As an important precursor of phenyl silicone materials, octaphenylcyclotetrasiloxane (IOTA AKT) has maintained stable supply in the synthesis of high-temperature resistant silicone oils, special silicone resins and functional polymers for many years, relying on its high purity and stable cyclic structure, making it one of the important intermediates in the field of organosilicon fine chemicals.
IOTA AKT (chemical name: Octaphenylcyclotetrasiloxane, CAS: 546-56-5) has a molecular formula of C₄₈H₄₀O₄Si₄, with a typical cyclotetrasiloxane skeleton, and each of the four silicon atoms is connected to two phenyl groups. Its main physical and chemical properties are as follows:
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Appearance: White powdery crystal
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Purity ≥ 99.0%
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Melting point range: 160–205 °C
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Boiling point: 334 °C
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Flash point: 200 °C
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Insoluble in water, soluble in common organic solvents such as toluene, chloroform, tetrahydrofuran, etc.
Due to its highly phenylated structure, IOTA AKT can effectively introduce phenyl units in ring-opening polymerization or copolymerization reactions, significantly improving the thermal stability, refractive index and oxidation resistance of the resulting polymers. Therefore, this product is widely used in the preparation of:
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High phenyl content silicone oils (such as low-temperature resistant or radiation resistant types)
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High-temperature resistant silicone resins and packaging materials
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Optical grade organosilicon monomers
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Synthetic intermediates for special elastomers and crosslinking agents
According to feedback from many organosilicon material manufacturers, the high purity and good batch consistency of IOTA AKT help reduce side reactions and improve polymerization efficiency, and perform reliably in both laboratory research and development and pilot-scale amplification stages.
The manufacturer stated that the product has established mature crystallization and purification processes, can provide Certificate of Analysis (CoA) and safety technical data on demand, and complies with conventional chemical transportation and storage standards. Currently, IOTA AKT supports flexible supply from 100-gram R&D samples to ton-level industrial procurement.
With the steady growth in demand for high-performance phenyl silicone polymers in high-end electronics, aerospace and optical materials, IOTA AKT, as a key building block, continues to provide basic support for downstream innovation.
Note: IOTA AKT is a basic organosilicon intermediate that has been commercialized for many years, mainly used for synthetic purposes, not end-use products. It is suitable for R&D and production scenarios of polymer materials requiring high phenyl introduction.
