| HS Code | 456507 |
| Productname | Silicone Elastomers RH-SEB-6061 |
| Materialtype | Silicone Elastomer |
| Color | White |
| Volumeresistivity Ohm Cm | 1e14 |
| Flamerating | UL94 HB |
As an accredited Silicone Elastomers RH-SEB-6061 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Silicone Elastomers RH-SEB-6061 is supplied in 25 kg sealed, moisture-resistant industrial drums for safe storage and transport. |
| Container Loading (20′ FCL) | Silicone Elastomers RH-SEB-6061 loaded in a 20′ FCL container, palletized, shrink-wrapped, secured, labeled, with MSDS, ready for ocean shipment. |
| Shipping | Silicone Elastomers RH-SEB-6061 is shipped in sealed, properly labeled containers compatible with silicone materials, protected from moisture, contamination, and extreme temperatures. It is generally non-hazardous for transport unless local regulations state otherwise. Shipping documents should include product name, batch number, quantity, and safety data sheet. |
| Storage | Store Silicone Elastomers RH-SEB-6061 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition hazards. Keep containers tightly closed when not in use to prevent contamination and moisture ingress. Protect from freezing or excessive temperatures as per supplier guidance. Maintain clear labeling, segregate from incompatible materials, and follow the product SDS and local regulations. |
| Shelf Life | Typical shelf life is 12 months from manufacture when stored unopened in a cool, dry place, protected from heat, moisture, and contaminants. |
Injection-moulded ventilation mask cushions produced from Silicone Elastomers RH-SEB-6061 are typically manufactured in an ISO Class 7 cleanroom using a liquid silicone rubber dosing unit equipped with a static mixer and cold-runner tooling. The base is metered at 100 parts and combined with 0.8–1.2 phr methylhydrogensiloxane crosslinker and 5–15 ppm platinum catalyst; catalyst addition below 5 ppm causes cure dwell drift across multi-cavity tools, while addition above 15 ppm raises the extractable platinum residue burden that must be validated under ISO 10993-18 chemical characterisation. Cured articles require qualification to ISO 10993-5:2009 for cytotoxicity, ISO 10993-23:2021 for irritation, USP <88> Class VI, FDA 21 CFR 177.2600 where food or oral contact is intended, and EU MDR 2017/745 for regulatory documentation. The downstream process is liquid injection moulding at 120–160°C and 50–100 bar injection pressure, followed by post-cure in circulating air at 200°C for 4 h; production-scale failure modes include back-rind formation when cavity temperatures vary by more than ±5°C and air entrapment when the static mixer is run above 30 bar line pressure. Terminal finished product types include ventilator mask cushions, CPAP mask cushions, breathing circuit gaskets, and syringe plunger tips; platinum catalyst inhibition from latex contact surfaces, amine-containing mould release agents, and sulfur-vulcanized elastomer storage areas must be excluded from the production line.
Under sustained underhood temperatures above 150°C, RH-SEB-6061 turbocharger hose compounds are formulated with peroxide cure rather than platinum because sulfur-containing oil mist and amine-containing rubber additives poison platinum catalysts at the moulded part interface. The base is charged at 100 phr in an internal mixer with 0.6–1.0 phr 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 15–30 phr fumed silica, and 5–15 phr cerium oxide heat stabilizer; published data for RH-SEB-6061 in this exact configuration is limited, but representative high-consistency silicone elastomer compounds of this class are dumped at 30–60°C and then extruded through a cold-feed screw at 20–40 rpm. Continuous vulcanization in steam or hot air is operated with residence times of 3–7 min, after which post-cure at 200°C for 4 h removes acidic peroxide by-products and stabilises compression set. Compliance is verified to ASTM D395-18 Method B for compression set, ASTM D412-16 for tensile properties, ASTM D2240-15 for durometer hardness, and ISO 188:2011 for heat ageing at 175°C for 168 h; OEM prints commonly reference SAE J200 or ASTM D2000 M2 GE 505. Terminal finished product types include turbocharger hoses, intercooler sleeves, EGR seals, and underhood gaskets. The critical processing boundary is scorch control: screw temperatures above 50°C during mixing can initiate peroxide decomposition, and any addition of sulfur-vulcanized rubber scrap must be prevented to avoid cure-state heterogeneity.
