| HS Code | 110996 |
| Productname | Vinyl Terminated Silicone Oil RH-Vi1303 |
| Chemicalname | Vinyl-terminated polydimethylsiloxane |
| Casnumber | 68083-19-2 |
| Appearance | Colorless transparent liquid |
| Color | Colorless |
| Odor | Odorless |
| Viscosity | 3000 mPa·s at 25 °C (typical) |
| Vinylcontent | 0.4–0.6 wt% (typical) |
| Density | 0.96–0.98 g/cm³ at 25 °C |
| Refractiveindex | 1.403–1.406 at 25 °C |
| Volatilecontent | ≤1.0 wt% (typical) |
| Flashpoint | >200 °C (typical) |
| Watersolubility | Insoluble |
| Solventsolubility | Soluble in toluene and xylene |
| Reactivegroup | Vinyl |
As an accredited Vinyl Terminated Silicone Oil RH-Vi1303 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Vinyl Terminated Silicone Oil RH-Vi1303 is packed in 200 kg iron drums with inner plastic liners for safe storage and transport. |
| Container Loading (20′ FCL) | Vinyl Terminated Silicone Oil RH-Vi1303 loaded in a 20′ FCL container, securely packaged and stowed for safe chemical transport. |
| Shipping | Vinyl Terminated Silicone Oil RH-Vi1303 is typically shipped in sealed steel drums or IBC totes at ambient conditions. It is generally non-hazardous for transport unless the SDS or local regulations state otherwise; protect from moisture, contamination, and extreme temperatures. |
| Storage | Store Vinyl Terminated Silicone Oil RH-Vi1303 in a cool, dry, well-ventilated area, away from direct sunlight, heat, sparks, flames, and strong oxidizers. Keep containers tightly closed, properly labeled, and protected from moisture and contamination. Do not store near food, feed, or incompatible materials; avoid prolonged exposure to elevated temperatures. Use secondary containment where required and follow the SDS and local regulations. |
| Shelf Life | Shelf life is 12 months in original sealed containers, stored in a cool, dry place away from light and moisture. |
On a production-scale cold-runner liquid silicone rubber injection line for infant feeding components, the A-component matrix is formulated with RH-Vi1303 as the vinyl-terminated dimethylsiloxane base polymer at 70–85 wt% of total polymer, blended with 15–30 wt% hexamethyldisilazane-treated fumed silica and a platinum-divinyltetramethyldisiloxane complex adjusted to 5–15 ppm platinum by mass. The B-component contains a methylhydrogen siloxane crosslinker with reactive hydride content sufficient to achieve a terminal Si-H:Si-Vi molar ratio of 1.2:1 to 1.6:1, which on this configuration limits post-cure surface tack while retaining the tear strength required for repeated bite deformation. Metering is performed through a 1:1 static mixer with a pressure drop of 4–10 MPa, after which the compound enters a screw plasticizing unit with 32:1 L/D and is injected into a cold-runner mold block held at 140–180°C. Cure time for a 2.5 mm wall thickness is 25–45 s; demolding hardness stabilizes at 35–50 Shore A after 4 h at 200°C post-cure. Batch-to-batch variation in shot weight exceeding ±3% is commonly caused by moisture ingress above 0.1% in fumed silica or by insufficient venting during component A feeding. Compliance for this segment is anchored to FDA 21 CFR 177.2600, EU 1935/2004, ISO 10993-5, ISO 10993-10, and USP <87>/<88> for certain medical fluid-contact articles. Terminal products include baby bottle nipples, pacifier bulbs, peristaltic pump tubing seals, respiratory mask cushions, and enteral feeding connectors. Sulfur-containing gloves and amine-containing mold release agents must be excluded from this production environment because both poison the platinum catalyst and produce uncured surface layers.
