| HS Code | 752428 |
| Productname | Vinyl Terminated Silicone Oil RH-Vi301 |
| Chemicalname | Vinyl-terminated polydimethylsiloxane |
| Casnumber | 68083-19-2 |
| Appearance | Colorless transparent liquid |
| Viscosityat25c | 300 mPa·s |
| Vinylcontent | 0.30 mmol/g |
| Densityat25c | 0.97 g/cm³ |
| Refractiveindexat25c | 1.405 |
| Volatilecontent | ≤1.0% |
| Flashpoint | ≥200 °C |
| Storagecondition | 5–30 °C, dry and sealed |
| Shelflife | 12 months |
As an accredited Vinyl Terminated Silicone Oil RH-Vi301 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Vinyl Terminated Silicone Oil RH-Vi301 is packaged in 25 kg polyethylene-lined steel drums, securely sealed and clearly labeled for safe industrial transport. |
| Container Loading (20′ FCL) | Vinyl Terminated Silicone Oil RH-Vi301 loaded in a 20-foot FCL container, securely packed for ocean shipment. |
| Shipping | Vinyl Terminated Silicone Oil RH-Vi301 is typically shipped in sealed steel drums or IBCs with proper labeling. Transport in dry, ventilated conditions away from heat, moisture, and strong oxidizers. Follow the SDS, carrier requirements, and applicable local dangerous-goods regulations. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers tightly closed when not in use. Protect from moisture, dust, and contamination. Keep away from strong oxidizers and incompatible materials. Avoid excessive heat and freezing. Follow local regulations and use first-in, first-out stock rotation. Inspect containers regularly for leaks or damage. |
| Shelf Life | Shelf life is typically 12 months from date of manufacture when stored unopened in a cool, dry place. |
Injection molding cells configured for addition-cure liquid silicone rubber derived from RH-Vi301 typically meter Part A and Part B through high-precision gear pumps into a static mixer containing 18–24 elements, after which the blend is injected through a cold runner into multi-cavity molds held at 120–180 °C. Cured articles in food-contact and medical end uses are qualification-tested under FDA 21 CFR 177.2600, ISO 10993-5:2009, and USP Class VI extraction protocols. A representative addition-cure formulation for automotive connector seals and respiratory valves contains 60–85 wt% RH-Vi301, 15–30 wt% fumed silica with BET surface area 150–300 m²/g, 2–10 ppm platinum catalyst, 0.02–0.10 wt% ethynylcyclohexanol inhibitor, and methylhydrogenpolysiloxane crosslinker sufficient for an Si–H:Si–Vi molar ratio of 1.2:1–1.8:1. On production-scale LSR molding machines with clamp force between 100 t and 400 t, cure time is typically 5–30 s per mm of wall thickness, but mold flash formation increases when injection pressure exceeds 80 MPa unless the parting line is vacuum-assisted. Molded component categories include automotive wire grommets, O-ring seals, infant bottle nipples, medical syringe stoppers, and anesthesia mask cushions. Operational limits include catalyst inhibition by organotin and sulfur residues from adjacent lines; tooling must be purged and segregated because a 10 ppm sulfur contamination can raise demolding tack to unusable levels.
RH-Vi301 is introduced in high-consistency silicone rubber as a reactive plasticizer to reduce compound Mooney viscosity and improve filler dispersion prior to vulcanization. At addition levels of 5–20 phr, the fluid lowers uncured Mooney ML(1+4) at 100 °C by 10–30 units under ASTM D1646-19a, but above 30 phr the tensile strength in vulcanizates tested under ASTM D412-16 declines because the short-chain vinyl fluid acts as a network diluent. Compliance for cable insulation and automotive underhood parts includes IEC 60216-1 thermal endurance evaluation, ISO 37:2017 tensile properties, and ASTM D2240-15 Shore A hardness. Production on a two-roll mill uses a nip gap of 0.5–2.0 mm with roll temperatures held below 50 °C to prevent premature addition cure; internal mixers require jacket temperatures of 35–55 °C and rotor speeds of 20–50 rpm. Extrusion of profiles and tubing is performed on screws with L/D ratios from 20:1 to 30:1, followed by hot-air vulcanization at 250–400 °C for continuous lengths. Continuous vulcanized profiles and tubing feed product families such as spark plug boots, oven door gaskets, braided fuel-hose covers, and medical grade tubing. Batch-to-batch variance documented on production lines shows that vinyl fluid addition above 25 phr can increase die swell, requiring screw speed reductions of 10–20 %.
