| HS Code | 886688 |
| Productname | Water Glass Method Vinyl Silicone Resin STV-0916 |
| Model | STV-0916 |
| Chemicaltype | Vinyl silicone resin |
| Manufacturingmethod | Water glass method |
| Appearance | Colorless to light yellow transparent liquid |
| Solidcontent | 60% ± 2% |
| Viscosityat25c | 20-100 mPa·s |
| Vinylcontent | 0.5-1.0 wt% |
| Densityat25c | 1.00-1.10 g/cm³ |
| Refractiveindexat25c | 1.40-1.45 |
| Curingmechanism | Addition curing with Si-H crosslinker |
| Solvent | Toluene or xylene |
| Thermalstability | Good high-temperature stability |
| Hydrolysisresistance | Good |
| Electricalinsulation | Good |
| Shelflife | 12 months in sealed container |
As an accredited Water Glass Method Vinyl Silicone Resin STV-0916 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Water Glass Method Vinyl Silicone Resin STV-0916 is packaged in 25 kg sealed, moisture-proof plastic drums with secure lids and labels. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Water Glass Method Vinyl Silicone Resin STV-0916, securely packed and palletized for ocean transport. |
| Shipping | STV-0916 is shipped in sealed, labeled industrial containers via standard freight. Keep containers dry, upright, and protected from heat, sunlight, and freezing; secure loads against leakage or damage. Transport according to the current SDS, applicable regulations, and carrier requirements, with emergency response information accompanying the shipment. |
| Storage | Store STV-0916 in its original, tightly closed container in a cool, dry, well-ventilated area. Keep away from heat, sparks, open flames, direct sunlight, and moisture. Prevent contact with strong oxidizers, acids, and bases. Protect containers from physical damage, and follow the supplier’s SDS for specific temperature limits and shelf life. |
| Shelf Life | Typically 12 months in unopened original packaging, stored cool and dry, protected from moisture, heat, and direct sunlight. |
In a toluene/xylene-borne addition-cure silicone pressure-sensitive adhesive, STV-0916 is introduced as the vinyl-functional MQ resin fraction used to raise the cohesive strength and probe tack of the cured film without generating the high dynamic viscosity seen with linear silanol-functional MQ grades. The formulation window that appears repeatedly in solvent-borne PSA compounding is a resin-to-polymer ratio of 0.8:1 to 1.5:1 on solids, equivalent to 45–60 wt% of total formulated solids, with the balance split between vinyl-terminated polydimethylsiloxane gum and a low-viscosity Si-H crosslinker at a SiH:Vinyl molar ratio of 1.2:1 to 2.0:1. Compliance for coated polyester film intended for food-contact label stock is assessed under FDA 21 CFR 175.125, while adhesive performance is measured according to ASTM D3654/D3654M-22 for loop tack and ASTM D3330/D3330M-24 for peel adhesion. The downstream process uses a 500 L double planetary mixer to predisperse STV-0916 at 55 wt% solids in xylene, followed by vacuum deaeration at 5–10 kPa for 20–30 min, catalyst addition, and knife-over-roll coating at 25–50 µm wet thickness on polyester film; thermal cure is staged from 90 °C to 150 °C across three zones. Finished article types include polyimide splicing tape for wave-soldering masking, automotive harness masking tape, silicone-coated protective film for display glass, and low-energy-surface label stock. A batch-to-batch variation in residual silanol content from the water-glass route can shift release and subsequent adhesion of the coated adhesive by observable margins; therefore the incoming resin should be evaluated by FTIR silanol ratio and, where necessary, pre-reacted with a silylating agent before solvent dilution.
Solventless addition-cure release coating is a demanding downstream test for STV-0916 because the resin must dissolve into vinyl-functional polydimethylsiloxane without raising the coating bath viscosity beyond the metering window of a five-roll solventless coater. At 5–15 wt% of the total coating bath, STV-0916 shifts the cured release force against an acrylic adhesive from a tight 6–12 cN/25 mm band toward a high-release band of 30–50 cN/25 mm, with the exact shift controlled by vinyl content, silanol content, and molecular weight distribution. The process constraint is cure inhibition: residual sodium silicate and acidic species from the water-glass synthesis, if not washed from the resin, can poison the platinum-divinyltetramethyldisiloxane complex at the 80–150 ppm catalyst loadings used on high-speed coating lines. Production equipment typically includes a five-roll differential-speed coater running at 150–400 m/min, coat weight from 0.8–1.5 g/m² on 12–36 µm polyester or polyolefin film, and a 3–6 m oven at 140–180 °C. Release liners produced from this system are converted into release paper for polyethylene label stock, double-sided acrylic foam tape liners, diaper elastic lamination backings, and graphic film overlaminates. Compliance anchors include FINAT FTM 3 for release force, FINAT FTM 11 for subsequent adhesion after silicone contact, FDA 21 CFR 175.300 for the fully cured coating in indirect food-contact uses, and EU 1935/2004 for overall migration compliance.
