Material Safety Data Sheet
TMAH, 25%
1. PRODUCT AND COMPANY IDENTIFICATION
PRODUCT NAME: TMAH, 25%
OTHER/GENERIC NAMES: Tetramethylammonium hydroxide, 25% (aqueous solution)
Methanaminium, N,N,N-trimethyl, hydroxide
PRODUCT USE: Electronics
MANUFACTURER: General Chemical Corporation
90 East Halsey Road
Parsippany, NJ 07054
FOR MORE INFORMATION CALL: IN CASE OF EMERGENCY CALL:
973-515-1840 800-631-8050
(Monday-Friday, 9:00am-4:30pm) (24 Hours/Day, 7 Days/Week)
2. COMPOSITION/INFORMATION ON INGREDIENTS
INGREDIENT NAME CAS NUMBER WEIGHT %
Tetramethylammonium hydroxide 75-59-2 25
Water 7732-18-5 75
Trace impurities and additional material names not listed above may appear in Section 15 of this MSDS. These
materials may be listed for local "Right-To-Know" compliance and for other reasons.
OSHA Hazard Communication Standard: This product is considered hazardous under the OSHA Hazard
Communication Standard.
3. HAZARDS IDENTIFICATION
EMERGENCY OVERVIEW: A colorless to yellow liquid with an amine-like odor. Highly
corrosive. Causes burns to skin and eyes. May be fatal if swallowed, inhaled, or absorbed
through the skin or eyes.
POTENTIAL HEALTH HAZARDS
SKIN: Very corrosive to skin and will cause alkali burns. The severity and extent of damage increases with the
length of contact time. May be fatal following dermal exposure.
EYES: Very corrosive and destructive on contact with eyes causing serious alkali burns. Exposure to a very
small amount of mist or spray will cause irritation. Symptoms may include blurred or double vision,
pinpoint pupils. May be fatal following eye exposure.
INHALATION: Very corrosive to the respiratory tract, causing alkali burns if mist or spray is inhaled.
Inhalation of very small amounts of mist or spray will cause irritation. Symptoms may include
muscle twitching, tremors or convulsions. The severity and extent of damage increases with
the increase in mist or spray exposure and is potentially fatal.
MSDS Number: GC-6116 Page 1 of 6
Current Issue Date: October, 2001
MATERIAL SAFETY DATA SHEET
TMAH, 25%
INGESTION: Very corrosive and will cause serious alkali burns to the mucous membranes of the mouth,
throat, esophagus and stomach. Symptoms may include abdominal cramping, nausea and
vomiting, diarrhea. May be fatal following ingestion.
DELAYED EFFECTS: None known.
Ingredients found on one of the three OSHA designated carcinogen lists are listed below.
INGREDIENT NAME NTP STATUS IARC STATUS OSHA LIST
No ingredients listed in this section.
4. FIRST AID MEASURES
SKIN: Immediately flush with water with sufficient volume until there is no evidence of the chemical on the affected
area. Remove contaminated clothing and wash before reuse. Get medical attention immediately.
EYES: Immediately flush with water for at least 15-20 minutes until no evidence of chemical remains. While
flushing, forcibly hold the eyelids apart to ensure flushing of the entire eye surface. Get immediate medical
attention.
INHALATION: Remove to fresh air. If breathing has stopped, give artificial respiration taking care to avoid contact
with this product. Get medical attention.
INGESTION: Do not induce vomiting. If person is conscious and able to swallow, have victim drink a large
volume of water and milk. Get medical attention immediately.
ADVICE TO PHYSICIAN: Treat symptomatically.
5. FIRE FIGHTING MEASURES
FLAMMABLE PROPERTIES
FLASH POINT: >200F
FLASH POINT METHOD: Closed Cup
AUTOIGNITION TEMPERATURE: Not determined
UPPER FLAME LIMIT (volume % in air): Not applicable
LOWER FLAME LIMIT (volume % in air): Not applicable
FLAME PROPAGATION RATE (solids): Not applicable
OSHA FLAMMABILITY CLASS: Not flammable
EXTINGUISHING MEDIA:
Water spray, carbon dioxide, dry chemical or chemical foam.
UNUSUAL FIRE AND EXPLOSION HAZARDS:
None.
SPECIAL FIRE FIGHTING PRECAUTIONS/INSTRUCTIONS:
Wear self-contained breathing apparatus and full protective gear. Do not splash onto skin, eyes or clothing. Do
not breathe corrosive mists, sprays or vapors.
MSDS Number: GC-6116 Page 2 of 6
Current Issue Date: October, 2001
MATERIAL SAFETY DATA SHEET
TMAH, 25%
6. ACCIDENTAL RELEASE MEASURES
IN CASE OF SPILL OR OTHER RELEASE: (See section 8 for recommended personal protective equipment.)
Contain spill. If safety allows, stop flow at the source. Prevent contact with skin and clothing. Avoid routing of
material to water bodies or streams. Take up with absorbent material and place in containers for disposal.
Spills and releases may have to be reported to Federal and/or local authorities. See Section 15 regarding
reporting requirements.
7. HANDLING AND STORAGE
NORMAL HANDLING: (See section 8 for recommended personal protective equipment.)
Do not get into eyes, on skin or on clothing. Do not breathe mist or spray. Wash all contaminated clothing before
reuse. Keep the container tightly closed (readily absorbs carbon dioxide from the air). Do not eat or drink while
handling. Wash thoroughly after handling.
STORAGE RECOMMENDATIONS:
Store in a cool, dry, well-ventilated area. Avoid high temperatures. Material should be stored in plastic or stainless
steel. Store away from incompatible materials.
8. EXPOSURE CONTROLS/PERSONAL PROTECTION
ENGINEERING CONTROLS:
Provide local exhaust.