The principal limitation in power module encapsulation is not the thermal stability of the cured polydimethylsiloxane network but the retention of electrical insulation after exposure to thermal shock and condensation cycling. Formulations based on RH-Vi301 are filled with spherical alumina or boron nitride at 30–60 wt% to achieve thermal conductivity above 1.5 W/(m·K) while maintaining flowability for penetration into wire-bonded substrates. Compliance for traction inverter and onboard charger assemblies requires UL 94 V-0 at 2.0 mm thickness, ASTM E595-15 total mass loss below 1.0 % and collected volatile condensable material below 0.1 %, IEC 60068-2-14 thermal shock from −40 °C to 150 °C, and IPC-TM-650 method 2.6.61 for surface insulation resistance. A production-dispensed formulation contains 40–70 wt% RH-Vi301, 30–60 wt% filler, 2–15 ppm platinum catalyst, 0.01–0.10 wt% cyclic methylvinylsiloxane inhibitor, and crosslinker to give 1.0:1–1.6:1 Si–H:Si–Vi. Mixing in a planetary vacuum mixer at −0.09 MPa for 30–60 min removes air before dispensing; cure schedules of 80 °C for 30 min followed by 150 °C for 60 min prevent exothermic void formation in sections exceeding 10 mm. Potting and encapsulation lines convert this formulation into IGBT module potting, SiC metal-oxide-semiconductor field-effect transistor encapsulants, automotive DC-DC converter housings, and solar inverter junction boxes. The process window narrows if silicone surfaces contact residual solder flux containing amine activators; platinum catalyst poisoning appears as gelation failure at the interface and cannot be corrected by extending cure time.
Solventless addition-cure release coatings based on RH-Vi301 are processed on five-roll, offset gravure, or multi-roll transfer coaters to deposit 0.8–1.6 g/m² coat weight on corona-treated polyethylene terephthalate film, glassine paper, or polyolefin-coated kraft. Compliance for food-contact release liners references FDA 21 CFR 175.320, BfR Recommendation XV, Regulation (EC) No 1935/2004, and Regulation (EC) No 2023/2006; non-food liner converters may also require EN 71-3 extractable-metal compliance. The coating bath is formulated with 100 parts RH-Vi301, 1.5–4.0 parts methylhydrogen crosslinker, 0.5–1.5 parts 1-ethynyl-1-cyclohexanol inhibitor, and 50–150 ppm platinum catalyst. Thermal cure is conducted at 120–180 °C with dwell times of 1.5–3.0 s, allowing web speeds between 300 m/min and 600 m/min on production coaters. The coating is converted into pressure-sensitive label release liners, adhesive tape backings, hygiene article release wraps, and graphic film premask liners. Trustworthy operation requires controlling paper moisture below 6 % because water release during cure generates blisters; coated substrates with amine-containing inks must be barrier-coated prior to silicone application, otherwise platinum catalyst poisoning reduces anchorage and increases silicone transfer to adhesive under aging.
