| HS Code | 856717 |
| Appearance | Translucent |
| Density | 1.15 g/cm³ |
| Hardness | 60 Shore A |
| Tensilestrength | ≥7.0 MPa |
| Elongationatbreak | ≥350% |
| Tearstrength | ≥25 kN/m |
| Compressionset | ≤20% (100°C × 24 h) |
| Reboundresilience | ≥50% |
| Volumeresistivity | ≥1×10^14 Ω·cm |
| Dielectricstrength | ≥20 kV/mm |
| Dielectricconstant | 3.0 at 1 MHz |
| Operatingtemperaturerange | -60°C to 200°C |
As an accredited Silicone Elastomers RH-SEB-8060 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Silicone Elastomers RH-SEB-8060 is supplied in 25 kg sealed, moisture-resistant industrial drums for safe storage and transport. |
| Container Loading (20′ FCL) | Silicone Elastomers RH-SEB-8060 are securely palletized and loaded into a sealed 20-foot FCL container for export shipment. |
| Shipping | Ship Silicone Elastomers RH-SEB-8060 in original sealed containers, protected from moisture, heat, and contamination. Use standard freight with proper labels and documentation. Handle and store per the SDS and applicable transport regulations in a cool, dry, ventilated area. |
| Storage | Store Silicone Elastomers RH-SEB-8060 in a cool, dry, well-ventilated area away from direct sunlight, heat, ignition sources, moisture, and contaminants. Keep containers tightly closed and retain original labels. Avoid extreme temperatures and oxidizers. Maintain recommended shelf-life conditions, use oldest stock first, and follow the manufacturer’s safety data sheet and local regulations. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored unopened in original containers at 5–25°C, away from sunlight and moisture. |
Process qualification for RH-SEB-8060 begins with a millable high-consistency silicone elastomer based on methyl-vinyl polysiloxane and fumed silica reinforcement. Downstream application boundaries are set by cure chemistry, post-cure extraction behaviour, and migration characteristics of low-molecular-weight siloxanes. The following zones are separated by distinct regulatory frameworks, processing equipment, and failure modes rather than by generic material properties.
Short-term patient-contact components produced from RH-SEB-8060 typically enter production as compression-molded or transfer-molded preforms in an ISO Class 7 cavity area. The material is milled on a two-roll mill at 25–40 °C with a friction ratio of 1.1:1–1.4:1 to disperse either a platinum catalyst masterbatch at 0.1–0.2 phr or a peroxide such as bis(2,4-dichlorobenzoyl) peroxide at 0.8–1.2 phr. Cure cycles on chrome-plated tooling are set between 165–180 °C for 4–10 min depending on section thickness, with first-off cavity thermocouple mapping used to confirm that the slowest cavity reaches T90. In peroxide-cured lots, post-cure is performed in a forced-air oven at 200 °C for 4 h with 10 air changes per hour and stainless-steel tray loading below 5 kg/m²; this step reduces volatile cyclic siloxane content to below 0.5% by weight as measured by headspace GC-MS under ISO 10993-18. Biocompatibility evaluation follows ISO 10993-5 for cytotoxicity, ISO 10993-10 for sensitization and irritation, and USP <88> Class VI for plastics; platinum-cured compositions generally show lower extractable residues, but peroxide-cured stock requires extraction with water for injection at 121 °C for 1 h before release. Finished components include respiratory mask cushions, wound drainage tubing connectors, short-term enteral feeding seals, and diagnostic instrument gaskets. Operational boundaries exclude long-term implant or permanent tissue contact without an ISO 14971 risk file, and repeated steam sterilization at 134 °C may shift oligomer migration; each sterilant and cycle count therefore requires lot-specific validation.
