| HS Code | 819417 |
| Product Name | Vinyl Silicone Oil RH-Vi306B |
| Chemical Type | Vinyl-terminated polydimethylsiloxane |
| Appearance | Colorless to slightly yellow transparent liquid |
| Viscosity At 25 C Mpa S | 30000 |
| Vinyl Content Wt | 0.60 |
| Volatile Content 150 C 3h Wt | ≤1.0 |
| Refractive Index At 25 C | 1.403–1.410 |
| Density At 25 C G Cm³ | 0.97–0.98 |
| Flash Point C | ≥300 |
| Acid Value Mg Koh G | ≤0.05 |
| Storage Temperature C | 5–30 |
| Shelf Life Months | 12 |
As an accredited Vinyl Silicone Oil RH-Vi306B factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Vinyl Silicone Oil RH-Vi306B is supplied in 25 kg sealed plastic drums, with optional 200 kg bulk packaging. |
| Container Loading (20′ FCL) | Vinyl Silicone Oil RH-Vi306B loaded in a 20-foot FCL container, securely packed and stowed for safe transport. |
| Shipping | Vinyl Silicone Oil RH-Vi306B is shipped in clean, sealed containers under ambient conditions, protected from moisture, direct sunlight, heat, and contamination. It is generally not classified as dangerous goods for transport; confirm the current SDS and local shipping regulations before dispatch. |
| Storage | Store Vinyl Silicone Oil RH-Vi306B in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers tightly closed, properly labeled, and protected from moisture and contamination. Avoid contact with strong oxidizers and acids. Use original containers and maintain spill containment. |
| Shelf Life | Shelf life is 12 months from manufacture when stored in the original sealed container under cool, dry, ventilated conditions away from sunlight. |
On a 180-metric-ton servo-hydraulic injection molding machine fitted with an 18:1 L/D check-ring screw and a valve-gated cold runner, Vinyl Silicone Oil RH-Vi306B is introduced as the high-viscosity vinyl-terminated dimethylsiloxane fraction in the A-side of a two-component addition-cure liquid silicone rubber compound. The A-side combines 100 parts vinyl-functional polydimethylsiloxane gum, 4–12 parts RH-Vi306B, 20–35 parts fumed silica with BET surface area 200–300 m²/g, and 0.2–0.8 parts of a platinum-divinyltetramethyldisiloxane catalyst complex. The B-side contains the same vinyl polymer and 3.0–8.0 parts polymethylhydrogen siloxane, adjusted to a SiH/Vi molar ratio of 1.2–1.6:1. A low-temperature inhibitor, 0.03–0.08 phr of 1-ethynyl-1-cyclohexanol, suppresses premature hydrosilylation at barrel temperatures above 25 °C. The two sides are metered at 1:1 through a static mixer with 24–32 elements; mixer inlet pressure is maintained at 4–8 MPa to avoid cavitation at the high-viscosity interface. The material is injected at 200–400 bar into molds heated to 140–180 °C. Parts are demolded at 50–65 Shore A; demolding below 35 Shore A produces flash tears at split lines. Cure time is 5–12 s/mm at 150 °C, while lowering mold temperature to 140 °C increases cure time by 25–40% because platinum-catalyzed hydrosilylation is strongly temperature-dependent. The practical processing window is narrow: mold temperature deviations of ±5 °C around the inhibitor activation threshold alter knit-line strength and total volatiles.
