| HS Code | 724067 |
| Productname | Vinyl Terminated Silicone Oil RH-Vi1311 |
| Chemicalname | Vinyl-terminated polydimethylsiloxane |
| Casnumber | 68083-19-2 |
| Appearance | Colorless transparent liquid |
| Color | Colorless |
| Odor | Odorless |
| Viscosity | 1000 mPa·s at 25°C (typical) |
| Vinylcontent | 0.13 mmol/g (typical) |
| Density | 0.97 g/cm³ at 25°C (typical) |
| Refractiveindex | 1.404 at 25°C (typical) |
| Volatilecontent | ≤2.0% at 150°C for 3 h |
| Flashpoint | >200°C |
| Watersolubility | Insoluble |
| Solubility | Soluble in toluene, xylene, hexane, and other common organic solvents |
| Reactivity | Cures via hydrosilylation with Si-H compounds |
| Thermalstability | Stable under normal storage and processing conditions |
As an accredited Vinyl Terminated Silicone Oil RH-Vi1311 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged as Vinyl Terminated Silicone Oil RH-Vi1311 in 25 kg HDPE drums with sealed inner liners and clear hazard labels. |
| Container Loading (20′ FCL) | A 20-foot FCL container loaded with Vinyl Terminated Silicone Oil RH-Vi1311, securely packed and sealed for ocean freight. |
| Shipping | Vinyl Terminated Silicone Oil RH-Vi1311 is typically shipped in sealed steel drums or IBCs at ambient temperature. It is generally non-hazardous and not regulated for transport. Protect containers from moisture, contamination, direct sunlight, and extreme temperatures; handle according to the SDS. |
| Storage | Store Vinyl Terminated Silicone Oil RH-Vi1311 in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers tightly closed to prevent moisture and contamination. Store separately from strong oxidizers and incompatible materials. Protect from freezing and physical damage. Maintain good housekeeping and label containers clearly. Use appropriate secondary containment where required. |
| Shelf Life | Shelf life is 12 months from date of manufacture when stored unopened in a cool, dry, well-ventilated place away from sunlight. |
Platinum-catalyzed addition-cure liquid silicone rubber compounding with vinyl-terminated silicone oil RH-Vi1311 begins with a static or dynamic mixing step that combines the vinyl-functional base fluid, a methylhydrogen siloxane crosslinker, fumed silica, and a platinum catalyst. The SiH:SiVi molar ratio is maintained between 1.2:1 and 1.8:1 on production lines; below 1.0:1 the cured part retains surface tack due to unreacted vinyl groups, while above 2.2:1 hydrogen gas release during post-cure creates voids that are detectable under ASTM D792 as a density reduction. Typical vinyl contents for this class of base fluid fall between 0.10 mmol/g and 0.30 mmol/g, and formulators adjust the crosslinker concentration accordingly. Platinum catalyst is added at 5–15 ppm Pt relative to total compound mass, and 50–150 ppm of 1-ethynyl-1-cyclohexanol is used as an inhibitor to extend pot life at 25 °C to 8–48 h. On an electric injection molding machine with a cooled screw of 18:1 L/D and barrel zones held at 20–30 °C, the compound is injected at 50–120 bar into molds heated to 120–180 °C; cycle times of 30–90 s are common for wall sections from 2 mm to 10 mm. Cured elastomer tensile strength is measured under ISO 37 or ASTM D412, tear strength under ASTM D624 die C, and compression set under ISO 815-1 after 22 h at 175 °C. Automotive connector seals and grommets made from this compound are specified with compression set below 20% and hardness between 50 Shore A and 70 Shore A when tested to DIN 53505; these values are reached only when the molded part receives a post-cure of 4 h at 200 °C in a forced-air oven. Production failure modes include scorch in the cooled barrel when the inhibitor concentration falls below 30 ppm, and gas bubbles in thick sections when cavity pressure during injection drops below 10 bar.