Extrusion of addition-cure high-consistency silicone rubber for underhood profiles on a cold-feed vented pin-barrel extruder with 14:1 L/D requires a compound whose green strength allows the profile to retain shape before entering a hot-air vulcanization oven. RH-Vi1303 is introduced at 3–8 phr as a reactive plasticizer into the base gum, together with fumed silica at 25–40 phr, a hydrogen-functional crosslinker at an Si-H:Si-Vi ratio of 1.0:1 to 1.4:1, and a platinum catalyst level of 8–20 ppm; this addition level lowers compound Mooney viscosity from an initial range of 60–80 MU to 35–55 MU without producing exudation after 72 h at 23°C. The extruder barrel is maintained at 25–60°C, while the hot-air tunnel operates at 300–450°C over a residence time of 60–180 s, yielding a line speed of 10–30 m/min for profiles with wall thickness 2–6 mm. A common production failure is scorch in the feed section when the barrel temperature exceeds 70°C or when a dead spot in the screw retains compound longer than 10 min, causing premature hydrosilylation and surface roughness. Compliance references include SAE J20 R3 for coolant hose elastomer, ISO 188 for hot air aging at 150°C for 168 h, ISO 1431-1 for ozone resistance at 50 pphm, and ASTM D395-18 compression set at 150°C for 22 h under 25% deflection. Terminal parts include charge air hose liners, turbocharger outlet sleeves, oven door gaskets, and silicone-insulated cable sheaths. Amino-functional silane adhesion promoters should be avoided in this system because the amine group suppresses catalytic activity at the surface and leaves a tacky, uncured interfacial layer.
In power module encapsulation, RH-Vi1303 is formulated as the gel base at 80–95 wt% of the resin component, while the hardener portion contributes a methylhydrogen siloxane at an Si-H:Si-Vi molar ratio of 0.5:1 to 0.8:1 to create a soft network with penetration of 50–150 × 0.1 mm per ISO 2137 and a dielectric strength above 15 kV/mm after cure at 80–120°C for 30–60 min. The compound is dispensed under vacuum at 0.1–1 kPa absolute pressure to remove entrained air before filling around insulated-gate bipolar transistor stacks and aluminum bond wires; void content above 0.5% by volume is linked to partial discharge onset below 1 kV in impulse tests. Platinum is added at 2–10 ppm, and an adhesion promoter based on glycidoxypropyltrimethoxysilane is used at 0.5–2 wt%, but substrates with nitrogen-bearing flux residues from solder reflow must be cleaned before gel application because the platinum suffers reversible inhibition. Compliance for this segment rests on UL 94 V-0 at 0.5 mm, IEC 60068-2-14 thermal shock from -40°C to 125°C for 500 cycles, IEC 60243-1 dielectric strength, and ISO 14644-1 Class 8 assembly room conditions. Terminal finished forms include silicone gel for insulated-gate bipolar transistor modules, onboard charger potted assemblies, DC-DC converter cavity fill, and optical sensor encapsulation. Published data for this specific configuration is limited with respect to long-term 150°C aging beyond 1,000 h, so qualification runs should monitor hardness drift and weight loss rather than extrapolate from lower-temperature results.
For solventless thermal release coating lines running slot-die coaters at line speeds between 150 m/min and 400 m/min, RH-Vi1303 serves as the vinyl-terminated base fluid in a two-component addition-cure system whose coat weight is controlled at 0.8–2.0 g/m². The silicone layer is blended in-line with a methylhydrogen siloxane crosslinker at an Si-H:Si-Vi molar ratio of 1.5:1 to 2.5:1, a platinum-divinyltetramethyldisiloxane catalyst at 50–150 ppm, and an alkynol inhibitor at 0.05–0.5 wt% to prevent crosslinking in the mixing manifold before the die lips. The coated substrate passes through a forced-air thermal oven at 130–180°C with a residence time of 3–10 s, after which the release force against TESA 7475 tape is typically 5–30 cN/25 mm depending on the degree of hydrosilylation and extractable content. Migration of unreacted siloxane into the pressure-sensitive adhesive is controlled by post-cure humidification at 40°C and 60% RH for 24 h; extractables above 2% by mass can shift subsequent loop tack values by more than 15%. Compliance anchors are FDA 21 CFR 175.300, EU 1935/2004, BfR Recommendation XXXVI, and ISO 8295 for coefficient of friction. Terminal products include single-sided release liners for pressure-sensitive labels, differential release films for double-sided tape, casting paper for medical adhesives, and industrial release film for graphite lamination. Incompatibility with maleate-catalyzed condensation silicones from previous runs requires thorough solvent flushing of the die and delivery lines because residual tin catalysts consume the hydride crosslinker before film formation.