After post-cure at 200 °C for 4 h, the vulcanizate typically shows tensile strength of 5.5–7.5 MPa per ASTM D412-16 die C, elongation at break of 350–550%, tear strength of 25–40 kN/m per ASTM D624-00(2020) die B, and compression set of 15–25% after 22 h at 175 °C under 25% deflection. Lot-to-lot variation in RH-Vi306B vinyl content shifts the SiH/Vi ratio and must be corrected by adjusting the hydride crosslinker dosage. End products include infant-feeding valves, respiratory masks, single-use medical seals, and cold-runner molded automotive grommets. Medical-grade compounds are post-cured 4 h at 200 °C and evaluated for cytotoxicity per ISO 10993-5:2009, skin sensitization per ISO 10993-10:2021, and repeated skin contact per ISO 10993-23:2021. FDA status is supported by end-product compliance with 21 CFR 177.2600 extraction limits for rubber articles intended for repeated use.
| RH-Vi306B loading (phr) | Hydride crosslinker (phr) | Hardness (Shore A, ASTM D2240-15(2021)) | Tensile strength (MPa, ASTM D412-16) | Elongation at break (%, ASTM D412-16) | Tear strength (kN/m, ASTM D624-00(2020)) |
|---|---|---|---|---|---|
| 4.0 | 6.5 | 46 | 6.8 | 420 | 24 |
| 8.0 | 6.0 | 39 | 6.1 | 550 | 27 |
| 12.0 | 5.5 | 33 | 5.2 | 670 | 31 |
| 16.0 | 5.0 | 27 | 4.4 | 760 | 34 |
Solventless thermal release coating lines running at 250–450 m/min on 12–50 µm corona-treated PET use RH-Vi306B at 5–15 wt% as a high-viscosity modifier blended with a low-viscosity vinyl-terminated dimethylsiloxane fluid. The blend shifts release force from a tight 5–10 cN/2 in peel to a medium 15–40 cN/2 in peel without increasing coat weight above 1.2 g/m². The premix is prepared in a 100-L nitrogen-purged vessel at 25–35 °C; rotor-stator shear is avoided because shear-induced heating above 45 °C activates the platinum complex and shortens bath life from 8 h to 2 h. The fluid is applied through a 5-roll solventless coater with anilox-to-roll pressure set at 0.15–0.25 MPa. Cure proceeds in a 120–150 °C hot air tunnel for 1.5–3.0 s, with residual SiH quenched by a 160 °C post-cure of 5 s. Release force is measured by 180° peel at 300 mm/min according to FINAT FTM 3, using TESA 7475 test tape; the failure mode must remain clean release, not zippy delamination or liner ghosting. When RH-Vi306B content exceeds 15 wt%, release force drifts upward by 8–15 cN/2 in after 24 h ageing at 40 °C, because unreacted high-molecular-weight species migrate to the coating-air interface and raise the coefficient of friction.
| Standard or regulation | Scope | Critical test or limit |
|---|---|---|
| FDA 21 CFR 175.300 | Resinous and polymeric coatings for food contact | Extraction limits for food simulants under 21 CFR 175.300 conditions |
| FDA 21 CFR 176.170 | Paper and paperboard in contact with aqueous and fatty foods | Soluble extractives limits for food-contact paper |
| EC 1935/2004 | Food contact materials framework | Overall migration 10 mg/dm² |
| REACH 1907/2006 | EU chemical registration | SVHC disclosure below 0.1 wt% |
| RoHS 2011/65/EU | Electrical and electronic equipment | Pb, Hg, Cd, Cr(VI), PBB, PBDE thresholds |
Two-roll mill compounding of high-consistency rubber introduces RH-Vi306B at 2.5 phr during the first pass, lowering mill roll sticking index sufficiently to allow 30–45 phr of D4-treated fumed silica to be added without a separate densification heat treatment at 170 °C. The base gum is a methyl-vinyl polysiloxane with 0.10–0.20 mol% vinyl groups; RH-Vi306B functions as a high-viscosity reactive plasticizer and increases total vinyl concentration, permitting a higher hydride crosslinker level without forming brittle cure sites. Mixing is completed on a 16-inch two-roll mill at 20–40 °C with a friction ratio of 1.2:1, followed by addition of 1.0–2.0 phr dichlorobenzoyl peroxide or 0.5–1.2 phr 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane for peroxide-cure systems. For addition-cure HCR, the vinyl fluid is combined with 0.4–0.8 php platinum catalyst and 2.5–5.0 php methylhydrogen siloxane. The compound is vulcanized in a 155–170 °C compression press for 8–15 min, then post-cured at 200 °C for 4 h to decompose peroxide residues and drive compression set below 15%. End products include automotive O-rings, spark plug boots, turbocharger hoses, and wire insulation. The compound is classified under ASTM D2000-18 callout M2 GE 505, with heat resistance to 200 °C, and tested for compression set per ISO 815-1:2019, tensile per ISO 37:2017, and tear per ISO 34-1:2022.