PERSONAL PROTECTIVE EQUIPMENT
SKIN PROTECTION: Wear rubber gloves and protective clothing to prevent skin contact.
EYE PROTECTION: Faceshield and goggles.
RESPIRATORY Mist type respirator if mists are present.
PROTECTION:
ADDITIONAL Eyewash and safety shower.
RECOMMENDATIONS:
EXPOSURE GUIDELINES
INGREDIENT NAME ACGIH TLV OSHA PEL OTHER LIMIT
No ingredients listed in this section.
1
= Limit established by General Chemical Corporation.
2
= Workplace Environmental Exposure Level (AIHA).
3
= Biological Exposure Index (ACGIH).
OTHER EXPOSURE LIMITS FOR POTENTIAL DECOMPOSITION PRODUCTS:
None.
MSDS Number: GC-6116 Page 3 of 6
Current Issue Date: October, 2001
MATERIAL SAFETY DATA SHEET
TMAH, 25%
9. PHYSICAL AND CHEMICAL PROPERTIES
APPEARANCE: Colorless to light yellow solution.
PHYSICAL STATE: Liquid.
MOLECULAR WEIGHT: Mixture.
CHEMICAL FORMULA: Mixture.
ODOR: Amine
SPECIFIC GRAVITY (water = 1.0): 1.014 @ 20C
SOLUBILITY IN WATER (weight %): Miscible.
pH: >13
BOILING POINT: Approx. 102C
MELTING POINT: Not applicable
VAPOR PRESSURE: Not determined.
VAPOR DENSITY (air = 1.0): Not determined.
EVAPORATION RATE: COMPARED TO:
Not determined.
% VOLATILES: Not determined.
FLASH POINT: >200F
(Flash point method and additional flammability data are found in Section 5.)
10. STABILITY AND REACTIVITY
NORMALLY STABLE? (CONDITIONS TO AVOID):
Stable under normal conditions.
INCOMPATIBILITIES:
Strong acids. Oxidizers should be tested for compatibility before use. Boiling temperatures should be avoided.
HAZARDOUS DECOMPOSITION PRODUCTS:
Trimethylamine and methanol produced during decomposition.
In fire conditions: carbon monoxide and nitrogen oxides.
HAZARDOUS POLYMERIZATION:
Will not occur.
11. TOXICOLOGICAL INFORMATION
IMMEDIATE (ACUTE) EFFECTS:
LDLo (subcutaneous-mouse): 19 mg/kg
LD50 (skin-guinea pig): 25 mg/kg
DELAYED (SUBCHRONIC AND CHRONIC) EFFECTS:
Data not available.
OTHER DATA:
None.
MSDS Number: GC-6116 Page 4 of 6
Current Issue Date: October, 2001
MATERIAL SAFETY DATA SHEET
TMAH, 25%
12. ECOLOGICAL INFORMATION
If neutralized, this material may be biodegradable. No specific information available. Acute aquatic testing on a pH
neutralized solution of this compound has been shown to be highly toxic to the ceriodaphnia dubia (water flea).
13. DISPOSAL CONSIDERATIONS
RCRA
Is the unused product a RCRA hazardous If yes, the RCRA ID number is: D002
waste if discarded? Yes
OTHER DISPOSAL CONSIDERATIONS:
The information offered in section 13 is for the product as shipped. Use and/or alterations to the product such as
mixing with other materials may significantly change the characteristics of the material and alter the RCRA
classification and the proper disposal method.
14. TRANSPORT INFORMATION
US DOT HAZARD CLASS: 8, PG II
US DOT ID NUMBER: UN1835
PROPER SHIPPING NAME: Tetramethylammonium hydroxide, solution
For additional information on shipping regulations affecting this material, contact the information number found in
Section 1.
15. REGULATORY INFORMATION
TOXIC SUBSTANCES CONTROL ACT (TSCA)
TSCA INVENTORY STATUS: Components are listed on the TSCA inventory.
OTHER TSCA ISSUES: None
SARA TITLE III/CERCLA
"Reportable Quantities" (RQs) and/or "Threshold Planning Quantities" (TPQs) exist for the following ingredients.
INGREDIENT NAME SARA/CERCLA RQ (lb) SARA EHS TPQ (lb)
No ingredients listed in this section.
Spills or releases resulting in the loss of any ingredient at or above its RQ requires immediate notification
to the National Response Center [(800) 424-8802] and to your Local Emergency Planning Committee.
SECTION 311 HAZARD CLASS: Immediate
SARA 313 TOXIC CHEMICALS:
MSDS Number: GC-6116 Page 5 of 6
Current Issue Date: October, 2001
MATERIAL SAFETY DATA SHEET
TMAH, 25%
The following ingredients are SARA 313 "Toxic Chemicals" and may be subject to annual reporting requirements.
CAS numbers and weight percents are found in Section 2.
INGREDIENT NAME COMMENT
No ingredients listed in this section.
STATE RIGHT-TO-KNOW
In addition to the ingredients found in Section 2, the following are listed for state right-to-know purposes.
INGREDIENT NAME WEIGHT % COMMENT
No ingredients listed in this section.
ADDITIONAL REGULATORY INFORMATION:
None.
WHMIS CLASSIFICATION (CANADA):
Not determined.
FOREIGN CHEMICAL CONTROL INVENTORY STATUS:
Listed on Canadian DSL and EU EINECS.
16. OTHER INFORMATION
CURRENT ISSUE DATE: October, 2001
PREVIOUS ISSUE DATE: Not applicable
CHANGES TO MSDS FROM PREVIOUS ISSUE DATE ARE DUE TO THE FOLLOWING:
Not applicable
OTHER INFORMATION: None
MSDS Number: GC-6116 Page 6 of 6
Current Issue Date: October, 2001
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