| HS Code | 445086 |
| Productname | Vinyl Terminated Silicone Oil RH-Vi1323 |
| Chemicalname | Vinyl-terminated polydimethylsiloxane |
| Casnumber | 68083-19-2 |
| Appearance | Colorless transparent liquid |
| Odor | Odorless |
| Terminalgroup | Vinyl |
| Viscosityat25c | 1,000 mPa.s |
| Vinylcontent | 0.45 wt% |
| Specificgravityat25c | 0.97 |
| Refractiveindexat25c | 1.403 |
| Volatilecontent | ≤2.0 wt% |
| Flashpoint | >300 °C |
| Solubility | Soluble in toluene and xylene; insoluble in water |
| Activecontent | ≥98 wt% |
As an accredited Vinyl Terminated Silicone Oil RH-Vi1323 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg net plastic drums with inner liners, securely sealed and clearly labeled for industrial handling. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Vinyl Terminated Silicone Oil RH-Vi1323 in sealed drums, properly secured and labeled for ocean shipment. |
| Shipping | RH-Vi1323 vinyl terminated silicone oil is typically shipped as a non-hazardous chemical in sealed, labeled drums or IBCs. Transport and store cool, dry, well-ventilated, away from moisture, sunlight, and contamination. Keep containers closed and follow the SDS, carrier, and local regulatory requirements. |
| Storage | Store Vinyl Terminated Silicone Oil RH-Vi1323 in a cool, dry, well-ventilated area using tightly closed, labeled original containers. Protect from moisture, direct sunlight, heat, sparks, and open flames. Keep away from strong oxidizers and incompatible materials. Use spill containment and good ventilation; do not store near food, feed, or potable water. |
| Shelf Life | Shelf life is typically 12 months when stored in original unopened containers at room temperature, protected from light and moisture. |
In platinum-catalyzed addition-cure liquid silicone rubber for short-term implant and respiratory applications, RH-Vi1323 functions as the vinyl-bearing base fluid that crosslinks with hydride-functional polydimethylsiloxane through hydrosilylation at terminal vinyl groups. A two-part LSR system is compounded with 100 parts RH-Vi1323 in both A and B sides; Component A carries 5–15 phr hydrogen-functional crosslinker and 0.01–0.1 phr 1-ethynylcyclohexanol inhibitor, while Component B carries 2–10 ppm platinum as Karstedt catalyst, and the two components are metered at a 1:1 volume ratio before entering a 24–32-element static mixer. Downstream processing is performed on LSR-specific injection molding machines with barrel temperatures held at 18–24°C, mold temperatures between 120°C and 180°C depending on wall thickness, and clamp force from 500 kN to 2500 kN; the mixed compound is injected through a screw with L/D ratio 12:1–18:1, cured for 30–120 s/mm of wall thickness, and post-cured at 200°C for 4 h to remove volatile cyclic siloxanes and stabilize compression set. Finished product types include endotracheal tube cuffs, ventilator diaphragms, needleless valve components, skin-contact sensor housings, and short-term catheter balloon sleeves. Compliance is verified against ISO 10993-5:2009 for in vitro cytotoxicity, ISO 10993-10:2010 for sensitization and irritation, USP <88> Class VI for systemic injection and intracutaneous reactivity, and FDA 21 CFR 177.2600 for extractives from rubber articles under repeated-use conditions; each production lot is evaluated for volatile content by headspace gas chromatography after post-cure. A known processing boundary is platinum-catalyst inhibition by sulfur-containing accelerators, amine compounds, and organotin stabilizers; latex or thiuram-accelerated nitrile gloves must not contact uncured material, and contact surfaces contaminated with sulfur can produce tacky, uncured regions without visual indication.
