4-Hydroxy-TEMPO, scientifically known as 4-hydroxy-2,2,6,6-tetramethylpiperidinoxyl (CAS 2226-96-2), is a fascinating and highly versatile chemical compound that finds application in numerous industrial and research sectors. Its unique molecular structure, featuring a stable nitroxyl radical, endows it with remarkable properties, making it a valuable asset for scientists and manufacturers alike. Understanding these properties is key to leveraging its full potential.

From a chemical perspective, 4-Hydroxy-TEMPO typically presents as an orange to orange-red crystalline powder with a melting point in the range of 68-72°C. What sets it apart is its free radical nature, which underpins its effectiveness as a polymerization inhibitor and an antioxidant. Unlike many conventional inhibitors, it exhibits good performance under both oxygen-present and oxygen-absent conditions, making it highly reliable in diverse manufacturing environments. Its solubility in water and common polar organic solvents further enhances its ease of use in various formulations.

The applications of 4-Hydroxy-TEMPO are extensive. As a polymerization inhibitor, it is highly effective in preventing the spontaneous polymerization of monomers such as acrylates, methacrylates, styrene, and butadiene. This property is critical for ensuring the stability and safe handling of these reactive chemicals during production, storage, and transportation. When considering where to purchase such a specialized chemical, engaging with a reputable manufacturer and supplier, particularly from China, ensures access to high-purity material and technical support.

Beyond its role in monomer stabilization, 4-Hydroxy-TEMPO is increasingly recognized for its utility in wood coatings. It acts as a potent photo-stabilizing additive, protecting wood surfaces from UV-induced degradation, such as graying and yellowing. Furthermore, it serves as a crucial chemical intermediate in the synthesis of Hindered Amine Light Stabilizers (HALS), which are vital for protecting polymers from photodegradation. For R&D scientists and procurement managers seeking advanced material solutions, understanding the scientific underpinnings and application breadth of 4-Hydroxy-TEMPO is essential for making informed purchasing decisions.