As a mature and stable polymethylphenylsiloxane product, the low-viscosity methylphenyl silicone oil IOTA 250-30 has maintained reliable application in fields with high requirements for material stability such as power electronics, instrumentation and temperature control systems for many years, relying on its low viscosity, low pour point and excellent electrical properties.
The typical technical indicators of IOTA 250-30 are as follows:
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Appearance: Colorless to pale yellow transparent liquid
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Kinematic viscosity at 25℃: 25–40 cSt
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Pour point: ≤ –45 °C
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Flash point (open cup): ≥ 240 °C
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Relative density (25℃): 1.010–1.080
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Refractive index (25℃): 1.4700–1.4800
This product combines the fluidity of methyl silicone oil and the thermal stability of phenyl silicone oil, with a small volume expansion coefficient and gentle viscosity change in a wide temperature range. At the same time, its good electrical properties—including high breakdown voltage and corona resistance—make it particularly suitable for electrical environments that require long-term insulation or heat dissipation.
Currently, IOTA 250-30 has been routinely used in the following scenarios:
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Impregnation and filling medium for high-voltage transformers, capacitors and reactors
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Damping and shockproof fluid for precision sensors and instruments
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Heat transfer or buffer medium in alternating temperature environments
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Insulation protection for small motors and relays
According to feedback from some power equipment manufacturers, in the low-temperature startup test at –40 °C, IOTA 250-30 did not experience a sudden drop in fluidity or precipitation, ensuring the reliability of equipment in alpine regions or outdoor working conditions.
The manufacturer stated that the product has established a stable synthesis and refining process with good batch consistency, supporting regular industrial procurement and small-batch trials, and complying with relevant environmental protection requirements of RoHS and REACH.
With the normalization of demand for high-performance insulating fluids in smart grids, new energy equipment and high-reliability electronic components, methylphenyl silicone oils such as IOTA 250-30 that balance low-temperature performance and electrical characteristics are becoming one of the practical options in engineering selection.
Note: IOTA 250-30 is a product that has been commercialized for many years, not a newly launched model. It is mainly suitable for electrical and instrumentation application scenarios requiring low viscosity, low pour point and good dielectric properties.
