| HS Code | 955459 |
| Product Name | Vinyl Terminated Silicone Oil RH-Vi1303 |
| Chemical Type | Vinyl-terminated polydimethylsiloxane |
| Terminal Functional Group | Vinyl |
| Functionality | Difunctional |
| Appearance | Colorless to pale yellow transparent liquid |
| Viscosity At 25c Mpa S | 1000 (typical) |
| Vinyl Content Mmol G | 0.13 (typical) |
| Volatile Content 150c 3h Percent | ≤2.0 |
| Refractive Index At 25c | 1.403 (typical) |
| Specific Gravity At 25c | 0.97 (typical) |
| Flash Point C | >200 |
| Water Solubility | Insoluble |
| Solvent Solubility | Soluble in aromatic and aliphatic hydrocarbons |
| Cure Mechanism | Hydrosilylation addition cure with Si-H compounds |
| Dielectric Property | Good electrical insulation |
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 supplied in 25 kg sealed plastic drums, clearly labeled with product identification and safety information. |
| Container Loading (20′ FCL) | 20′ FCL loading of Vinyl Terminated Silicone Oil RH-Vi1303: securely stowed, sealed, labeled, and braced drums for safe chemical transport. |
| Shipping | Vinyl Terminated Silicone Oil RH-Vi1303 is typically shipped in sealed steel drums or IBCs under ambient conditions. It is generally not classified as dangerous goods; follow the SDS and local regulations, keep containers closed, and protect from moisture, contamination, heat, and direct sunlight. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and flames. Keep containers tightly closed, labeled, and in original packaging. Protect from moisture, dust, and contamination; avoid contact with strong oxidizers, acids, and bases. Use secondary containment where required and follow local regulations. |
| Shelf Life | Shelf life is 12 months from production date in the original unopened container, stored cool, dry, and protected from sunlight. |
In injection molding of addition-cure liquid silicone rubber, RH-Vi1303 functions as the vinyl-functional poly(dimethylsiloxane) whose terminal vinyl groups enter the platinum-catalyzed hydrosilylation network with methylhydrogen siloxane crosslinkers. The base compound typically contains 55–85 wt% Vi1303, 10–30 wt% fumed silica of 150–300 m²/g BET surface area, and 0.05–0.2 wt% ethynyl cyclohexanol as cure inhibitor. Industry compliance for food-contact and medical LSR parts is established through FDA 21 CFR 177.2600, EU Regulation 1935/2004, and ISO 10993-5 when the cured elastomer is intended for skin contact. The vinyl-to-hydride molar ratio is held between 0.8:1 and 1.2:1; ratios below 0.8:1 produce tacky surfaces with extractable siloxane oligomers, while ratios above 1.2:1 raise crosslink density to the point where elongation at break falls below 250% and compression set deteriorates.
| Si-H:Vinyl molar ratio | Tensile strength ASTM D412-16 | Elongation at break ASTM D412-16 | Tear strength ASTM D624-00 |
|---|---|---|---|
| 0.8:1 | 5.0–6.5 MPa | 450–550% | 14–18 kN/m |
| 1.0:1 | 6.5–8.0 MPa | 350–450% | 18–24 kN/m |
| 1.2:1 | 7.5–9.0 MPa | 250–350% | 20–26 kN/m |
Production-scale molding lines for such compounds use 200 L drum pump systems with precision gear pumps delivering A and B components at a 1:1 volume ratio and a metering tolerance of ±1%. The barrel is cooled to 15–25 °C to suppress premature gelation; screw L/D ratios of 12:1–20:1 with low compression screws reduce shear heating. Tooling is maintained at 110–180 °C, injection pressures range from 500–1,500 psi, and cure cycles of 30–90 s are typical for shot masses of 5–300 g in multi-cavity layouts. Process failure modes observed on multi-cavity tooling include scorched runner build-up when the inhibitor content drops below 0.05 wt% and non-fill in ribs thinner than 0.3 mm when mold temperature exceeds 180 °C and cure onset shortens to 2–5 s.
Terminal part types produced from this configuration include automotive connector seals, membrane valves for beverage dispensing equipment, bakeware molds, infant feeding nipple components, and pharmaceutical stoppers. In each case, post-curing for 2–4 h at 180–200 °C removes volatile siloxane residues and stabilizes the compression set.
