| HS Code | 744085 |
| Productname | Methyl Terminated Hydrogen Branched Silicone Oil RH-H86 |
| Chemicalcomposition | Methylhydrogen polysiloxane with methyl-terminated and branched structure |
| Appearance | Colorless to light yellow transparent liquid |
| Viscosityat25c | 20-100 mPa.s (typical) |
| Hydrogencontent | 0.7-1.0 wt% (typical) |
| Densityat25c | 0.98-1.00 g/cm3 (typical) |
| Refractiveindexat25c | 1.405-1.410 (typical) |
| Flashpoint | >=120 C (typical) |
| Volatilematter | <=2 wt% (typical) |
| Activecontent | >=99 wt% |
| Solubility | Soluble in toluene, xylene and petroleum ether; insoluble in water |
| Ph | 6-8 (typical) |
As an accredited Methyl Terminated Hydrogen Branched Silicone Oil RH-H86 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Methyl Terminated Hydrogen Branched Silicone Oil RH-H86 is supplied in 200 L steel drums, sealed and labeled for safe handling. |
| Container Loading (20′ FCL) | RH-H86 silicone oil loaded in 20′ FCL: palletized, strapped, labeled, documented, and container sealed for safe transport. |
| Shipping | Ship RH-H86 in original, tightly sealed containers under cool, dry, ventilated conditions, protected from heat, sunlight, and moisture. Avoid contact with oxidizers, acids, bases, and water. Keep containers closed and secure during transport; use appropriate labeling and verify hazardous-goods classification before shipment. |
| Storage | Store Methyl Terminated Hydrogen Branched Silicone Oil RH-H86 in a cool, dry, well-ventilated area away from heat, sparks, open flames, and oxidizing agents. Keep containers tightly closed and upright to prevent moisture contamination and hydrogen gas accumulation. Protect from direct sunlight and freezing. Use explosion-proof ventilation where necessary. Store separately from acids, bases, and incompatible materials. Follow local regulations and the manufacturer’s SDS. |
| Shelf Life | Shelf life is 12 months in original sealed containers, stored cool, dry, and away from direct sunlight. |
On solventless addition-cure release coating lines operating on biaxially oriented polypropylene and supercalendered kraft paper, methyl terminated hydrogen branched silicone oil RH-H86 is split into the catalyst-containing part at 2.0 wt% to 4.5 wt% of total coating solids. The Si-H to vinyl molar ratio is maintained between 1.6:1 and 2.2:1 against a vinyl-terminated dimethylsiloxane fluid of 2000 mPa·s to 6000 mPa·s at 25 °C. Karstedt platinum catalyst is held at 50 ppm to 120 ppm Pt, with inhibitor-controlled bath life of 6 h to 24 h at 35 °C. The five-roll coater transfers the solventless bath at 30 °C to 40 °C and applies 0.8 g/m² to 1.4 g/m² dry coat weight onto corona-pretreated substrate with surface energy of 40 dyn/cm to 44 dyn/cm. The oven is zone-differentiated: 110 °C for 4 s to 6 s, 140 °C for 6 s to 10 s, and 150 °C for 5 s to 8 s. Total high-temperature dwell below 8 s causes residual Si-H transfer to acrylic adhesive and produces wet-out failure. Compliance for food-contact release liners is assessed under FDA 21 CFR 176.170 and FDA 21 CFR 176.180; EU 1935/2004 Article 3 applies to overall migration from the coated article. Pharmaceutical transdermal liners are additionally evaluated under ISO 10993-5:2009 because the release surface contacts skin. Finished product types include single-sided release liners for pressure-sensitive adhesive labels, double-sided differential release liners for hygiene articles, and filmic release carriers for medical transdermal delivery systems. Paper substrates must be pre-dried to moisture below 4% when relative humidity exceeds 60%, because water consumes Si-H and shifts the effective stoichiometry lower.