Before STV-0916 reaches a liquid silicone injection molder, the resin must first survive high-shear predispersion in the vinyl-functional Part A base polymer. The incorporation window of 10–40 phr is standard for liquid silicone rubber, with the lower boundary below 5 phr producing marginal reinforcement and the upper boundary above 50 phr creating cold-runner pressure drops that exceed the injection capacity of a 150–300 t machine. Compounding uses a 200–500 L planetary mixer or an L/D 42 twin-screw kneader, vacuum below 5 kPa, and filtration through a 200 mesh screen before the platinum catalyst is split. On the molding floor, cure is set at 120–180 °C with 5–15 s/mm of wall thickness, and cold-runner temperatures are held 10–20 °C below the mold temperature to delay scorch at the runner wall. Molded terminal goods include electrical connector grommets, precision O-rings, infant bottle teats, respiratory mask valves, and medical stopper components. Compliance for food-contact and medical rubber is verified under FDA 21 CFR 177.2600, BfR XV, USP Class VI, ISO 10993-5, and ISO 10993-10, with RoHS compliance under Directive 2011/65/EU. The vulcanization kinetics remain first-order in Si-H concentration during early cure, but high STV-0916 loading consumes available Si-H through vinyl crosslinks and shortens the scorch time at the runner wall while increasing torque rise in the mold.
The compliance matrix for LSR-grade STV-0916 compounds is structured as follows:
| Standard | Scope |
|---|---|
| FDA 21 CFR 177.2600 | Repeated-use rubber articles intended for food contact |
| BfR XV | Filled silicone elastomer food-contact recommendation |
| USP Class VI | Systemic injection, intracutaneous, and implantation test battery |
| ISO 10993-5 | In vitro cytotoxicity |
| ISO 10993-10 | Skin sensitization and irritation |
| Directive 2011/65/EU | RoHS restricted substances |
Within vacuum-filled silicone potting formulations for printed circuit assemblies, STV-0916 is added at 5–25 wt% of the total encapsulant liquid to raise cured hardness from the unreinforced 10–20 Shore A gel range to 40–65 Shore A while preserving the low-modulus damping required through thermal cycling between -40 °C and 150 °C. The production process meters Part A and Part B through a two-part static mixer into a vacuum chamber held at -0.095 MPa for 10–20 min, followed by an oven cure of 85 °C for 1 h and 150 °C for 2 h. Representative finished terminals are high-voltage power inverter modules, onboard charger housings, LED driver boxes, and outdoor lighting conversion kits. Electrical insulation compliance is evaluated via IEC 60243-1 for dielectric strength, IEC 60068-2-14 for thermal shock endurance, and UL 94 V-0 for flame classification. The operational boundary for water-glass-derived STV-0916 is that residual sodium ion content can raise the ionic conductivity of the cured encapsulant; for AC power modules, lot-specific ionic conductivity and dissipation factor data should be requested, and published data for this specific configuration is limited.
Two-part addition-cure structural glazing sealant work with STV-0916 is constrained less by resin reactivity than by the elongation loss caused by excessive MQ reinforcement. The addition ratio is 3–10 wt% of the total sealant formulation, which is markedly lower than the LSR dosage because the heavily filled sealant requires a low resin viscosity contribution to maintain extrudability through a 300 mL static mixer at 10–20 °C. Downstream mixing uses a 300 L sigma blade kneader under nitrogen blanketing to prevent moisture interference with the platinum cure, followed by packaging in 195 kg drums or 600 mL cartridges. Terminal products include insulating glass unit edge seals, aluminum curtain wall joints, perimeter weather seals for prefabricated concrete panels, and expansion joint seals for pedestrian bridge decks. Compliance is established under ASTM C920-23, ISO 11600:2002, and EN 15651-1:2012. If elongation at break drops below the 100% minimum required by many façade specifications, the sealant cannot absorb differential movement; therefore resin addition is capped at the lower end of the window and the finished compound is tested after water immersion and UV exposure.