Automotive thermal-management sealing lines that run RH-SEB-8060 in turbocharger and exhaust-gas-recirculation joint profiles face a narrow processing window where cure speed and scorch resistance must be balanced. Stock is fed to a cold-feed vacuum extruder with screw diameter 60–90 mm, L/D 16:1–20:1, compression ratio 2.5:1, barrel temperature 25–40 °C, and head temperature 60–80 °C; die swell is controlled with a haul-off ratio of 1.05–1.15. Continuous vulcanization is carried out in a hot-air tunnel at 250 °C for 1–3 min or in a salt bath at 220 °C for 1–2 min, followed by a 4 h post-cure at 200 °C when peroxide-cured formulations are used. Formulation additions on a 100 phr polymer basis typically include 0.8–1.2 phr of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 20–30 phr treated fumed silica, and 0.3–0.5 phr iron oxide heat stabilizer. Finished sealing parts are specified against ASTM D2000 M 6GE 607 with supplementary requirements under ISO 188 after 70 h at 225 °C: tensile change within ±25% and elongation change within ±30%. Compression set is evaluated under ASTM D395 Method B after 22 h at 175 °C with a maximum accepted value of 25%. Production-scale failure modes on 250-ton injection moulding machines include premature scorch in cold runners when residence time exceeds 15 min at 80 °C; cold-runner temperature is therefore held at 50–60 °C and inventory turnover is kept below 10 shots. Typical terminal components are charge-air cooler gaskets, EGR valve diaphragms, thermostat housing seals, and coolant manifold gaskets. This grade is not recommended for continuous immersion in engine oil, transmission fluid, biodiesel, or gasoline; volume swell in ASTM D471 IRM 901 oil can exceed 20%, and fluorosilicone or FKM must be selected where fuel/oil contact is continuous.
Food-contact processing of RH-SEB-8060 is governed by the need to keep total migration below the EU food-contact limit of 10 mg/dm² under EN 1186-1 and to meet FDA 21 CFR 177.2600 extraction constraints. Injection moulding is performed with a cold-runner tool, screw L/D 18:1, barrel temperature 40–60 °C, injection pressure 80–120 MPa, and mould temperature 170–190 °C. Peroxide-cured food-contact stocks are compounded with bis(2,4-dichlorobenzoyl) peroxide at 0.8–1.2 phr and post-cured at 200 °C for 4 h; platinum-catalysed variants use catalyst masterbatch at 0.1–0.2 phr and may be post-cured for 2 h to stabilise compression set. The post-cure step is not a surface treatment but a bulk devolatilisation stage: parts pulled before 3 h frequently retain 2,4-dichlorobenzoic acid residues detectable by GC-MS above 0.2 mg/kg, while after 4 h forced-air post-cure the same residues fall below a detection threshold of 0.01 mg/kg. Compliance documentation includes BfR Recommendation XV and LFGB for German market release, EU 1935/2004 for food-contact materials, and EN 1186-1 migration testing. Finished goods processed from RH-SEB-8060 in this zone include oven door gaskets, coffee machine seals, milk transfer tubing, food dispensing valve bodies, and bakeware mat inserts. Application limits include avoidance of unplated brass inserts because metal ions can catalyse decomposition, and exclusion of continuous service with strong acidic food concentrates at temperatures above 150 °C without migration revalidation.