Because two-part liquid silicone rubber compounding has a narrow processing window, excess Si-H produces surface bloom and insufficient Si-H leaves uncrosslinked vinyl domains. RH-H86 is dosed into the B component at 1.2 phr to 2.5 phr, corresponding to an Si-H to vinyl molar ratio of 1.4:1 to 1.8:1 across the mixed compound. Ethynyl cyclohexanol inhibitor is held at 0.2 wt% to 0.5 wt% to balance pot life and mold cure. The mixed material is injected through a static mixer with 12 to 24 elements at 150 bar to 250 bar into tooling maintained at 110 °C to 190 °C, with cycle time of 30 s to 60 s. If the Si-H to vinyl ratio drops below 1.2:1, compression set after 22 h at 175 °C exceeds 25% under ISO 815-1:2014, and the part surface retains a tacky film. If the ratio exceeds 2.2:1, post-cure hardening is observed as Shore A increase of 3–5 points over 7 days at 60 °C due to reaction of residual Si-H with moisture. Mechanical properties are evaluated under ISO 37:2017 and ASTM D2240-15; biomedical grades are tested under ISO 10993-5:2009 and USP Class VI. Repeated food contact articles reference FDA 21 CFR 177.2600. Production-scale failure modes include unmixed streaks caused by damaged static mixer elements and accelerated scorch in hot-runner sections above 80 °C when inhibitor content is below 0.15 wt%. Terminal parts include medical syringe stoppers, automotive connector seals, infant feeding components, and membrane keypad covers.
Aqueous emulsification of RH-H86 before pad application imposes a narrow pH range because hydrogen siloxane emulsions coalesce under alkaline conditions. The pad bath contains 5 g/L to 20 g/L RH-H86, a nonionic emulsifier at 20% to 30% based on silicone oil, and a zinc carboxylate catalyst at 0.1% to 0.3% on oil. Bath pH is adjusted to 5.0 to 5.5 with acetic acid. Polyester and nylon 6,6 filament fabrics are padded at 70% to 80% wet pickup and dried/cured on a stenter frame at 150 °C to 170 °C for 60 s to 120 s. Under these conditions the Si-H groups react with surface hydroxyl and polyamide terminal groups to form a crosslinked hydrophobic film that retains substrate hand. Spray rating is evaluated under ISO 4920:2012, with production targets above 90 on the spray rating scale. Durability after 10 home laundry cycles is assessed by AATCC TM22, and compliance is screened against OEKO-TEX Standard 100 Annex 4 limits for extractable silicones and residual catalyst. REACH EC 1907/2006 registration duties apply to imported formulations containing unreacted cyclic siloxanes above 0.1%. Finished goods include outdoor jackets, technical workwear, luggage shells, and tent fabric. If the fabric contains residual alkaline detergent above pH 8.0, emulsion destabilization appears as spotty water marks after curing.
During the hydrosilylation of allyl-terminated polyether onto Si-H sites, the exothermic addition reaction requires controlled dosing to avoid reactor temperature excursions above 120 °C. RH-H86 provides a branched backbone that raises the number of Si-H sites per molecule relative to linear methylhydrogen siloxane of similar viscosity. The reaction is conducted with a molar Si-H to allyl double bond ratio of 1.05:1 to 1.15:1, using Karstedt catalyst at 3 ppm to 10 ppm Pt. Allyl polyether is fed over 2 h to 4 h into a jacketed glass-lined vessel maintained at 80 °C to 120 °C with nitrogen sparge. After addition, vacuum stripping at 10 mbar and 120 °C for 1 h removes low-boiling unreacted polyether and cyclics. Residual Si-H is monitored by iodometric titration; residual allyl content is measured via iodine value decrease. The resulting polyether-modified branched silicone is then formulated with hydrophobic silica and emulsified for use as a pulp mill defoamer at 0.5 wt% to 2.0 wt% of active silicone in the final emulsion. OECD 301F ready biodegradability screening is applied to the unreacted fraction; REACH EC 1907/2006 registration and downstream substance evaluation obligations apply. The terminal products include polyurethane foam cell stabilizers, pulp and paper defoamers, and waterborne coating anti-crater additives. Amine catalysts and alkoxy silanes are incompatible in the same reactor because they can promote Si-H condensation and gelation before allyl addition is complete.
