Vinyl Silicone Oil Supplier in China
High-Purity Vinyl-Terminated PDMS for RTV, LSR and High-Performance Silicone Rubber
Vinyl Silicone Oil (Vinyl-Terminated Polydimethylsiloxane, VPDMS) is the key reactive silicone polymer used across addition-cure systems such as RTV-2, LSR and HTV silicone rubber. KosNature supplies a complete viscosity range from 30 to 100,000 mm²/s with stable vinyl content, low volatility and excellent compatibility with silicone resins, reinforcing fillers and crosslinkers such as hydride-terminated polysiloxanes.
Our vinyl silicone oils are produced with strict ionic-metal control (<20 проміле), low acid value and narrow molecular-weight distribution, ensuring predictable curing behavior and stable mechanical properties in finished elastomers.
What Is Vinyl Silicone Oil (VPDMS)?
Vinyl silicone oil is a linear PDMS polymer terminated with vinyl groups (–CH=CH₂). These terminal vinyl groups enable addition reactions with Si–H containing crosslinkers under platinum catalysis.
Because the vinyl groups are located at the polymer chain ends, curing behavior is clean, well-controlled and highly reproducible.
This makes vinyl silicone oil essential for:
RTV-2 silicone rubber
LSR liquid silicone rubber
HTV high-temperature vulcanized silicone rubber
silicone molding materials
high-transparency consumer and medical products
electronic encapsulation and potting compounds
Compared with non-reactive PDMS oils, VPDMS participates directly in the crosslinking network, producing elastomers with improved tensile strength, elongation, resilience and aging resistance.
Key Advantages of Our Vinyl Silicone Oil
| 01 Full Viscosity Range | 02 Stable Vinyl Content |
|---|---|
| 30–100,000 mm²/s for all RTV/LSR formulations | Tight vinyl percentage ensures consistent crosslinking |
| 03 High Transparency | 04 Low Volatile (<1.5%) |
|---|---|
| Low metal ions → ideal for medical & baby products | Clean curing, fewer defects, better mechanical stability |
Available Specifications
| Оцінка | INCI Name | Зовнішній вигляд | В'язкість (mPa·s, 25°C) | Density (g/cm³) | Vinyl Content (%) | Volatile (%) |
|---|---|---|---|---|---|---|
| KOS-301 30 | Vinyl Polydimethylsiloxane | Colorless to light yellow | 25–35 | 0.97 | 2.68–2.78‰ | <1.5 |
| KOS-301 50 | Vinyl Polydimethylsiloxane | Colorless to light yellow | 45–50 | 0.97 | 1.65–1.75‰ | <1.5 |
| KOS-301 70 | Vinyl Polydimethylsiloxane | Colorless to light yellow | 63–77 | 0.97 | 1.30–1.60‰ | <1.5 |
| KOS-301 100 | Vinyl Polydimethylsiloxane | Transparent | 85–120 | 0.97 | 0.90–1.15‰ | <1.5 |
| KOS-301 230 | Vinyl Polydimethylsiloxane | Transparent | 210–250 | 0.97 | 0.70–0.73‰ | <1.5 |
| KOS-301 350 | Vinyl Polydimethylsiloxane | Transparent | 315–385 | 0.97 | 0.47–0.58‰ | <1.5 |
| KOS-301 500 | Vinyl Polydimethylsiloxane | Transparent | 450–550 | 0.97 | 0.37–0.46‰ | <1.5 |
| KOS-301 1000 | Vinyl Polydimethylsiloxane | Transparent | 950–1050 | 0.97 | 0.21–0.26‰ | <1.5 |
| KOS-301 2000 | Vinyl Polydimethylsiloxane | Transparent | 1900–2100 | 0.97 | 0.18–0.23‰ | <1.5 |
| KOS-301 3500 | Vinyl Polydimethylsiloxane | Transparent | 3150–3850 | 0.98 | 0.12–0.16‰ | <1.5 |
| KOS-301 5000 | Vinyl Polydimethylsiloxane | Transparent | 4750–5250 | 0.98 | 0.10–0.15‰ | <1.5 |
| KOS-301 10000 | Vinyl Polydimethylsiloxane | Transparent | 9000–11000 | 0.98 | 0.09–0.12‰ | <1.5 |
| KOS-301 20000 | Vinyl Polydimethylsiloxane | Transparent | 19000–21000 | 0.98 | 0.08–0.10‰ | <1.5 |
| KOS-301 60000 | Vinyl Polydimethylsiloxane | Transparent | 54000–60000 | 0.98 | 0.07–0.09‰ | <1.5 |
| KOS-301 100000 | Vinyl Polydimethylsiloxane | Transparent | 90000–110000 | 0.98 | 0.06–0.08‰ | <1.5 |
Applications Across Cosmetics, Textiles and Industrial Processing
1. RTV & LSR Silicone Rubber
Vinyl PDMS is the base polymer in:
RTV-2 molding compounds
LSR injection molding systems
optical-level silicone elastomers
electric / electronic potting gels
It determines:
hardness (Shore A)
tensile strength
elongation
tear resistance
transparency
2. HTV High-Temperature Vulcanized Rubber
VPDMS improves:
thermal aging resistance
rebound resilience
UV resistance
processing behavior with silica fillers
Used in:
household silicone products
kitchenware
medical-grade silicone parts
3. Electronic & Electrical Components
Vinyl silicone oil is widely used in:
LED encapsulation
electronic potting gels
connector seals
flame-retardant silicone parts
Its low metal content and transparency ensure stable electrical reliability.
4. New Energy & Battery Systems
Used in:
insulation silicone materials
battery-pack sealing
high-temperature silicone gaskets
flame-retardant silicone elastomers
5. Medical & Healthcare Silicone
For products requiring purity and stability:
medical tubing
valve components
inhaler accessories
baby nipples and pacifiers
6. Household & Consumer Goods
Such as:
fitness bands
wearable silicone
kitchen molds
baby feeding products
7. Промислове застосування
industrial seals
mechanical gaskets
building-grade silicone rubber
solar modules
general-purpose silicone elastomers
Why Work With KosNature
Complete viscosity range up to 100,000 mm²/s
Controlled vinyl content for precise crosslinking
Transparent, low-metal, low-volatile
Stable industrial supply
Export experience for RTV/LSR manufacturers
Packaging options from 20 kg to 200 kg drums and IBCs
Related products We Supply
ПОШИРЕНІ ЗАПИТАННЯ
Vinyl silicone oil provides the reactive vinyl end groups needed for addition-cure crosslinking with Si–H polymers. It determines the final elastomer’s hardness, tensile strength, elongation, transparency and aging resistance. Without stable vinyl content, mechanical performance becomes inconsistent.
Так. KOS-301 grades have excellent compatibility with:
hydrogen silicone oil (crosslinker)
MQ silicone resin
reinforcing silica
vinyl-functional copolymers
low-volatile PDMS
This allows precise mechanical tuning for different product lines.
Так. For large orders, we can tailor:
viscosity
vinyl percentage
volatility level
molecular weight distribution
Customization helps customers optimize mechanical strength or processing speed.