Because EU 10/2011 migration thresholds penalise organic peroxide residues more heavily than platinum-complex residues, food-contact bakery mats and oven seals produced from RH-SEB-6061 often shift to a platinum-cured system despite higher raw-material cost. A typical food-contact compound is milled at 100 phr RH-SEB-6061 with 0.7–1.2 phr methylhydrogensiloxane crosslinker, 5–10 ppm platinum catalyst, 0.5–1.0 phr hydrogenated castor oil as internal release agent, and 3–6 phr fumed silica; addition of fumed silica above 6 phr without a coupling agent increases mill crumb and can create porosity during compression moulding. The downstream process uses a two-roll mill at 20–30°C, followed by hot-air tunnel cure at 180–200°C for 3–5 min or compression moulding at 50–100 bar; continuous oven seals are subsequently post-cured at 200°C for 4 h to remove low-molecular-weight siloxanes that would otherwise migrate into fatty food simulants. Compliance is established against FDA 21 CFR 177.2600, EU 10/2011 Annex I and Annex III, LFGB §30/31, BfR Recommendation XV, and EN 1186-1 migration testing. Terminal finished product types include baking mats, chocolate moulds, oven seals, food dispensing tubing, and reusable storage gaskets. The operational limitation is moisture: mill roll condensation at relative humidity above 60% can introduce micro-porosity, so silica and RH-SEB-6061 storage areas require climate control before compounding.
| Jurisdiction | Standard / method | Test condition | Limit / criterion |
|---|---|---|---|
| United States | FDA 21 CFR 177.2600 | Extraction cell for rubber articles intended for repeated food contact | Conforms to extractive profile applicable to silicone rubber |
| European Union | EU 10/2011 Annex I and Annex III | Overall migration in food simulant | 10 mg/dm² overall migration |
| Germany | LFGB §30/31 / BfR Recommendation XV | Sensory and extractables for silicone | No adverse sensory taint; volatile siloxane below BfR limits |
When RH-SEB-6061 is used as the base elastomer for high-temperature wire insulation, the addition of 20–40 phr aluminum hydroxide and 10–20 phr zinc borate raises the limiting oxygen index but also increases Mooney viscosity, forcing a reduction in line speed unless the twin-screw extruder is configured with an L/D ratio of 25:1. The base is loaded at 100 phr, followed by 1.0–1.5 phr dicumyl peroxide; filler batches above 40 phr aluminum hydroxide often require a two-pass mixing sequence to avoid scorch at screw temperatures above 50°C. On a wire coating line, the compound is extruded at 15–30 m/min and continuously vulcanized in steam at 200–220°C; the resulting jacket is tested for tensile elongation, heat resistance, and flame retardancy. Compliance is verified to UL 758, UL 1581 VW-1, IEC 60245-1:2008, EN 50363-1:2018, RoHS 2011/65/EU, and REACH 1907/2006. Terminal finished product types include electric vehicle high-voltage cable jackets, appliance internal wiring, high-temperature lead wire, and industrial control cable sheathing. The key operational boundary is filler moisture: un-dried aluminum hydroxide at relative humidity above 60% generates steam during extrusion and can create jacket voids, while platinum-cured variants must be excluded from lines where tin-catalyzed compounds have previously run without full purging.
Before dispensing RH-SEB-6061 into a connector housing or potting cavity, the substrate must be verified for platinum catalyst inhibitors; tin-catalyzed RTV residues, sulfur-containing adhesives, and amine-based conformal coatings can prevent cure at the part–elastomer interface. For electronics potting and connector sealing, the base is mixed at 100 phr with 0.5–1.0 phr methylhydrogensiloxane crosslinker and 5–10 ppm platinum catalyst, then degassed in a vacuum chamber at –0.09 MPa for 3–5 min; a two-step cure of 80°C for 30 min followed by 120°C for 60 min reduces void formation and improves connector seal retention. Compliance for flame resistance is verified to UL 94 V-0; filled thermal-interface grades are tested to ASTM D5470-17 for thermal conductivity, low-outgassing versions to ASTM E595-15 with total mass loss below 1.0% and collected volatile condensable material below 0.1%, and conformal coating variants to IPC-CC-830B. Terminal finished product types include automotive connector seals, ECU potting compounds, sensor gaskets, optoelectronic encapsulation, and conformal coating dams. The operational limitation is cure inhibition: solvent cleaning with isopropanol is required before dispensing, and any peroxide-cured RH-SEB-6061 compound must not be used in this segment because acidic by-products can corrode copper-wire bonds and lead frames.
Because volatile siloxane migration in infant feeding teats is governed by post-cure completeness, RH-SEB-6061 compounds used in this segment are post-cured at 200°C for 4 h after initial moulding; headspace GC-MS screening of the cured article is used to confirm that low-molecular-weight siloxane content remains below the purchaser limit for repeated oral contact. The material is injection-compression moulded at 100 parts RH-SEB-6061 with 0.6–1.2 phr platinum-cure crosslinker and 3–5 ppm platinum catalyst, using a clamp force of 150–250 tonnes on multi-cavity cold-runner tooling. Compliance is established to EN 14350:2020 for feeding teats, EN 1400:2013 for pacifiers, BfR Recommendation XV, FDA 21 CFR 177.2600, and USP <88> Class VI. Terminal finished product types include feeding teats, pacifier bags, teething rings, and reusable personal-care articles; the limiting operational boundary is avoidance of post-cure temperatures above 220°C, which discolours thin-section moulded parts and can alter shore hardness distribution across the multi-cavity tool.
