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In the fields of special industrial lubrication, heat transfer and radiation-exposed system supporting materials, phenyl silicone fluids have become a widely recognized choice for scenarios that require stable performance under harsh working conditions. IOTA BJ550 is a representative single-phenyl component methyl phenyl polysiloxane polymer in this category. By introducing phenyl functional groups into the siloxane molecular chain, the material forms a steric hindrance protection for the Si-O backbone, which effectively improves the thermal stability compared with conventional polydimethylsiloxane, allowing it to maintain stable physical and chemical properties across a wider temperature range.
IOTA BJ550 appears as a colorless and transparent liquid at room temperature. Its specific gravity at 25℃/15.6℃ is 1.11, and the kinematic viscosity at 25℃ reaches 125 mm²/s. The viscosity-temperature coefficient is only 0.79, which means the change of viscosity with temperature is far smaller than that of conventional petroleum-based oils. Even at low temperature, it will not experience a sharp viscosity increase, and it can still maintain fluidity at its pour point of -50℃. Its flash point is no less than 300℃, fire point is higher than 343℃, and auto-ignition temperature reaches 482℃, which greatly reduces the risk of accidental combustion during storage and operation. The volatile content tested at 250℃ for 4 hours is only 2.1%, so there will be no large amount of evaporation loss even after long-term operation at high temperature, and the frequency of refilling and daily maintenance can be significantly reduced.
IOTA BJ550 has inherent chemical inertness, which means it will not cause corrosion to common industrial metals such as carbon steel, stainless steel, copper and aluminum. It also will not erode or accelerate the aging of sealing components commonly used in pressure reducers, valves and precision instruments, so the sealing performance of these equipment can be kept in good condition for a long time. It has relatively high compressibility, and the compression rate shows a stable gradient change under different pressure levels: 0.50% at 1000 psi, 2.30% at 5000 psi, 3.95% at 10000 psi and 6.50% at 20000 psi. This characteristic makes it very suitable for shock absorption and motion damping applications, as it can absorb impact energy smoothly when the equipment is subjected to external force, and reduce the damage to precision internal components.
Its antioxidant performance remains stable in continuous operation, and the thermal conductivity can stay relatively constant over a wide temperature range. The thermal conductivity at 50℃ is 0.00035 g-Cal/cm²-sec-℃, and the specific heat at 100℃ is 0.396, which makes it a qualified heat transfer medium to distribute heat evenly in the system. Its radiation resistance value reaches 1.7×10⁸ rads, so the molecular structure will not undergo rapid cracking or performance degradation even in environments with radiation exposure, and the original fluid state can be maintained for a long time.
With the support of the above properties, IOTA BJ550 can be used in hydraulic surge arresters, various equipment buffers, hydraulic drive valves and supporting instruments in nuclear power plants, as well as other applications with radiation exposure. It can also be used as a high-temperature heat carrier in scenarios requiring insulation, lubrication, damping, shock prevention and dust prevention. In addition, it can act as the base oil for high-temperature lubricating oils and greases, providing effective lubrication protection for moving parts that operate under high temperature for a long time, reducing the wear between contact surfaces and extending the service life of the whole equipment.