| Application zone | Regulatory/standard framework | Boundary condition | Process control checkpoint |
|---|---|---|---|
| Medical short-term contact | ISO 10993-5, ISO 10993-10, USP <88> | Residual volatiles <0.5% by weight | Forced-air post-cure at 200 °C for 4 h |
| Food contact | FDA 21 CFR 177.2600, EN 1186-1, BfR XV | Total migration <10 mg/dm² | Peroxide residue <0.01 mg/kg after 4 h post-cure |
| Infant feeding articles | EN 14350, FDA 21 CFR 177.2600, ASTM D624 | Tear strength ≥35 kN/m | Mould vacuum <50 mbar, post-cure 200 °C for 4 h |
| Automotive thermal sealing | ASTM D2000 M 6GE 607, ISO 188, ASTM D395 | Compression set ≤25% after 22 h at 175 °C | Cold-runner residence <15 min at 80 °C |
| Electrical insulation | IEC 60243-1, ASTM D257, IEC 60112, UL 94 V-0 | Dielectric strength ≥20 kV/mm; volume resistivity ≥1×1014 Ω·cm | Post-cure for peroxide removal; copper staining check |
| Biopharmaceutical sealing | USP <665>/<1665>, ASME BPE, ISO 10993-18 | Non-volatile residue <3 mg/g; pH shift <1.0 | WFI extraction; lot-specific release |
In high-voltage connector and cable accessory production, RH-SEB-8060 is evaluated against dielectric loss and tracking behaviour rather than tensile properties alone. Extrusion onto cable cores or into preformed sleeves uses a 20:1 L/D screw with temperature profile 60–120 °C across four zones, head pressure 8–15 MPa, and a pressure die geometry; continuous vulcanization in a steam or hot-air tunnel is followed by a post-cure step at 200 °C for 4 h to remove peroxide by-products that would otherwise corrode copper conductors. Electrical compliance is anchored to IEC 60243-1 for dielectric strength with a typical pass band not below 20 kV/mm on 2 mm plaques, ASTM D257 for volume resistivity at or above 1×1014 Ω·cm, IEC 60112 for comparative tracking index above 600 V, and UL 94 V-0 for flame classification when hydrated alumina is dispersed at 40–60 phr. The high filler loading reduces die swell during extrusion, and the haul-off ratio is adjusted to 1.05–1.10 to prevent cross-sectional asymmetry. Finished articles include cable termination boots, high-voltage insulator sleeves, bushing covers, and surge arrester housings. Operational limits include incompatibility with plasticised PVC cable jackets because phthalate migration can plasticise the silicone surface and alter tracking resistance; direct contact with sulfur-cured EPDM or natural rubber is also avoided unless a barrier layer is present.
Thin-section mould design for infant feeding articles requires RH-SEB-8060 to be processed with vacuum-assisted injection moulding because air entrapment at knit lines creates tear-initiation sites that do not appear in standard tensile data. Machines with 120–180 ton clamp force and screw L/D 14:1 are used, with mould vacuum held below 50 mbar and vent gaps ground to 0.01–0.02 mm. The compound is adjusted with vinyl-rich gum at 10–20 phr, platinum catalyst masterbatch at 0.1–0.2 phr, and treated fumed silica at 15–25 phr to obtain a hardness of 45–55 Shore A. Tear strength is tested under ASTM D624 Die C with a minimum acceptance value of 35 kN/m; tensile strength is verified under ASTM D412 at a minimum of 7 MPa, and elongation at break is not accepted below 300%. After demoulding, parts are post-cured at 200 °C for 4 h to remove volatile siloxanes and stabilise compression set. The terminal products are pacifier nipples, bottle nipples, breast pump valves, and teething rings. The governing compliance set includes EN 14350 for child-use drinking equipment, FDA 21 CFR 177.2600 for rubber articles, and EN 1186-1 for migration. A process boundary is set by flash thickness: knife-edge flash below 0.05 mm can generate particulate tear debris during use, so flash trim is replaced by polished blocking lands where possible.
Dynamically loaded valve diaphragms produced from RH-SEB-8060 are subject to flex-fatigue failure modes that standard tensile data do not capture. Calendering is performed on a two-roll mill at 40–50 °C, with sheet thickness controlled between 0.5 mm and 2.0 mm; blanked preforms are compression moulded at 170 °C under 10 MPa hydraulic pressure, followed by a 200 °C post-cure for 4 h. Formulation for 65–75 Shore A industrial diaphragms includes fumed silica at 30–50 phr, bis(2,4-dichlorobenzoyl) peroxide at 0.8–1.2 phr, and internal mould release at 0.2–0.5 phr. Tear strength is measured under ISO 34-1 Method B with a minimum value of 30 kN/m; crack growth resistance is screened under ASTM D813 for DeMattia flex fatigue, although published data for this specific configuration is limited and field qualification relies on coupon testing in the actual pressure cycle. Finished components include pneumatic diaphragm valve seals, check valve seats, sanitary pump diaphragms, and expansion joint membranes. Chemical compatibility boundaries are severe: RH-SEB-8060 is not suitable for continuous exposure to aromatic hydrocarbons, ketones, esters, chlorinated solvents, or mineral oil; fluorosilicone, FKM, or FFKM is required when the process fluid is not aqueous or steam-based.
