Note: Ingredients listed on restricted chemical lists
EC/CAS
109-99-9
Name of the chemical
Tetrahydrofuran (618/2012)
Concentration
90%
General Information
Revision date
2026-06-29
Product name
Cap A (Acetic Anhydride in THF, 1:9)
Product Synonyms
Capping Solution
CAS No.
109-99-9
Emergency telephone
1-800-535-5053, 1-352-323-3500
Icons in SDS
Company Information
company name
Lab Alley, LLC
GHS Information
Signal word
Danger!
Hazard Codes
Hazard statements (CLP)
H225, H241, H302, H312, H314, H332
Hazard statements
Code
Statements
H225
Highly Flammable liquid and vapour
Section 2
SECTION 2: Hazards identification
Classification of the substance or mixture
Signal word
Danger!
Hazard statements
H225 – Highly flammable liquid and vapor. H241 – Heating may cause a fire or explosion. H302 – Harmful if swallowed. H312 – Harmful in contact with skin. H314 – Causes severe skin burns and eye damage. H332 – Harmful if inhaled.
Precautionary statements
P210 – Keep away from heat/sparks/open flames/hot surfaces. – No smoking. P280 – Wear protective gloves/protective clothing/eye protection/face protection. P284 – Wear respiratory protection. P301+P310 – If SWALLOWED: Immediately call or POISON CENTER or a doctor/physician. P303+P361+P353 – IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower. P304+P340 – IF INHALED: Remove person to fresh air and keep comfortable for breathing. P305+P351+P338 – IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P310 – Immediately call a POISON CENTER or doctor/ physician. P332+P313 – If skin irritation occurs: Get medical advice/ attention. P403+P233 – Store in a well-ventilated place. Keep container tightly closed. P405 – Store locked up. P501 – Dispose of contents/ container to an approved waste disposal plant.
2.3 Other hazards
May be fatal if swallowed, inhaled, or absorbed though the skin. Causes burns and severe irritation to eyes, skin, and respiratory tract. Readily absorbs though the skin. Affects cardiovascular system, central nervous system, liver, and kidneys. Highly flammable liquid and vapor. May form explosive peroxides. Hygroscopic. Flammable liquid and vapor (GHS Category 2) Warning. Cancer - https://www.p65warnings.ca.gov/
2.1 Classification of the substance or mixture
GHS Classification in accordance with 29 CFR 1910 (OSHA HCS) Flammable Liquids: GHS Category 2 Acute Toxicity, Inhalation: GHS Category 3 Acute Toxicity, Oral: GHS Category 4 Skin Corrosion: GHS Category 1B Serious Eye Damage: GHS Category 1 Specific Target Organ Exposure, single exposure: GHS Category 3, Respiratory System
