| HS Code | 493906 |
| Product Name | Methyl Terminated Hydrogen Branched Silicone Oil RH-H10 |
| Chemical Description | Methyl-terminated branched polymethylhydrosiloxane |
| Appearance | Colorless to pale yellow transparent liquid |
| Odor | Odorless or slight characteristic odor |
| Viscosity 25 C | 10-50 mPa·s (typical) |
| Hydrogen Content | 0.10 wt% (typical) |
| Density 25 C | 0.95-0.98 g/cm³ |
| Refractive Index 25 C | 1.400-1.410 |
| Flash Point | ≥100 °C |
| Volatile Content 150 C 3h | ≤2.0 wt% |
| Surface Tension 25 C | 20-25 mN/m |
| Water Solubility | Insoluble |
| Solvent Solubility | Soluble in toluene, xylene, and other organic solvents |
| Storage Temperature | 5-35 °C |
| Shelf Life | 12 months in unopened container |
As an accredited Methyl Terminated Hydrogen Branched Silicone Oil RH-H10 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-H10 is packaged in 200 kg steel drums for industrial supply and safe handling. |
| Container Loading (20′ FCL) | Methyl Terminated Hydrogen Branched Silicone Oil RH-H10 loaded in a 20′ FCL container, properly sealed, labeled, and secured for safe transport. |
| Shipping | Methyl Terminated Hydrogen Branched Silicone Oil RH-H10 is generally shipped as a non-hazardous, non-regulated material. Use sturdy, leak-proof containers; label with product name and lot number; protect from moisture, heat, and contamination. Follow local transport rules and keep the SDS with the shipment. |
| Storage | Store Methyl Terminated Hydrogen Branched Silicone Oil RH-H10 in a cool, dry, well-ventilated area away from sunlight, heat, sparks, flames, and oxidizers. Keep containers tightly closed to prevent moisture and contamination. Protect from water, acids, bases, alcohols, and amines, which may cause reaction or hydrogen evolution. Use secondary containment, clear labeling, and follow the SDS and local regulations. |
| Shelf Life | Shelf life is typically 12 months from date of manufacture when stored in the original unopened container under recommended conditions. |
Addition-cure liquid silicone rubber (LSR) formulation based on vinyl-functional polydimethylsiloxane and platinum(0) Karstedt catalyst uses RH-H10 as the hydride donor in hydrosilylation curing. Because the lot certificate for RH-H10 reports Si-H content in mmol/g and kinematic viscosity at 25 °C in mPa·s, the compounding plant must convert a target Si-H:Si-Vinyl molar ratio into a weight addition; branched architecture supplies multiple Si-H sites per molecule and thus lowers the mass addition required to reach the gel point relative to a linear methyl hydrogen siloxane of equal active hydrogen concentration. In injection-grade LSR for medical and food-contact parts, Part A contains vinyl-functional polydimethylsiloxane and the platinum catalyst, while Part B contains the same vinyl polymer and RH-H10; the components are supplied in 20 kg or 200 kg drum sets and metered at 1:1 volume through plunger-driven metering units with 12–24 static mixing stages. The mixed compound is injected into a cold-runner mold at clamp force between 100 t and 350 t, with mold wall temperature held at 120–180 °C; thin-wall sections from 0.5 mm to 1.5 mm reach demold hardness in 20–60 s. Post-curing at 200 °C for 4 h in a forced-air oven reduces cyclosiloxane extractables and residual hydrogen gas. The working formulation range for RH-H10 is 0.5–4.0 phr of vinyl-functional base polymer, with Si-H:Si-Vinyl maintained between 1.2:1 and 2.0:1; ratios below 1.1:1 produce under-crosslinking, low tensile strength, and high compression set, while ratios above 2.5:1 generate hydrogen bubbles, surface tack, and post-cure dimensional drift. Cured plaques are tested under ASTM D412-16 for tensile strength and elongation, ASTM D624-00 for tear strength, and ISO 48-4:2018 for Shore A hardness. Biocompatibility is evaluated under ISO 10993-5:2009, ISO 10993-10:2010, and ISO 10993-11:2017; food-contact status is supported by FDA 21 CFR 177.2600 and EU Regulation 10/2011 with migration testing per EN 1186-1:2002. Production-scale failure modes include moisture ingress in Part A causing rough molded surfaces, and catalyst poisoning by amine-containing mold release agents, sulfur-vulcanized rubber residues from shared injection cells, and phosphorus-containing additives. Finished part types produced by this route include baby bottle nipples, peristaltic pump tubing, respiratory mask cushions, enteral feeding teats, medical catheter cuffs, and reusable food storage lids.