Biopharmaceutical sealing applications subject RH-SEB-8060 to simultaneous thermal, hydrolytic, and extractable demands that require lot-specific qualification rather than material-type certification. Compression moulding is carried out in an ISO Class 7 cleanroom, with preforms cut on a clean two-roll mill and cured at 170–180 °C for 4–8 min; post-cure is performed at 200 °C for 4 h under -0.08 MPa vacuum to reduce volatiles. Platinum-catalysed formulations with catalyst masterbatch at 0.1–0.2 phr are preferred because peroxide cure leaves acidic by-products that can shift WFI pH. The release protocol includes USP <665>/<1665> extractable screening in water for injection and 50% ethanol/water, with acceptance boundaries commonly set at non-volatile residue below 3 mg/g, pH shift below 1.0, and UV absorbance below 0.2 AU at 210 nm. Sanitary equipment compliance is aligned with ASME BPE surface finish and material documentation requirements, and the final parts are washed with water for injection and steam autoclaved at 121 °C for 2 h before packaging. Terminal products include sanitary ferrule gaskets, filter housing seals, diaphragm valve membranes, and CIP/SIP system seals. Operational boundaries exclude clean steam exposure below pH 4.5 at 135 °C because acidic hydrolysis attacks the siloxane backbone, and concentrated sodium hydroxide above 1 M at process temperature should be validated separately. Published multi-batch extractable data for this exact grade in continuous steam service is limited; therefore each production lot is screened before release and the surface-to-volume ratio of the end-use assembly is documented in the batch record.
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Silicone Elastomers RH-SEB-8060 is specified as a two-part, platinum-catalyzed addition-cure liquid silicone rubber for closed-loop meter-mix dispensing and liquid silicone rubber injection molding. The grade targets a nominal cured hardness of 60 Shore A when tested to ASTM D2240-15e1. Crosslinking proceeds through platinum-catalyzed hydrosilylation between vinyl-functional polydimethylsiloxane chains and silicon-hydride-functional crosslinkers. No methanol, acetic acid, oxime, or ammonia is released during cure, which reduces mold fouling and permits use in closed cavities. The two components are mixed at a 1:1 ratio by weight in static mixing equipment with 12–24 elements. Because the manufacturer has not published a freely accessible product-specific datasheet under the RH-SEB-8060 designation, the numerical property data in this document are representative engineering values for a 60 Shore A addition-cure liquid silicone rubber and must be confirmed against the lot certificate of analysis.
The hydrosilylation cure of RH-SEB-8060 proceeds by a reaction that has an apparent activation energy generally reported for this class of 70–90 kJ/mol. A practical consequence is that cure time is roughly halved for every 10 °C increase in mold temperature between 110 °C and 150 °C. Mixed viscosity at 25 °C is specified in the 50,000–80,000 mPa·s band under ISO 3219. Pot life at 25 °C is 60–120 min, measured as time to double initial viscosity. Cure at 120 °C reaches 90% of maximum moving die rheometer torque in 10 min under ISO 6502. Linear shrinkage is below 0.5%. The absence of condensation by-products improves dimensional stability, but trapped air from static mixing can form microvoids if injection back pressure is not sustained above 5 MPa. Catalyst inhibition occurs with amines, sulfur-containing compounds, organotin species, and nitrile rubber residues. Shared tooling must be cleaned with aliphatic solvents. In environments above 60% relative humidity, predrying of substrates or the silicone surface is required before bonding to prevent water-mediated inhibition at the interface.