| Standard / Method | Test Condition | Typical Required Outcome |
|---|---|---|
| ISO 10993-5:2009 | MTT assay, 24 h extract | ≥ 70% viability relative to control |
| ISO 10993-10:2010 | Buehler closed patch | No erythema grade ≥ 2 |
| USP <88> Class VI | 0.9% NaCl extraction at 121°C for 1 h | No systemic response |
| FDA 21 CFR 177.2600 | Water and n-hexane extractives | Limits per 21 CFR 177.2600(b) |
High-transparency optical encapsulants for mid-power LED packages depend on terminal vinyl concentration in RH-Vi1323 to control network crosslink density during platinum-catalyzed hydrosilylation, and this relationship shifts cured hardness and photo-thermal stability in contrasting directions. The addition ratio is formulated at 100 parts RH-Vi1323 with 3–8 phr hydride crosslinker at an Si-H/Si-Vi molar ratio between 1.2:1 and 1.8:1, 2–10 ppm platinum catalyst, and 0.01–0.05 phr inhibitor; lower hydride excess yields Shore 00 values from 20 to 40, while higher excess above 1.6:1 can produce residual Si-H that degrades under thermal aging and reduces optical transmittance. Production-scale encapsulation is carried out with a two-component piston dispense system feeding a static mixer, followed by vacuum degassing at 0.1 kPa for 5–10 min and cure in a nitrogen-purged oven at 100°C for 1 h followed by 150°C for 2 h; molding or dispensing into leadframe cavities is performed at room temperature to avoid bubble entrapment. Finished product types include LED chip encapsulants, COB encapsulant films, optical lenses, and light guide plates where total transmittance requirements are verified according to ASTM D1003-21, hardness according to ASTM D2240-15(2021), tensile elongation according to ASTM D412-16, and thermal conductivity according to ASTM D5470-17; flame classification is tested to UL 94 V-0, and restricted substances are screened under RoHS Directive 2011/65/EU. Because RH-Vi1323 lacks phenyl substitution, refractive index remains near 1.40–1.41, so packages requiring index above 1.50 require a phenyl silicone co-resin; adding high-index mineral fillers can reduce total transmittance below the 90% threshold commonly needed, and uncured solder flux residues on leadframes must be plasma-cleaned because sulfur compounds poison platinum cure at the interface.
Solvent-free thermal release coating of paper and polymer film substrates uses RH-Vi1323 as the vinyl-functional base polymer that reacts with a hydride crosslinker within a platinum-catalyzed addition-cure bath to form a controlled-release siloxane network. The addition ratio is maintained at 100 parts RH-Vi1323, 2.5–4.5 phr hydride crosslinker, 0.1–0.3 phr 1-ethynylcyclohexanol inhibitor, and 50–120 ppm platinum catalyst; the Si-H/Si-Vi ratio is held between 1.3:1 and 1.7:1 to balance immediate release force against subsequent adhesion retention. Downstream processing uses five-roll gravure or offset coating heads with a target coat weight of 0.5–1.5 g/m², followed by hot-air oven cure at 120–180°C for 5–20 s; line speeds between 200 m/min and 600 m/min are typical on polyester film, glassine, and polypropylene substrates. Release performance is measured according to FINAT FTM 3 at 180° peel angle and 300 mm/min peel speed, and subsequent adhesion is measured according to FINAT FTM 4; food-contact status is evaluated under FDA 21 CFR 175.300 and BfR Recommendation XV for silicones, with extractables controlled below 2% of coat weight. Finished product types include label release liners, graphic film backings, diaper tape release films, transfer tape liners, and PET release films for optical adhesive lamination. Moisture ingress above 60% RH in the coating room consumes hydride and generates hydrogen, causing pinholes and variable release force; amine-containing polymer films require corona pretreatment or primer application before coating because unreacted amine species inhibit platinum cure at the substrate interface.
When compounded into addition-cure high-consistency silicone rubber for powertrain sealing, RH-Vi1323 is introduced as a reactive processing diluent that lowers compound viscosity without creating extractable plasticizer residues because its terminal vinyl groups enter the crosslinked network. Addition ratios range from 5–30 phr RH-Vi1323 per 100 parts high-viscosity silicone gum, combined with 20–50 phr fumed silica having BET surface area from 150–300 m²/g, 2–6 phr hydride crosslinker, 0.05–0.2 phr inhibitor, and 5–20 ppm platinum catalyst; the Si-H/Si-Vi molar ratio is maintained between 1.1:1 and 1.5:1 to prevent post-cure compression set drift. Downstream processing occurs in an internal mixer or two-roll mill at 20–40°C, followed by filtration through a 100 µm screen to catch unmixed silica agglomerates, and then compression or transfer molding at 170–200°C with 20–40 MPa injection pressure for transfer tools; post-curing at 200°C for 4 h removes catalyst residues and stabilizes hardness. Finished product types include O-rings evaluated to ISO 3601-1:2012, gaskets classified under ASTM D2000 MGE, charge air cooler hoses, spark plug boots, and vibration damping mounts. Compression set is measured according to ASTM D395-18 method B at 150°C for 22 h, hardness according to ASTM D2240-15(2021), and flammability according to ISO 3795. A processing boundary is encountered when the compound contacts sulfur-cured EPDM seals or gaskets in the same assembly; sulfur and accelerator residues migrate to the interface and inhibit platinum cure, leaving a tacky under-cured layer, so post-mold cleaning and segregated storage are required. Fumed silica must be pre-dried at 150°C for 4 h whenever ambient RH exceeds 60%, because moisture above 0.5 wt% consumes hydride and shifts the Si-H/Si-Vi ratio below 1.0:1, producing soft, high-compression-set parts.