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RH-SEB-6061 is a two-part platinum-catalyzed addition-cure high-consistency silicone elastomer formulated with vinyl-functional polydimethylsiloxane, treated fumed silica reinforcement, and a methylhydrogenpolysiloxane crosslinker. The catalyst component contains a platinum-divinyltetramethyldisiloxane complex and an inhibitor package that extends mixed pot life. The material is supplied as a millable base and a low-viscosity catalyst paste at a volumetric mix ratio of 1.00:1.00. The grade is intended for extrusion, transfer molding, and injection molding of sealing profiles, gaskets, O-rings, tubing, and molded components that require low volatile content and no peroxide decomposition residues. Published independent performance data for this exact grade are limited; numerical values cited below are taken from the manufacturer’s technical data sheet and from analogous addition-cure high-consistency elastomer systems, and should be verified against the batch certificate.
The addition-cure mechanism proceeds by hydrosilylation between terminal vinyl groups on the base polymer and silicon-hydride functionality on the crosslinker. The reaction generates no condensation by-products. Cure rate is strongly temperature-dependent. Moving-die rheometer data according to ISO 6502 indicate a T90 of 8 min at 120°C, 3 min at 150°C, and 1.5 min at 170°C for a 2 mm specimen. The mixed compound remains usable at 25°C for 72 h, but pot life decreases to approximately 8 h at 40°C because the inhibitor is consumed by thermal activation. The cure system is inhibited by amines, organotin compounds, sulfur-containing additives, and strong electron donors; contact with these materials reduces or eliminates crosslinking. The inhibitor package is thermally labile; once the compound reaches 80°C, the rate of inhibitor consumption exceeds diffusive replenishment, and hydrosilylation accelerates. The use of a two-roll mill without differential speed control can reduce scorch time by 20–30% because shear heating dominates. Similar shear heating effects are known from published studies of addition-cure silicone gums; direct transfer to this grade should be confirmed separately.
| Property | Test method | Value |
|---|---|---|
| Mixed ratio by volume | Vendor batch certificate | 1.00:1.00 |
| Mooney viscosity ML(1+4) 100°C | ASTM D1646 | 55–65 MU |
| Shore A hardness | ASTM D2240 | 60±5 |
| Tensile strength | ASTM D412 Die C | 7.5–9.0 MPa |
| Elongation at break | ASTM D412 Die C | 300–450% |
| Tear strength | ASTM D624 Die B | 18–24 kN/m |
| Specific gravity | ASTM D792 | 1.16–1.20 g/cm³ |
| Compression set 22 h/175°C | ASTM D395 Method B | 12–20% |
| Linear shrinkage after post-cure | Vendor internal method | 2.5–3.2% |
Mixing of Part A and Part B on a two-roll mill should be conducted with a friction ratio of 1.15:1 to 1.25:1 and a roll surface temperature below 60°C. The mixed compound remains processable at 25°C for 72 h. In a 25 mm twin-screw extruder with an L/D ratio of 25:1, barrel zones are set from 20°C to 45°C; screw speed between 30 rpm and 80 rpm is typical. A screw with low-shear barrier flight design is preferred. High-shear sections can generate local temperatures above 70°C, resulting in scorch, particularly at the screw root. Production lines have recorded scorch at the screw root when the extruder is stopped for more than 15 min with barrel temperature above 50°C; purging with a low-viscosity silicone oil is required before shutdown. Mooney scorch at 121°C according to ASTM D1646 is 10–15 min, which defines the safe residence time in a heated injection barrel. Batch-to-batch variation in fumed silica dispersion is monitored by Mooney viscosity and by optical surface roughness after calendering. A variation greater than ±5 Mooney units from the certificate value indicates incomplete wetting of the silica and predicts higher die swell and lower tensile strength after cure.
Replacement of a peroxide-cured high-consistency rubber with RH-SEB-6061 in a sealing profile requires adjustment of the cure oven zone temperatures. Peroxide-cured compounds typically require temperatures of 200°C to 250°C and generate acetophenone or dicumyl peroxide decomposition products. RH-SEB-6061 cures at lower temperatures and releases no acidic or peroxide decomposition by-products. However, contact with amine-containing hot-air oven surfaces, sulfur-accelerated rubber dust, or tin-catalyzed condensation silicone residues inhibits hydrosilylation. Dedicated mixing tools, non-reactive release liners, and separate storage for platinum-catalyzed and tin- or sulfur-containing compounds are mandatory. Compared with liquid silicone rubber, RH-SEB-6061 has higher green strength and can be extruded as a free-standing profile without a support mat. Liquid addition-cure systems have lower viscosity and are better suited to automatic dispensing and overmolding, but they require static mixers and pumping systems. The high-consistency form reduces slump in vertical profiles and allows calendering into unsupported sheet.
