At NINGBO INNO PHARMCHEM CO.,LTD., we are committed to providing in-depth understanding of the chemical compounds we offer. Antimony Trioxide (ATO), identified by CAS 1309-64-4, is a prime example of a chemical auxiliary that plays a vital role in enhancing material safety through its unique flame retardant properties. Its effectiveness is largely attributed to its role as a synergist, working in conjunction with halogenated compounds to create a robust fire-resistant system.

The flame retardant action of antimony trioxide is a complex interplay of physical and chemical processes. When a material containing ATO and a halogenated compound catches fire, the combined system initiates a multi-pronged defense. Initially, ATO melts at 655°C, forming a protective film on the material's surface. This film helps to isolate the material from the surrounding oxygen, a critical element for combustion. Simultaneously, ATO can participate in endothermic reactions, absorbing heat and further reducing the material's temperature.

The more significant contribution comes from its synergistic interaction with halogens. In the gas phase, antimony trioxide reacts with halogens released from the co-existing halogenated flame retardants. This reaction produces antimony halides, which are highly effective in interfering with the combustion cycle. These halides act as radical scavengers, specifically targeting and neutralizing the highly reactive free radicals (such as H• and OH•) that sustain the flame. By trapping these radicals, the chain reactions that propagate fire are disrupted, leading to flame extinguishment or significant suppression. This gas-phase inhibition is a cornerstone of its utility.

In addition to gas-phase mechanisms, antimony trioxide also influences the solid phase. It promotes the formation of a stable char layer. This char, a carbonaceous residue, acts as a barrier against heat transfer and oxygen diffusion, further protecting the underlying material. The quality and stability of this char layer are often enhanced by the presence of ATO, making it an indispensable component in intumescent flame retardant systems, where char formation is paramount.

The industrial grade of antimony trioxide is particularly valued for its high purity (often exceeding 99.8%) and its ability to be produced with specific particle sizes tailored to different polymer matrices. This control over physical properties ensures optimal dispersion and maximum synergistic effect. Whether used as a clarifier in glass making or as a pigment in paints, the inherent chemical stability and reactivity profile of ATO make it a versatile industrial chemical.

The demand for antimony trioxide continues to grow, driven by stricter fire safety regulations across various sectors. Its ability to provide high flame retardant efficiency at relatively low loadings, coupled with its synergistic capability, makes it a cost-effective solution for manufacturers. NINGBO INNO PHARMCHEM CO.,LTD. is proud to supply this essential industrial grade chemical, supporting advancements in material science and safety engineering.