| Parameter | Range or designation |
|---|---|
| Metering ratio A:B | 1:1 |
| Static mixing stages | 12–24 |
| Mold temperature | 120–180 °C |
| Thin-wall cure time | 20–60 s for 0.5–1.5 mm wall |
| Post-cure | 200 °C for 4 h |
| Si-H:Si-Vinyl | 1.2:1–2.0:1 |
| RH-H10 addition | 0.5–4.0 phr |
| Tensile test | ASTM D412-16 |
| Tear test | ASTM D624-00 |
| Hardness test | ISO 48-4:2018 |
| Biocompatibility | ISO 10993-5:2009, ISO 10993-10:2010, ISO 10993-11:2017 |
| Food-contact rubber | FDA 21 CFR 177.2600, EU 10/2011 |
In solvent-free thermal-cure silicone release coating of machine-glazed kraft, biaxially oriented polypropylene (BOPP), and polyester (PET) film liners, RH-H10 is evaluated as the hydrogen siloxane crosslinker fraction in a two-part platinum-catalyzed vinyl-functional polydimethylsiloxane system applied at coating weights between 0.5 g/m² and 1.5 g/m². RH-H10 is pre-dispersed into the vinyl polymer at 1.5–6.0 wt% of total coating solids; the Si-H:Si-Vinyl molar ratio is maintained at 1.5:1–2.5:1 to ensure rapid crosslinking and low uncured silicone transfer to the adhesive. The mixed bath is delivered to a five-roll differential-speed solventless coater with chrome-plated rollers and closed-loop gap control, where corona or plasma pretreatment is used to raise film surface energy before deposition. Oven residence time is 8–20 s at 130–180 °C; nitrogen blanketing is required when residual oxygen exceeds 1000 ppm because oxygen inhibits platinum hydrosilylation at the coating surface. Release force is measured at 180° peel angle under FINAT FTM 3, subsequent adhesion of a standard acrylic PSA tape under FINAT FTM 11, and silicone transfer by X-ray fluorescence under FINAT FTM 4. Food-contact suitability is assessed under FDA 21 CFR 175.300 for resinous and polymeric coatings, EU Regulation 1935/2004 Article 3, and EU Regulation 10/2011 with EN 1186-1:2002 overall migration testing. Paper substrates with alkaline buffering agents and high residual moisture inhibit platinum cure; addition of RH-H10 above 6.0 wt% causes brittle release surfaces and measurable silicone migration into the adhesive. Finished product types include release liners for pressure-sensitive labels, graphic film pre-mask, diaper frontal tapes, wound-care dressing liners, and silicone tape substrates.
Platinum(0) Karstedt catalyst inhibition in electronic potting gels is observed when RH-H10 is compounded with vinyl-functional polydimethylsiloxane in the presence of sulfur-containing epoxy solder masks, phthalate plasticizer remnants, or amine-cured PCB conformal coatings. For gel encapsulation of power modules, RH-H10 is incorporated into the B-side at 0.8–3.0 wt% of total A+B mass; the Si-H:Si-Vinyl molar ratio is held at 1.0:1–1.5:1 because the branched hydride contributes multiple reactive sites per molecule that can raise crosslink density beyond the targeted soft gel hardness of Shore A 10–40. Each component is vacuum-degassed at -0.095 MPa for 10 min before feeding into progressive cavity pumps or piston dispensers equipped with 8–16 static mixing stages; the mixed material is dispensed into aluminum or PBT housings under vacuum to avoid air entrapment near wire bonds. Cure is staged at 80 °C for 1 h followed by 150 °C for 2 h to control exotherm and improve adhesion to the substrate. Gel penetration is measured under ASTM D217-16, dielectric strength under IEC 60243-1:2024, and temperature cycling under IEC 60068-2-14:2009; flammability of the final module housing is evaluated under UL 94 V-0 where specified, and electrical safety under IEC 62368-1 for ICT equipment. Material compliance is documented under RoHS Directive 2011/65/EU and REACH Regulation EC 1907/2006. Incompatibility boundaries include organotin condensation-cure residues in the same dispensing cell, sulfur-containing cleaning agents, and amine-functional adhesion promoters, all of which suppress hydrosilylation. Published long-term thermal aging data for branched hydrogen siloxane gels under high-frequency power cycling is limited; accelerated testing is manufacturer-specific. Finished product types include IGBT module encapsulants, photovoltaic junction boxes, automotive ECU potting, LED driver modules, and power supply transformers.