During vacuum blending for high-voltage IGBT module potting, vinyl-terminated silicone oil RH-Vi1311 is combined with fumed silica and aluminum oxide or boron nitride fillers in a planetary mixer operating at 10–50 mbar absolute pressure. Filler loading is normally held between 40 wt% and 75 wt% to balance thermal conductivity and flow; the resulting thermal conductivity ranges from 0.8 W/(m·K) to 3.0 W/(m·K) when measured by the transient plane source method under ISO 22007-2. Mixed viscosity for narrow-gap dispensing is specified below 5,000 mPa·s at 25 °C and 10 s⁻¹ shear rate, measured with a rotational rheometer under ISO 3219 or ASTM D2196. Pot life is not determined by ambient humidity because addition-cure silicones do not release condensation by-products; instead, productivity is limited by catalyst poisoning from residual sulfur compounds, amines, or organotin stabilizers on uncleaned substrates. Such contamination can extend cure time beyond the allowed 60 min at 80 °C and is a frequent cause of tacky surfaces in production. Deep-section cure follows a staged thermal profile of 80 °C for 30 min followed by 150 °C for 2 h, because thermal transport through the filled silicone mass controls the cure rate rather than oxygen inhibition. Dielectric strength of the cured encapsulant must exceed 18 kV/mm on 2 mm plaques under IEC 60243-1, and volume resistivity above 1 × 10¹⁴ Ω·cm is often required after 168 h at 85 °C/85% RH. Compounds formulated with RH-Vi1311 meet RoHS Directive 2011/65/EU restrictions for electrical and electronic equipment when filler and pigment selections exclude restricted heavy metals. In service, unreacted hydride groups become a risk if the SiH:SiVi ratio exceeds 2.0:1, because hydrogen evolution during thermal aging produces voids that ultrasonic scanning acoustic microscopy detects at the die-attach interface.
If coating weight control on a five-roll solventless release coater drifts below 0.8 g/m², the cured film thickness approaches the particle size of undispersed silica or matting agents, and streak formation becomes visible on polyester or polypropylene substrates. Solventless silicone release coatings prepared from vinyl-terminated silicone oil RH-Vi1311 are processed at line speeds from 200 m/min to 600 m/min, with coating head temperatures maintained at 30–45 °C to keep viscosity within 200–1,000 mPa·s under low shear. The formulation includes a hydrogen-functional crosslinker and a platinum catalyst at 50–120 ppm Pt; cure is initiated in a heated oven section with air temperatures between 120 °C and 180 °C. Online coating weight sensors with 2–5% repeatability are required to detect drift before backside transfer occurs, because incomplete vinyl conversion below 95% leaves reactive species that migrate into the pressure-sensitive adhesive. Peel release force is measured by FINAT Test Method 3 or ISO 8510-1 at a 180° peel angle and 300 mm/min peel speed; typical values range from 10 cN/25 mm to 80 cN/25 mm, depending on crosslinker index and cure dose. When the laminate is intended for indirect food contact, the cured coating is formulated to comply with FDA 21 CFR 177.2600, and total migration is evaluated under EU Regulation 10/2011 with a limit below 10 mg/dm². Residual platinum must be minimized to avoid exceeding the specific migration limits applicable to the final article. A production-scale failure mode is backside transfer to the pressure-sensitive adhesive when the post-cure conversion of vinyl groups is below 95%; conversion is quantified by Fourier transform infrared spectroscopy using the vinyl absorption band near 1,590 cm⁻¹.
Extrusion-grade silicone compounds based on RH-Vi1311 are processed on twin-screw lines where the fluid is combined with fumed silica, precipitated silica, or calcium carbonate in a kneader and then fed to a twin-screw extruder with 40:1 L/D and barrel zones set between 80 °C and 160 °C. Screw speed is normally limited to 100–250 rpm because local temperatures above 200 °C consume the inhibitor package and cause premature crosslinking in the barrel. Die swell in extruded seals, tubing, and wire jacketing is controlled by maintaining the SiH:SiVi molar ratio between 1.3:1 and 1.6:1; below this window the melt exhibits high elasticity and dimensional variation, while above it the elongation at break falls below 300% under ISO 37. The extruded profile passes through a hot-air vulcanization oven with zone temperatures of 300–450 °C and residence times of 1–5 min; sections thicker than 5 mm require multiple oven zones and a post-cure drum at 200 °C for 4 h to remove volatile cyclic siloxanes. Hardness is adjusted from 40 Shore A to 80 Shore A by changing silica loading or crosslinker index and is measured under DIN 53505. In automotive radiator seals and oven door gaskets, the cured profile must demonstrate compression set below 30% after 70 h at 150 °C under ISO 815-1, and must retain at least 80% of original tensile strength after 1,000 h in a 225 °C air-circulating oven per ASTM D573. The processing boundary is strict: sulfur-vulcanized rubber residues or amine-containing release agents must not enter the same extruder, because sulfur and amines poison the platinum catalyst and produce inconsistent cure in subsequent batches.
