Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information
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4-Hydroxybenzoic acid methyl ester(99-76-3)

Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information

Product Identification

Product Name
4-Hydroxybenzoic acid methyl ester
Synonyms
4-Hydroxybenzoic acid methyl ester
Maseptol
Methyl 4-hydroxybenzoate
Methyl Butex
Methyl p-hydroxybenzoate
Preserval
CAS
99-76-3
Formula
C8H8O3
Molecular Weight
152.15
EINECS
202-785-7
RTECS
DH2450000
RTECS Class
Drug; Mutagen
Merck
12,6182
Beilstein/Gmelin
509801
Beilstein Reference
4-10-00-00360

Physical and Chemical Properties

Appearance
Solid.
Solubility in water
Slightly soluble
Melting Point
125 - 128
Boiling Point
270 - 280
Density
1.1208 g/cm3 (137 C)
pKa/pKb
8.30 (pKa)
Partition Coefficient
1.96
Heat Of Vaporization
77.10 kJ/mol
Heat Of Combustion
-3751 kJ/mol
Usage
Inhibitor of growth of molds & to lesser extent bacteria, as vehicle for ophthalmic soln., Preservative.
Refractive Index
1.5204 (137 C)

First Aid Measures

Ingestion
Do NOT induce vomiting. 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 if cough or other symptoms appear. DO NOT use mouth-to-mouth respiration.
Skin
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Handling and Storage

Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with skin and eyes. Keep container tightly closed. Avoid ingestion and inhalation.

Hazards Identification

Inhalation
May cause respiratory tract irritation.
Skin
May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material.
Eyes
May cause moderate eye irritation.
Ingestion
May cause irritation of the digestive tract.
Hazards
Dusts at sufficient concentrations can form explosive mixtures with air.
EC Risk Phrase
R 36/37/38
EC Safety Phrase
S 26 36
UN (DOT)
2769

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 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.
Exposure Effects
Repeated exposure may cause sensitization dermatitis.
Poison Class
5

Fire Fighting Measures

Autoignition
> 600
Fire Fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use water spray, dry chemical, or carbon dioxide.

Accidental Release Measures

Small spills/leaks
Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Wear a self contained breathing apparatus and appropriate Personal protection. (See Exposure Controls, Personal Protection section). Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong bases.
Decomposition
Carbon monoxide, carbon dioxide, acrid smoke and fumes.

Transport Information

UN Number
2769
HS Code
2918 29 30
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