Deposition of a crosslinked methyl hydrogen siloxane film on nylon 6,6 and polyester microfiber fabric requires alkaline pre-wash and atmospheric plasma activation prior to pad-dry-cure application. RH-H10 is emulsified as a 30 wt% active silicone emulsion and diluted to 10–40 g/L in the pad bath; the hydrogen siloxane crosslinker is dosed at 10–25 wt% of total silicone solids, with tin-based curing catalyst when the stenter frame is limited to low-temperature cure. If a platinum catalyst is selected, sulfur dyes, ammonia-based leveling agents, and residual phosphate detergents must be removed from the fabric because they poison the catalyst. The fabric is padded on a reciprocating padder at 60–80% wet pickup, dried at 100 °C for 3 min, and cured on a stenter frame at 150–170 °C for 60–120 s. Overdrying causes yellowing of nylon 6,6, while undercure results in poor wash durability after 10 launderings according to ISO 6330:2021. Water repellency is evaluated under AATCC 22-2017 spray rating, hydrostatic head under ISO 811:2018, and downproofness under EN 12132-1:1999; restricted chemical conformity is verified under OEKO-TEX Standard 100 Annex 4 and ZDHC MRSL v3.1. Fabric pH outside 4–8 or residual wax on cotton blends suppresses film formation and reduces adhesion at fiber intersections. Finished product types include performance outerwear, down jackets, tent fabrics, automotive interior textiles, upholstery, and cleanroom garments.
Foamed silicone compounds exploiting hydrogen siloxane blowing chemistry place RH-H10 in competition between the hydrosilylation crosslinking reaction and the hydrogen evolution side reaction with hydroxyl-functional silicones or controlled moisture. The gas yield and cell-size distribution are governed by the molar excess of Si-H over Si-Vinyl and the mixing temperature at the metering head. RH-H10 addition of 0.5–2.0 phr with 0.5–3.0 phr hydroxyl silicone or 0.1–0.3 phr deionized water in a platinum-catalyzed vinyl silicone base yields foam densities between 0.35 g/cm³ and 0.65 g/cm³. The Si-H:Si-Vinyl ratio is maintained between 1.0:1 and 1.8:1; excess above 2.2:1 generates uncontrolled macrovoids and surface collapse. Metering, mixing, and casting are carried out on a two-component silicone dosing system with a dynamic mixer speed of 1,500–3,000 rpm; the catalyzed compound is cast into closed aluminum molds and expansion completes within 30–90 s. Cure at 100 °C for 30 min followed by 150 °C for 1 h stabilizes the foam network. Cell structure is inspected under ISO 2896:2001, flame spread under ASTM E84, fire classification under EN 13501-1 Euroclass B-s1,d0, and heat release under ISO 5660-1:2015. Foaming is suppressed when ambient humidity exceeds 80% RH before mixing due to premature hydroxyl reaction; recovered material cannot be re-mixed because Si-H consumption shifts stoichiometry. Finished product types include firestop collars, penetration seals, battery pack compression pads, HVAC sealing gaskets, and vibration-damping pads.
Masonry capillary water absorption tests under EN 1015-18:2016 provide a direct measure of hydrophobic penetration depth for RH-H10-based water-repellent impregnations applied to concrete, clay brick, and natural stone substrates. RH-H10 is formulated in solvent-based or water-emulsion carriers at 5–15 wt% active siloxane and applied by low-pressure spray at 150–250 mL/m² to achieve 3–8 mm penetration depth in medium-porosity concrete. The substrate is cured for 28 days and cleaned by vacuum circulation or dry abrasive blasting before application; no hydrofluoric acid pre-wash is used on limestone. After hydrolysis and condensation on the mineral surface, the branched hydrogen siloxane forms a silicone resin network that reduces capillary water absorption while retaining water vapor permeability. The water absorption coefficient after treatment is compared under EN 1504-2:2004, water vapor permeability under ISO 7783:2018, and accelerated weathering under EN 1062-3:2008. Application below 5 °C or above 40 °C substrate temperature reduces penetration; for low-porosity granite published data for this specific configuration is limited and field trials are recommended. Finished product types include penetrating water repellent for concrete facades, bridge piers, brick masonry, limestone cladding, and roof tiles.
