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Ethyl silicate																				Related Pages
Synonyms & Trade Names
			Ethyl orthosilicate, Ethyl silicate (condensed), Tetraethoxysilane, Tetraethyl orthosilicate, Tetraethyl silicate
CAS No.
			78-10-4
	RTECS No.
			VV9450000
	DOT ID & Guide
			1292 129

Formula(C2H5)4SiO4
	Conversion
			1 ppm = 8.52 mg/m3
	IDLH
			700 ppmSee: 78104

Exposure Limits
			NIOSH RELTWA 10 ppm (85 mg/m3)
					OSHA PEL TWA 100 ppm (850 mg/m3) See Appendix G
	Measurement Methods
			**NIOSH** S264 (II-3)
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless liquid with a sharp, alcohol-like odor.													
										
Molecular Weight208.3	
	Boiling Point336°F
	Freezing Point-117°F
	SolubilityReacts
	Vapor Pressure1 mmHg
	Ionization Potential9.77 eV											
Specific Gravity0.93	
	Flash Point99°F
	Upper Explosive Limit?
	Lower Explosive Limit?
Class IC Flammable Liquid: Fl.P. at or above 73°F and below 100°F.
Incompatibilities & Reactivities
			Strong oxidizers, water
					[Note: Reacts with water to form a silicone adhesive (a milky-white mass).]
Exposure Routes
			inhalation, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, nose; In Animals: lacrimation (discharge of tears); dyspnea (breathing difficulty), pulmonary edema; tremor, narcosis; liver, kidney damage; anemia
Target Organs
			Eyes, respiratory system, liver, kidneys, blood, skin
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet (flammable)
							**Change:**No recommendation
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap wash promptly
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH****Up to 100 ppm**: (APF = 10) Any supplied-air respirator***Up to 250 ppm**: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode***Up to 500 ppm**: (APF = 50) Any self-contained breathing apparatus with a full facepiece(APF = 50) Any supplied-air respirator with a full facepiece**Up to 700 ppm**: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode**Emergency or planned entry into unknown concentrations or IDLH conditions:** (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus**Escape:** (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canisterAny appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0333

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
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