Solventless addition-cure silicone release coatings formulated with RH-Vi1303 operate at a coating weight of 0.8–1.6 g/m²; below 0.8 g/m² pinholing and transfer of silicone to the adhesive occur, while above 1.6 g/m² the cure time and platinum catalyst consumption rise without measurable release-force benefit. The working formulation consists of 100 parts Vi1303, 2.5–5.0 phr methylhydrogen siloxane crosslinker, 30–120 ppm platinum catalyst, and 0.05–0.3 phr ethynyl cyclohexanol inhibitor. Release force across the finished liner is adjusted from 5 cN/25 mm to 100 cN/25 mm by shifting the Si-H:Vinyl ratio and the post-cure thermal profile; peel force is measured according to FINAT FTM 3 against standard acrylic tapes and residual adhesion according to FINAT FTM 11. Compliance for food-contact release liners is documented against EU Regulation 1935/2004, FDA 21 CFR 175.300, and REACH Annex XVII restrictions. The coating is applied on PET, BOPP, glassine, and PE-coated kraft substrates through a five-roll offset gravure coating head operating at 200–400 m/min; the web then passes through an air-flotation oven with a dwell time of 5–15 s at 120–180 °C. Corona pre-treatment to a surface energy of 42–48 dyn/cm is required on PET and BOPP; untreated films below 38 dyn/cm produce coating dewetting and non-uniform release values. Inhibition of platinum cure is observable on substrates containing free amines, particularly some recycled PET grades and amine-catalyzed polyurethane backings; reformulation with a higher catalyst dose of 150–200 ppm or substrate change is required. Terminal products include release liners for pressure-sensitive label stock, PSA tape, automotive interior foam tapes, hygiene acquisition layers, and medical wound-care adhesive constructions.
Low-refractive-index optical encapsulation with RH-Vi1303 at 70–90 wt% is compounded with 5–15 wt% methylhydrogen siloxane crosslinker, 0.5–2 wt% of a methacryloxypropyl-trimethoxysilane adhesion promoter, and 2–10 ppm platinum catalyst. The cured encapsulant has a refractive index of approximately 1.41 at 589 nm, which restricts its use to mid-power SMD LED packages, optocouplers, and indicator light bars where high-brightness white-light extraction does not require phenyl-modified silicone with a refractive index above 1.50. Processing begins with vacuum degassing at 200–500 Pa for 10–20 min, followed by precision dispensing onto lead frames or cavity packages and thermal curing at 80 °C for 1 h followed by 150 °C for 2 h. Compliance statements for such optoelectronic encapsulants reference UL 94 V-0 for flammability, IEC 60068-2-14 for thermal shock resistance, and RoHS Directive 2011/65/EU for lead-free compatibility. Published data for RH-Vi1303-specific LED encapsulant formulations is limited; the ranges reported here reflect analogous vinyl-terminated PDMS systems of similar viscosity and vinyl content. Terminal products are SMD LED encapsulant domes, optocoupler dielectric fillers, and small-area light-bar coverings where optical clarity and low stress on bond wires are primary requirements.
At low crosslink density, RH-Vi1303-based addition-cure gels are filled into insulated-gate bipolar transistor module housings to provide a stress-absorbing dielectric layer over aluminum bond wires. The formulation consists of 80–95 wt% Vi1303, 5–10 wt% methylhydrogen siloxane crosslinker, and 5–20 ppm platinum catalyst; no fumed silica is added, which retains the low modulus and high optical clarity required for wire-bond inspection. The mixed compound is degassed in a planetary vacuum mixer at 50–100 Pa and dispensed through a progressive cavity pump into poly(phenylene sulfide) or liquid-crystal-polymer module frames. Cure is conducted at 60–100 °C for 30–120 min, and full network development is confirmed by measuring residual Si-H content via FTIR at 2160 cm⁻¹. The relevant electrical insulation standard is IEC 60664-1, while UL 94 HB is applied to the cured gel bulk; for applications above 4.8 kV transient overvoltage, an additional conformal coating or higher-clearance design is specified because the gel alone does not guarantee creepage performance. Terminal products include IGBT module silicone gel encapsulation, automotive electronic control unit potting, and high-voltage power supply isolation layers.
