In the demanding landscapes of industrial chemistry, Medium Phenyl Silicone Oil (MPSO), chemically recognized as poly(dimethylsiloxane-co-diphenylsiloxane) or methylphenylsiloxane copolymer, represents a critical class of synthetic fluids. By substituting a specific ratio of methyl groups on the siloxane backbone with phenyl groups (typically between 15% and 25% mole ratio), chemical engineers achieve a hybrid molecule that yields exceptional stability under conditions where conventional dimethyl silicone oils fail.
The introduction of phenyl groups introduces bulky, electron-dense aromatic rings into the flexible siloxane chains. This modifications serves multiple industrial purposes:
Historically, high-phenyl and medium-phenyl silicone fluids were produced only by a handful of Western chemical giants. Today, Chinese factories, driven by significant capital investments and highly integrated raw material supply chains, have established massive manufacturing hubs. Shandong Boctok Chemical Co. represents the pinnacle of this shift, delivering unmatched capacity and cost efficiency to global markets.
By working adjacent to major petrochemical complexes (such as SINOPEC and PetroChina), Chinese manufacturers like Boctok secure continuous, reliable access to essential precursors, including benzene, chlorosilanes, and dimethyl monomers. This insulates global buyers from volatile raw material price swings.
Boctok's newly expanded facilities in Bohai Industrial Park utilize state-of-the-art **DCS (Distributed Control System)** and **SIS (Safety Instrumented System)** configurations. Fully automated polymer synthesis ensures tight molecular weight distribution and consistent viscosity in every batch.
Chinese R&D centers are quick to customize formulations, offering custom viscosity configurations ranging from 20 cSt up to 10,000 cSt. They also tune phenyl mole ratios to meet specialized refractive index and lubrication parameters.
Choosing the right silicone fluid requires mapping physical properties against thermal and optical needs. Below is an engineering selection guide outlining the performance characteristics of Medium Phenyl Silicone Oil compared to other standard fluids.
| Property / Fluid Type | Standard Dimethyl Silicone Oil (PDMS) | Medium Phenyl Silicone Oil (MPSO) | High Phenyl Silicone Oil (HPSO) |
|---|---|---|---|
| Phenyl Mole % | 0% | 15% - 25% | 35% - 50% |
| Refractive Index (25°C) | 1.403 | 1.460 - 1.485 | 1.490 - 1.530 |
| Thermal Range (Continuous) | -50°C to 150°C | -40°C to 250°C | -30°C to 300°C |
| Radiation Resistance | Poor | Good | Excellent |
| Organic Resin Compatibility | Very Low | Moderate to High | Excellent |
| Key Use Cases | Basic Lubrication, Damping | LED Encapsulation, Heat-transfer, Paint additives | Aviation, Extreme High-Temp Lubricants |
Because of its structural versatility, Medium Phenyl Silicone Oil is adopted across a broad spectrum of extreme applications, satisfying the unique needs of global procurement teams.
MPSO serves as a critical dielectric fluid inside transformers, cables, and capacitors. It exhibits high breakdown voltages, excellent volume resistivity, and a low dissipation factor, even under high-humidity environments.
In technical textiles, MPSO acts as a high-temperature lubricant and softening agent. It ensures high thread sliding speeds without carbonization on heat needles, improving overall throughput.
Used as a key plasticizer and compatibilizer in structural adhesives and optical laminates. MPSO maintains structural elasticity across temperature fluctuations while keeping light refraction constant.
Due to its premium gloss-producing characteristics, MPSO is formulated into high-end hair serums, lip glosses, and skin creams. It reduces stickiness and coordinates perfectly with organic cosmetic ingredients.
As industries push towards decarbonization and miniaturized electronics, the functional demands on raw chemicals continue to tighten. Medium Phenyl Silicone Oils are at the center of several key technological macro-trends:
"The integration of silicon chemistry with modern electronics is no longer just about insulation; it is about managing thermal density and optical pathing in real time. Shandong Boctok Chemical Co. is positioning its materials to meet these demanding challenges."
As high-power LEDs and micro-LED configurations become standard, encapsulants must maintain high transparency without yellowing under high thermal loads and UV exposure. MPSO serves as a foundational component for these encapsulants. Its high refractive index allows for high extraction efficiency (more light leaving the package), directly reducing power draw.