High-density silicone ink for garment embellishment is formulated around RH-Vi1303 at 55–75 wt% of the wet paste, with fumed silica at 8–15 wt%, a methylhydrogen crosslinker at an Si-H:Si-Vi ratio of 1.6:1 to 2.2:1, platinum at 5–20 ppm, and pigment paste at 5–15 wt%; the mixed paste exhibits a viscosity of 30,000–60,000 mPa·s at 10 s⁻¹ and a thixotropic index of 2.5–3.5 to hold sharp edges after screen passage through 48–80 mesh polyester screens. The deposition process uses a 75–80 Shore A squeegee blade at an angle of 45–60°, followed by infrared flash at 110–130°C for 30–60 s to evaporate trace moisture and raise green strength before registration of the next color. Final cure in a conveyor oven at 150–160°C for 3 min produces a film that withstands 50 wash cycles at 60°C according to ISO 6330 and ISO 105-C06, with no visible cracking or adhesion loss greater than 10%. Compliance requirements for apparel applications include Oeko-Tex Standard 100 Product Class I, REACH Annex XVII entries 50–63 for restricted azo and organotin compounds, and ZDHC MRSL 3.1 for textile chemical inputs. Terminal article types include three-dimensional raised logos, non-slip silicone grip patches on socks, heat transfer labels for sportswear, and elastic waistband prints. Fabric softener residues containing quaternary ammonium compounds must be removed before printing because cationic surfactants migrate to the silicone surface and inhibit the platinum-catalyzed addition at the fiber interface, leaving a chalky uncured inner layer after final cure.
Addition-cure silicone foam for electric vehicle battery pack perimeter seals is compounded with RH-Vi1303 as the vinyl-terminated base at 50–80 wt%, a methylhydrogen silicone oil serving as both crosslinker and blowing agent at 5–15 wt%, fumed silica at 5–15 wt%, water or silanol blowing co-agent at 0.5–3 wt%, and platinum catalyst at 5–20 ppm; the formulation generates hydrogen gas through Si-H hydrolysis with controlled foam rise before thermal cure. The mixed compound is dispensed through a precision gear pump onto a formed-in-place gasket track, then oven cured at 80–150°C for 10–30 min, resulting in a closed-cell density of 0.30–0.65 g/cm³ and compression set of 20–40% after 22 h at 100°C under 25% deflection per ASTM D1056-20. In contrast to peroxide-cured silicone sponges, this addition-cure route leaves no acidic peroxide decomposition residues that can corrode nickel-plated busbars or aluminum cell cans. Compliance for battery pack sealing includes UL 94 V-0 at 2 mm, SAE J369 for flammability of interior materials, ISO 6469-1 for electric vehicle safety, and GB/T 31467.3 for battery pack environmental exposure; some programs also require IP67 seal integrity after 1 m water immersion for 30 min. Terminal products include prismatic cell module perimeter gaskets, battery pack lid seals, fuel cell bipolar plate edge seals, and vibration isolation pads between cell modules. A limitation of this system is sensitivity to condensed moisture in the mixing head; free water above 0.2% by mass accelerates hydrogen evolution and can create open-cell collapse or void channels that reduce seal force retention by more than 30% after thermal cycling.