When RH-Vi1303 is added to high-consistency silicone rubber as a reactive plasticizer, the addition level is held between 1 phr and 5 phr; at 1–2 phr the Mooney viscosity of the base compound is reduced by 10–20 MU on a Mooney viscometer, and at 5 phr the durometer can shift from 70 Shore A to 55 Shore A without introducing substantial extractable siloxane. Additions above 8 phr poison the tear strength and lead to a measurable bloom on the cured surface. The compound is mixed on a two-roll mill or in an internal mixer with fumed silica and process aids first, then Vi1303 is added with the peroxide or platinum cure system. In peroxide-cured systems, the vinyl end groups increase crosslink density and reduce compression set; in platinum-cured HCR, Vi1303 competes with the base gum for Si-H functional sites and requires adjustment of the crosslinker stoichiometry by 0.5–1.5 phr. Curing is carried out by compression molding at 150–190 °C or continuous hot-air vulcanization at 200–230 °C for profiles and hoses. Compliance for food-contact and industrial parts references FDA 21 CFR 177.2600 and BfR recommendation XV. Terminal products include extruded coolant hoses, oven door gaskets, industrial diaphragm sheets, and molded seals for hot-air systems.
For implantable and skin-contact medical elastomers, RH-Vi1303 is compounded at 60–80 wt% with 15–30 wt% of precipitated silica or fumed silica treated with hexamethyldisilazane, 2–6 wt% methylhydrogen siloxane, and 1–5 ppm platinum catalyst. The platinum content is minimized because post-cure extraction testing under ISO 10993-5 tracks residual catalyst and low-molecular-weight siloxanes. After mixing, the compound is extruded through a 30–60 mm diameter screw with an L/D of 20:1–30:1 into a hot-air vulcanization tunnel operating at 150–200 °C; thin-walled tubing is cured at line speeds of 10–50 m/min depending on wall thickness. Silicone balloons and catheter cuffs are formed by dip-coating or injection molding with post-cure at 180 °C for 2 h to remove volatile residues. Vulcanization kinetics are retarded by amine-containing organic pigments, sulfur-based additives, and certain sterilant residues; these materials must be excluded from the cleanroom compounding environment. Compliance documentation for finished devices is governed by ISO 10993-1 biological evaluation, USP Class VI, FDA 21 CFR 177.2600, and EU MDR 2017/745 for medical devices. Terminal products include peristaltic pump tubing, respiratory mask cushions, catheter balloons, wound-care sheeting, and anesthesia reservoir bags.
| Standard | Scope |
|---|---|
| ISO 10993-1 | Biological evaluation of medical devices |
| USP Class VI | In vivo biological reactivity tests for plastics and elastomers |
| FDA 21 CFR 177.2600 | Rubber articles intended for repeated food-contact use |
| EU MDR 2017/745 | Medical device safety and performance requirements |
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RH-Vi1303 is a linear α,ω-divinyl-terminated polydimethylsiloxane fluid supplied as a reactive intermediate for addition-cured silicone elastomers, coatings, and potting compounds. The product model identifies a terminal vinyl-functional silicone oil with a nominal kinematic viscosity of 300 mm²/s at 25°C; the designation separates it from hydroxy-terminated fluids and from branched or pendant vinyl-functional fluids. In two-component liquid silicone rubber processing, the material functions as the base polymer that undergoes platinum-catalyzed hydrosilylation with hydride-functional crosslinkers. Each polymer chain carries two terminal vinyl groups, giving a defined difunctional architecture rather than a random distribution of reactive sites along the siloxane backbone. The molecular weight calculated from terminal vinyl content falls between 9,000 g/mol and 10,000 g/mol, corresponding to a degree of polymerization of approximately 120–135 dimethylsiloxane units. Because the reactive sites are located only at chain ends, the cured network can develop longer elastically effective chain segments than formulations based on pendant vinyl fluids of similar vinyl concentration. The fluid is Newtonian over the shear-rate range 0.1 s⁻¹ to 1,000 s⁻¹ at 25°C, which simplifies die design for static-mix and metering equipment.
Chemical Abstracts Service registration for the divinyl-terminated polydimethylsiloxane class is 68083-19-2. The RH-Vi1303 grade is produced by base-catalyzed ring-opening polymerization of octamethylcyclotetrasiloxane with divinyltetramethyldisiloxane as an end-blocking unit. This route yields a low-volatile, non-hydrolyzable terminal functionality. Residual cyclic dimethylsiloxanes are controlled under the manufacturer’s internal specification because they can contribute to outgassing in closed-mold processes and to surface haze after oven post-cure.