For closed-cell silicone foam produced from RH-Vi301, the blowing mechanism is an in situ addition-cure reaction driven by the reaction between Si–H crosslinker residues and hydroxyl-containing components, or by adding 1–5 wt% physical blowing agent with activation between 70 °C and 120 °C. The formulation contains 100 parts RH-Vi301, 2–8 parts methylhydrogenpolysiloxane, 5–20 ppm platinum catalyst, 10–25 parts fumed silica, 0.05–0.3 wt% inhibitor, and 1–5 wt% blowing agent. Compliance for electric vehicle battery pack thermal insulation and rail interior gaskets includes UL 94 V-0 at 3.0 mm thickness, ASTM D1056-14 classification for closed-cell cellular rubber, FMVSS 302 horizontal burn rate, and EN 45545-2 hazard level. Production is typically performed on meter-mix dispense equipment feeding closed molds at 70–120 °C; mold pressure is maintained above 0.2 MPa to prevent cell coalescence, and demolding before 10–20 min causes partial collapse in skins. Molded foam components produced in this grade include prismatic cell compression pads, module thermal runaway barriers, charging connector seals, and anti-vibration gaskets. Batch-to-batch variance is most sensitive to moisture uptake in fumed silica: at relative humidity above 60 %, pre-drying for 4 h at 150 °C is required to prevent premature hydrogen release and density variation exceeding 15 %.
Coated fabrics for airbags, expansion joints, and conveyor belts are manufactured by knife-over-roll, dip coating, or direct gravure application of an addition-cure silicone compound in which RH-Vi301 is the base fluid. Compliance for these end uses includes ISO 3795 flammability, EN 45545-2 for rail vehicle interiors, NFPA 701 for flame propagation, and DIN 4102-1 for building material class; airbag fabrics additionally require low gas permeability and high tear strength tested under ISO 13934-1 and ASTM D5587-15. A typical knife-coating formulation includes 100 parts RH-Vi301, 15–35 parts fumed silica, 5–15 parts methyl silicone resin, 0.5–2.0 wt% adhesion promoter, 5–15 ppm platinum catalyst, and Si–H crosslinker to maintain 1.2:1–1.7:1 Si–H:Si–Vi. Application is controlled by coating gap settings of 0.1–1.0 mm, line tension between 50 N and 500 N depending on fabric width, and oven zone temperatures from 140 °C to 200 °C with residence times of 3–10 min. Coated laminate outputs include airbag base fabrics, flue gas expansion joints, high-temperature conveyor belts, and fire-resistant blankets. The operational boundary appears at coating thickness above 2.0 mm, where uneven exotherm in the curing oven can produce surface blistering and internal porosity that reduce hydrostatic resistance under ISO 811.
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Vinyl Terminated Silicone Oil RH-Vi301 is a linear α,ω-divinyl-functional polydimethylsiloxane fluid supplied as a clear, colorless to light-straw liquid. The telechelic vinyl groups participate in platinum-catalysed hydrosilylation with methylhydrogen siloxane crosslinkers rather than condensation cure. Manufacturer release data list a kinematic viscosity of 300 mm²/s at 25 °C when tested per ASTM D445-21a, a refractive index of 1.4030–1.4050 at 25 °C per ASTM D1218-21, and a density of 0.965–0.975 g/cm³ at 25 °C per ASTM D4052-22. Vinyl content is reported as 0.22–0.28 mmol/g by iodometric titration; for a difunctional telechelic structure, this corresponds to a calculated number-average molecular weight of approximately 9,000–11,000 g/mol. The CAS registry number associated with the divinyl-terminated polydimethylsiloxane class is 68083-19-2; end-use regulatory status must be confirmed against the specific formulation because catalysts, inhibitors, and crosslinkers are not covered by the fluid classification alone.
Typical batch data are not specification limits. Release limits may vary by lot and should be obtained from the certificate of analysis. The table below summarizes the manufacturer-listed property window.
| Property | Typical Value | Test Method |
|---|---|---|
| Appearance | Clear, colorless to light-straw liquid | Visual inspection at 25 °C |
| Kinematic viscosity | 300 mm²/s at 25 °C | ASTM D445-21a |
| Vinyl content | 0.22–0.28 mmol/g | Iodometric titration |
| Volatile content | ≤0.50 % after 3 h at 150 °C | ISO 3251:2019 |
| Refractive index | 1.4030–1.4050 at 25 °C | ASTM D1218-21 |
| Specific gravity | 0.965–0.975 at 25 °C | ASTM D4052-22 |
| Moisture content | ≤200 ppm | ISO 760:1978 |
The Newtonian viscosity of RH-Vi301 at 25 °C is reported as 300 mm²/s. At elevated processing temperatures, viscosity decreases in a manner consistent with linear polydimethylsiloxane fluids. At 50 °C shear viscosity is approximately 180 mm²/s, and at 100 °C it falls below 80 mm²/s when measured with a rotational rheometer per ISO 3219:2021. The surface tension is typically 21–22 mN/m at 25 °C per ASTM D1331-20, which supports wetting of glass, metal, and mineral filler surfaces. These flow characteristics permit lower dispense pressure and faster cavity fill in heated molds while maintaining sufficient chain length for low modulus after cure.
