Vinyl Terminated Silicone Fluid factory
Vinyl Terminated Silicone Fluid
Everything you need to know about our products and company
Vinyl terminated silicone fluid (ViPDMS) represents a specialized class of organosilicon compounds characterized by reactive vinyl groups (-CH=CH₂) at both ends of the polydimethylsiloxane molecular chain. This unique chemical structure, with the formula CH₂=CH-Si(CH₃)₂O[(CH₃)₂SiO]ₙ(CH₃)₂Si-CH=CH₂, provides exceptional versatility across industrial applications. The CAS number 68083-19-2 identifies this material, which serves as a critical intermediate in silicone rubber production and various modification applications.
The viscosity difference between 1000cSt and 5000cSt grades fundamentally impacts their performance characteristics and application suitability. The 1000cSt grade typically exhibits a vinyl content of 0.29-0.36%, while the 5000cSt grade contains 0.16-0.18% vinyl content. This inverse relationship between viscosity and vinyl content directly influences reactivity, crosslinking density, and final product properties.
Mechanical Properties Comparison
| Property | 1000cSt Grade | 5000cSt Grade |
|---|---|---|
| Viscosity (25°C) | 950-1050 cSt | 4500-5500 cSt |
| Vinyl Content | 0.29-0.36% | 0.16-0.18% |
| Specific Gravity | 0.970 | 0.970 |
| Volatility (150°C, 3h) | ≤1.5% | ≤1.5% |
| Tensile Strength (HTV) | 4-8 MPa | 4-8 MPa |
| Elongation at Break | 200-600% | 200-600% |
High-Temperature Vulcanized (HTV) Silicone Rubber
The 1000cSt grade excels in applications requiring higher crosslinking density and faster curing times. Its elevated vinyl content enables more efficient hydrosilylation reactions with hydrogen-containing silicone oils, making it ideal for producing HTV silicone rubber with enhanced mechanical strength and tear resistance. This grade is particularly suitable for automotive seals, medical device components, and industrial gaskets where durability under thermal cycling is critical.
Conversely, the 5000cSt grade serves as an excellent base polymer for producing softer, more flexible silicone elastomers. Its lower vinyl content results in reduced crosslink density, yielding materials with superior elongation properties and low-temperature flexibility. This makes it the preferred choice for baby products, medical tubing, and flexible seals requiring -50°C to 250°C operational range.
Liquid Silicone Rubber (LSR) Applications
In LSR formulations, the 1000cSt grade offers superior flow characteristics during injection molding processes. Its lower viscosity facilitates easier filling of complex mold cavities and reduces cycle times. This grade is extensively used in electronic encapsulation, LED potting compounds, and precision medical components where dimensional stability and thermal stability are paramount.
The 5000cSt grade, with its higher molecular weight, provides improved green strength and reduced shrinkage during curing. This characteristic makes it valuable for producing thick-section parts and compression molding applications where dimensional accuracy is critical. Its enhanced thermal stability (short-term tolerance ≤300°C for 1 hour) ensures reliable performance in demanding environments.
Surface Modification and Coatings
Both grades demonstrate excellent compatibility with organic polymers, but their performance diverges in coating applications. The 1000cSt grade offers superior surface lubrication and scratch resistance, making it ideal for textile finishing, anti-fouling coatings, and release agents. Its lower molecular weight enables better penetration into substrates and faster drying times.
The 5000cSt grade provides enhanced durability and longer-lasting surface protection. Its higher viscosity contributes to improved film formation and resistance to abrasion, making it suitable for protective coatings on metals, plastics, and construction materials. The material’s excellent weather resistance (UV aging QUV 3000h: ΔE <1.5) ensures long-term performance in outdoor applications.
The global vinyl terminated silicone fluid market has experienced significant growth, driven by expanding applications in automotive, electronics, healthcare, and construction sectors. Market analysis indicates that grades between 1000-5000 cSt represent the largest market segment, accounting for substantial volume in both developed and emerging economies.
Quality standards and certifications play a crucial role in material selection. Industrial grade products typically conform to GB/T 30942 Vinyl-Terminated Polydimethylsiloxane and ASTM D5665 standards. Medical grade variants must pass USP Class VI and ISO 10993 biocompatibility tests, with specific requirements for cytotoxicity and extractables. For EU market access, REACH registration and compliance with EC 1935/2004 food-contact material requirements are mandatory.
Processing Parameters
The 1000cSt grade offers advantages in processing efficiency due to its lower viscosity. It requires less energy for mixing and pumping, and facilitates easier incorporation of fillers and additives. This grade typically exhibits faster curing times (30 seconds to 5 minutes with platinum catalysts) and lower exotherm during curing, making it suitable for thick-section applications.
The 5000cSt grade provides superior green strength and reduced post-cure shrinkage. Its higher molecular weight contributes to better dimensional stability and reduced mold release force. However, it may require higher processing temperatures and longer mixing times to achieve homogeneous formulations.
Cost-Performance Optimization
While the 5000cSt grade typically commands a higher price per kilogram due to its higher molecular weight, its performance benefits often justify the premium in applications requiring enhanced mechanical properties and durability. The 1000cSt grade offers excellent cost-effectiveness for general-purpose applications where the highest performance specifications are not required.
Biyuan has established itself as a leading innovator in vinyl terminated silicone fluid technology, offering a comprehensive portfolio of products that bridge the performance gap between conventional grades. The company’s proprietary manufacturing processes enable precise control over molecular weight distribution and vinyl content, resulting in materials with exceptional consistency and reliability.
Biyuan’s 1000cSt and 5000cSt grades undergo rigorous quality control testing, including viscosity verification, vinyl content analysis, and volatile matter determination. The company’s commitment to research and development has yielded products that exceed industry standards for thermal stability, chemical resistance, and mechanical performance. With applications spanning from automotive seals to medical implants, Biyuan’s vinyl terminated silicone fluids demonstrate the company’s technical expertise and market leadership in advanced silicone materials.
The choice between 1000cSt and 5000cSt grades ultimately depends on specific application requirements, processing conditions, and performance targets. Both grades offer unique advantages that can be leveraged to optimize product performance across diverse industrial sectors.
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