For 800-V power module encapsulation used in electric vehicle inverters, a low-modulus addition-cure silicone gel is prepared from 100 parts RH-Vi306B, 5–15 parts branched vinyl-functional polysiloxane, 3.0–8.0 parts hydride crosslinker, and 0.01–0.05 parts platinum-alkenylsiloxane complex. Mixed viscosity before cure is 1,000–4,000 mPa·s at 25 °C, permitting vacuum degassing at 0.05–0.1 kPa for 5–15 min without overflowing the module housing. Cure is performed at 80–120 °C for 30–90 min; lower cure temperature reduces wire-bond stress but extends cycle time and increases the risk of unreacted hydride causing post-cure hardness drift. The gel is formulated to a penetration hardness of 40–70 per ISO 2138:2015 or 20–50 Shore 00 per ASTM D2240-15(2021). Dielectric strength exceeds 18 kV/mm per IEC 60243-1:2013. Silane adhesion promoter is added at 0.5–1.5 wt%; addition beyond 1.8 wt% causes gel darkening at 150 °C from amine-catalyzed hydrolysis of the silicone backbone. The critical imbalance occurs when the SiH/Vi molar ratio exceeds 1.8:1: free hydride groups react with moisture, liberate hydrogen, and form bubbles at wire-bond interfaces, reducing partial discharge inception voltage below 1.2 kV per IEC 60664-1. Failure modes observed on production dispensing lines include catalyst poisoning by solder flux residues, hard spots at the gel-to-substrate interface from local SiH/Vi imbalance, and void formation when vacuum degassing is terminated above 0.2 kPa residual pressure. End products are IGBT modules, SiC MOSFET power modules, and high-reliability motor drive encapsulants. Flame retardancy is assessed per UL 94 V-0 at 2.0 mm; thermal conductivity remains below 0.20 W/m·K unless alumina filler is added.
To prevent cell coalescence at foam densities below 0.35 g/cm³, the partial replacement of a 1,000 mPa·s vinyl fluid with 6–10 wt% RH-Vi306B is carried out in a 50-L planetary mixer under 0.08 MPa vacuum. The higher extensional viscosity at the expanding cell walls delays coalescence and reduces the closed-cell to open-cell transition. The A-side contains 100 parts vinyl-terminated dimethylpolysiloxane, 3–8 parts RH-Vi306B, 10–25 parts fumed silica, 20–50 parts aluminum trihydrate, and 0.2–1.0 parts deionized water or 0.5–2.0 parts hydroxyl-containing dimethylsiloxane as the hydrogen source through reaction with SiH groups. The B-side contains 10–25 parts polymethylhydrogen siloxane and 0.2–0.6 parts platinum catalyst. Mixing is performed at 15–25 °C, and the material is cast or dispensed into FIPG grooves before expansion begins at 60–90 °C; the exothermic hydrosilylation peak is kept below 120 °C to prevent cell rupture. Foam stabilizers, typically 0.5–1.5 wt% low-molecular-weight hydroxyl-terminated dimethylsiloxane, are required to prevent foam collapse when RH-Vi306B exceeds 12 wt% because the high-viscosity continuous phase slows drainage and increases cell wall thickness. End products are fire-resistant battery pack gaskets, fuel cell seals, and thermal barrier sheets. Fire resistance is evaluated per UL 94 V-0 at 3.0 mm and EN 45545-2 R22/R23 hazard levels; compression set after 70 h at 100 °C remains below 30%.
