Leave Your Message
Polydimethylsiloxane (PDMS), commonly known as polydimethyl silicone oil, is a versatile organosilicon polymer characterized by a repeating Si–O backbone with methyl side groups. This molecular architecture delivers an extraordinary combination of thermal stability, low viscosity variation across wide temperature ranges, and chemical inertness — making it one of the most preferred heat transfer fluids in modern industry.
Unlike conventional mineral oils or glycol-based thermal fluids, PDMS silicone oil maintains consistent thermal performance from –60°C up to 300°C, enabling reliable operation in both cryogenic cooling and high-temperature processing environments. Its low vapor pressure, non-corrosive nature, and electrical insulating properties further expand its usability across sensitive industrial and electronic applications.
The global demand for high-efficiency thermal management solutions is accelerating, driven by the rapid growth of electric vehicles, data centers, semiconductor manufacturing, and renewable energy systems. Polydimethyl silicone oil stands at the center of this transformation.
PDMS silicone oil retains its physical and chemical integrity across an extreme temperature range of –60°C to 300°C, resisting oxidation and thermal degradation far better than conventional petroleum-based fluids.
Available in viscosity grades from 0.65 cSt to 100,000 cSt, PDMS fluids exhibit remarkably flat viscosity-temperature curves, ensuring consistent flow and heat exchange efficiency across operational temperature swings.
With volume resistivity exceeding 10¹⁴ Ω·cm and high dielectric strength, polydimethyl silicone oil serves as both a thermal and electrical insulator — ideal for transformer cooling and EV battery thermal management.
PDMS is non-toxic, non-reactive with metals, plastics, and elastomers, and exhibits extremely low vapor pressure. Its high flash point (≥360°C) makes it significantly safer than hydrocarbon thermal oils in high-temperature environments.
Unlike many thermal fluids that gel or solidify at sub-zero temperatures, polydimethyl silicone oil maintains pumpability and heat transfer efficiency down to –60°C, making it indispensable for cold-chain and cryogenic applications.
The oxidative and hydrolytic stability of PDMS extends fluid service life dramatically, reducing replacement frequency and total cost of ownership. Its low environmental persistence and non-bioaccumulation profile align with modern green chemistry standards.
As EV adoption accelerates globally, battery pack thermal management has become a critical engineering challenge. Polydimethyl silicone oil is increasingly deployed in immersion cooling systems for lithium-ion battery packs, offering direct contact heat extraction with zero electrical conductivity risk. Its wide operating temperature range ensures reliable performance in both extreme cold (–40°C Arctic climates) and high-temperature fast-charging scenarios, extending battery cycle life and improving safety margins.
With AI workloads driving server power densities beyond 100kW per rack, traditional air cooling is no longer sufficient. Single-phase and two-phase immersion cooling systems using PDMS silicone oil are being rapidly adopted by hyperscale data centers. The fluid's dielectric properties protect sensitive electronics while enabling PUE (Power Usage Effectiveness) ratios approaching 1.02 — dramatically reducing energy consumption and carbon footprint compared to conventional air-cooled facilities.
Chemical reactors, pharmaceutical synthesis equipment, food processing lines, and polymer extrusion systems all require precise temperature control. PDMS silicone oil circulating in jacketed vessels and heat exchangers provides uniform, controllable thermal profiles. Its non-reactive nature ensures product purity in food and pharma applications, while its high-temperature stability supports continuous operation in demanding chemical processing environments without fluid degradation or deposit formation.
High-voltage transformers and switchgear generate substantial heat that must be efficiently dissipated. Polydimethyl silicone oil serves as both a cooling medium and dielectric insulator in distribution and power transformers. Compared to traditional mineral transformer oils, PDMS offers superior fire resistance (flash point >360°C), eliminating the risk of transformer fires in urban substations and indoor electrical installations — a critical safety advantage driving regulatory adoption in Europe and North America.
CSP plants require heat transfer fluids capable of operating at 200–400°C to efficiently capture and transport solar thermal energy to steam turbines. Advanced PDMS formulations with enhanced thermal conductivity additives are being evaluated and deployed in parabolic trough and solar tower systems. Their long service life and low maintenance requirements align perfectly with the 25+ year operational horizons of utility-scale solar installations.