In hydrosilylation-cure formulations, RH-Vi301 is compounded with a methylhydrogen siloxane crosslinker, a Karstedt-type platinum catalyst at 5–20 ppm Pt based on total compound weight, and an inhibitor such as 1-ethynylcyclohexanol at 50–150 ppm. The recommended Si-H:Si-Vi molar ratio lies between 1.2:1 and 1.8:1; ratios below 1.1:1 yield under-cured surfaces with elevated extractables, while ratios above 2.2:1 increase hydrogen evolution and reduce elongation at break. Cure can be carried out at 120 °C for 10 min in a forced-convection oven, or at 80 °C for 30 min for temperature-sensitive substrates. Pot life at 25 °C can be adjusted from 4 h to 24 h by inhibitor concentration.
On production-scale liquid silicone rubber equipment, RH-Vi301-based compounds are processed with barrel cooling at 25–30 °C, cold-runner manifold temperatures below 40 °C, and mold temperatures between 150 °C and 170 °C. Thin-wall parts with nominal wall thickness 0.8 mm require mold temperature variation within ±5 °C; deviations below 145 °C extend cure time and can produce short shots, while deviations above 175 °C consume inhibition before cavity fill is complete. Clamp force is selected from projected area at 0.5–1.0 kN/cm². In high-consistency rubber compounding, the fluid is injected into barrel zone 3 of a co-rotating twin-screw extruder with L/D 44:1 to reduce silica wetting time and lower mixing torque. Filled LSR compounds are typically prepared with fumed silica at 10–30 phr; high-shear dispersion is performed in a planetary mixer at 60–80 rpm for 45–90 min under vacuum at −0.09 MPa. The resulting compound exhibits shear-thinning behavior with a viscosity drop from 150,000 mPa·s at 0.1 s⁻¹ to 20,000 mPa·s at 10 s⁻¹ when tested per ISO 3219:2021.
In potting and encapsulation applications, RH-Vi301 is often used as a base fluid with quartz or alumina fillers at 40–60 phr. The low viscosity of the unfilled fluid permits degassing at −0.095 MPa for 20–30 min before filler addition. Dispensing through static mixers with 16–32 elements at 25–35 °C produces homogeneous two-component mixtures; pressure at the dispense nozzle is typically maintained below 0.4 MPa to avoid cavitation. For optically clear bonding, RH-Vi301 is selected over higher volatile grades because volatile siloxane fractions can condense on optical surfaces. Unfilled 2 mm films cured from RH-Vi301 show light transmittance above 90 % in the visible range when tested per ASTM D1003-21; haze remains below 5 % when the fluid is filtered through a 0.45 µm membrane before cure. These values are typical manufacturer data rather than acceptance limits.
Because RH-Vi301 carries vinyl functionality at both polymer chain ends, the hydrosilylation network develops primarily through chain extension rather than dense pendant crosslinking. This topology produces lower modulus elastomers at equivalent Si-H:Si-Vi molar ratios compared with fluids containing pendant vinyl groups. When unfilled cast films are prepared with 4.0 g of trimethylsiloxy-terminated methylhydrogen siloxane per 100 g of RH-Vi301 and cured at 120 °C for 10 min, tensile properties tested according to ASTM D412-16 typically show elongation at break above 300 %; hardness measured per ASTM D2240-15 remains below 20 Shore A. These values reflect a chain-extended network rather than a highly crosslinked structure.
