4-Hydroxy-TEMPO or TEMPOL,is a heterocyclic compound. It is used as a catalyst and chemical oxidant by virtue of being a stable aminoxyl radical. It has a good solubility in water.The use of 4-Hydroxy TEMPO/polymerization inhibitor 701 has significant advantages when it is combined with appropriate metal ion passivators and dispersants, to prepare a composite scale inhibitor for petrochemical process water.
Overview
Product Name: 4-Hydroxy TEMPO
Synonym: Inhibitor 701, 4-Hydroxy-2,2,6,6-tetramethyl piperidine nitro-oxides,
TEMPOL, 4-Hydroxy -2,2,6,6-Tetramethyl Piperidine, 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl, 4-Oxypiperidol
CAS No.: 2226-96-2
EINECS No.: 218-760-9
Molecular Formula: C9H18NO2
Molecular Weight: 172.24
Item | Specification |
Appearance | Dark Orange flakes |
Ethanol solubility | Clear |
Assay(GC) | ≥99.00% |
Water | ≤0.50% |
Ash | ≤0.10% |
Melting point | 69.0-72.0ºC |
25kg/bag, 25kg/fiber drum, 20kg/carton box.


4-Hydroxy TEMPO is free radical inhibitor.It has good inhibition effect in aerobic and anaerobic environment.
4-Hydroxy TEMPO is used to prevent the self-polymerization of olefin monomers during production, separation, refining, storage or transportation.
And it controls and adjusts the degree of polymerization of olefins and their derivatives in organic synthesis reactions.
It has inhibition effect for acrylates, methacrylates, styrene, butadiene.
Name | CAS NO. | Melting point | Uses |
polymerization inhibitor 701 | 2226-96-2 | 69~72 | Used to prevent self polymerization of olefin monomers during production, separation, refining, storage, or transportation, and to control and regulate the degree of polymerization of olefins and their derivatives in organic synthesis reactions. |
polymerization inhibitor 702 | 2896-70-0 | 28~32 | It has a good inhibitory effect on acrylic ester, methacrylate, styrene, butadiene, and its inhibitory performance is better than that of phenolic, aromatic amine, ether, quinone, and nitro compounds. |
polymerization inhibitor 705 | 2122-49-8 | ≥125 | A new and efficient inhibitor for unsaturated compounds such as olefin monomers, acrylic esters, methacrylates, styrene, butadiene, unsaturated polyesters, and pesticides. |
polymerization inhibitor 706 | 2516-92-9 | 99~103 | It has good resistance to polymerization of acrylic esters, methacrylate, styrene, butadiene. |
Advantage of 4-Hydroxy TEMPO
4-Hydroxy TEMPO is an efficient, clean and environmentally friendly inhibitor.
It is convenient for feeding and cleaning. 4-Hydroxy TEMPO has good solubility
It is not only soluble in various organic solvents, but also in water. After using 4-Hydroxy TEMPO, the polymer residue in the tray and pipeline of the device becomes granular, brittle, and easy to clean. It saves cleaning costs for customers significantly.
4-Hydroxy TEMPO has a good inhibitory effect for the self polymerization of olefin substances and their derivatives during production, separation, refining, storage and transportation.
Jinan Huashihang Chemical Co., Ltd is its sales company with import and export authority. The company was founded in 2004, located in Jinan City, Shandong, China. It started from a small village collective factory, but has now developed into a large private enterprise group with a complete industrial chain.
Being focused on the research, development, production, trade and service of chemicals, Hushihang chemical is a specialized manufacturer and supplier of fine chemicals, cosmetic materials, daily chemicals and food additives.
The company has established a documented system consisting of manual, procedures and instructions, based on the requirements of ISO 9001:2008. The quality policy has been established, understood and maintained. Products are inspected to ensure their suitability to the requirements, and released for delivery only after checking the fulfillment of all specified requirements.
Huashihang Chemical has a professional procurement team, QA team, and warehouse workers. Now the products have exported to North America, Latin America, Asia, Europe, North Africa and Australia.
With years' of experience and excellent market knowledge, Huashihang Chemical is the most-chosen supplier of Chinese chemicals to brands worldwide. We can guarantee the best solution to our customers. We will work with you to make life better.



Q1: Could you offer sample?
A1: Yes,sample is available. We can send samples by couriers or air as client's requirements.
Q2: What is MOQ?
A2: It usually does not have MOQ requirement. We will offer the most cost-effective solution including price and delivery way according to purchasing quantities.
Q3: What is the delivery time?
A3: For non-hazardous,it usually has stock. It can be sent within 7 days. For hazardous chemical,it may be 1~2 weeks. If it is our regular product, the time will be earlier.
Q4: Can you provide relevant documents?
A4: Of course. Bill of loading,Commercial Invoice, Packing List, Origin of Certificate , insurance, COA and SDS are available. Besides, we can offer other documents Certificate of Fumigation, documents approved by CCPIT or Consulate,etc.
Q5: Do you accept third party inspection?
A5: Yes,we do.
Q6: What is your payment term?
A6: TT,LC,Paypal,Western Union, ACH wire are available.
Q7: Is DDU or DDP available?
A7: Yes.
Q8: Could you look for other products on China market and coload one container?
A8: Yes. We have warehouse support to accomplish this.