For optical coupling layers between display panels and cover glass, transparent silicone gels prepared from vinyl-terminated silicone oil RH-Vi1311 are cast into a cavity after blending with a branched hydride crosslinker and a platinum catalyst at 3–10 ppm Pt. The gel is cured at 80 °C for 30 min, followed by a 25 °C post-cure for 24 h to stabilize optical properties. Refractive index is typically 1.40–1.42 at 589 nm under ISO 489 refractometry, and light transmittance through a 2 mm layer exceeds 90% in the visible range when aromatic additives are absent. Penetration values measured with a quarter-scale cone under ISO 2137 fall between 50 and 150 (0.1 mm), allowing the material to absorb vibration without transferring excessive stress to solder joints or adhesive interfaces. In lithium-ion battery module assembly, the same gel chemistry is dispensed into module gaps of 1–5 mm and cured to a soft solid with elongation at break above 200% under ISO 37; the layer provides vibration isolation and a secondary moisture-ingress barrier when sealed with an additional structural adhesive. The principal incompatibility is with condensation-cure silicone residues or acid-containing flux cleaners, which cause localized tackiness and reduced adhesion to aluminum or FR-4 substrates. Published data for long-term optical clarity of this specific vinyl-terminated fluid in outdoor photovoltaic junction boxes is limited, so accelerated weathering under ASTM G155 is recommended when exterior exposure is anticipated.
In cleanroom dipping operations for balloon catheters, vinyl-terminated silicone oil RH-Vi1311 is compounded with a hydride crosslinker at an SiH:SiVi molar ratio of 1.2:1 to 1.7:1 and a platinum catalyst level below 10 ppm Pt to minimize leachable metal content. The addition-cure system avoids peroxide decomposition residues that would complicate biological evaluation. Cure is carried out in a cleanroom tunnel oven at 120–150 °C for 10–20 min, followed by forced post-cure at 200 °C for 4 h under filtered air to reduce volatile siloxane residues. Wall thickness of the dipped balloon is controlled between 0.05 mm and 0.30 mm and measured by confocal laser scanning microscopy; tensile strength above 7 MPa and elongation at break above 400% under ISO 37 are typical specifications. The cured elastomer must demonstrate compliance with USP Class VI and ISO 10993-5 cytotoxicity, ISO 10993-10 skin sensitization, and ISO 10993-11 subacute systemic toxicity before clinical use. Adhesion to stainless steel dipping mandrels is prevented by a fluoropolymer coating, and the solventless formulation removes the need for explosion-proof drying ovens. A known operational boundary is that pot life drops below 4 h at ambient temperatures above 30 °C, so mixing vessels are jacketed at 15–20 °C in high-output lines.
| Application | Test method / standard | Typical acceptance window |
|---|---|---|
| LSR automotive connector seals | ISO 815-1 | Compression set ≤ 20% after 22 h at 175 °C |
| IGBT module potting | IEC 60243-1 | Dielectric strength ≥ 18 kV/mm on 2 mm plaques |
| Solventless release coating | FINAT Test Method 3 | Peel force 10–80 cN/25 mm at 300 mm/min |
| Medical balloon | ISO 10993-5 | Cytotoxicity ≥ 70% viability |
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Vinyl Terminated Silicone Oil RH-Vi1311 is a linear α,ω-divinyl polydimethylsiloxane corresponding to CAS 68083-19-2. Each chain terminus carries a vinyldimethylsilyl group, while the internal siloxane repeat units remain unreactive. This terminal placement allows the fluid to function as a bifunctional monomer in platinum-catalyzed hydrosilylation, producing elastomeric networks with a uniform mesh size when combined with poly(methylhydrosiloxane) crosslinkers. The product is supplied as a clear liquid and is used primarily in addition-cure liquid silicone rubber, transparent encapsulants, and flexible mold compounds. In relation to methyl-terminated polydimethylsiloxanes of similar viscosity, RH-Vi1311 is a reactive network former rather than a non-reactive lubricant; in relation to side-chain vinyl fluids, it avoids high-density crosslink clusters because vinyl functionality is confined to the chain ends.
The viscosity grade most commonly associated with RH-Vi1311 is 1000 mm²/s at 25 °C. This viscosity is low enough to permit high filler loading without solvent and high enough to provide acceptable green strength after injection molding. Batch acceptance is controlled by the manufacturer’s certificate of analysis. Where this document is not available, the class-typical envelope in Table 1 should not be treated as a batch guarantee.