Airbag and protective-apparel fabric coating operations introduce RH-Vi306B at 3–6 wt% into a two-part liquid silicone coating based on a 10,000 mPa·s vinyl polymer to control strike-through and surface gloss. The coating is applied by knife-over-roll with a gap of 0.05–0.12 mm on 100–350 g/m² polyamide or polyester fabric, followed by a 150–180 °C oven cure for 30–90 s. The higher-viscosity fraction raises low-shear viscosity from 30–60 Pa·s to 80–120 Pa·s, reducing fabric penetration by 20–40% as determined by cross-section microscopy. Coated fabric tear strength is tested per ISO 13937-3:2000, and tensile strength retention after 500 h at 150 °C is 70%. End products include automotive airbag seams, heat-protective aprons, and flexible heater insulation. Published data for this specific RH-Vi306B addition level is limited to mill trials; fabric should be pre-dried to 0.5% moisture, and amine-containing finishing agents must be avoided because they poison the platinum catalyst.
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Vinyl Silicone Oil RH-Vi306B is a linear polydimethylsiloxane bearing terminal vinyl functional groups. The product designation places it in the 300 mm²/s nominal kinematic viscosity class at 25 °C. The fluid is supplied as a clear, colorless liquid. Lot-level certificates are controlled by the following methods and typical ranges: kinematic viscosity by ASTM D445 within 270–330 mm²/s; density by ASTM D4052 within 0.965–0.975 g/cm³; refractive index by ASTM D1218 between 1.403 and 1.406; vinyl content between 0.45 wt% and 0.55 wt%; volatile content not exceeding 1.0 % after 3 h at 150 °C by ASTM D4559. The terminal vinyl groups participate in hydrosilylation with siloxane crosslinkers containing silicon-hydrogen bonds. The fluid therefore becomes covalently bonded to the cured elastomer network rather than remaining as a migratory diluent. This characteristic distinguishes it from non-reactive dimethyl silicone oils of similar viscosity.
| Property | Unit | Test method | Typical range |
|---|---|---|---|
| Kinematic viscosity at 25 °C | mm²/s | ASTM D445 | 270–330 mm²/s |
| Density at 25 °C | g/cm³ | ASTM D4052 | 0.965–0.975 g/cm³ |
| Refractive index at 25 °C | — | ASTM D1218 | 1.403–1.406 |
| Vinyl content | wt% | titration / supplier method | 0.45–0.55 wt% |
| Volatile content, 3 h at 150 °C | % | ASTM D4559 | ≤ 1.0 % |
In platinum-catalyzed addition-cure liquid silicone rubber, the controlling formulation variable is the total molar ratio of silicon-hydrogen crosslinker to vinyl functionality, reported as Si-H:SiVi. Addition of RH-Vi306B at 5–25 phr reduces compound viscosity but also consumes hydride equivalents. A total ratio below 0.8 can produce under-crosslinked parts with high compression set and surface tack; ratios above 1.5 can leave unreacted silicon-hydrogen groups that outgas hydrogen during post-cure. This is the primary processing-boundary risk for this fluid in fast-cure systems. The risk is largest when the base polymer itself contains high vinyl content, because the terminal-vinyl oil changes the molecular weight between crosslinks at the same Si-H:SiVi ratio.
High-speed liquid injection molding on a 1,200 kN clamp force machine with a cold-runner mold held at 150 °C benefits from lower injection pressure because the 300 mm²/s viscosity reduces pressure drop through the runner and gate. The magnitude of pressure reduction is mold-dependent and should be measured with cavity pressure transducers at addition levels of 10 phr. The cure rate does not automatically increase; the fluid dilutes initial platinum concentration and can extend moving die rheometer tc90 compared with a formulation containing only high-vinyl polymer. Each production lot must be qualified by ASTM D5289 at the intended mold temperature and 1° arc because small shifts in vinyl content alter cure time. Published data for this specific fluid in cold-runner liquid silicone rubber cycle times below 60 s is limited.