| Parameter | Test method | RH-Vi1303 typical value | Trimethylsilyl-terminated PDMS 300 cSt | Hydroxy-terminated PDMS 300 cSt |
|---|---|---|---|---|
| Appearance at 25°C | Visual inspection | Colorless transparent liquid | Colorless transparent liquid | Colorless to slightly hazy liquid |
| Kinematic viscosity | ASTM D445-21 | 280–320 mm²/s | 280–320 mm²/s | 250–350 mm²/s |
| Vinyl content | Iodometric titration | 0.18–0.24 mmol/g | <0.01 mmol/g | <0.01 mmol/g |
| Volatile content, 150°C/2h | ASTM D4559-20 | ≤1.0 wt% | ≤0.5 wt% | ≤2.0 wt% |
| Specific gravity at 25°C | ASTM D792-20 | 0.965–0.975 | 0.960–0.970 | 0.970–0.980 |
| Refractive index at 25°C | ASTM D1218-21 | 1.4030–1.4050 | 1.4030–1.4050 | 1.4035–1.4055 |
| Reactive terminal group | FTIR | α,ω-divinyl | Methyl | Silanol |
Viscosity is determined with an Ubbelohde viscometer calibrated to ASTM D445-21 at 25.00°C; the reported RH-Vi1303 band of 280–320 mm²/s is wider than typical laboratory repeatability because commercial batch-to-batch variation is controlled for fluid handling rather than for absolute rheometry. Vinyl content is measured by iodometric titration; the range of 0.18–0.24 mmol/g corresponds to one vinyl group per 4,170–5,560 g of polymer, consistent with two terminal sites on a linear chain of 9,000–10,000 g/mol. Volatile content is assessed after 2 h at 150°C under nitrogen according to ASTM D4559-20; the limit of ≤1.0 wt% reduces the risk of outgassing in closed molds when liquid silicone rubber compound is injected at barrel temperatures between 120°C and 180°C. The specific-gravity range of 0.965–0.975 measured by ASTM D792-20 is lower than that of many hydroxy-terminated fluids of equivalent viscosity, which can shift gravimetric mix ratios by 0.5–1.0% if not re-verified.
Batch acceptance for RH-Vi1303 is based on viscosity, vinyl content, volatile content, and visual appearance. For addition-cure customers, the analytical parameter with the greatest effect on mix ratio is vinyl content, not viscosity. A shift from 0.18 mmol/g to 0.24 mmol/g changes the stoichiometric hydride requirement by 33%. Two-component dosing equipment with fixed volumetric ratio therefore requires recalibration after each lot if batch vinyl content varies by more than ±0.02 mmol/g. Manufacturers using indirect gravimetric metering should convert the hydride component from volume to mass because specific-gravity differences between vendor lots of 0.005 can alter the actual Si-H/Si-Vi ratio by approximately 0.5%.
Platinum-catalyzed hydrosilylation follows first-order dependence on platinum concentration and Si-H concentration at low vinyl conversion; formulation with RH-Vi1303 is normally adjusted by molar Si-H/Si-Vi ratio rather than by viscosity alone. For a 100 g charge of RH-Vi1303 with a vinyl content of 0.20 mmol/g, the available vinyl function is 20 mmol. If a hydride crosslinker with a Si-H content of 4.0 mmol/g is selected, a Si-H/Si-Vi ratio of 1.1:1 to 1.5:1 requires 5.5 g to 7.5 g of hydride fluid. Using the lower bound minimizes residual Si-H, while the upper bound compensates for moisture-mediated Si-H loss and inhibitor retarding effects. Platinum levels from 5 ppm to 20 ppm based on total compound mass are typical; higher levels reduce gel time but narrow the pot life at 25°C.
On a 120-tonne injection molding machine with closed-loop mold temperature control at 125°C, the demolding time is primarily controlled by the inhibitor package and platinum concentration rather than by the vinyl oil viscosity. RH-Vi1303 does not introduce methoxy or silanol side reactions, so the cured compound does not generate methanol or water during cure. This distinguishes it from condensation-cure systems based on hydroxy-terminated polydimethylsiloxane. However, platinum cure is sensitive to poison levels in the parts-per-million range. Sulfur-containing gaskets, organotin-stabilized vinyl jackets, amine-based mold release agents, and certain solvent residues can inhibit hydrosilylation or cause surface tack. When RH-Vi1303 is processed in the same production cell as sulfur-cured organic rubber, tooling and feed lines should be segregated because airborne sulfur at 10–50 ppm in the production atmosphere has been reported to affect platinum activity.