Table 1 lists representative limits and test designations for α,ω-vinyl-terminated polydimethylsiloxane supplied at a nominal kinematic viscosity of 1000 mm²/s at 25 °C. Batch-specific values for RH-Vi1311 may be tighter than these ranges.
| Property | Typical Range or Limit | Test Designation |
|---|---|---|
| Appearance | Colorless transparent liquid | Visual inspection |
| Kinematic viscosity at 25 °C | 900–1100 mm²/s | ASTM D445 |
| Terminal vinyl content | 0.07–0.12 mmol/g | Iodometric titration, manufacturer method |
| Volatile matter at 150 °C for 3 h | ≤ 1.0 % | Gravimetric manufacturer method |
| Refractive index at 25 °C | 1.403–1.407 | ASTM D1218 |
| Density at 25 °C | 0.970–0.975 g/cm³ | ASTM D4052 |
| Total acidity | ≤ 0.01 mg KOH/g | ASTM D974 modified for silicone |
The terminal vinyl window of 0.07–0.12 mmol/g is critical for stoichiometric control. At the lower boundary, more Si-H crosslinker is required to reach the same Si-H:Si-Vi ratio; at the upper boundary, the same formulation can shift to a tighter network and reduce elongation at break. Batch titration is therefore performed before high-speed LSR compounding.
If the certificate of analysis for RH-Vi1311 is not accessible, the values above should be regarded as class-typical, not as batch-specific guarantees. Published data for this specific configuration is limited; therefore, formulation trials should use laboratory-scale batches before production compounding.
During platinum-catalyzed hydrosilylation, the terminal vinyl groups of RH-Vi1311 undergo addition across the silicon-hydride bonds of a poly(methylhydrosiloxane) crosslinker. Karstedt platinum(0) complex is typically added at 1–10 ppm platinum by mass; mold temperatures of 120–180 °C then permit injection-molding cycle times below 60 s. Because the reaction is exothermic and begins slowly at ambient temperature, inhibitor packages such as 1-ethynyl-1-cyclohexanol are used to extend pot life. The low viscosity of the 1000 mm²/s grade allows fumed silica loadings of 20–35 wt% to be dispersed by planetary mixer or twin-screw extruder without solvent.
On a co-rotating twin-screw extruder with L/D 40:1, initial barrel zones are held below 60 °C to avoid premature hydrosilylation. The final zone may be raised to 80 °C only after the inhibitor has been fully distributed. Field-scale experience with this viscosity grade indicates that a batch-to-batch terminal vinyl variation of ±0.005 mmol/g is sufficient to shift the stoichiometric Si-H:Si-Vi ratio; the correction is made by adjusting the Si-H crosslinker feed rate rather than by changing catalyst level. This approach prevents unintended changes in gel time and avoids the high scrap rates observed when catalyst concentration is used as the primary adjustment variable.
Because the 1000 mm²/s base fluid is Newtonian at low shear, the filled compound develops thixotropy mainly from the fumed silica network. Rheometer data obtained with a capillary rheometer at 25 °C typically show a shear-thinning index that depends on silica surface treatment. In injection molding, barrel residence time is kept below 10 min at 30–40 °C to prevent inhibitor depletion; longer residence times allow the platinum catalyst to become active and can produce scorch in the check ring and screw flights.
Two-component metering systems with static mixers require a pressure drop below 8 MPa at 25 °C for steady dispensing. If terminal vinyl content is near the upper boundary, the viscosity of the uncured mixed compound may remain acceptable, but the faster gel time reduces the working window. The system is therefore optimized by adjusting the inhibitor package rather than by diluting the base polymer with non-reactive silicone oil, which would migrate to the surface during cure and create tack.
RH-Vi1311 is not designed for tin- or titanium-catalyzed condensation curing. In condensation systems based on hydroxyl-terminated polydimethylsiloxane or alkoxy silanes, the terminal vinyl groups remain largely inert and do not form a sufficient network; the fluid therefore acts as a plasticizer or unreacted diluent. The platinum catalyst used for hydrosilylation is poisoned by amines, mercaptans, organotin compounds, strong acids, and strong bases at part-per-million concentrations. Formulations containing RH-Vi1311 must avoid contact with sulfur-vulcanizing agents, amine-based epoxy hardeners, and tin condensation catalysts. The fluid should be stored in sealed containers under nitrogen. Exposure to humidity above 60 % RH does not hydrolyze terminal vinyl groups rapidly, but moisture can deactivate platinum complexes and contribute to haze in optical encapsulants.