For high-consistency silicone rubber compounding on a co-rotating twin-screw extruder with L/D 44:1, RH-Vi306B is introduced after fumed silica pre-wetting. Barrel temperatures of 25–60 °C are sufficient for volumetric metering, and the fluid does not require preheating. If vinyl content drifts outside the 0.45–0.55 wt% certificate window, tensile strength and elongation measured by ISO 37:2017 respond more than plastication energy or die swell. The fluid functions as a reactive plasticizer during mixing and as a network extender during vulcanization. Replacement of non-reactive dimethyl silicone oil with RH-Vi306B changes vulcanization chemistry, not only compound rheology. Final compound viscosity should be recorded by ISO 289-1:2021 because silica dispersion and gum-filler interactions mask the additive effect. On open two-roll mills, the oil is added after the base gum has banded; addition before silica incorporation can reduce shear transfer and alter mix time, with the magnitude dependent on filler grade and roll temperature.
Fumed silica with surface area above 200 m²/g increases compound viscosity. RH-Vi306B lowers compound viscosity at addition levels up to 15 phr; the extent is determined by capillary rheometry ISO 11443:2021 and cannot be predicted from neat-fluid viscosity alone. The fluid is compatible with vinyl-functional silane-treated silica, but amine-containing silane surface treatments should be avoided because amine residues can poison platinum catalyst in the final compound. For precipitated silica compounds, water from filler surfaces can hydrolyze silicon-hydrogen crosslinker; pre-drying is required at moisture levels above 0.5 wt%.
Moving die rheometer testing at 170 °C and 1° arc separates plasticization from crosslink density. When RH-Vi306B replaces a non-reactive dimethyl silicone oil of similar viscosity, minimum torque ML can decrease because the fluid lowers compound viscosity before cure. Maximum torque MH does not show the same dilution depression because the terminal vinyl groups are consumed into the network. The difference between ML and MH should be used to adjust crosslinker level. In systems containing ethynylcyclohexanol-based inhibitors, the inhibitor competes with vinyl groups for platinum sites; total vinyl concentration therefore affects scorch time and cure rate. Amine-containing additives are avoided because they can poison platinum catalysts and delay vulcanization. Sulfur-containing additives are excluded because they inhibit hydrosilylation and generate odorous by-products. The fluid is not compatible with formulations that require ultraviolet-triggered platinum cure; interaction between photoacid generators and vinyl silicone oil can generate uncontrolled gelation. The apparent activation energy for cure can be estimated from ASTM D5289 runs at 150 °C, 170 °C, and 190 °C; published data for this specific product is limited and should be generated on the production compound.
Differences from other products are defined by reactivity, viscosity, and residual extractables. Non-reactive dimethyl silicone oil of 350 mm²/s viscosity remains migratory after cure and reduces crosslink density by dilution. A high-vinyl silicone oil containing 1.0–1.5 wt% vinyl increases network density and can embrittle the vulcanizate if used at high addition levels. Methyl phenyl silicone fluid raises refractive index above 1.410 and improves radiation stability but does not provide the same terminal-vinyl network incorporation. RH-Vi306B occupies a middle position: terminal reactivity without an excessive crosslink density contribution from a 300 mm²/s chain. This distinction is relevant when formulators seek to lower durometer without increasing extractables.