RH-Vi1303 is metered as component A in two-component addition-cure systems. The preferred mix head configuration for a 300 mPa·s base fluid is a static mixer with 10–12 helical elements and an internal diameter of 12.7 mm; this geometry supports homogeneous velocity profiles without requiring dynamic high-shear dispersion. In continuous coating operations, the fluid is blended with fumed silica in a planetary mixer operating at 20–40 rpm for 20–30 min. Three-roll mills with 3-roll geometry may be used for filler deagglomeration; the mill gap is set between 20 µm and 50 µm to avoid shear-thinning artefacts that do not exist with the Newtonian base oil.
RH-Vi1303 is Newtonian; oscillatory measurements at 25°C from 0.1 rad/s to 100 rad/s show no measurable storage modulus above the instrument noise floor of 0.001 Pa·s in a cone-and-plate geometry with 50 mm diameter and 1° cone angle. This behavior contrasts with filled silicone compounds, which are strongly shear-thinning and display yield stresses. The pure oil’s Newtonian plateau means that pressure-driven flow through a static mixer can be estimated with Poiseuille-type calculations using a constant viscosity of 300 mPa·s. Preheating the base component to 40°C lowers viscosity to approximately 200 mm²/s, reducing line pressure but shortening mixed-state pot life.
Formulators should not treat RH-Vi1303 as a simple drop-in for methyl-terminated oils. A typical 300 cSt trimethylsilyl-terminated fluid has the same Newtonian viscosity but lacks any functionality. If used in an addition-cure formulation, it behaves as a non-reactive diluent and reduces crosslink density by dilution; at 10 wt% replacement of RH-Vi1303, the active vinyl concentration falls by 10%, and the cured sheet may lose more than 10% of its torque value measured by moving-die rheometer at 120°C and 1° arc according to ISO 6502-2:2018.
Substitution of a hydroxy-terminated 300 cSt polydimethylsiloxane with RH-Vi1303 eliminates the condensation reaction pathway and changes the curing mechanism from tin- or titanium-catalyzed silanol condensation to platinum-catalyzed hydrosilylation. A methyl-capped 300 cSt polydimethylsiloxane does not crosslink at all; it remains an inert plasticizer and may migrate to the surface over time. RH-Vi1303 therefore cannot be used as a drop-in replacement in condensation-cure adhesive formulations without removing tin catalysts and moisture-carrying fillers. If the formulation contains water-releasing fillers above 0.1 wt% moisture, the hydrosilylation cure is affected by Si-H loss and by reduced adhesion to polar substrates. Pre-drying of fillers at 120°C for 2 h under vacuum is recommended when relative humidity in the compounding room exceeds 60%.
Compared with pendant vinyl silicone fluids, RH-Vi1303 presents a simpler network topology. In a pendant-vinyl fluid, reactive vinyl groups are distributed along the siloxane backbone; random scission or incomplete distribution can generate dangling chains and non-uniform mesh sizes. Terminal vinyl groups on RH-Vi1303 yield elastically effective network chains that are defined by the chain length between end groups. For the same total vinyl content in the polymer fraction, a terminal vinyl architecture usually produces lower modulus and higher elongation at break because the crosslink density is governed by the number of chain ends. Replacement of a pendant-vinyl fluid with RH-Vi1303 therefore requires an increase in hydride crosslinker or a reduction in total polymer molecular weight if durometer and tensile modulus are held constant. Tensile properties are compared on 2 mm cured sheets using ASTM D412-16 or ISO 37:2017 dumb-bell test pieces.
RH-Vi1303 is compatible with stainless-steel 316L, glass, and fluoropolymer liner surfaces. It can swell ethylene propylene diene monomer and natural rubber seals; static seals in metering systems should be constructed from FKM or FFKM. Use of nitrile rubber seals is not recommended because the oil may extract plasticizers and cause dimensional change. Neat RH-Vi1303 is moisture-insensitive, but the mixed two-component system is not; water contamination above 200 ppm can accelerate Si-H loss before cure. Containers should not be opened in high-humidity areas, and storage should be in sealed stainless-steel or fluoropolymer-lined containers at temperatures below 40°C.
Regulatory data for RH-Vi1303 are supplied in the REACH registration dossier and Safety Data Sheet. The fluid is not classified as hazardous under Regulation (EC) No 1272/2008. For cured rubber articles intended for repeated food contact, final compound compliance is assessed under FDA 21 CFR 177.2600 or BfR Recommendation XV; the uncured oil alone does not constitute a food-contact article. Volatile organic content, catalyst residues, and potential migration into food simulants must be tested on the cured compound, not on the neat vinyl-terminated silicone oil. Published data for this specific configuration is limited when non-standard food simulants or high-temperature repeated-use conditions exceed 100°C.
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