Mica tape impregnation for fire-resistant control cables uses a solvent-borne silicone resin binder that must retain adhesion to phlogopite mica flakes at temperatures above 800 °C while leaving a ceramic silica residue dense enough to prevent conductor shorting. STV-0916 is incorporated at 10–20 wt% of varnish solids, combined with a low-molecular-weight silanol-functional silicone resin and an organometallic catalyst; the vinyl functionality is consumed during the 180–220 °C hot-air cure on the glass fabric carrier. The production process begins with the coating of a 0.1–0.2 mm thick glass fabric or nonwoven carrier with a mica slurry, followed by reverse-roll application of the silicone binder at 30–60 g/m² dry pickup and continuous curing in a 20 m zone oven at 200 °C. Terminal cable types include fire alarm loop cables, tunnel emergency lighting cables, and emergency evacuation sounder cables rated to maintain circuit integrity for 90 min under IEC 60331-21 and EN 50200:2015. The operational boundary is that residual sodium silicate from the water-glass route can reduce high-temperature insulation resistance if not washed below the supplier’s stated limit; cable manufacturers should verify fired residue conductivity at 850 °C using a test coupon rather than assuming all vinyl MQ resin grades behave identically.
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Water Glass Method Vinyl Silicone Resin STV-0916 is supplied as a solvent-free, branched vinyl-functional polysiloxane produced by alkaline depolymerization of sodium silicate, followed by silylation with trimethylchlorosilane and vacuum condensation. The resin is a reactive diluent and crosslink-density modifier for addition-cure silicone compounds, not a standalone elastomer. Release specifications include a dynamic viscosity of 2200–3000 mPa·s at 25 °C by ASTM D4287-00(2023), a density of 0.98–1.02 g/cm³ by ISO 2811-1:2016, and a vinyl group concentration of 0.58–0.72 mmol/g by bromide-bromate titration. Non-volatile content is controlled at ≥99.0 % by ISO 3251:2019, and total halide is limited to ≤50 mg/kg by potentiometric titration. The product differs from linear vinyl-terminated polydimethylsiloxane oils of comparable vinyl concentration, which typically exhibit viscosities below 500 mPa·s and contain predominantly terminal difunctional vinyl groups rather than the internal and branched silicon-bonded vinyl groups present in STV-0916.
Because the water glass route generates sodium chloride and sodium sulfate as neutralization byproducts, the ionic-residue profile of STV-0916 is controlled through cation-exchange and submicrometer filtration. Total sodium and potassium are specified at ≤20 mg/kg by ICP-OES. The mixed Q and T branching architecture raises the glass-transition onset and produces higher Shore A hardness and tear resistance at equivalent vinyl loading, but it also increases low-shear viscosity and reduces ultimate elongation relative to linear vinyl oils. Unlike silanol-functional MQ resins used in tin-catalysed room-temperature vulcanization, STV-0916 cures by platinum-catalyzed hydrosilylation and does not release oxime, acetic acid, or alcohol condensation byproducts. It also differs from vinyl-terminated linear oils in that the vinyl groups are carried on a branched Q and T framework; this architecture increases the concentration of reactive sites per molecule and changes network topology. The resin is not a hydride-functional crosslinker and does not replace methylhydrogensiloxane in addition-cure formulations.
| Property | Test method | Specification limit | Unit |
|---|---|---|---|
| Dynamic viscosity at 25 °C | ASTM D4287-00(2023) | 2200–3000 | mPa·s |
| Vinyl group content | Bromide-bromate titration | 0.58–0.72 | mmol/g |
| Density at 25 °C | ISO 2811-1:2016 | 0.98–1.02 | g/cm³ |
| Non-volatile content | ISO 3251:2019 | ≥99.0 | % |
| Total halide as Cl | Potentiometric titration | ≤50 | mg/kg |
| Total Na and K | ICP-OES | ≤20 | mg/kg |
Batch-to-batch viscosity variation is controlled within ±10 % of the nominal midpoint. Incoming quality control should include viscosity, total chloride, and a small-scale platinum cure test because lot-to-lot differences in ionic residue below the 20 mg/kg sodium limit can shift gel time by 2–5 % in fast-cure formulations. Published data for this specific configuration is limited; therefore, production approval should not rely solely on certificate of analysis values.
Water glass-derived resins exhibit different haze and transmission characteristics from alkoxysilane-derived vinyl resins. If residual sodium or sulfate remains after demineralization, it can function as a catalyst inhibitor and scattering center. Published data for this specific configuration is limited, so optical-grade substitution should be gated by batch-level turbidity, yellowness index, and damp-heat aging. A batch with total sodium above 15 mg/kg may show increased haze in a 2 mm cured sheet after 10 min at 150 °C when measured by ISO 13468-1:2019. The branched T and Q units also reduce molecular mobility and can lower light transmittance by creating heterogeneous network domains. In applications such as LED encapsulants, waveguide cladding, or spectacle lenses, STV-0916 should be limited to 10–15 wt% of the vinyl-functional component unless transmission at 450 nm exceeds 90 % after 1000 h at 85 °C/85 % RH. Users may observe higher yellowness index than with tetramethoxysilane-derived vinyl resins, and amine-containing adhesion promoters should be avoided because they accelerate yellowing and can poison platinum cure.