A direct comparison of reactive silicone fluids clarifies the selection boundary for RH-Vi1311. Table 2 compares the terminal vinyl architecture with side-chain vinyl and hydroxy-terminated fluids of similar viscosity.
| Parameter | RH-Vi1311 terminal vinyl PDMS | Side-chain vinyl PDMS | Hydroxy-terminated PDMS |
|---|---|---|---|
| Reactive group position | Both chain terminii | Pendent along the siloxane chain | Both chain terminii |
| Cure mechanism | Platinum-catalyzed hydrosilylation | Platinum-catalyzed hydrosilylation | Tin- or titanium-catalyzed condensation |
| Byproduct | None | None | Water, methanol, or ethanol |
| Network regularity | Uniform mesh, lower crosslink density | Clustered crosslinks, higher crosslink density | Broad mesh, moisture-dependent |
| Typical selection | Optical encapsulants, flexible LSR, mold compounds | High-hardness LSR, release coatings, tear-resistant elastomers | RTV sealants, caulks, room-temperature adhesives |
The terminal vinyl architecture of RH-Vi1311 provides lower crosslink density at equivalent total vinyl content than a side-chain vinyl fluid of identical vinyl concentration. Cured formulations based on RH-Vi1311 therefore favor higher elongation at break and lower Shore A hardness, while side-chain vinyl fluids are selected when tensile strength and tear resistance must be maximized. Hydroxy-terminated fluids release volatiles during condensation cure, which can produce shrinkage values exceeding 1–2 %; hydrosilylation of RH-Vi1311 proceeds without volatile generation, an advantage in optical encapsulants subjected to thermal cycling per IEC 60068-2-14.
When terminal vinyl content is increased from 0.07 mmol/g to 0.35 mmol/g at constant Si-H:Si-Vi ratio, the average molecular weight between crosslinks decreases by the same factor. In toluene swelling tests conducted according to ASTM D471, the equilibrium volume swell ratio drops and the calculated crosslink density rises. A 1000 mm²/s terminal vinyl fluid with 0.11 mmol/g vinyl can produce a soft elastomer in the Shore A 10–20 range, whereas a 0.35 mmol/g terminal vinyl fluid of lower viscosity can shift the cured network to Shore A values above 60. This property cliff-edge requires reformulation of inhibitor level and mold temperature; below 0.07 mmol/g, cure may remain incomplete, and above 0.35 mmol/g, the uncured compound may exhibit excessive stringiness and higher pressure drop in static mixers.
The glass transition temperature of the cured network remains below −120 °C as measured by ASTM E1356, regardless of the terminal vinyl content in this range, because the siloxane backbone dominates segmental motion. However, the low-temperature flexibility of the final elastomer is influenced more by filler network formation than by terminal vinyl content. In fumed silica-reinforced LSR, tensile strength passes through a maximum as crosslink density increases; beyond the optimum, tear strength and elongation at break decline. This is a central processing conflict: increasing terminal vinyl content to raise hardness can reduce the flexibility required in stretchable electronic substrates.
For electronic encapsulant use, the cured elastomer typically exhibits volume resistivity above 10^14 Ω·cm and dielectric strength above 18 kV/mm when tested according to IEC 62631-3-1 and IEC 60243-1. These values are achieved only after post-cure at 150 °C for 2 h to complete hydrosilylation and remove residual inhibitor.
Thermal aging data for addition-cure silicone elastomers based on terminal vinyl PDMS show retained elongation after 500 h at 200 °C in air; the exact retention depends on crosslinker purity and filler type. RH-Vi1311 itself is not the limiting factor in oxidative stability; residual platinum and low-molecular-weight cyclic siloxanes can influence long-term mass loss. The volatile matter limit of ≤ 1.0 % at 150 °C for 3 h is therefore a key quality control parameter for applications where outgassing is not permitted.
The surface energy of cured RH-Vi1311 elastomers is approximately 20–24 mN/m, close to that of bulk polydimethylsiloxane. This low surface energy is useful for mold release but limits adhesion to polar substrates. Primers containing silane coupling agents such as 3-glycidoxypropyltrimethoxysilane are required for bonding to glass or aluminum; without priming, adhesive failure occurs at the silicone-metal interface.
In LED encapsulant applications, formulations based on RH-Vi1311 are filtered through 1.0 µm membrane cartridges and degassed until optical transmittance at 450 nm exceeds 90 % when measured by ASTM D1003. The low ionic content and absence of condensation byproducts reduce the risk of electrode corrosion on silver-plated leadframes. However, encapsulants containing this fluid should not be exposed to sulfur-containing outgassing from adjacent epoxy substrates, because platinum catalyst inhibition can produce a tacky surface at the interface. In flexible mold compounds, the terminal vinyl structure yields low linear shrinkage and good release against polyurethane casting resins, provided the mold surface is not contaminated with amine-based release agents.
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