Semiconductor fabrication requires ultra-precise temperature control during deposition, etching, and lithography processes. PDMS-based thermal fluids in temperature control units (TCUs) deliver ±0.1°C temperature uniformity across wafer chucks and process chambers. Their ultra-low particle contamination and compatibility with cleanroom environments make them the fluid of choice for leading-edge chip manufacturers operating at 3nm and below process nodes.
| Parameter | Specification | Test Method | Significance |
|---|---|---|---|
| Appearance | Colorless, transparent liquid | Visual inspection | Purity indicator |
| Kinematic Viscosity (25°C) | 0.65 – 100,000 cSt (multiple grades) | ASTM D445 | Flow & pumping characteristics |
| Thermal Conductivity | 0.15 – 0.17 W/(m·K) | ASTM E1225 | Heat transfer efficiency |
| Specific Heat Capacity | 1.46 – 1.76 J/(g·°C) | DSC method | Thermal energy storage |
| Flash Point | ≥ 300°C (high-grade: ≥ 360°C) | ASTM D92 | Fire safety classification |
| Pour Point | –60°C to –50°C | ASTM D97 | Low-temperature operability |
| Density (25°C) | 0.96 – 0.98 g/cm³ | ASTM D4052 | System design parameter |
| Dielectric Strength | ≥ 15 kV/mm | IEC 60156 | Electrical insulation safety |
| Volume Resistivity | ≥ 1 × 10¹⁴ Ω·cm | IEC 60247 | Dielectric cooling suitability |
| Operating Temperature Range | –60°C to 300°C | Application testing | Versatility across industries |
| CAS Number (PDMS) | 63148-62-9 | — | Chemical identity reference |
The global thermal management fluids market is projected to exceed USD 18 billion by 2030, with silicone-based fluids capturing an increasing share driven by EV adoption, AI infrastructure buildout, and industrial decarbonization mandates. PDMS demand is growing at a CAGR exceeding 8% in heat transfer applications alone.
The proliferation of AI accelerators (GPUs, TPUs) with TDP exceeding 700W per chip is making immersion cooling with dielectric silicone oil a necessity rather than an option. Major cloud providers including Microsoft, Google, and Meta are actively piloting and deploying PDMS immersion cooling at scale in next-generation data centers.
Regulatory pressure from REACH, RoHS, and emerging EU Green Deal requirements is accelerating the replacement of legacy mineral and synthetic hydrocarbon thermal oils with safer, longer-lasting PDMS alternatives. Silicone oil's non-hazardous waste classification and extended service life align with corporate ESG targets and circular economy principles.
Manufacturers are increasingly demanding application-specific PDMS formulations. From ultra-low viscosity (1–5 cSt) fluids for microelectronics cooling to high-viscosity (1000+ cSt) grades for industrial heat exchangers, the trend toward customized silicone oil specifications is reshaping supply chain dynamics and creating premium market segments.
China remains the world's largest producer and exporter of PDMS silicone oil, with production capacity expanding rapidly in Zhejiang, Jiangsu, and Shandong provinces. Chinese exporters like Bayee Chemical are bridging global demand with competitively priced, ISO-certified silicone oil products, capturing significant market share in Europe, the Americas, and Southeast Asia.
R&D investment in nano-enhanced PDMS fluids incorporating graphene oxide, carbon nanotubes, and boron nitride nanoparticles is yielding thermal conductivity improvements of 20–40% over base fluids. These advanced formulations are expected to enter commercial production by 2026, further expanding the performance envelope of silicone-based heat transfer systems.
Hangzhou Bayee Chemical Co., Ltd. started chemical products exporting from 2001, manufacturers based exporter focused in chemical products covering Silicone series, Phosphorus series including Silicone Monomers, Cyclosiloxane, Silicone Oils, Agro Chemicals, Fire Retardants & Auxiliaries etc. Company has direct Import & Export right, Dangerous Cargo Permission Certificate.
Based on 20+ years exporting history and persistent improvements, we have now grown and developed into a well known & good reputation exporter with ISO 9001:2015, AAA Credit certified company, also granted by local government as Healthy Enterprise, and A level Tax Ranking.
Company Details as Below:
Based on strategic factories in Zhejiang, Jiangsu, Shandong, Anhui, Jiangxi, Hubei, Hunan, Hebei and Henan provinces etc, we export not only good quality products, competitive EXW costs, but also honesty, safety and international philosophies to customers. We work tightly with competitive production sites across whole China, who have special advantages, located in professional industrial areas, close to raw material bases, locally supplied with energy — gas or steam pipe connected with neighbour enterprises in same areas to reduce transportation costs. Our factories have advanced ideas in technique crafts for higher yield production, unit consumption reducing from raw materials, also re-used the by-products for own downstream production for other products. By the way, we always keep close observation about raw material changing trend, react actively with factories shoulder by shoulder from organizing raw material at good times to secure more competitive production costs and share spaces with customers helping win their market shares. At the same time, we have wide connection with Chinese powerful chemical institute organizations for testing and supervising quality control in production process.
Up till now we've developed and supplied to many countries and areas all over the world, with main markets in European countries (Germany, Italy, UK, Spain, Ukraine, Russia, Poland, etc.), USA, South America, Mid East, South-east Asia, Australia, etc. Also seeking more strategic partners and customers under mutual benefits and work through the whole purchasing chain.
Wechat Code