounts of dissolved acetylene. The odor dissipates quickly when exposed to air.

Molecular Weight:
74.1

Boiling Point:
1076°F (580°C) Disassociates to form water and calcium oxide.

Specific Gravity:
2.24

Freezing/Melting Point:
4658°F (2570°C) for calcium oxide.

Vapor Pressure:
Not applicable

Vapor Density:
Not applicable

Water Solubility:
.185g/100 cc water

Expansion Ratio:
Not applicable

pH:
12.454 @ 25°C (77°F)

Odor Threshold:
Not applicable

Evaporation Rate:
Not applicable

Coefficient Of Water/Oil Distribution:
Not applicable
10. STABILITY AND REACTIVITY

Chemical Stability:
Stable

Conditions To Avoid:
None currently known.

Incompatibility With Other Materials:
Acidic material, organic nitro compounds, maleic anhydride, phosphorus, and copper.

Hazardous Decomposition Products:
Calcium oxide (formed when heated above 1076°F (580°C)).

Hazardous Polymerization:
Will not occur
11. TOXICOLOGICAL INFORMATION

LD50:
7340 mg/kg (oral - rat)

Caution:
Lime is nontoxic, however it may cause skin and eye irritation and burns. The

irritant effects of lime are due primarily to its alkalinity, but dehydrating and thermal

effects may be contributing factors.

Irritancy Of Material:
Yes

Reproductive Effects:
None.

Teratogenicity:
None.

Synergistic Materials:
None.

Sensitization To Material:
None.

Mutagenicity:
None.
12. ECOLOGICAL INFORMATION

Physical/Chemical:
While carbide lime may not be considered a hazardous material, adequate

precautions should be taken to prevent unauthorized discharge, spills or leakage into

rivers, lakes, streams, sewers, or on to lands where it may adversely affect the

environment or wildlife. Due to the alkalinity of lime it may be subject to different

regulations in different locations. Some local ordinances may be more restrictive

than federal regulations.

Lime does not contain any Class I or Class II ozone depleting chemicals. (40 CFR

82). Lime is not listed as a marine pollutant. (49 CFR Part 171).

Acute and Long Term Toxicity to Fish and Invertebrates TLm Mosquito Fish: 240

ppm/24 hr; 220 ppm/48 hrs; 160ppm/96 hr @ 69.8-73.4° F (21-23°C)
13. DISPOSAL CONSIDERATIONS

Waste Disposal Method:
Recovered lime can be collected and reused for many applications such as water

treatment, road stabilization, and acid neutralization.


When disposal becomes necessary, dispose in accordance with federal, state, and

local government regulations. Consult environmental regulatory agencies for

guidance on acceptable disposal practices.
14. TRANSPORT INFORMATION

DOT/IMO Shipping Name:
Not applicable.

Hazard Class:
Not applicable.

Identification Number:
Not applicable.

PIN:
Not applicable.

Product RQ:
Not applicable.

Shipping Label:
Not applicable.

Placard (When Required):
Not applicable.

Special Shipping Information:
None.

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