Addition-cure silicone foam for electric vehicle battery compression pads requires RH-Vi1323 to form the vinyl-terminated base network while hydride-functional siloxane serves both as crosslinker and as hydrogen gas source when it reacts with trace water or alcohol in the closed mold. The addition ratio is set at 100 parts RH-Vi1323, 3–10 phr hydride crosslinker, 0.2–1.0 phr water or short-chain alcohol, 0.5–2.0 phr silicone surfactant, and 5–30 ppm platinum catalyst; the Si-H/Si-Vi molar ratio is held between 1.0:1 and 1.5:1 because excess hydride above 1.6:1 generates uncontrolled hydrogen evolution that produces surface fissures and non-uniform closed-cell structure. Downstream processing uses a two-component static mixer followed by casting into a mold filled to only 60–70% of cavity volume, with cure staged from 80°C to 120°C over 20–40 min and post-cured at 150°C for 2 h; the exotherm at the foam core can raise center temperature by 15–30°C above the mold set point, so cavity temperature gradients must be kept below 5°C across the tool to prevent skin pre-cure. Finished product types include EV cell compression pads, battery pack fire barrier pads, and vibration isolation pads; flammability is tested to UL 94 V-0, cellular material classification to ASTM D1056-14, limiting oxygen index to ISO 4589-2:2017, and thermal runaway propagation resistance under GB 38031-2020 where applicable. Published data for RH-Vi1323-specific EV foam formulations is limited; the stated process windows derive from structurally analogous vinyl-terminated dimethylsiloxanes and should be verified by die cavity trials before release to series production. Mold moisture above 60% RH and filler water content above 0.3 wt% should be avoided because water consumption of hydride shifts the blowing gas balance and can cause either gross void coalescence or under-foamed dense cores.
Filled two-part silicone potting compounds for power electronics use RH-Vi1323 as the vinyl-terminated base fluid that is blended with thermally conductive fillers and crosslinked through hydrosilylation to form a soft, stress-absorbing encapsulant with defined dielectric strength. The addition ratio is formulated at 100 parts RH-Vi1323, 5–15 phr hydride crosslinker, 40–70 wt% alumina or boron nitride filler with particle size 2–10 µm, 0.5–2.0 phr organofunctional adhesion promoter, and 2–10 ppm platinum catalyst; filler loading above 65 wt% typically raises mixed viscosity beyond 50,000 mPa·s and narrows the processing window for vacuum-assisted dispensing. Downstream production is carried out in a planetary mixer at 20–30°C, followed by vacuum degassing at 0.1–1.0 kPa for 15–30 min, static-mixer dispensing into power module housings, and cure at 60°C for 30 min followed by 130–150°C for 2 h; potting sections above 20 mm thickness require staged cure because exothermic crosslinking can raise internal temperatures by 25–40°C and produce cracks at the copper leadframe interface. Finished product types include onboard charger potting, DC-DC converter encapsulants, IGBT module potting, and power factor correction magnetics encapsulation. Compliance is verified according to ASTM D5470-17 for thermal conductivity, ASTM D257-14 for volume resistivity, IEC 60243-1:2013 for dielectric strength, IEC 60068-2-14:2009 for thermal cycling endurance, and UL 746C for polymeric materials in electrical equipment. Processing boundaries include incompatibility with uncured epoxy or polyurethane amine residues on the same potting line; platinum cure is poisoned by amine and sulfur species, and condensation-cure silicone tools must not share static mixers or dispensing needles without full solvent cleaning.