| Application | Standard designation | Addition level | Process equipment |
|---|---|---|---|
| Solventless release coatings | FDA 21 CFR 176.170; FDA 21 CFR 176.180; EU 1935/2004 | 2.0–4.5 wt% of coating solids | Five-roll coater, 110–150 °C zone oven |
| Addition-cure LSR | ISO 815-1:2014; ISO 37:2017; USP Class VI | 1.2–2.5 phr | Static mixer, 12–24 elements, injection molding at 150–250 bar |
| Textile hydrophobic finishing | ISO 4920:2012; AATCC TM22; OEKO-TEX Standard 100 | 5–20 g/L pad bath | Pad mangle, stenter frame at 150–170 °C |
| Filler hydroxyl blocking | RoHS 2011/65/EU; IEC 60811-501; ISO 787-9:2019 | 0.8–2.0 wt% on filler dry mass | Henschel mixer at 120–140 °C |
Precipitated silica and aluminum trihydrate filler treatment for high-voltage cable compounds requires surface modification that survives twin-screw compounding at 200 °C to 240 °C. RH-H86 is introduced into a Henschel mixer at 0.8 wt% to 2.0 wt% based on filler dry mass after the filler has been pre-dried to moisture below 0.5%. Mixing continues at 120 °C to 140 °C for 30 min to 60 min to allow silanol condensation and Si-H addition at the filler surface. The treated filler is then compounded into EPDM cable jacket or halogen-free flame-retardant polyolefin, where the branched Si-H structure reduces hydrogen migration into the base polymer and limits secondary oxidation at the conductor interface. RoHS 2011/65/EU substance restrictions apply to the formulated compound; IEC 60811-501 thermal ageing and ISO 787-9:2019 aqueous suspension pH are used to confirm filler surface coverage and process consistency. Published dynamic coefficient of friction data for this exact branched architecture in cable compounds is limited; therefore incoming friction testing is recommended on a two-roll mill before production scale-up. Terminal product types include treated precipitated silica for HTV silicone compounds, aluminum trihydrate for EPDM cable jacket, and coated mineral fillers for low-smoke zero-halogen cable insulation.
In phenyl silicone optical encapsulant formulations, RH-H86 is selected because the methyl-terminated branched architecture and hydrogen functional sites reduce the concentration of volatile cyclic siloxanes that deposit on LED dies during thermal cure. The addition level is 2.0 wt% to 5.0 wt% of the total silicone resin, with Si-H to vinyl molar ratio held at 1.2:1 to 1.6:1. Platinum catalyst is used at 5 ppm to 15 ppm, and the resin is degassed under -0.095 MPa vacuum for 10 min before dispensing. Cure profile is 100 °C for 1 h followed by 150 °C for 2 h; moisture in the resin must be below 200 ppm to avoid Si-H hydrolysis and bubble formation. Hardness is measured under ASTM D2240-15, and flame retardancy is verified under UL 94 V-0 at 2.0 mm thickness. Optical transmittance retention after 1000 h at 150 °C is monitored per internal reliability protocols because published data for this specific branched Si-H fluid in phenyl encapsulants is limited. Terminal products include LED leadframe packages, optocoupler housings, and MEMS sensor encapsulants. Residual platinum content above 20 ppm combined with sulfur-containing external adhesives can cause cure inhibition at the interface.
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Designated RH-H86, the methyl-terminated hydrogen branched silicone oil is a reactive organosilicon fluid in which silanic hydrogen is distributed across a branched siloxane framework and the chain ends are methyl-capped. Methyl termination removes terminal silanol condensation pathways; the branched architecture supplies polyfunctional Si–H nodes that participate in platinum-catalysed hydrosilylation with vinyl-functional silicones. The product is therefore positioned as a crosslinker or reactive modifier in addition-cure elastomers, solventless release coatings, non-aqueous defoamers, and filler surface hydrophobation. Table 1 summarises the typical quality-control envelope supplied with batch documentation. Because published data for this specific grade remain limited, acceptance limits should be confirmed against the active certificate of analysis.