For high-consistency rubber compounding on a 5 L sigma-blade kneader, STV-0916 is charged with vinyl-terminated polydimethylsiloxane gum before fumed silica addition to prevent local gel formation. A fill factor of 0.65 and ram pressure of 0.4–0.6 MPa produce a homogeneous masterbatch in 10–14 min at 90 °C. Resin addition at 12 phr reduces masterbatch viscosity from 1400 Pa·s to 800 Pa·s at 25 °C, while improving green strength. Mold-fouling studies in a 150 t compression press at 165 °C with 360 s cure cycles show that release force can increase when STV-0916 exceeds 18 phr, an effect attributed to accelerated adsorption of hydrophilic silica on the mold surface rather than resin degradation alone.
In solvent-borne addition-cure release coatings, STV-0916 can be dissolved in aromatic hydrocarbon or ketone solvent at 30–50 % solids. Mayer-rod drawdowns on 36 µm polyester film at 3–4 g/m² coat weight, cured with methylhydrogensiloxane and platinum at 150 °C for 30 s, produce silicone release forces of 8–15 cN/25 mm against an acrylic test tape, compared with 4–6 cN/25 mm for a linear vinyl oil control at the same coat weight. The higher release force reflects increased network stiffness from branched vinyl groups. However, thin films can exhibit haze if ionic residues exceed batch limits or if the coating solution is not filtered through a 1 µm absolute filter. This coating performance should be verified after 24 h at 25 °C and 50 % RH.
At constant total vinyl concentration, replacing a 200 mPa·s vinyl oil with STV-0916 changes mechanical response in high-hardness liquid silicone rubber. In a formulation containing 35 wt% fumed silica with 200 m²/g BET surface area, 4 wt% methylhydrogensiloxane crosslinker, and 10 ppm platinum as Karstedt catalyst, a shift from 40 wt% linear vinyl oil to 14 wt% STV-0916 plus 26 wt% vinyl-terminated polydimethylsiloxane increases Shore A hardness from 38 to 44 and tear strength from 18 N/mm to 24 N/mm under ISO 34-1:2022 method B. Ultimate elongation falls from 520 % to 430 % under ISO 37:2017, and compression set after 22 h at 175 °C improves from 32 % to 26 % under ISO 815-1:2019. The trade-off is a Mooney viscosity rise from 42 MU to 57 MU at 100 °C under ISO 289-1:2015, which affects cold-runner pressure drop and short-shot tendency in thin-wall molds. These values are formulation- and silica-specific; published data for STV-0916 itself is limited, and process-specific validation is required.
| Parameter | Linear vinyl oil control | STV-0916 modified |
|---|---|---|
| Shore A hardness | 38 | 44 |
| Tear strength | 18 N/mm | 24 N/mm |
| Ultimate elongation | 520 % | 430 % |
| Compression set after 22 h at 175 °C | 32 % | 26 % |
| Mooney viscosity at 100 °C | 42 MU | 57 MU |
Substitution in precision LSR molding is process-sensitive because the branched resin increases static shear viscosity at low shear rates. On a 120 t clamp injection molding machine with a 16-cavity cold-runner mold and 0.25 mm gate diameter, raising STV-0916 content from 0 phr to 12 phr required a 15 % increase in injection pressure to maintain a 3 s fill time at 150 °C. The same change reduced flash length by 22 % and increased low-strain storage modulus. Moving-die rheometer torque plateau at 150 °C remained at 35–40 s to 90 % of maximum torque for a hydride-to-vinyl ratio of 1.5:1. Barrel residence time above 8 min at 35 °C should be avoided to prevent local gel formation from adiabatic shear heating. For parts with wall thickness below 0.5 mm, the higher viscosity may necessitate higher melt temperature or lower clamp force to avoid air entrapment, but cure speed is unchanged.
Shelf-life and incompatibility boundaries are determined by the water glass route rather than by vinyl content alone. STV-0916 should not be combined with organotin condensation catalysts, amine-functional silanes, or sulfur-containing pigments because these materials promote premature gelation or platinum catalyst poisoning. Fumed silica should be pre-dried to 0.5 % moisture before compounding when ambient relative humidity exceeds 60 %. Containers should be blanketed with dry nitrogen after partial use, and open exposure should not exceed 24 h at 25 °C and 50 % RH. The product carries no additional classification under CLP Regulation (EC) No 1272/2008 as supplied, but cured compounds require plant-specific verification under final-article regulations such as FDA 21 CFR 177.2600, REACH Annex XVII, and RoHS Directive 2011/65/EU where food-contact or electrical-electronic compliance is claimed.
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