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Vinyl Terminated Silicone Oil RH-Vi1303 is a linear polydimethylsiloxane terminated at both chain ends with vinyldimethylsilyl groups. The fluid is supplied as a clear, low-volatile liquid with a nominal kinematic viscosity of 1,000 mm²/s at 25 °C. Vinyl content is controlled to 0.13 mmol/g, equivalent to 0.35 wt% vinyl, as determined by quantitative 1H NMR integration or iodometric titration after solvent extraction. The polymer is produced by base-catalyzed equilibration of octamethylcyclotetrasiloxane with 1,3-divinyltetramethyldisiloxane as the end-capping agent, followed by vacuum stripping to reduce low-molecular-weight cyclic siloxane content to ≤0.5 wt%. The resulting molecule carries two terminal vinyl groups per chain and no significant pendant vinyl functionality; this placement is the main structural feature that controls the product’s behaviour in addition-cure silicone systems.
The product is used where a reactive, low-viscosity silicone fluid is required to reduce compound viscosity without introducing extractable non-functional diluent. Its telechelic structure allows each molecule to participate in platinum-catalyzed hydrosilylation with Si-H functional crosslinkers, forming ethylene bridges between the chain end and the network. This distinguishes RH-Vi1303 from general-purpose methyl-terminated silicone oils of similar viscosity, which remain mobile after cure and can migrate to the surface. It also differs from multi-functional vinyl silicone oils that carry vinyl groups along the polymer backbone, because terminal placement favours chain extension and a more regular network architecture at a given vinyl content.
| Property | Method | Unit | Typical Value | Control Range |
|---|---|---|---|---|
| Appearance | Visual inspection | — | Clear, colorless | No visible haze or gel particles |
| Kinematic viscosity at 25 °C | ISO 3219 | mm²/s | 1,000 | 900–1,100 |
| Dynamic viscosity at 25 °C | Brookfield rotational viscometer | mPa·s | 970 | 870–1,070 |
| Vinyl content | Quantitative 1H NMR | mmol/g | 0.13 | 0.12–0.14 |
| Vinyl weight fraction | Calculated from vinyl content | wt% | 0.35 | 0.32–0.38 |
| Volatile content 2 h at 150 °C | ISO 3251 | wt% | 0.30 | ≤0.50 |
| Refractive index nD 25 °C | ASTM D1218 | — | 1.403 | 1.400–1.406 |
| Density at 25 °C | ISO 2811-1 | g/cm³ | 0.970 | 0.965–0.975 |
| Acid number | ISO 6618 | mg KOH/g | 0.02 | ≤0.05 |
| Water content | ISO 760 Karl Fischer | ppm | 80 | ≤150 |
Incoming resin qualification for RH-Vi1303 should include viscosity, vinyl content, volatile content, refractive index, density, acid number, and water content. The viscosity is measured at 25.0 °C using a cone-plate or coaxial-cylinder viscometer according to ISO 3219, with a shear rate of 100 s⁻¹ for dynamic measurement. The water content is controlled because residual moisture can hydrolyze platinum catalysts and interfere with filler treatment in downstream compounding. Acid number is monitored because low-molecular-weight acidic species from incomplete neutralization can inhibit addition cure and create corrosion on injection-molding barrels.
The primary structural difference between RH-Vi1303 and a methyl-terminated polydimethylsiloxane of similar viscosity is the terminal vinyldimethylsilyl group. A methyl-terminated fluid behaves as an inert diluent in an addition-cure network; because it lacks a covalent bond to the crosslinked siloxane phase, it can migrate to the surface over time, increase extractables, and reduce adhesion. In contrast, RH-Vi1303 participates in the hydrosilylation reaction with Si-H functional crosslinkers, forming ethylene bridges between the terminal silicon atom and the crosslinker. Each chain with two terminal vinyl groups acts as a telechelic chain extender; it is incorporated into the polymer network and is not removed by post-cure extraction under standard aqueous or solvent extraction protocols.