The silanic hydrogen content is routinely measured by iodometric titration because addition-cure formulations require precise SiH:SiVi metering. Batch-to-batch variation in Si–H content affects modulus, adhesion, and scorch behaviour; therefore, the titration result is normalised to solids content before mixing. Kinematic viscosity at 25 °C is not sufficient to infer branching density because a low-viscosity branched fluid may carry more reactive nodes per gram than a higher-viscosity linear fluid. Refractive index and density are used as rapid identity checks to detect contamination by linear or cyclic siloxanes.
| Property | Method | Typical acceptance window |
|---|---|---|
| Appearance | Visual inspection | Clear, colourless to faint-yellow liquid |
| Kinematic viscosity at 25 °C | ASTM D445 / ISO 3104 | 20–80 mm²/s |
| Density at 25 °C | ISO 2811-1 | 0.980–1.000 g/cm³ |
| Refractive index at 25 °C | ISO 2807 | 1.395–1.405 |
| Silanic hydrogen content | Iodometric titration | 0.70–0.90 wt% |
| Volatile fraction, 3 h, 150 °C | ISO 3251:2019 | ≤1.0 wt% |
| Flash point, Cleveland open cup | ASTM D92 / ISO 2592 | ≥150 °C |
In platinum-catalysed addition cure, the hydride donor reacts with a vinyl-functional polydimethylsiloxane. Because RH-H86 carries multiple Si–H sites per molecule, the Flory-Stockmayer gel condition is reached at a lower conversion of vinyl groups than would be observed with a linear poly(methylhydrosiloxane) of equal Si–H weight fraction. This is a consequence of average hydride functionality, not total Si–H concentration alone. The stoichiometric SiH:SiVi ratio is normally maintained between 1.2:1 and 2.0:1; at 2.5:1 or above, residual hydride can contribute to post-cure hardening or hydrogen release under hot processing.
The resulting network typically exhibits higher modulus, lower compression set after thermal aging, and lower extractable non-crosslinked siloxane. Tensile stress at break is evaluated by ASTM D412-16, tear resistance by ASTM D624-20, compression set by ASTM D395-18, and indentation hardness by ASTM D2240-15e1 or ISO 48-4:2018. These properties are not controlled by total Si–H alone; the branch-point distribution shifts vulcanization kinetics from a chain-extension-dominated profile to a crosslinking-dominated profile. When the vinyl content of the base polymer is 0.15–0.30 mmol/g, typical RH-H86 use levels fall between 1.5 wt% and 3.0 wt%; for harder compounds above Shore A 60, use levels up to 4.5 wt% are used only after pot-life and scorch revalidation. Gelation can be followed by oscillatory rheometry as the crossover of storage and loss modulus; frequency sweeps at small strain are used to confirm plateau behaviour in the cured network.
Filler hydrophobation with RH-H86 occurs through reaction of Si–H with surface silanols on fumed silica. A typical planetary-mixer cycle charges silica under nitrogen, heats to 80–120 °C, and meters RH-H86 at 2–6 wt% relative to filler; mixing continues until hydrogen evolution subsides. The treated silica exhibits lower moisture pickup and disperses into silicone bases with lower yield stress than untreated filler.
Liquid silicone rubber compounds formulated with RH-H86 are processed on injection molding machines with clamp forces commonly between 1,000 kN and 2,500 kN. Barrel temperatures are held below 35 °C to prevent premature hydrosilylation, while mold temperatures are set at 120–180 °C depending on part thickness. The branched hydride donor reacts rapidly with vinyl silicone in the presence of Karstedt catalyst at 2–10 ppm platinum; inhibitor levels based on 1-ethynyl-1-cyclohexanol are typically adjusted between 0.02 wt% and 0.20 wt%.
A narrow processing window arises because higher branch content lowers gel time. Batch-to-batch variation in Si–H content of ±0.05 wt% can shift gel time at 120 °C by 15–25 s in a given formulation. For this reason, mixing records should capture specific energy and final compound temperature. On planetary or twin-screw mixers, RH-H86 is preferably metered during the final third of the mixing cycle after filler wetting is complete. Scorch appears as an unplanned viscosity rise before injection; if viscosity increases by more than 20% over 30 min at 25 °C, the batch requires reformulation or rejection. Vented barrels are not recommended because residual hydrogen from side reactions may create porosity.
Storage and handling limits should be explicit. Contact with strong bases, amines, or tin condensation catalysts can consume Si–H and liberate hydrogen. Containers should remain sealed under nitrogen at temperatures below 40 °C. At relative humidity above 60%, headspace purging and pre-drying of transfer lines are recommended even though methyl capping improves hydrolytic stability. The platinum catalyst should not be added until all components are homogeneous and the inhibitor is present.
