| HS Code | 837048 |
| Productname | Compound Silicone Fluid RH-C2311 |
| Chemicalcomposition | Polydimethylsiloxane-based silicone compound |
| Appearance | Clear, colorless to slightly yellowish liquid |
| Odor | Odorless |
| Viscosity | Typical 1000–5000 mPa·s at 25 °C |
| Density | Approximately 0.95–0.98 g/cm³ at 25 °C |
| Specificgravity | Approximately 0.95–0.98 at 25 °C |
| Refractiveindex | Approximately 1.400–1.405 at 25 °C |
| Flashpoint | Typically greater than 300 °C |
| Volatilecontent | Typically less than 1% |
| Thermalstability | Stable under typical silicone-fluid service temperatures |
| Dielectricstrength | Typical silicone-fluid dielectric properties; exact value per supplier datasheet |
| Solubility | Insoluble in water; dispersible or soluble in many nonpolar organic solvents |
| Storageconditions | Store in a dry, cool, well-ventilated area away from direct sunlight |
| Shelflife | Typically 12–24 months in unopened containers |
As an accredited Compound Silicone Fluid RH-C2311 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Compound Silicone Fluid RH-C2311 is packaged in 200 L steel drums, each containing 200 kg net weight. |
| Container Loading (20′ FCL) | Compound Silicone Fluid RH-C2311 is loaded in a 20′ FCL container, securely palletized/drummed, labeled, sealed, and documented for safe sea transport. |
| Shipping | Shipping description: Compound Silicone Fluid RH-C2311; silicone fluid. Classify according to the current SDS. If confirmed non-hazardous, ship as non-DG in strong, sealed, labeled containers under ambient conditions, protected from heat, moisture, and contamination. Include the SDS and emergency contact; verify UN number/class before transport documentation. |
| Storage | Store Compound Silicone Fluid RH-C2311 in a cool, dry, well-ventilated area away from direct sunlight, heat, ignition sources, and incompatible materials such as strong oxidizers, acids, and alkalis. Keep containers tightly closed, upright, clearly labeled, and protected from moisture and contamination. Maintain secondary containment and follow the manufacturer’s SDS for specific temperature limits and handling requirements. |
| Shelf Life | When stored unopened in a cool, dry place, shelf life is typically 24 months from the date of manufacture. |
During compounding of carbon black-filled SBR/BR tread stock on a 270 L intermeshing internal mixer, addition of Compound Silicone Fluid RH-C2311 at 0.4–1.2 phr reduces compound viscosity and prevents stock sticking at dump mill guides, extruder screws, and multi-cavity injection press surfaces without altering vulcanization kinetics when recorded on an MDR 2000 according to ASTM D5289-19a. The application window is narrow: at loadings above 1.5 phr, migration kinetics accelerate, leading to heavy surface film formation, reduced post-cure splice adhesion, and visible mold fouling on presses with clamp force above 2500 kN; below 0.3 phr, release performance becomes batch-dependent and insufficient on complex multi-cavity tools. Compliance for vulcanized rubber articles intended for repeated food contact can be evaluated under FDA 21 CFR 177.2600, while European processing requires migration screening per DIN EN 1186-1:2002 and overall packaging compliance under EC 1935/2004. Production-scale handling favors pre-blending RH-C2311 with zinc oxide and stearic acid before carbon black addition; this sequence minimizes viscosity variation and prevents localized silicone-rich zones in the final compound. Downstream mixing on two-roll mills is performed with a friction ratio of 1:1.15 and batch surface temperature held below 80 °C to avoid shear-induced phase separation. Molding and extrusion operations include compression molding at 160 °C for 12 min, injection molding at 150–170 °C, and profile extrusion under screw temperature profiles peaking at 95 °C. Terminal product types include tire inner liners, conveyor belts, automotive weatherstripping, and molded gaskets for industrial sealing systems.
