• USA Home
  • 8.40130 - 4-Hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl

8.40130 EMD Millipore


4-Hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (free radical) for synthesis. CAS 2226-96-2, pH 8.2 (20 g/l, H₂O, 20 °C)., (free radical) for synthesis

Synonym: 4-Hydroxy-TEMPO

  • CAS Number 2226-96-2

  • Linear Formula C₉H₁₈NO₂

  • Molecular Weight 172.25 g/mol

  •  EC Number 218-760-9



Related Categories Biochemicals and Reagents More...
packaging   25 g in Glass bottle (8401300025)
vapor pressure   <0.01 hPa (20 °C)
solubility   1670 g/l
flash point   146 °C DIN 51758
autoignition temp.   260 °C DIN 51794
mp   67 - 71 °C
pH   8.2 (20 g/l, H₂O, 20 °C)
LD 50 oral   LD50 Rat 1053 mg/kg
storage temp.   Store below +30°C.
specifications   Assay (GC, area%): ≥ 95.0 % (a/a)
  Melting range (lower value): ≥ 67 °C
  Melting range (upper value): ≤ 71 °C
  Identity (IR): passes test

Price and Availability

Ask us for bulk and customization needs

My Chemicals
Safety & Documentation

Safety Information

HS Code 
2933 39 99
Hazard Statement(s) 
H302: Harmful if swallowed.
H318: Causes serious eye damage.
Precautionary Statement(s) 
P280: Wear eye protection.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P313: Get medical advice/ attention.
Storage class 
10 - 13 Other liquids and solids
WGK 1 slightly water endangering
Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.
Hazard Pictogram(s) 
GHS05  GHS05
Hazard Pictogram(s) 
GHS07  GHS07
Hazard Symbols 
Harmful  Harmful
Categories of danger 
harmful, irritant
R Phrase 
R 22-41
Harmful if swallowed.Risk of serious damage to eyes.
S Phrase 
S 24-26-39
Avoid contact with skin.In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear eye/face protection.
Protocols & Articles
Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?