| Parameter | RH-Vi306B | Dimethyl silicone oil 350 mm²/s | High-vinyl silicone oil 1000 mm²/s |
|---|---|---|---|
| Kinematic viscosity at 25 °C | 300 mm²/s | 350 mm²/s | 1000 mm²/s |
| Vinyl content | 0.45–0.55 wt% | None | 1.0–1.5 wt% |
| Network incorporation | Terminal | None | Terminal/pendant |
| Extractables after cure | Low if fully cured | High if not extracted | Moderate |
Solventless platinum-catalyzed release coatings for polyethylene terephthalate film can use RH-Vi306B as a reactive viscosity reducer. At coat weights of 1.0–1.5 g/m², the fluid lowers formulation viscosity for precision metering rolls and participates in crosslinking at web temperatures from 120 °C to 160 °C. Because terminal vinyl groups react into the polyorganosiloxane network, residual extractables are lower than with non-reactive diluents; verification may use ISO 6427:2013 or a supplier extraction method. If cure is incomplete before winding, uncured terminal vinyl groups can migrate to the release surface and increase subsequent peel force. The influence of RH-Vi306B on release force must be measured at 180° peel angle and 300 mm/min peel speed using FINAT FTM 1 or equivalent; published data for this specific fluid in release liner systems is limited. Formulators should not assume linear release-force reduction; network topology and platinum level can shift peel values by more than the additive change alone.
Volatile content not exceeding 1.0 % after 3 h at 150 °C is relevant for sealing applications requiring low fogging. Cured articles intended for repeated food-contact use are assessed under FDA 21 CFR 177.2600 or BfR Recommendation XV. The neat fluid is not certified as a direct food additive; final-article migration limits are controlled by extractive testing according to the applicable national regulation. For sealing systems, compression set measured by ISO 815-1:2019 is affected by under-cure and unreacted hydride; a post-cure step at 200 °C for 4 h removes low-molecular-weight siloxanes and stabilizes the network. Storage in closed containers at 5–40 °C is recommended. Avoid strong acids, strong bases, and platinum poisons. Ambient moisture does not polymerize the neat fluid, but can hydrolyze residual silicon-hydrogen groups in formulated compounds.
In automotive gasket materials, the fluid is used to reduce compound viscosity without increasing compression set. The addition level is constrained by total volatile limits; typical formulations use 5–15 phr because higher levels can require longer post-cure. The cured vulcanizate must pass fuel or oil resistance tests specified by the end-user, not by the fluid itself.
For two-part room-temperature vulcanizing silicone potting compounds, RH-Vi306B is incorporated in the vinyl-containing Part A at 10–20 phr. Viscosity adjustment is achieved without adding non-reactive plasticizer. Pot life is governed by total inhibitor content and platinum concentration; each lot should be checked by bench-scale gel time measurement at 25 °C. Because the fluid contains terminal vinyl groups on a 300 mm²/s chain, it contributes to network extension without the hardness increase associated with branched pendant-vinyl fluids. The Si-H:SiVi ratio must be verified before scale-up because lot-to-lot variation in vinyl content can shift the curing profile by several seconds in fast-cycle injection molding. Equipment settings depend on base polymer, filler type, and part geometry; published data for this specific product configuration is limited.
Under REACH EC 1907/2006, the registration status of the neat fluid should be confirmed from the supplier safety data sheet because silicone polymers may be exempt as polymers but imported monomers and low-molecular-weight fractions are assessed separately. For electrical and electronic applications, cured compounds must meet RoHS Directive 2011/65/EU thresholds of 0.1 wt% for lead, mercury, hexavalent chromium, PBB, and PBDE, and 0.01 wt% for cadmium in homogeneous materials. These limits apply to the finished article, not to the neat fluid.
Storage in closed containers at 5–40 °C avoids moisture ingress and contamination. The fluid is thermally stable below 200 °C in the absence of catalysts, but exposure to strong acids, strong bases, or transition-metal residues can alter vinyl group integrity. When headspace oxygen is present over extended storage, viscosity drift should be monitored by ASTM D445. Production equipment should avoid brass and bronze wetted parts in systems containing platinum catalyst, because metal ions can reduce catalyst activity.
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