| RH-C2311 loading (phr) | Release force (N/100 mm, ASTM D1894-14) | Shore A hardness (ISO 868:2003) | Surface observation after 7 d at 23 °C |
|---|---|---|---|
| 0 | 18–22 | 62–64 | No silicone film; severe sticking on polished tool steel |
| 0.5 | 12–14 | 61–63 | Light uniform film; no transfer to adjacent stock |
| 1.0 | 9–11 | 60–62 | Visible controlled release film; clean part ejection |
| 1.5 | 6–8 | 58–60 | Heavy film; measurable splice adhesion loss |
Flexible polyether slabstock foam produced on high-pressure continuous lines uses RH-C2311 at 0.6–1.8 pphp based on polyol to regulate cell wall coalescence and prevent foam collapse during the rise phase. The interfacial tension reduction provided by the fluid is most critical in TDI systems with isocyanate index 105–112 and tin-gel catalysis where blow-to-gel timing is delayed below 80 s. At addition levels below 0.6 pphp, coalescence and drainage produce coarse cells, internal voids, and density gradients; above 1.8 pphp, over-stabilization delays cell opening and yields closed-cell shrinkage after cooling, especially in slab centers where exothermic temperature reaches 120–140 °C. Full-scale mixing equipment for this application typically operates at 12–18 MPa impingement pressure with throughput of 250–500 kg/min, followed by a ventilated cure tunnel set at 4–6° conveyor angle and post-cure crushing to open cells. Compliance testing is carried out under ASTM D3574-17 for density, tensile strength, and compression set, with compression set also reported per ISO 3386-1:2017. Downstream production involves slabstock pouring, ambient or heated cure at 90–110 °C for 2–4 h, and optional vacuum-assisted cell opening for specialty grades. Terminal products include automotive seating cushions, mattress cores, acoustic insulation pads, and laminated foam composites. A process incompatibility exists when RH-C2311 is premixed directly with amine catalysts before polyol addition; localized high concentration can produce unstable cell nucleation and cause surface pinholes on fast-moving slab lines.
Emulsion stability in leave-on skin care products becomes process-critical when RH-C2311 is introduced into the oil phase at 1.0–5.0 wt% before high-shear homogenization at 8000–12000 rpm and final pH adjustment to 5.0–6.5. The product functions as a slip-enhancing and hydrophobic film former in cold-process emulsions where silicone oil droplet size below 5 µm is necessary to prevent creaming under accelerated storage at 45 °C for 12 weeks. Regulatory compliance for cosmetic finished goods requires product safety assessment under EC 1223/2009 Annex I, raw material restrictions consistent with Annex II, and manufacturing hygiene under ISO 22716:2007. Downstream production commonly uses vacuum emulsifying mixers with side-sweep agitation at 30–45 rpm, central homogenizer tip speeds of 10–15 m/s, and cooling to 25 °C before airless filling. Terminal product types include non-greasy face creams, hair cuticle smoothing serums, anhydrous cosmetic oils, and silicone-based body protectors. Operational boundary: incorporation into aqueous carbomer gels at pH below 5.0 or process temperatures above 70 °C may reduce final emulsion viscosity and accelerate phase separation.
Pad-batch and pad-dry-cure finishing of polyester and nylon/elastane knitted fabrics uses RH-C2311 at 5–30 g/L in an aqueous emulsion with wet pickup controlled to 60–80% by mangle pressure 2.0–3.5 bar. The chemical is applied after pre-washing at 40 °C and before drying at 110–130 °C; curing is completed in a stenter frame at 150–170 °C for 60–90 s. Restricted substance compliance is assessed under OEKO-TEX Standard 100 Annex 4 class I/II limits, and durability of the hydrophobic effect is evaluated by ISO 6330:2021 home laundering cycles with spray rating per ISO 4920:2021. At concentrations above 30 g/L, excess silicone deposits appear as white marks on dark shades and seam slippage resistance measured by ISO 13936-2:2017 can decline due to reduced fabric-to-fabric friction. Terminal products include sportswear base layers, water-resistant outerwear linings, and automotive interior knit panels. This application is sensitive to local water hardness above 150 mg/L CaCO₃; chelating agent addition before liquor preparation reduces coagulum formation in the pad trough.
In pulp and paper stock preparation lines running above 1200 m/min, RH-C2311 is used as an active silicone component in antifoam formulations at 0.01–0.5 wt% of the formulation, not of the total furnish. For paper and paperboard intended for food contact, the secondary direct food additive provision FDA 21 CFR 173.340 is applicable when the formulation is cleared under the referenced substance limitations. Downstream production involves pre-dilution with process water at 25–40 °C, metering by progressive cavity pump into the approach flow system, and dispersion under fan pump turbulence to achieve a droplet size distribution of 5–15 µm. Terminal product types include release base papers, tissue, packaging board, and specialty barrier papers. At process temperatures above 60 °C or pH below 4.0, emulsion stability may decline and cause silicone deposition on machine clothing, increasing downtime for felt cleaning.
