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MSDS 
:
 Methacrylic acid, 99.5% (stabilized with ca 250 ppm MEHQ)
CAS 
:
 79-41-4
SYNONYMS 
:
 2-Methylpropenoic acid; 2-Methyl-2-propenoic acid.
**** SECTION 2 - COMPOSITION, INFORMATION ON INGREDIENTS ****

+----------------+--------------------------------------+----------+-----------+
| CAS# | Chemical Name | % | EINECS# |
|----------------|--------------------------------------|----------|-----------|
|----------------|--------------------------------------|----------|-----------|
| 79-41-4 |Methacrylic acid | 99.5 | 201-204-4 |
|----------------|--------------------------------------|----------|-----------|
| 150-76-5 |Hydroquinone methyl ether | 0.025 | 205-769-8 |
+----------------+--------------------------------------+----------+-----------+
Text for R-phrases: see Section 16
Hazard Symbols: C
Risk Phrases: 21/22 35

**** SECTION 3 - HAZARDS IDENTIFICATION ****

EMERGENCY OVERVIEW
Harmful in contact with skin and if swallowed. Causes severe burns.

Potential Health Effects
Eye:
Causes eye burns.
Skin:
Harmful if absorbed through the skin. Causes skin burns.
Ingestion:
May cause burns to the digestive tract. May be harmful if swallowed.
Inhalation:
Causes chemical burns to the respiratory tract.
Chronic:
No information found.

**** SECTION 4 - FIRST AID MEASURES ****

Eyes:
In case of contact, immediately flush eyes with plenty of water for
at least 15 minutes. Get medical aid immediately.
Skin:
In case of contact, immediately flush skin with plenty of water for
at least 15 minutes while removing contaminated clothing and shoes.
Get medical aid immediately. Wash clothing before reuse.
Ingestion:
If swallowed, do NOT induce vomiting. Get medical aid immediately.
If victim is fully conscious, give a cupful of water. Never give
anything by mouth to an unconscious person.
Inhalation:
If inhaled, remove to fresh air. If not breathing, give artificial
respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician:

**** SECTION 5 - FIRE FIGHTING MEASURES ****

General Information:
As in any fire, wear a self-contained breathing apparatus in
pressure-demand, MSHA/NIOSH (approved or equivalent), and full
protective gear. Use water spray to keep fire-exposed containers
cool. Containers may explode when heated. Combustible liquid and
vapor.
Extinguishing Media:
Use water spray, dry chemical, carbon dioxide, or alcohol-resistant
foam.

**** SECTION 6 - ACCIDENTAL RELEASE MEASURES ****

General Information: Use proper personal protective equipment as indicated
in Section 8.
Spills/Leaks:
Absorb spill with inert material (e.g. vermiculite, sand or earth),
then place in suitable container. Remove all sources of ignition.
Provide ventilation.

**** SECTION 7 - HANDLING and STORAGE ****

Handling:
Wash thoroughly after handling. Remove contaminated clothing and
wash before reuse. Do not get in eyes, on skin, or on clothing. Empty
containers retain product residue, (liquid and/or vapor), and can be
dangerous. Keep container tightly closed. Do not ingest or inhale.
Do not pressurize, cut, weld, braze, solder, drill, grind, or expose
empty containers to heat, sparks or open flames. Use only with
adequate ventilation. Keep away from heat and flame. Pure vapor will
be uninhibited and may polymerize in vents or other confined spaces.
Storage:
Keep away from sources of ignition. Store in a tightly closed
container. Store in a cool, dry, well-ventilated area away from
incompatible substances. Store at around 20C. Do NOT freeze.

**** SECTION 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION ****

Engineering Controls:
Facilities storing or utilizing this material should be equipped
with an eyewash facility and a safety shower. Use adequate general or
local exhaust ventilation to keep airborne concentrations below the
permissible exposure limits.
Exposure Limits
CAS# 79-41-4:
United Kingdom, WEL - TWA: 20 ppm TWA; 72 mg/m3 TWA
United Kingdom, WEL - STEL: 40 ppm STEL; 143 mg/m3 STEL

Belgium - TWA: 20 ppm VLE; 71 mg/m3 VLE
France - VME: 20 ppm VME; 70 mg/m3 VME
Malaysia: 20 ppm TWA; 70 mg/m3 TWA
Netherlands: 20 ppm MAC; 70 mg/m3 MAC
Russia: 10 mg/m3 TWA
Spain: 20 ppm VLA-ED; 72 mg/m3 VLA-ED
CAS# 150-76-5:

Belgium - TWA: 5 mg/m3 VLE
France - VME: 5 mg/m3 VME
Germany: 5 mg/m3 TWA
Malaysia: 5 mg/m3 TWA
Netherlands: 5 mg/m3 MAC
Spain: 5 mg/m3 VLA-ED

Personal Protective Equipment

Eyes:
Wear chemical splash goggles.
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 29
CFR 1910.134 or European Standard EN 149. Use a
NIOSH/MSHA or European Standard EN 149 approved
respirator if exposure limits are exceeded or if
irritation or other symptoms are experienced.

