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 do 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 Ppm), 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
| Razred | INCI Name | Izgled | Viskoznost (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. Industrijske primjene
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
FAQ
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.
Da. 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.
Da. For large orders, we can tailor:
viskoznost
vinyl percentage
volatility level
molecular weight distribution
Customization helps customers optimize mechanical strength or processing speed.