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Vinyl-terminated silicone oil RH-Vi1323 is a linear α,ω-divinyl poly(dimethylsiloxane) fluid supplied as a clear, water-white liquid. The terminal vinyl groups are attached to silicon through Si–C linkages, so the product does not undergo hydrolytic chain extension in ambient humidity. Its nominal viscosity at 25 °C is 1000 mPa·s. In platinum-catalysed addition-cure systems, RH-Vi1323 functions as a reactive diluent, chain extender, and base oligomer. Because each chain carries two terminal vinyl groups, the product provides a defined reaction stoichiometry with methylhydrogensiloxane crosslinkers and avoids the uncontrolled branching introduced by pendant vinyl distribution.
The specification envelope for RH-Vi1323 as typically supplied is summarized in Table 1. The lot-specific certificate of analysis remains the controlling document for production batching, because titrimetric vinyl content can vary by ±0.005 mmol/g across laboratories and can shift the required Si–H/Si–Vi molar ratio by 0.05–0.10 under low platinum loadings.
| Property | Specification | Test method |
|---|---|---|
| Appearance | Colourless transparent liquid | Visual inspection |
| Viscosity at 25 °C | 1000 ± 200 mPa·s | ISO 3219:2016 |
| Density at 25 °C | 0.968–0.972 g/cm³ | ISO 1675:2018 |
| Refractive index at 25 °C | 1.4030–1.4050 | ISO 280:1998 |
| Vinyl content | 0.060–0.100 mmol/g | Titrimetric method, internal |
| Non-volatile content | ≥ 99.0% | ISO 3251:2019 |
| Water content | ≤ 200 mg/kg | ISO 6296:2000 |
| Flash point, Cleveland open cup | > 300 °C | ISO 2592:2017 |
Viscosity is measured after a 30-minute conditioning period at 25 °C using a rotational rheometer with double-gap geometry. Batch viscosity variation of ±200 mPa·s does not usually require reformulation in continuous mixing, but gravimetric metering systems should compensate for density shifts when material temperature exceeds 30 °C. Incoming inspection should include vinyl content and water content rather than viscosity alone. A batch at the lower vinyl content limit with viscosity at the upper limit can change the Si–H/Si–Vi ratio by 0.15 when crosslinker addition is fixed by weight. Where high-throughput compounding uses gravimetric rather than molar dosing, the resulting hardness drift may exceed 5 Shore A points.
Infrared analysis should show the terminal vinyl Si–CH=CH₂ deformation near 960–980 cm⁻¹. A broad O–H band at 3200–3600 cm⁻¹ indicates residual silanol contamination from incomplete end-capping or condensation-grade carryover. Such contamination is detectable before it affects hydrosilylation stoichiometry and should trigger rejection or purification of the batch. For high-assurance applications, 1H NMR spectroscopy can distinguish terminal vinyl protons at 5.8–6.2 ppm from internal propenyl isomer protons that appear after high-temperature processing. The terminal vinyl to internal isomer ratio should be ≥ 95% for maximum reactivity.
Addition-cure network formation with RH-Vi1323 and Si–H crosslinkers proceeds by platinum-catalysed hydrosilylation. Two production-scale variables dominate: Si–H/Si–Vi molar ratio and catalyst inhibition. At molar ratios below 1.0, some terminal vinyl groups remain unreacted and extractables increase. At ratios above 1.4, residual Si–H can liberate hydrogen during cure or post-cure. Typical room-temperature-vulcanising formulations target 1.1–1.3; addition-cure gels may use 1.0–1.2 to control hardness.
Catalyst inhibition from sulfur, amines, phosphines, and certain organotin compounds is a documented failure mode on production equipment. A mixed two-part formulation based on RH-Vi1323 may remain fluid indefinitely at 25 °C when contaminated with only 5 mg/kg of dibutylamine, but fail to cure at normal mould temperatures of 120–160 °C. Before switching an injection-moulding machine from a condensation-cure silicone grade, static mixer elements, check valves, and barrel surfaces should be flushed with isopropanol and dried at 60 °C. Sulfur-containing rubber residues and amine-bearing mould release agents should be segregated from RH-Vi1323-containing work areas.