**** SECTION 9 - PHYSICAL AND CHEMICAL PROPERTIES ****

Physical State: Liquid above room te
Color: colorless
Odor: repulsive
pH: Not available.
Vapor Pressure: .975 mm Hg @ 25 deg C
Viscosity: 1.4 mPas 20 deg C
Boiling Point: 163 deg C @ 760 mm Hg
Freezing/Melting Point: 16 deg C
Autoignition Temperature: 365 deg C ( 689.00 deg F)
Flash Point: 76 deg C ( 168.80 deg F)
Explosion Limits, lower: 1.60 vol %
Explosion Limits, upper: 8.80 vol %
Decomposition Temperature:
Solubility in water: Soluble.
Specific Gravity/Density: 1.0100 g/cm3
Molecular Formula: C4H6O2
Molecular Weight: 86.09

**** SECTION 10 - STABILITY AND REACTIVITY ****

Chemical Stability:
Stable only if stored and handled under recommended conditions. The
stability of the product depends upon the availability of both
dissolved oxygen and MEHQ inhibitor(CAS=150-76-5). The presence of
oxygen is necessary for the MEHQ to function effectively. The
product should never be stored under an inert gas atmosphere, but
should always be stored under an atmosphere containing 5-21% oxygen
by volume.
Conditions to Avoid:
Ignition sources, excess heat, do not freeze, loss of inhibitor.
Incompatibilities with Other Materials:
Strong oxidizing agents, hydrochloric acid
Hazardous Decomposition Products:
Carbon monoxide, carbon dioxide.
Hazardous Polymerization: May occur.

**** SECTION 11 - TOXICOLOGICAL INFORMATION ****

RTECS#:
CAS# 79-41-4: OZ2975000
CAS# 150-76-5: SL7700000
LD50/LC50:
CAS# 79-41-4: Dermal, guinea pig: LD50 = 1 gm/kg; Oral, mouse: LD50
= 1250 mg/kg; Oral, rabbit: LD50 = 1200 mg/kg; Oral, rat: LD50 =
1060 mg/kg; Skin, rabbit: LD50 = 500 mg/kg.
CAS# 150-76-5: Draize test, rabbit, skin: 6 gm/12D (Intermittent)
Mild; Draize test, rabbit, skin: 10%; Oral, rat: LD50 = 1600 mg/kg.
Carcinogenicity:
Methacrylic acid -
Not listed by ACGIH, IARC, or NTP.
Hydroquinone methyl ether -
Not listed by ACGIH, IARC, or NTP.
Other:
See actual entry in RTECS for complete information.

**** SECTION 12 - ECOLOGICAL INFORMATION ****



**** SECTION 13 - DISPOSAL CONSIDERATIONS ****

Dispose of in a manner consistent with federal, state, and local regulations.

**** SECTION 14 - TRANSPORT INFORMATION ****

IATA
Shipping Name: METHACRYLIC ACID, INHIBITED
Hazard Class: 8
UN Number: 2531
Packing Group: II
IMO
Shipping Name: METHACRYLIC ACID, INHIBITED
Hazard Class: 8
UN Number: 2531
Packing Group: II
RID/ADR
Shipping Name: METHACRYLIC ACID, INHIBITED
Hazard Class: 8
UN Number: 2531
Packing group: III

**** SECTION 15 - REGULATORY INFORMATION ****

European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: C
Risk Phrases:
R 21/22 Harmful in contact with skin and if
swallowed.
R 35 Causes severe burns.
Safety Phrases:
S 26 In case of contact with eyes, rinse immediately
with plenty of water and seek medical advice.
S 36/37/39 Wear suitable protective clothing, gloves
and eye/face protection.
S 45 In case of accident or if you feel unwell, seek
medical advice immediately (show the label where
possible).
WGK (Water Danger/Protection)
CAS# 79-41-4: 1
CAS# 150-76-5: 1
Canada
CAS# 79-41-4 is listed on Canada's DSL List.
CAS# 150-76-5 is listed on Canada's DSL List.
CAS# 79-41-4 is listed on Canada's Ingredient Disclosure List.
CAS# 150-76-5 is listed on Canada's Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 79-41-4 is listed on the TSCA inventory.
CAS# 150-76-5 is listed on the TSCA inventory.

**** SECTION 16 - ADDITIONAL INFORMATION ****

Text for R-phrases from Section 2
MSDS Creation Date: 12/31/1997 Revision #5 Date: 5/31/2005

The information above is believed to be accurate and represents the best
information currently available to us. However, we make no warranty of
merchantability or any other warranty, express or implied, with respect to
such information, and we assume no liability resulting from its use. Users
should make their own investigations to determine the suitability of the
information for their particular purposes. In no way shall the company be
liable for any claims, losses, or damages of any third party or for lost
profits or any special, indirect, incidental, consequential or exemplary
damages, howsoever arising, even if the company has been advised of
the possibility of such damages.
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