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Methyl terminated hydrogen branched silicone oil RH-H10 is supplied as a clear, colorless to faint-yellow reactive polysiloxane fluid. The polymer architecture combines a branched siloxane backbone with terminal trimethylsilyl groups, while the active Si–H functionality is located primarily on internal methylhydrosiloxane units. This molecular arrangement separates two variables that dominate hydrosilylation performance: the molar concentration of available Si–H and the number of reactive chain ends. In linear hydride-functional fluids, the highest-reactivity Si–H sites often reside at chain termini; in RH-H10 the terminal groups are methyl-capped, so premature hydrolysis and terminal crosslinking reactions are reduced.
| Parameter | Acceptance range or lot value | Test method |
|---|---|---|
| Appearance | Clear, colorless to pale yellow liquid | Visual inspection |
| Kinematic viscosity at 25 °C | 10–30 mm²/s | ASTM D445 |
| Specific gravity at 25 °C | 0.985–1.005 | ASTM D4052 |
| Refractive index nD25 | 1.400–1.410 | ASTM D1218 |
| Active Si–H content | 0.08–0.15 wt% | Iodometric titration |
| Volatile content after 3 h at 150 °C | ≤2.0 wt% | ASTM D4559 |
| Water content | ≤200 mg/kg | ASTM D6304 |
These values are acceptance windows, not performance guarantees for every downstream formulation. The active Si–H content is deliberately held in a narrow low range because the branched backbone increases the number of hydride sites per molecule; a higher bulk Si–H percentage would shift the material away from controlled addition and toward rapid gelation in platinum-catalyzed systems.
Two structural variables control the functional behavior of Si–H fluids: the position of the reactive hydride and the architecture of the siloxane backbone. In conventional linear poly(methylhydrosiloxane), the Si–H groups are distributed along a predominantly linear chain and the viscosity rises rapidly with increasing chain length because of intermolecular entanglement. RH-H10 instead uses a branched siloxane skeleton, so the average molecular weight can be increased while maintaining lower hydrodynamic volume; the result is a controlled hydride concentration without the viscosity penalty observed with linear analogues.
Terminal substitution with trimethylsilyl groups, rather than dimethylhydrosilyl groups, removes the most hydridically labile positions. In hydride-terminated fluids, terminal Si–H undergoes rapid addition and hydrolysis; by contrast, the internal Si–H sites in RH-H10 are sterically dominated by methyl substituents and exhibit a more governed addition profile. In platinum-catalyzed addition to vinyl silicones, this difference manifests as a longer induction period followed by a sharper conversion plateau, which is useful in processes requiring delayed gel formation and reduced premature crosslinking during mixing.
Compared with linear methyl-terminated polymethylhydrosiloxane, RH-H10 shows a lower dependence of viscosity on active hydrogen concentration. Compared with hydride-terminated polydimethylsiloxane, the methyl terminus reduces terminal reactivity and improves storage stability in humid atmospheres. Compared with non-reactive dimethylsilicone oils, the hydride sites provide covalent incorporation into vinyl-cured matrices, thereby reducing migration to the surface. Compared with heavily branched or Q-type Si–H resins, RH-H10 remains liquid at ambient temperature and can be pumped without dilution.
Published data for this specific configuration is limited, but comparative studies on branched polymethylhydrosiloxanes indicate that the branched structure raises the number of intramolecular Si–H sites per molecule relative to a linear fluid of equal average chain length. This intensifies crosslink density at fixed hydride-to-vinyl stoichiometry and can produce elastomers with higher hardness and lower solvent uptake when cured.
Production-scale mixing on a planetary mixer with a helical dispersing blade shows that RH-H10 wets precipitated silica more readily than an equal-viscosity linear hydride fluid; the initial amperage plateau is lower, but dispersive mixing time to a consistent Hegman reading is not shortened. This is relevant to addition-cure liquid silicone rubber compounding, where silica dispersion and hydride distribution are both rate-limiting.