Compared with a multi-functional silicone oil containing pendant vinyl groups distributed along the backbone, RH-Vi1303 gives a more defined network architecture. Pendant vinyl groups introduce branch points that increase crosslink density at a given vinyl content, which raises hardness, modulus, and glass-transition temperature but tends to reduce elongation at break. Terminal vinyl groups, by contrast, extend the distance between crosslinks and preserve a more regular network, which supports higher elongation and greater tear resistance in soft formulations. The choice of terminal versus pendant vinyl is not a simple upgrade or downgrade; it is a formulation variable governed by the target stress–strain profile and the processing viscosity. At the same nominal vinyl content of 0.13 mmol/g, a pendant-vinyl fluid may yield a hardness increase of 5–12 points on the Shore A scale relative to RH-Vi1303 after the same platinum and hydride cure, depending on the crosslinker structure. Published comparative data for this specific configuration are limited, but the trend is consistent with rubber elasticity theory and with supplier-issued formulation guidance for liquid silicone rubber.
Against hydroxy-terminated polydimethylsiloxane, RH-Vi1303 avoids condensation-cure byproducts such as water or methanol, and it does not require moisture exposure to achieve cure. Hydroxy-terminated silicones are frequently used in room-temperature vulcanization; their cure depends on organotin or titanium catalysts and produces volatile condensation products that can cause dimensional change and odor. RH-Vi1303 is designed for addition-cure systems in which hydrosilylation releases no stoichiometric byproduct and linear shrinkage is typically lower than 0.1% when mold compensation is correct. This makes the vinyl-terminated fluid preferable in optical potting and precision casting where dimensional stability and low extractables are required.
In two-part liquid silicone rubber production, RH-Vi1303 is commonly introduced into the vinyl-functional base polymer phase to reduce viscosity before filler addition. The use of a 1,000 mm²/s reactive diluent lowers the plasticizing effect required from non-functional silicone oil and allows the mixer to reach a homogeneous silica dispersion with lower peak torque. Typical LSR compounding uses a planetary mixer or a twin-screw extruder with a length-to-diameter ratio of 40:1 to 60:1 and barrel sections held below 60 °C. When 20 wt% of the high-molecular-weight vinyl gum is replaced by RH-Vi1303, the compound viscosity can be reduced substantially, but the change in crosslink density must be compensated by increasing the hydride crosslinker addition to maintain the desired Si-H:Si-vinyl molar ratio. The usual hydride-to-vinyl molar ratio in silicone addition cure is maintained between 1.2:1 and 1.8:1; excess hydride beyond 2.0:1 can generate hydrogen off-gassing and increased hardness, while ratios below 1.0:1 produce an under-cured network with elevated compression set.
Injection molding experience on all-electric presses with clamp forces between 500 kN and 4,500 kN indicates that a mold temperature of 120 °C to 180 °C is normal for LSR, with cold-runner manifolds maintained below 40 °C to avoid premature gelation in the feed channel. Cure cycle times for thin-wall parts range from 5 s to 15 s per millimetre of wall thickness, with the exact value controlled by mold temperature, inhibitor concentration, and the Si-H:Si-vinyl ratio. When RH-Vi1303 is substituted for an equal weight of methyl-terminated dimethylsilicone fluid, the same machine settings ordinarily produce a cured article with improved oil resistance and lower surface exudation; however, the initial mixed viscosity changes because the reactive diluent is incorporated into the network rather than remaining as a mobile liquid. Specific processing-window trials are required for each mold, because published data for this product in a specific cavity geometry is limited.
Substitution of RH-Vi1303 for a methyl-terminated dimethylsilicone oil in a platinum-catalyzed potting gel changes the cured gel in three measurable respects. First, the extractable fraction after cure is lower because the terminal vinyl groups bind the fluid to the crosslinked network; non-reactive oil remains soluble and can be extracted by cyclohexane or toluene. Second, the gel firmness, expressed as penetration depth under a 9.4 g cone per ISO 2137, decreases when the same weight loading is used, because the terminal vinyl fluid acts as a chain extender rather than a non-functional plasticizer. Third, the mixed A/B viscosity may rise or fall not solely with the replacing fluid’s viscosity, but with the stoichiometric adjustment required by the hydride crosslinker. Formulators typically rebalance the formulation to keep the hydride-to-vinyl molar ratio within the same range; failure to do so can produce either a tacky surface or a brittle resin with reduced elongation.
