In extreme-condition fields such as high-temp chains, metallurgical bearings, vacuum equipment, UHV insulation, and aerospace damping, traditional mineral oil faces oxidation deterioration and coking jam above 150℃, while ordinary PDMS also faces oxidative chain scission and gelation above 200℃; conventional mono-phenyl silicone oil (5-15 mol% phenyl) reaches 250℃/-40℃ but slowly thickens above 300℃ during long residence. With escalating demands for "COC flash ≥300℃, pour ≤-40℃, 320℃ long residence, 75-1400cSt wide viscosity options", sourcing a phenyl silicone oil with "high phenyl content, wide-temp, high flash point, usable as high-temp lubricating oil and grease base oil" has become the core gap for domestic extreme-condition lubrication localization. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. officially launches IOTA 255B High-Temperature Lubricating Oil (high-phenyl modified phenyl silicone oil). Characterized by "colorless to light yellow transparent liquid; viscosity 75-1400cSt (25℃, customizable); sp.gr. 1.02-1.10; COC flash ≥300℃; pour ≤-40℃; nD 1.4800-1.5150; operating range -60℃~320℃; 25kg PE drum or 200kg iron drum; non-toxic non-hazardous transport; 3-year shelf life", backed by "high-phenyl conjugate rigidify + dual-phenyl heat-oxidative resist + wide-viscosity long-life", it serves as the "wide-range slide anchor" for high-temp lubrication, insulating damping, and heat-transfer media. Molecular Architecture: High-Phenyl Dense-Graft + Si-O Bond Energy Lift + Wide-Viscosity Long-Life

• High-Phenyl Conjugate Rigidify: Phenyl introduction grants dual protection — the aromatic conjugated π-bond is more heat-oxidatively resistant than methyl; phenyl steric hindrance suppresses the depolymerization (back to cyclic siloxanes) that limits PDMS high-temp performance. High-phenyl grades enable continuous use at 280-300℃, short-term 350℃.
• Thermal-Oxidative Stability Without Coke: The steric shielding of phenyl groups makes 255B resistant to cracking, carbon deposition, or oxidative deterioration above 300℃, perfectly adapting to various high-temp continuous production equipment; meanwhile, mass loss rate under long-term 200℃ heating is far below methyl silicone oil, effectively avoiding dry-wear and vacuum system contamination caused by lubricant volatilization.
• Engineering Adaptation of Wide-Viscosity Span: The 75-1400cSt wide viscosity range covers all working conditions from spray lubrication (low) to high-temp grease base oil (high); sp.gr. 1.02-1.10 (higher density due to phenyl content exceeding ordinary methyl silicone oil), nD 1.4800-1.5150 tunable, matching optical coupling, precision damping, and other special scenarios.

Performance Leap: From "250℃ Ceiling" to "320℃ Long Residence"

• High-Temp No-Coke: Continuous 320℃ forced convection operation without easy oxidative decomposition or coking; COC flash ≥300℃, far exceeding mineral and synthetic hydrocarbon lubricants, significantly reducing high-temp fire risk.
• Ice-Fire Wide-Temp: -60℃~320℃ operating range, excellent low-temp flowability, no solidification at -40℃; solves the "high-phenyl must be brittle" paradox — phenyl disordered copoly suppresses crystallization.
• Lasting Lubricity: Phenyl large π-bond structure effectively disperses thermal energy, small viscosity-temperature coefficient, forms stable oil film on metal, ceramic, and various substrates, reducing friction and wear; excellent high-temp lubricity lowers equipment maintenance needs.
• Rad-Lube & Weathering: Excellent radiation resistance, γ-ray resistance suitable for nuclear industrial damping and anti-vibration fluids; good chemical stability in water, no absorption, emulsification, or deterioration in humid environments.
• Insulation-Damping Dual Effect: High volume resistivity, thermal conductivity up to 0.16 W/(m·K) or more (about twice that of ordinary hydrocarbon oils), not only effectively reducing gear and bearing friction wear, but also helping to rapidly transfer heat from motor stator windings and magnets to the casing.

Application Penetration: From High-Temp Chains to Aerospace

• High-Temp Lubricating Oil (Main Battlefield): Petroleum and chemical equipment high-temp lubrication, high-temp chains, bearings, and vacuum equipment lubrication media — resistant to cracking, carbon deposition, or oxidative deterioration above 300℃.
• High-Temp Grease Base Oil: Aerospace engine auxiliary systems, metallurgical equipment bearings, glass mold lubrication — high-viscosity grades (up to 1400cSt) provide excellent high-temp oil film retention.
• High-Temp Heat Carrier: Chemical reactor heat media, plastic extruder heating circulation, high-temp oven heat transfer media — self-extinguishing and chemical inertia of high-phenyl content make it a preferred option for high-temp heat transfer oil systems.
• Insulation Damping Anti-Vibration: High-voltage electrical equipment insulation and heat dissipation filling, aerospace and nuclear industrial damping and anti-vibration fluids, precision instrument damping oil.
• Dust-Proof Filling Media: Multi-functional media for insulation, lubrication, damping, anti-vibration, and dust-proof occasions.

IOTA Technical Guide: Sealed Moisture-Proof, Non-Haz Long Storage

• Application: As high-temp lubricating oil, select appropriate viscosity grade per equipment manufacturer spec (75-1400cSt customizable); as grease base oil, compound with thickener; as heat carrier, ensure system sealed to avoid oxidation.
• ⚠️ Taboo: Strictly prevent water ingress — hydrophobic but hydrolysis drops phenyls and thickens; immiscible with mineral/ester oils, no blending; avoid contact with oxidants, acid/base substances during storage.
• Storage: Place in clean, dry container, store in ventilated, dry warehouse; 25kg PE drum or 200kg iron drum; non-toxic non-hazardous transport; 3-year shelf life.
• Handling: Despite excellent high-temp viscosity stability, preheat above flow temperature before circulation when starting up at low temp.

Industry Insight: Phenyl silicone oil, with its unique high-temp stability and lubricity, has become an irreplaceable specialty lubricating material in high-temp lubrication, playing an important role in aerospace, electronics, chemical and other high-end fields. IOTA 255B, with "high-phenyl modification + 75-1400cSt wide viscosity + COC flash ≥300℃ + -60℃~320℃ wide-temp + 3-year shelf life", fills the key supply chain link for domestic high-phenyl high-temp lubricating oil in petrochemical, metallurgical bearings, aerospace, and nuclear industrial fields, providing import-substitution for downstream high-temp manufacturing enterprises (benchmarking international mono-phenyl phenyl silicone oils). This confirms domestic specialty silicone oils are leaping toward "high-phenyl dual-phenyl high-temp lubrication", with growing technical say in extreme-condition lubrication.