On a reciprocating-screw liquid silicone injection molding machine with a 20:1 L/D ratio and a 25–30 mm screw diameter, barrel temperature is maintained at 20–30 °C to prevent premature gelation. The mold cavity is held at 120–180 °C depending on part mass and wall thickness. For multi-cavity tools producing seals with part mass between 5 g and 30 g, clamp force is usually set from 80 metric tons to 200 metric tons based on projected area and mold breathing. The static mixer is retained at 20–30 °C. Mixer element count below 12 produces insufficient striation mixing and yields hardness variation greater than ±5 Shore A across the shot. Metering ratio error beyond ±2% shifts the stoichiometric balance and reduces tensile strength by more than 15% in production trials. Venting channels of 0.01–0.03 mm depth are required at weld-line positions. Injection speed below 10 mm/s leads to premature skin cure at the cavity wall and knit-line failure. Barrels and check rings should be purged if residence time exceeds 10 min at processing temperature. Cold-runner channels are typically maintained at 20–30 °C with gate diameters of 0.5–1.5 mm; runner diameters from 2–4 mm are used for balanced filling. These parameters are derived from standard liquid silicone rubber processing practice and must be refined by mold flow simulation and first-article qualification on the specific manufacturing line.
Rheological behavior is shear-thinning. At 10 s-1, mixed viscosity is near the upper specified limit; at 100 s-1, viscosity may fall by 30–50% depending on filler networking. This property governs flow into thin-wall sections of 0.2–0.5 mm. Loss of shear recovery after passing through the static mixer produces flow marks if cavity temperature is below 110 °C. Cavity pressure sensors and pressure-volume-temperature measurements are used to set holding pressure; insufficient holding pressure allows backflow and sink marks. In production, holding pressure of 20–40 MPa is typically applied until gate freeze. Short-shot studies transfer these values to the mold.
The following table summarizes representative properties for a 60 Shore A addition-cure liquid silicone rubber of the RH-SEB-8060 class. Values are not a certificate of analysis and must be verified for each production lot.
| Property | Test Method | Nominal Value / Range |
|---|---|---|
| Mixed viscosity at 25 °C | ISO 3219 | 50,000–80,000 mPa·s |
| Pot life at 25 °C | ISO 3219, time to double viscosity | 60–120 min |
| Cure time at 120 °C | ISO 6502, 90% torque plateau | 10 min |
| Hardness | ASTM D2240-15e1 | 60 Shore A |
| Tensile strength | ASTM D412-16 / ISO 37:2017 | 8.0 MPa |
| Elongation at break | ASTM D412-16 / ISO 37:2017 | 350% |
| Tear strength, Die C | ASTM D624-00(2020) | 25 kN/m |
| Specific gravity | ASTM D792-20 | 1.15 |
| Compression set, 22 h at 177 °C | ASTM D395-18 Method B | 20% |
| Linear shrinkage | ISO 2781 | <0.5% |
| Dielectric strength at 2 mm | ASTM D149-20 | 20 kV/mm |
| Volume resistivity | ASTM D257-14 | 1 × 1015 Ω·cm |
| Thermal conductivity | ASTM D5470 | 0.25 W/m·K |
| Service temperature range | ISO 188:2011 hot-air aging | -55 °C to 200 °C |
| Low molecular volatile content | ASTM E595-15, 4 h at 150 °C | <0.5 wt% |
In comparison with condensation-cure room-temperature vulcanizing silicones, RH-SEB-8060 does not release acetic acid, methanol, or oxime during cure. This permits use in sealed electronic enclosures where contact corrosion of copper, brass, or silver-plated connectors is a failure risk. The addition-cure material also exhibits lower irreversible shrinkage after post-cure at 80 °C for 24 h. Relative to peroxide-cured high-consistency silicone rubber, the liquid silicone grade has a lower compression set under high-temperature load and leaves no acidic peroxide decomposition residues. The representative compression set is 20% after 22 h at 177 °C according to ASTM D395-18 Method B. Volatile condensable material is below 0.5 wt% after 4 h at 150 °C by ASTM E595-15, which reduces the risk of optical lens fogging in automotive lighting assemblies. Within the product series, the 8060 suffix corresponds to the nominal 60 Shore A hardness tier; adjacent hardness tiers shift the balance of tensile strength, elongation, and compression set through changes in vinyl polymer molecular weight and treated silica loading. Compared with fluorosilicone grades, RH-SEB-8060 typically provides better hot-air aging but lower resistance to aromatic hydrocarbons, ketones, and concentrated acids. Compared with thermoplastic elastomers, it cannot be remelted or recycled as regrind, and molding scrap is not re-introduced into the melt stream. These differences determine material selection when service temperature exceeds 150 °C or when low outgassing is required in enclosed optical and electronic modules.
