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Methyl phenyl silicone oil IOTA 250-30, chemically known as polymethylphenylsiloxane, is a widely used organosilicon material in the industrial sector. The product appears as a colorless to pale yellow transparent liquid under standard conditions, offering good flowability that simplifies both storage and transportation. With a viscosity range of 25 to 40 CST measured at 25°C, it falls into the low-viscosity category of silicone oils. This characteristic makes it particularly well-suited for processes that require rapid penetration and uniform coating. Whether used as a base component in lubricant formulations or as an insulating medium in electrical equipment, IOTA 250-30 is designed to meet a variety of operational demands.
The refractive index of IOTA 250-30 at 25°C is between 1.4700 and 1.4800, a value that carries relevance in applications involving optical clarity and light transmission. The relative density at 25°C ranges from 1.010 to 1.080, placing it in a moderate density range that allows for good compatibility with a variety of organic solvents and base oils. The flash point, measured by the open cup method, is 240°C or higher — a figure that provides strong reassurance in high-temperature working environments where fire safety is a concern. The freezing point of the product reaches as low as -45°C, meaning it remains in liquid form even during harsh winter conditions, a feature that is particularly valuable for outdoor equipment and cold-chain-related industries.
The low viscosity of IOTA 250-30 gives it a clear advantage in applications where fast flow and even distribution are required. The low freezing point ensures consistent performance in cold climates, eliminating the risk of solidification due to seasonal temperature drops. Its thermal stability, combined with a high flash point, allows the product to maintain reliable performance under elevated temperatures. Additionally, the product features a small coefficient of thermal expansion, which means volume changes remain limited even when temperatures fluctuate significantly. This attribute supports the precision and sealing integrity of equipment that operates across a wide temperature range.