Dielectric performance is also influenced by network incorporation. Non-functional silicone fluids can migrate and exude, creating a mobile liquid layer that attracts dust and changes surface resistivity. RH-Vi1303 does not migrate after complete cure, so the surface is more stable and the bulk dielectric properties are less affected by extraction. In applications requiring transparency, the terminal vinyl fluid is preferred because it remains copolymerized into the matrix and does not form microphase-separated droplets that scatter light. Haze measurements on cured elastomers can be performed according to ISO 14782; formulations containing a non-reactive diluent often show higher haze after thermal aging because of phase separation, while a reactive terminal-vinyl diluent does not drive the same separation mechanism. Comparative haze data for this specific product are limited and should be generated on the final formulation using the production mold surface.
In high-consistency rubber compounding, RH-Vi1303 is used at lower addition levels, usually below 10 phr, because its low molecular weight can reduce green strength and cause roll sticking on open two-roll mills. It is most effective when added after filler incorporation to avoid coating the silica surface before the silane treatment is complete. The fluid can be dispersed on a two-roll mill at a nip temperature below 50 °C; at higher temperatures, the viscosity of the fluid drops and the band may slip. In an internal mixer, the addition point should be after the fumed silica has been incorporated and the compound reaches a homogeneous paste, to prevent localized high-shear zones from generating free radicals that could initiate premature vinyl polymerization. Published data for this configuration are limited, but the processing caution is consistent with standard silicone rubber mixing practice.
Rheologically, RH-Vi1303 exhibits Newtonian behaviour over shear rates from 0.1 s⁻¹ to 500 s⁻¹ at 25 °C. The temperature dependence follows an Arrhenius-type flow activation energy of approximately 18 kJ/mol, similar to linear polydimethylsiloxanes of equivalent molecular weight. In filled systems, the fluid’s low molecular weight allows it to penetrate fumed silica aggregates and reduce the Payne effect after strain sweep. Cure behaviour can be followed by moving die rheometer at 150 °C and 0.5° oscillation amplitude according to ISO 6502. The torque rise begins when the platinum catalyst and inhibitor equilibrium shifts after thermal activation. At a platinum concentration of 5 ppm based on total compound, the time to 90% of maximum torque may fall below 30 s; at 1 ppm platinum, the same compound may require longer than 120 s. These values are formulation-dependent and must be confirmed in the production formulation because filler type, water content, and hydride crosslinker structure alter the cure profile.
Differential scanning calorimetry of the uncured fluid can be carried out per ISO 11357-1; the liquid itself exhibits a glass transition below −120 °C, typical for linear polydimethylsiloxane. The low glass transition contributes to low-temperature flexibility in cured materials, but the final low-temperature performance depends on crosslink density and filler. The product does not contain reinforcing filler, so mechanical properties are only relevant after compounding.
RH-Vi1303 is inhibited by the same contaminants that affect platinum-catalyzed hydrosilylation. Sulfur-containing materials, amines, phosphines, and organotin compounds should be excluded from storage and compounding equipment. When the fluid is used in a facility that also processes condensation-cure silicones, shared pumping lines and static mixers must be cleaned with a non-reactive solvent such as heptane or toluene and dried before the fluid is introduced. Residual amine-functional silane at levels above 0.01 wt% can suppress cure at the part surface and create a tacky skin. Moisture ingress should be limited because water hydrolyzes chloroplatinic acid catalysts and can accelerate viscosity drift in the presence of filler. Store in unopened stainless steel or fluorinated HDPE containers below 35 °C and avoid exposure to direct sunlight; the recommended shelf life from the date of manufacture is 24 months under these conditions.
For application testing, the product is typically evaluated as part of the A-component vinyl polymer phase, not as a standalone absorbent or lubricant. Analytical records for each batch include viscosity, vinyl content, volatile content, refractive index, density, acid number, and water content. Certificate-of-analysis data should be retained for full lot traceability. In the case of food-contact or medical use, the final cured article must be validated according to the relevant regulation or pharmacopeial chapter; the neat fluid datasheet does not itself constitute a food-contact certification.
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