Vinyl Terminated Polydimethylsiloxane (Vinyl Silicone Oil)

Product Definition

Vinyl terminated silicone oil is a type of linear organosilicon polymer with reactive vinyl functional groups at both ends of its molecular chain. It serves as the core base material for addition-cure silicone systems. With stable molecular structure and controllable reactivity, it can undergo hydrosilylation reaction with hydrogen-containing silicone oil under platinum catalyst at ambient or medium temperature to form cured elastomers. It is an indispensable base raw material for liquid silicone, high-end potting adhesive, bonding and sealing materials.

Product Introduction

This product is a colorless, transparent viscous liquid with extremely low odor, high purity and few impurities. With active vinyl groups at both ends of the molecule, it features strong crosslinking reactivity. The curing process releases no small molecular by-products, no corrosion and minimal yellowing. Viscosity can be customized according to customer requirements (low, medium and high viscosity available), compatible with most addition-cure silicone formula systems. It is widely used in industrial, electronic, mold, medical-grade silicone product manufacturing.

Core Advantages

1. Addition curing system, eco-friendlyNo by-products or small molecules released during curing, odor-free. The finished product has no cracking and low shrinkage, meeting high-end environmental production standards.
2. Stable reactivity & good storage performanceEvenly distributed vinyl active groups, high batch stability, no self-crosslinking easily. It is not easy to deteriorate under room temperature storage, suitable for long-term mass production.
3. Excellent high & low temperature resistance and aging resistanceThe cured silicone products can work stably at -50℃ ~ 200℃ for long-term service. It has great resistance to UV, ozone and weathering. It will not easily turn yellow, harden or pulverize under outdoor exposure.
4. Outstanding electrical insulationHigh insulation, moisture-proof, waterproof and leakage-proof properties, ideal for potting, insulation sealing and circuit protection of electronic components.
5. Great compatibility & flexible formulationFully compatible with all kinds of silicone rubber powder, reinforcing fillers, color pastes and functional additives. Hardness, toughness and transparency can be freely adjusted.
6. High toughness & good elasticity for finished partsStable crosslinked structure, excellent tensile strength, tear resistance and rebound performance, making soft and durable silicone products.

Limitations

1. Cannot be cured independentlyIt needs to be matched with hydrogen-containing silicone oil crosslinker plus platinum catalyst to form elastomer, with higher formulation threshold than condensation-cured silicone.
2. High risk of catalyst poisoningIt is highly sensitive to impurities such as sulfur, nitrogen, phosphorus, tin and heavy metals. Contact with contaminants will cause curing failure, so high cleanliness of production environment is required.
3. Viscosity selection must match your processDifferent viscosities are for different application scenarios. It must be selected precisely according to your process (potting, compression molding, extrusion), and different grades cannot be used interchangeably.

Application Fields

1. Base raw material for addition-cure liquid silicone rubber (LSR)
2. Insulation potting compound, waterproof sealant for electrical & electronic devices
3. Transparent soft gel, mold silicone, silicone for artwork casting
4. High-end silicone tubes, silicone gaskets, shock buffer accessories
5. Silicone products for food contact and medical applications
6. Raw material for silicone coating, modified resin and special adhesive

General Specifications

• Appearance: Colorless transparent viscous liquid
• Curing method: Platinum catalyzed hydrosilylation curing
• Curing feature: No small molecule release, low shrinkage, high transparency
• Applicable system: All addition-cure organosilicon systems
• Customizable viscosity: Low / medium / high viscosity upon request

Packaging

• Standard package: 20KG plastic pail, 200KG iron drum with PE inner liner
• Small batch repacking and customized packaging are available
• Classified as ordinary chemical goods, non-dangerous goods, convenient for export customs declaration

Storage & Shelf Life

• Storage condition: Store in cool, dry, ventilated and dark warehouse. Recommended storage temperature: 5℃–30℃.
• Shelf life for unopened original package: 12 months
• After opening, it is recommended to use up within 3 months to avoid water absorption and dust contamination which affect curing performance.

Notes for Use

1. Keep away from sulfur, nitrogen, phosphorus, tin, amine compounds, sulfides and other contaminants to prevent platinum catalyst poisoning and failure.
2. Keep containers, equipment and tools clean and impurity-free before use.
3. Do not randomly mix different viscosity grades. Select grades according to your process requirements.
4. Viscosity will rise at low temperature. Warm to room temperature before stirring and feeding.
5. Gloves are recommended during operation to avoid prolonged direct skin contact.

FAQ

Q1: Can vinyl silicone oil cure by itself?

A: No. It must be formulated with hydrogen-containing silicone oil crosslinker and platinum catalyst to crosslink and cure into elastic silicone rubber.

Q2: Why is the mixed adhesive uncured sometimes?

A: 90% of the cases are caused by contamination (poisoning by sulfur, tin or nitrogen), improper proportion or uneven mixing. Our product itself has high stability and will not fail under normal conditions.

Q3: Can different viscosities be customized?

A: Yes. We support customization across the full viscosity range for different processes including potting, molding, extrusion and coating.

Q4: Will the finished product turn yellow or shrink?

A: High-purity vinyl silicone oil for addition curing achieves nearly zero shrinkage and long-term anti-yellowing performance, much more stable than ordinary condensation cured silicone.

Q5: Is it suitable for high-end export products and food-grade applications?

A: Yes. High-purity grades can be used for food contact, daily goods and medical peripheral silicone formulations.