Replacement of RH-Vi301 by a pendant vinyl silicone fluid of similar viscosity produces a measurable increase in crosslink density. In a formulation with 1.6:1 Si-H:Si-Vi ratio, the pendant fluid typically raises Shore A hardness by 8–15 points and lowers elongation at break by 40–60 % relative to the terminal fluid, when cured as 2 mm sheets and tested per ASTM D412-16 and ASTM D2240-15. These effects arise from the higher average number of vinyl groups per chain and the resulting elastically active subchains. Published data for this specific configuration is limited; the ranges should be confirmed by design of experiments on the target formulation.
Unlike trimethylsilyl-terminated non-functional silicone oils, RH-Vi301 is covalently bound into the siloxane network during cure. This reduces the solvent-extractable fraction after post-cure. Extraction testing per ISO 6427:2013 on cured 2 mm sheets shows soluble fractions below 3 % when the Si-H:Si-Vi ratio is maintained above 1.2:1 and post-cure is conducted at 150 °C for 4 h. Non-functional silicone oils of equivalent viscosity can remain largely extractable and migrate to the surface. Unlike hydroxy-terminated polydimethylsiloxane fluids, RH-Vi301 does not require tin or titanium condensation catalysts and does not release methanol or ethanol during cure.
Thermogravimetric analysis of neat RH-Vi301 at 10 °C/min under nitrogen indicates 5 % mass loss above 350 °C when tested per ISO 11358-1:2022. The cured network typically exhibits comparable or slightly lower decomposition onset because crosslinker residues and platinum catalyst influence degradation kinetics. High-temperature exposure above 200 °C in air leads to progressive reversion and embrittlement; continuous-use temperature should be qualified per end-use requirements.
The selection between RH-Vi301 and adjacent vinyl-terminated silicone oil grades is governed by viscosity, volatile content, and vinyl concentration. Kinematic viscosity is determined per ASTM D445-21a; volatile content is determined per ISO 3251:2019; vinyl content is determined by iodometric titration. The table below lists manufacturer-listed typical values for comparative grades.
| Product | Kinematic Viscosity at 25 °C | Vinyl Content | Volatile Content | Typical Use |
|---|---|---|---|---|
| RH-Vi100 | 100 mm²/s | 0.45–0.55 mmol/g | ≤1.00 % | Release coatings, sprayable encapsulants |
| RH-Vi301 | 300 mm²/s | 0.22–0.28 mmol/g | ≤0.50 % | Liquid silicone rubber, potting, optical bonding |
| RH-Vi500 | 500 mm²/s | 0.18–0.24 mmol/g | ≤0.50 % | High-tear elastomers |
| RH-Vi1000 | 1000 mm²/s | 0.12–0.18 mmol/g | ≤0.50 % | High-consistency rubber base, high-green-strength formulations |
Compared with RH-Vi100, RH-Vi301 exhibits lower volatile content and a higher molecular weight, which reduces shrinkage in thick-section parts and lowers the risk of outgassing in optically clear bonding. Compared with RH-Vi500 and RH-Vi1000, RH-Vi301 maintains lower mixing viscosity and better flow through static mixers and narrow dispense needles, while still providing sufficient chain length for low modulus and high elongation. The terminal vinyl architecture remains constant across the series; only chain length and end-group concentration shift.
RH-Vi301 should be stored in an originally sealed container at 5–30 °C and protected from direct sunlight. Under these conditions the manufacturer-listed shelf life is 12 months from the date of certification. Exposure to ambient humidity above 60 % increases moisture uptake; pre-drying of the fluid or of silica fillers at 120 °C for 2 h is required when moisture content exceeds 200 ppm per ISO 760:1978. The fluid is incompatible with amine-based additives, organotin compounds, sulfur-containing accelerators, and strong acids; these substances poison platinum catalysts or promote premature gelation. Formulations containing excess Si-H and residual moisture can evolve hydrogen during storage and create foam or pressure build-up in sealed containers. Compliance with FDA 21 CFR 177.2600 may be available for the fluid as supplied; however, end-use formulations must be tested for specific food-contact conditions because catalysts, inhibitors, and crosslinkers are not covered by the fluid compliance statement.
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