EV drivetrains generate localized heat that requires efficient thermal dissipation. Medium phenyl silicone oils serve as non-conductive, fire-resistant cooling fluids. They do not corrode copper contacts, retain their low viscosity at low winter temperatures, and do not break down when subjected to thermal surges during fast charging cycles.
Global environmental standards are targeting volatile organic compounds (VOCs). Traditional volatile solvents are being phased out. MPSO, synthesized using advanced low-cyclic processes, features minimal outgassing. This property is crucial not only for environmental compliance (such as REACH and TSCA) but also to prevent fogging inside automotive headlight housings and cleanroom environments.
For multinational procurement agents, purchasing specialty silicone oils from China requires strict quality assurance and logistics reliability. Boctok streamlines this through specialized services:
We ensure our products conform to REACH registration parameters, standard TSCA compliance, and various RoHS requirements. Comprehensive certificates of analysis (COA) and material safety data sheets (MSDS) are provided with every batch.
Whether shipping to Europe, North America, Southeast Asia, or Russia, we utilize standard chemical shipping packages (including 200kg iron drums and 1000kg IBC containers). We offer tracking and temperature-stabilized shipping when required.
Boctok operates multiple production lines to ensure uninterrupted supply during facility maintenance windows. Our ISO9001 quality management structure runs continuously, from raw material inspection to final product loading.
Shandong Boctok Chemical Co. was founded in 2012 as a marketing and sales center for Boctok™ domestic and overseas businesses and achieved sales of US$280 million in 2023. The BOCTOK brand specializes in serving the Russian market.
Boctok has three main product categories, the first core business of organosilicone covers twelve series of silane coupling agents and crosslinkers, including aminosilane, methacrylate silane, epoxy silane, vinyl silane, mercaptosilane, alkyl silane, ethyl silicate, chlorosilane, silane isocyanates, phenyl silane, ureidosilane and serosilane. Boctok also focuses on silicon oil, silicon resin, and silicon rubber, covering high-hydrogen silicone oil, dimethicone, vinyl silicone oil, polyphenylmethyldimethylsiloxane, phenyl silicone oil, silanol silicone oil and OH polymer, alkoxy silicone oil, methyl MQ resin, vinyl VMQ resin, room-temperature vulcanized methyl silicone rubber, 110 methyl vinyl silicone rubber, 120 methyl phenyl rubber. They are widely used in glass fiber, electronics, wind energy, daily necessities, chemical industry, coatings, adhesives, XLPE electric cables and hot water pipes, oil field drilling, textiles, rubber and molding, etc. to improve the quality and performance of the applied products.
Boctok's Tier II core business is petroleum resins. We have invested in a key hydrocarbon resin manufacturer in China. We currently have three operating hydrocarbon resin factories located in Zibo, Fushun, and Nanjing. Taking advantage of reliable and abundant raw materials from SINOPEC and PetroChina, our advanced production facilities, and our decades of marketing experience, our products are widely used by customers, including many Fortune 500 companies, in both domestic and overseas markets. These products include C9 hydrogenated resins, C5 hydrocarbon resins, C5 modified C9 hydrocarbon resins, C9 hydrocarbon resins, C9 hydrocarbon resins, dicyclopentadiene, and methyl cyclopentadiene dimer.
Boctok also focuses on the agrochemical industry. It produces intermediates and raw materials for the production of pesticides, fungicides, insecticides, seed treatments, herbicides, plant growth regulators, and more.
Boctok's products are sold throughout China and exported to North America, Europe, Japan, South Korea, Australia, South America, the Middle East, India, Southeast Asia, Russia, etc., enjoying the well-deserved trust of customers.
Our products undergo rigorous testing to ensure that every aspect meets the highest quality standards.
We have advanced production lines that allow us to effectively expand production capacity and meet the demand for mass customization.
Our professional team is available online 24 hours a day to provide attentive service and answer all your questions.
An optimized logistics system ensures fast order processing and timely delivery to customers.
Boctok's diversified industrial solutions cover chemical materials, agricultural compounds, and synthetic intermediates. Explore our segments:
High-performance organosilicon matrices and customized formulation raw materials.
Active components, crop protectors, and intermediate synthesis aids.
Boctok Chemical