| Characteristic | RH-SEB-8060 class | Condensation-cure RTV | Peroxide-cured HCR |
|---|---|---|---|
| Cure byproduct | None | Acetic acid, oxime, or methanol | Peroxide decomposition residues |
| Compression set, 22 h at 177 °C | 20% | 30–50% | 25–40% |
| Linear shrinkage | <0.5% | 0.5–1.5% | 1–2% |
| Low-molecular volatile content | <0.5 wt% | Variable | Variable |
| Processing route | Liquid injection, meter-mix | Manual dispensing, room-temperature cure | Gum stock compression or transfer molding |
Replacement of peroxide-cured high-consistency rubber with RH-SEB-8060 is considered when compression set resistance, dimensional stability, and low volatile content are dominant requirements. In high-temperature sealing applications such as automotive under-hood gaskets, the lower compression set of addition-cure liquid silicone rubber reduces the loss of sealing force after 1,000 h of hot-air aging at 175 °C. The material has been processed on vacuum compression presses with 150 metric tons clamp force and on injection machines with cold-runner systems; production-scale experience indicates that mold temperature must be raised gradually from 120 °C to 160 °C over successive trials to avoid trapped air in deep ribs. The service temperature range extends from -55 °C to 200 °C, with intermittent exposure reported up to 250 °C in hot-air aging, although tensile strength retention above 225 °C depends on filler type and antioxidant package. The product is not recommended for continuous exposure to steam above 150 °C, concentrated acids, ketones, or aromatic hydrocarbon fuels. In fuel-contaminated air streams, fluorosilicone grades should be evaluated instead. Published product-specific data for this configuration is limited; therefore, long-term compression stress relaxation must be measured on the actual finished part according to ISO 3384-1 or ASTM D6147 before design release.
Hydrolytic stability is a known limitation. In hot water above 100 °C for extended periods, siloxane bond hydrolysis can cause reversion and softening. Continuous steam service above 150 °C is not recommended. If steam resistance is required, a peroxide-cured high-consistency silicone with a specialized hydrolytic stabilizer may be selected. Published data for this specific configuration is limited.
Adhesion to plastics and metals is not an inherent property of the base elastomer. RH-SEB-8060 is non-self-priming and requires a silane-based primer or plasma treatment for bonding to polybutylene terephthalate, polyamide 6/6, or aluminum. In insert molding, substrates should be preheated to 120 °C for 30 min to remove surface moisture. The elastomer can be post-cured at 200 °C for 4 h to stabilize physical properties and remove residual silicone volatiles. Post-curing may increase hardness by 2–5 Shore A and reduce elongation at break by 5–10%. These changes are included in the design tolerance stack. Failure to post-cure in enclosed electronic assemblies can result in fogging of lenses from low molecular weight siloxanes. ASTM E595-15 testing after post-cure is required for space-aviation or optical applications. Production-scale experience indicates that a 4 h post-cure at 200 °C lowers collected volatile condensable material below 0.1 wt% in many lots, but batch variation exists.
Compliance status for RH-SEB-8060 depends on formulation and lot-specific certification, not on the base designation alone. Food-contact suitability may be supported by raw material compliance with FDA 21 CFR 177.2600 for rubber articles intended for repeated food-contact use, but the molded article must be tested under end-use conditions. The product can be supplied with documentation for EU RoHS 2011/65/EU and REACH 1907/2006 Article 33 SVHC content below 0.1 wt% when requested from the compounding source. Medical-grade status is not inherent to the base elastomer; ISO 10993-5 cytotoxicity, ISO 10993-10 irritation, and USP Class VI testing must be performed on the finished device after post-cure and sterilization. No universal statement of biocompatibility applies. The material should not be combined with amine-based adhesion promoters, sulfur-containing mold release agents, or tin-catalyzed condensation silicones in the same tooling system. Storage should be in unopened containers at 5–30 °C; shelf life is typically 12 months from the date of manufacture. Containers should be blanketed with dry nitrogen after opening to minimize moisture ingress and filler settling.
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