Product Identification

Product Name

Silica

Synonyms

Cristobalite
Dioxosilane
Infusorial earth
Quartz
Sand
Silic anhydride

CAS

7631-86-9

Formula

O2Si

Molecular Weight

60.09

EINECS

231-545-4

RTECS

VV7565000

RTECS Class

Other

Merck

12,8637

Beilstein/Gmelin

9357 (G)

Physical and Chemical Properties

Appearance

Transparent crystals or amorphous powder. Odorless.

Solubility in water

Insoluble

Melting Point

1719

Boiling Point

2230

Density

2.2 g/cm3 (20 C)

Usage

Manufacture glass, water glass, refractories, abrasives, ceramics, enamels, in scouring-& grinding-compd, ferrosilicon, molds for castings, decolorizing & purifying oils, petroleum products, etc.

Refractive Index

1.193

First Aid Measures

Ingestion

Never give anything by mouth to an unconscious person. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.

Skin

Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.

Eyes

Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. If irritation develops, get medical aid.

Handling and Storage

Storage

Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from moisture.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.

Hazards Identification

Inhalation

May cause respiratory tract irritation. May cause lung damage. Contains crystalline silica which may lead to respiratory abnormalities and silicosis.

Skin

May cause skin irritation.

Eyes

May cause eye irritation.

Ingestion

May cause digestive tract disturbances.

EC Risk Phrase

R 40 37

EC Safety Phrase

S 22 36/37

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves and clothing to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.

Respirators

Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.

Exposure Effects

Prolonged exposure to respirable crystalline quartz may cause delayed lung injury/fibrosis (silicosis).

Exposure limit(s)

IDHL: 3000 mg/m3

Poison Class

-

Fire Fighting Measures

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Fire Potential

Nonflammable.

Accidental Release Measures

Small spills/leaks

Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Disposal Code

14

Incompatibilities

Magnesium.

Stability

Stable under normal temperatures and pressures.

Decomposition

Irritating and toxic fumes and gases.

Transport Information

HS Code

2811 22 00