Ethyl silicate

  • Tetraethyl orthosilicate
  • Ethyl silicate, condensed
  • Ethyl orthosilicate
  • Tetraethoxysilane
Formula
Si(OC2H5)4
Structure
Description
Colorless liquid with a sharp alcohol-like odor.
Uses
In weatherproofing and for hardening stone, arresting decay & disintegration, in manufacture of weatherproof & acid proof mortars & cements, in the lost wax process for casting of high-melting alloys.

Registry Numbers and Inventories.
CAS
78-10-4
EC (EINECS/ELINCS)
201-083-8
EC Index Number
014-005-00-0
EC Class
Flammable; Harmful; Irritant
R 10 20 36/37
RTECS
VV9450000
RTECS class
Primary Irritant
UN (DOT)
1292
Merck
13,3882
Beilstein/Gmelin
1422225
Beilstein Reference
4-01-00-01360
Swiss Giftliste 1
G-1195
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H20O4Si
Formula mass
208.33
Melting point, °C
-85.5
Boiling point, °C
168
Vapor pressure, mmHg
2.5 (25 C)
Vapor density (air=1)
7.2
Saturation Concentration
1300 ppm (0.1%) at 20 C (calculated)
Odor Threshold Odor threshold 85 ppm
Density
0.933 g/cm3 (20 C)
Solubility in water
Reacts
Viscosity
0.79
Surface tension
22.8 g/s2
Refractive index
1.3818 (20 C)
Partition coefficient, pKow
5.10
Heat of fusion
11.1 kJ/mol
Heat of vaporization
3.68 kJ/mol
Heat of combustion
-4870 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
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 to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
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.
Small spills/leaks
Remove all sources of ignition. Absorb spill using an absorbent, non-combustible material such as earth, sand, or vermiculite. Use a spark-proof tool. Provide ventilation. A vapor suppressing foam may be used to reduce vapors. Water spray may reduce vapor but may not prevent ignition in closed spaces.
Disposal code
13
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, reacts with water to form a silicone adhesive.
Decomposition
Carbon monoxide, carbon dioxide, silicon oxide.

Fire.
Flash Point,°C
45
Autoignition, °C
230
Upper exp. limit, %
23
Lower exp. limit, %
1.3
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Water Reactive. Material will react with water and may release a flammable and/or toxic gas. Use water spray to keep fire-exposed containers cool. Containers may explode when heated. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. Use water spray to cool fire-exposed containers. For large fires, use water spray, fog or alcohol-resistant foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Flammable/combustible material.
Hazards
May be ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
3
 
 
Reactivity
1
 

Health.
Exposure limit(s)
TLV: 10 ppm; 85 mg/m3 (as TWA) (ACGIH 1996). MAK: 20 ppm; 170 mg/m3; (1996) OSHA PEL: TWA 100 ppm (850 mg/m3) NIOSH REL: TWA 10 ppm (85 mg/m3) NIOSH IDLH: 700 ppm
Poison_Class
3
Exposure effects
Prolonged or repeated skin contact may cause defatting and dermatitis.
   Ingestion
May cause irritation of the digestive tract. May cause effects similar to those for inhalation exposure.
   Inhalation
Causes respiratory tract irritation. May cause liver and kidney damage. May cause lung damage. Causes narcotic effects including headache, dizziness, weakness, unconsciousness, and possible death.
   Skin
Causes skin irritation. Prolonged and/or repeated contact may cause defatting of the skin and dermatitis.
   Eyes
Causes severe eye irritation. Vapors cause eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1292
Response guide
Hazard class
3
Packing Group
III
 
USCG CHRIS Code
ESC
 
HS Code
2920 90 85
 
Std. Transport #
4912066