TCI H0186 Hydroquinone is a diphenolic compound bearing two hydroxyl groups in the para position, widely recognised as a polymerisation inhibitor and antioxidant in materials chemistry laboratories. Its most prominent role is in the handling of vinylic monomers such as acrylates, methacrylates, and styrene, where it prevents premature polymerisation during storage, distillation, and general material handling. By scavenging the free radicals that initiate chain reactions, hydroquinone keeps monomers in a ready-to-use condition. Beyond this, the compound also serves as a classical reducing agent in analytical chemistry and was once a staple ingredient of photographic developers, making its name highly familiar across a wide range of laboratories.
The property that makes hydroquinone a preferred choice is its reversible redox behaviour between the hydroquinone and quinone forms, which allows it to quench free radicals very effectively even at low concentrations. The compound is supplied as a white crystalline solid that dissolves readily in hot water, ethanol, and ether, giving it considerable flexibility across both aqueous and organic systems. This solubility profile means a single inhibitor can be carried into formulations of very different polarity without reformulation. It should be noted that hydroquinone tends to darken on exposure to air and light as a result of surface oxidation, and this behaviour is an expected characteristic of the material rather than a defect.
In Indonesian laboratories, TCI H0186 is typically found wherever monomers are stored, purified, or redistilled before use — polymer research groups at universities, materials science laboratories, and coatings or adhesives development units. It is also kept on hand in analytical laboratories that rely on classical reduction chemistry. Because monomer stocks are often held for extended periods before a synthesis campaign begins, a dependable inhibitor of this kind is a routine part of the chemical inventory rather than an occasional special order.
- Monomer stabilisation during storage: added to acrylate, methacrylate, and styrene stocks so that radical chain initiation is suppressed and the monomer remains usable over an extended holding period.
- Inhibition during distillation and purification: protects vinylic monomers from premature polymerisation while they are heated, a stage where thermally generated radicals would otherwise cause runaway reaction in the still.
- Controlled polymerisation studies: introduced at known low levels to moderate or quench radical propagation, allowing researchers to study induction periods and reaction kinetics under reproducible conditions.
- Antioxidant additive in formulation work: its reversible hydroquinone–quinone redox couple intercepts oxidative radicals, helping preserve oxidation-sensitive organic preparations during compounding, testing, and interim storage.
- Classical reducing agent in analytical chemistry: used in redox procedures where a well-characterised organic reductant is required, drawing on the same electron-donating chemistry that made it a photographic developer component.
| Brand | TCI |
|---|---|
| CAS number | 123-31-9 |
| Molecular formula | — |
| Purity | — |
| Category | Materials Science > Polymer/Macromolecule Reagents > Polymerization Inhibitors |
| Pack sizes | available in standard TCI catalogue pack sizes; please confirm the size required when ordering. |
| Physical form | white crystalline solid, soluble in hot water, ethanol, and ether. |
| Storage | keep protected from air and light, as surface oxidation causes progressive darkening of the solid. |
Store TCI H0186 Hydroquinone in a tightly closed container in a cool, dry, well-ventilated area, away from direct sunlight and sources of heat. Amber glass or other opaque, chemically resistant containers are preferred, since exposure to air and light drives the surface oxidation that darkens the solid over time. Keep the container sealed between uses and minimise headspace where practical. Handle the material in a fume hood using gloves, safety goggles, and a laboratory coat, and avoid generating or inhaling dust when weighing out the crystalline solid. Keep it separated from strong oxidising agents, and follow the manufacturer's safety data sheet together with your institution's chemical waste procedures for disposal.
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