Inhibitor selection sets the processing window. 1-Ethynyl-1-cyclohexanol provides storage-stable mixed systems below 40 °C and releases cure activity above 80 °C. Increasing inhibitor concentration extends induction time, but cure speed at 120 °C may drop below 3 mm/min through thick sections. Injection-moulding cure time is best determined by moving-die rheometry under ISO 6502-2:2018, not by open-cup gel time alone.
In planetary mixer compounding, RH-Vi1323 is typically added at 8–18 parts per hundred resin to a high-viscosity vinyl gum before filler introduction. The viscosity reduction lowers mixing torque and delays temperature rise above 45 °C, the threshold at which uninhibited two-part systems can begin spontaneous hydrosilylation. Fumed silica with BET surface area 200–300 m²/g may require hydrophobic surface treatment using hexamethyldisilazane under nitrogen; RH-Vi1323 is compatible with this treatment and does not generate the condensation water that would otherwise deactivate the platinum catalyst.
Static mixers for LSR dosing should contain 32–48 elements. Dynamic mixers should maintain tip speeds below 2 m/s to avoid shear heating above 45 °C. On injection-moulding machines with clamp force above 1,000 kN, barrel zones are normally set between 25 °C and 55 °C while the mould operates at 120–160 °C. Short-shot defects at wall thickness below 1 mm often indicate Si–H depletion or platinum inhibition rather than viscosity off-spec.
Replacement of pendant vinyl silicone copolymers with RH-Vi1323 changes cured-network topology. Terminal vinyl groups create linear chain extension between junction points, whereas pendant vinyl groups create branch nodes and shorter elastically active chain lengths. At equivalent Si–H/Si–Vi molar ratio, moulded specimens from RH-Vi1323-based formulations typically show lower Shore A hardness and higher elongation at break than those prepared with pendant vinyl copolymers. The difference is most visible below 20 phr of reinforcing fumed silica, where network architecture rather than filler–polymer interaction controls modulus. Published comparative data for this exact grade is limited, but the trend is consistent with known structure–property behaviour of α,ω-divinyl PDMS.
When RH-Vi1323 is substituted for hydroxy-terminated PDMS, the cure mechanism shifts from condensation to addition. No water, methanol, or acetic acid by-product is formed. This is the controlling difference in closed electronic assemblies; condensation by-products above 50 ppm can corrode silver-plated leads or fog optical lenses. When RH-Vi1323 is substituted for methyl-terminated PDMS, the fluid changes from a non-reactive diluent to a network-active polymer. Direct mass-for-mass replacement without adjusting Si–H crosslinker content and platinum loading is not appropriate.
Table 2 compares terminal chemistry and network contribution of RH-Vi1323 with adjacent silicone fluids used in similar formulations.
| Attribute | RH-Vi1323 | Hydroxy-terminated PDMS | Methyl-terminated PDMS | Pendant vinyl copolymer |
|---|---|---|---|---|
| Reactive group position | Terminal vinyl | Terminal silanol | None | Pendant vinyl side groups |
| Crosslink involvement | Forms network via Si–H addition | Condenses with silane crosslinkers | Does not crosslink | Forms branched network |
| Cure by-product | None | Water, methanol, or acetic acid depending on crosslinker | None | None |
| Moisture sensitivity during storage | Low | High | Low | Low |
| Typical use in LSR | Reactive diluent/base fluid | Not used in platinum cure | Non-reactive diluent | Co-crosslinker/modifier |
RH-Vi1323 is not a standalone elastomer and requires a Si–H-functional crosslinker and a platinum catalyst. The product should be stored in sealed containers below 30 °C. Repeated opening at relative humidity above 60% can increase water content and produce microvoids in closed-cell or optically clear seals. Strong acids or bases at temperatures above 80 °C can catalyse siloxane redistribution and change molecular weight distribution. Contact with amine-based additives, sulfur-containing materials, organotin compounds, and phosphine ligands should be prevented during mixing, dispensing, and curing.
For regulatory compliance, RH-Vi1323 as supplied is accompanied by documentation addressing REACH Regulation (EC) No 1907/2006 and RoHS Directive 2011/65/EU as amended. Food-contact use is not granted solely by the fluid specification; finished rubber articles may be evaluated under 21 CFR 177.2600 when extraction testing is performed on the final compound. Medical or implant use requires separate biocompatibility assessment under ISO 10993-1.
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