Reactive Si–H fluids evolve hydrogen in the presence of alkaline water, alcohols, or strong bases. RH-H10 should be blanketed with dry nitrogen and closed after transfer. Storage above 40 °C or in direct sunlight increases the rate of headspace hydrogen accumulation. Containers should be grounded; hydrogen evolution under sealed conditions can pressurize drums. When exposed to relative humidity above 60%, pre-drying of the fluid is required before use in moisture-sensitive addition-cure systems because water reacts with Si–H at platinum or tin catalyst surfaces and consumes reactive hydride.
Stainless steel 316L or epoxy-lined carbon steel is typical for storage and transport. Copper and brass are not recommended because the fluid can mobilize trace metal residues that accelerate Si–H decomposition and reduce pot life. Avoid combination with amine-based additives, strong oxidizers, and finely divided transition metals; these materials can promote premature hydrogen release or deactivate platinum catalysts in downstream formulations.
Shelf life in unopened containers stored below 30 °C is normally limited to 12 months. After opening, active hydrogen content and moisture should be retested before use in sensitive addition-cure processes. The product’s transport classification and hazard statements should be taken from the supplier’s safety data sheet; the main handling issue is not flammability of the liquid at ambient temperature but the potential for hydrogen accumulation when contaminated with alkaline water.
Addition-cure silicone elastomers are formulated with a vinyl-functional polydimethylsiloxane, a platinum catalyst, and an Si–H crosslinker. The branched architecture of RH-H10 provides a higher crosslink density at equal active hydrogen concentration because each branch point permits a less extended network path. This is relevant in low-hardness optical encapsulants and gap fillers where high transparency and low shrinkage are required. The molar ratio of Si–H to vinyl is normally maintained between 0.8:1 and 1.5:1; ratios below 0.8:1 can yield tacky surfaces, while ratios above 1.5:1 can increase unreacted hydride and raise post-cure hydrogen release.
In hydrophobic surface treatment, RH-H10 can be applied as a dilute hydrocarbon or siloxane solution and baked at 120–160 °C for 10–30 min to bond to glass, silica, or metal surfaces. The methyl terminal groups orient outward and produce water contact angles above 95° when tested by sessile drop under ISO 19403. On aluminum panels, treatment at the lower end of the bake window may require a longer cure step to reach the same contact angle; this is a mass-transfer constraint rather than a reactivity constraint.
As a reactive diluent in solventless silicone resin systems, RH-H10 reduces dynamic viscosity without functioning only as an unreactive solvent. The hydride sites participate in hydrosilylation with vinyl resins, so the diluent is bound into the cured network. This behavior differs from non-reactive silicone diluents, which can migrate to the surface and alter adhesion or hardness. When formulating solventless release coatings, the branched fluid should be evaluated at addition levels below 15 wt% of total resin solids because higher loadings can produce an excessively dense crosslink structure and reduce film flexibility.
The fluid can be metered through gear pumps or progressive cavity pumps without preheating. In continuous addition-cure mixing lines, the lower viscosity and delayed gel profile allow a wider processing window than linear hydride fluids of comparable Si–H content. This is advantageous in static mixer dispensing systems where shear heating is limited and gelation must be avoided before the fluid reaches the substrate.
In textile finishing, pad-cure application at 150–170 °C produces a hydrophobic surface and soft handle. Because the silicone is hydride-functional, it can be deposited from solvent or aqueous emulsion; the emulsion must be stabilized with nonionic surfactants and used within a controlled pH range of 5–7 to avoid premature Si–H hydrolysis.
In LED encapsulant formulations, hydride-to-vinyl stoichiometry and cure schedule affect thermal stability and optical clarity at 120 °C continuous operating temperature. The branched architecture permits effective gel formation at lower hydride loadings, which can reduce the concentration of unreacted Si–H. Unreacted Si–H is a potential contributor to oxidative discoloration and hydrogen evolution under thermal aging. Formulators should measure residual Si–H after cure by attenuated total reflectance infrared spectroscopy or by iodometric titration of the cured slab; published data for this specific branched methyl-terminated fluid is limited.
Regulatory acceptance is application-specific. For food-contact uses, the user must confirm compliance under the appropriate regional positive list; RH-H10 is not automatically cleared under 21 CFR 175.300. Industrial handling should be governed by the safety data sheet and by local VOC regulations where solvent-borne treatment is used. Batch-to-batch active hydrogen content can vary within the specified window, so addition-cure formulators should verify Si–H:vinyl stoichiometry by iodometric titration for each lot before scaling from laboratory mixing to production runs.
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