Product Identification

Product Name

Silicon dioxide

Synonyms

Samd
Silicic anhydride
Silicon dioxide

CAS

14808-60-7

Formula

O2Si

Molecular Weight

60.08

EINECS

238-878-4

RTECS

VV7330000

RTECS Class

Tumorigen; Mutagen; Human Data

Beilstein/Gmelin

13882 (G)

Physical and Chemical Properties

Appearance

Colorless, white or variable, black, purple, green crystals.

Solubility in water

Insoluble

Melting Point

1427

Boiling Point

2230

Vapor Pressure

10 at 1732 C

Density

2.622 - 2.645 g/cm3

Usage

Used in mining, quarrying, tunnelling, foundries. Used in the fabrication of stone and clay products; the manufacture of glass, enamels, ceramic products and glazes; as an abrasive and grinding media.

First Aid Measures

Ingestion

Treat symptomatically and supportively. Get medical aid.

Inhalation

Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.

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.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage

Storage

Store in a dry area.

Handling

Use only in a well ventilated area. Minimize dust generation and accumulation. Avoid ingestion and inhalation.

Hazards Identification

Inhalation

Dust is irritating to the respiratory tract.

Skin

Dust may cause mechanical irritation.

Eyes

Dust may cause mechanical irritation.

Ingestion

May cause irritation of the digestive tract.

EC Safety Phrase

S 22

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear dust goggles. Skin: Wear appropriate gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.

Respirators

A NIOSH/MSHA approved air purifying dust or mist respirator or European Standard EN 149. Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Exposure Effects

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

Exposure limit(s)

NIOSH REL: Ca TWA 0.05 mg/m3 See Appendix A NIOSH IDLH: Potential occupational carcinogen 25 mg/m3 (cristobalite, tridymite); 50 mg/m3 (quartz, tripoli)

Poison Class

F (Not subject to toxicity classification)

Fire Fighting Measures

Fire Fighting

Not flammable. Use extinguishing media and protective equipment most appropriate for surrounding fire.

Accidental Release Measures

Small spills/leaks

Vacuum or sweep up material and place into a suitable disposal container. Avoid generating dusty conditions.

Stability and Reactivity

Incompatibilities

Dissolves readily in hydrofluoric acid, forming silicon tetrafluoride, a corrosive gas. Reacts violently with powerful oxidizers such as chlorine trifluoride, manganese trifluoride, oxygen difluoride, vinyl acetate, and certain other fluorine-containing compounds. Will be attacked by strong alkalis.

Stability

Stable under normal shipping and handling conditions.

Decomposition

Irritating and toxic gases.

Transport Information

HS Code

2506 10 00