In addition-cure elastomers, post-curing accelerates the addition of residual Si-H groups and reduces extractable siloxane content. The manufacturer recommends 4 h at 200°C in a ventilated oven for food-contact or medical components. Post-cure also stabilizes compression set. In contrast, peroxide-cured compounds may retain crystalline peroxide decomposition residues that bloom to the surface and require additional extraction. The lower cure temperature of RH-SEB-6061 reduces energy input in hot-air continuous vulcanization, but line speed is constrained by cure state measured as moving-die rheometer T90 rather than by extrusion output. Continuous vulcanization under atmospheric hot air requires the extrudate to be supported to avoid deformation before the crosslink density reaches the gel point. The use of a salt-bath or radiant infrared cure after atmospheric hot air improves roundness and reduces surface tack. The following table summarizes comparative data for the three product classes.
| Parameter | RH-SEB-6061 | Peroxide-cured HCR | Condensation-cure RTV |
|---|---|---|---|
| Cure system | Platinum addition | Organic peroxide | Tin or alkoxy condensation |
| Main cure by-product | None | Acetophenone or aromatic alcohols | Alcohol or acetic acid |
| Post-cure required for low volatiles | 4 h at 200°C | Often 4 h at 200°C; may not reduce all residues | Not applicable |
| Catalyst sensitivity | High to amines, sulfur, organotin | Low | Moisture-sensitive cure |
| Compression set 22 h/175°C | 12–20% | 25–45% | 30–50% |
In a 120-ton injection molding press with a cold-runner system held at 40°C and a multi-cavity mold at 165°C, the material has been processed using screw plastication with a barrel profile of 25°C to 45°C and back pressure below 2 MPa. Premature cure in the screw check ring is avoided by limiting residence time to less than 10 min at barrel temperature. Batches stored at 25°C in sealed drums show less than ±5% variation in Mooney viscosity ML(1+4) 100°C after 3 min of mastication. Extrudate surface roughness has been observed when moisture uptake exceeds 0.1%; pre-drying is therefore required at relative humidity above 60% or after exposure to uncontrolled ambient air for more than 24 h. The grade is used for transferred molded O-rings, electrical connector seals, and food-contact tubing where low extractables and no peroxide residues are specified. The cure system’s sensitivity to sulfur-containing elastomer dust requires separate storage and tooling from organic rubber production cells.
Vendor documentation states that RH-SEB-6061 compounded in a clean environment and post-cured for 4 h at 200°C meets the extractables requirements of FDA 21 CFR 177.2600 for repeated-use rubber articles. Selected lots have been tested according to ISO 10993-5 and ISO 10993-10; however, end-product biocompatibility must be validated for each sterilization modality and surface finish. Steam autoclave at 121°C for 30 min is generally tolerated; repeated gamma irradiation above 25 kGy can produce crosslink density changes that increase hardness by 2–5 Shore A points. The product is not recommended for direct contact with strong acids above 50°C, concentrated ketones, or esters due to swelling and network degradation. Use with amine-based epoxy adhesives, sulfur-vulcanized rubber contact surfaces, and organotin-catalyzed silicone residues is contraindicated. Compliance documentation is provided by the vendor in the form of batch certificates; independent testing to REACH EC 1907/2006 and RoHS 2011/65/EU is limited to the supplier’s declaration unless a third-party audit is performed.
Extrusion of a 12 mm outer diameter tubing with 2 mm wall thickness has been run at line speeds of 8–15 m/min using a 45 mm extruder and a hot-air tunnel set at 180°C for 6 min. The limiting factor is the cure state at the tunnel exit, which must exceed 90% of T90 to prevent post-extrusion deformation. Lower line speeds are required for profile thicknesses above 4 mm because the thermal conductivity of the silicone compound is approximately 0.2 W/(m·K) and heat transfer limits the central cure. For automotive charge-air cooler seals operating at 180°C continuous with excursions to 200°C, hot-air aging at 200°C for 72 h according to ASTM D573 shows hardness change of +3 to +5 Shore A points and tensile retention above 70%. Published data for this specific component geometry is limited; seal retention force and compression set should be evaluated under the actual flange load.
Transfer molding of undercut grommets with 0.5 mm cross-section and 25 mm diameter has been performed with mold closure force of 400 kN. The compound fills thin sections without porosity when the mold is evacuated to −0.08 MPa before injection and held under pressure for 20 s. Published data for this specific configuration is limited; mold trials should establish shot weight, cavity pressure decay, and demolding force for the particular part geometry.
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