RH-H86 is not compatible with amine-functional silane adhesion promoters at processing temperatures because amine-catalysed Si–H reactions can cause hydrogen evolution and voiding. Tin carboxylates and titanates used in condensation cure can also consume Si–H; therefore, separate containers and transfer lines are required when addition-cure and condensation-cure products run on the same production line. For solvent-based formulations, toluene and xylene are accepted carriers, but ketones and alcohols should be avoided because active hydrogen can interact with carbonyl oxygen or hydroxylic solvents under acidic or basic conditions.
Low-molecular-weight cyclic and linear siloxanes contribute to outgassing, surface tack, optical haze, and electrical contact failure. RH-H86 is selected in some applications because its branched structure reduces the concentration of low-molecular-weight species compared with linear polymethylhydrosiloxane of equivalent viscosity. Migration kinetics in cured networks are influenced by both the starting volatile fraction and the degree of crosslinking; a highly crosslinked network suppresses diffusion of unreacted siloxane oligomers. Outgassing is screened by thermal gravimetric analysis or by ASTM E595 where condensed volatiles must be controlled; total volatile fraction by ISO 3251:2019 is typically below 1.0 wt% after 3 h at 150 °C. This lower fugitive profile is relevant in optoelectronic adhesives, sealed enclosures, and precision release liners where surface contamination is controlled.
Linear trimethylsilyl-terminated polymethylhydrosiloxane fluids provide pendant Si–H but lack branch points; they act primarily as chain extenders and generate lower crosslink density at equal SiH:SiVi ratio. Hydroxy-terminated hydride fluids carry terminal silanol groups that can condense, releasing water and introducing storage instability. RH-H86 combines methyl-capped chain ends with branch points, so its gel threshold is lower than that of a linear fluid of equal Si–H weight fraction, while its terminal groups remain hydrolytically stable. Table 2 summarises the comparative profile.
| Parameter | RH-H86 branched methyl-terminated | Linear trimethylsilyl-terminated PMHS | Hydroxy-terminated hydride fluid |
|---|---|---|---|
| Terminal group | Methyl | Methyl | Silanol |
| Backbone architecture | Branched T/Q units | Predominantly linear D units | Low degree of branching |
| Kinematic viscosity at 25 °C | 20–80 mm²/s | 10–100 mm²/s grade-dependent | 15–50 mm²/s |
| Silanic hydrogen content | 0.70–0.90 wt% | 0.10–1.60 wt% grade-dependent | 0.30–1.20 wt% grade-dependent |
| Volatile fraction | ≤1.0 wt% by ISO 3251:2019 | 2–6 wt% volatile low-molecular-weight fractions have been reported for low-viscosity grades | Variable; silanol condensation can release water and low oligomers |
| Storage stability | Hydrolytically stable end groups | Hydrolytically stable end groups | Silanol condensation can progress at elevated temperature |
| Main addition-cure effect | Increases crosslink density and reduces migration | Extends chain length with lower modulus increase | Introduces condensation pathway; used in dual-cure systems |
In a direct comparison, a branched hydride at 0.75 wt% Si–H produces greater hardness increase than a linear fluid at the same SiH:SiVi ratio because the number of elastically active network strands per unit volume increases with branch functionality. Conversely, linear fluids are preferred where chain extension and low modulus are required. Hydroxy-terminated fluids are used in condensation-cure systems where silanol reactivity is desirable; they are not direct drop-in replacements for RH-H86 in platinum-catalysed addition cure because terminal silanol can consume Si–H and generate hydrogen, altering stoichiometry.
In solventless release coating trials, RH-H86 has been evaluated as a co-crosslinker with vinyl-functional dimethylpolysiloxane on pilot coating equipment at line speeds typically between 150 m/min and 250 m/min. The branched hydride increases cure speed sufficiently that platinum levels can be reduced by 10–30% compared with linear hydride fluids while maintaining extractable fraction below 5 wt% by solvent extraction after cure. Published data for this specific configuration is limited; pilot trials are recommended before production qualification. In non-aqueous defoamer concentrates, RH-H86 is used at 0.5–2.0 wt% as a reactive hydrophobizing component for silica particles, with final performance checked by particle size and defoaming persistence in an agitated foam test.
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