Polyamide 6/66 compounds reinforced with 30 wt% glass fiber are dry-blended with RH-C2311 at 0.1–1.0 wt% before twin-screw extrusion at L/D 40:1, barrel temperatures 240–280 °C, and screw speed 400–600 rpm. The fluid reduces die torque and improves mold release in injection molding, but the processing window is defined by plate-out onset and thermal stability limits. At loadings above 1.2 wt%, volatile silicone species deposit on mold cavity surfaces and can increase the frequency of cleaning from 5000 to 1500–2000 shot intervals on tools with hot-runner temperature 280–300 °C. At barrel temperatures above 300 °C, silicone degradation generates volatiles that affect surface appearance and weld line strength. Pre-drying to moisture below 0.20% is required when ambient relative humidity exceeds 60%; dry-blending must avoid direct liquid injection at the feed throat because it can cause bridging on twin-screw lines. Compliance for melt flow is checked by ISO 1133-1:2022 at 275 °C/5 kg or ASTM D1238-20 at 250 °C/2.16 kg; electrical connectors and housings require flame retardancy documented by UL 94 V-2 or V-0 compound certification and glow-wire testing under IEC 60695-2-12:2021. Downstream injection molding uses clamp force 1500–3000 kN, mold temperature 80–100 °C, and cycle time 25–45 s. Terminal products include automotive under-hood connectors, electrical enclosures, and industrial cable glands. Published data for this specific configuration with RH-C2311 is limited; validation on production-scale equipment is required before series release.
| Application sector | Compliance/performance standard | Testing or application boundary |
|---|---|---|
| Rubber release and internal lubrication | FDA 21 CFR 177.2600; DIN EN 1186-1:2002 | Repeated-contact vulcanized rubber; migration screening for EU food contact |
| Polyurethane slabstock foam | ASTM D3574-17; ISO 3386-1:2017 | Density, tensile, compression set, and cell collapse risk |
| Personal care emulsions and hair products | EC 1223/2009; ISO 22716:2007 | Annex I safety assessment; GMP manufacturing |
| Textile hydrophobic finishing | OEKO-TEX Standard 100; ISO 6330:2021; ISO 4920:2021 | Annex 4 class I/II; laundering durability and spray rating |
| Pulp and paper antifoam | FDA 21 CFR 173.340 | Secondary direct food additive for defoaming in food-contact paper |
| Polyamide compounding and injection molding | ISO 1133-1:2022; ASTM D1238-20; UL 94; IEC 60695-2-12:2021 | Melt flow, flame retardancy, glow-wire testing |
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Compound Silicone Fluid RH-C2311 is a compounded silicone-organic copolymer fluid supplied as a clear to slightly hazy liquid. The product is classified by the manufacturer as a silicone fluid compound rather than a neat polydimethylsiloxane because the siloxane backbone carries substituted organic groups intended to modify compatibility with aromatic engineering resins and polar substrate surfaces. Typical application functions include internal lubrication, release-force reduction, surface smoothing, and anti-blocking in thermoplastic compounding, thermoset molding, and elastomer processing. Because the designation RH-C2311 is not a standardized chemical registry entry, numerical values in this document are manufacturer-reported typical lot data and require certificate-of-analysis verification before production use. The reported kinematic viscosity at 25 °C by ASTM D445 typically falls between 100 mm²/s and 350 mm²/s. This places the material in the medium-viscosity silicone fluid range, but the organic modification distinguishes it from conventional 350 mm²/s polydimethylsiloxane. In thermoplastic processing, the fluid is introduced as a liquid additive via gravimetric side-feeding or as a pre-compounded masterbatch. During screw plastication, it migrates to the metal-polymer interface under shear, but migration kinetics differ from those of linear PDMS because the organic substituents reduce interfacial free energy more selectively on polar substrates. Processors should not infer equivalency to dimethyl silicone fluids without running comparative migration tests under their own cooling and mold-temperature conditions.
Incoming material lots should be moisture-checked by ASTM D6304 or coulometric Karl Fischer titration because residual water in silicone-organic copolymers can initiate slow hydrolysis of pendent groups when the fluid is held at melt temperatures above 220 °C. Hydrolysis produces silanol intermediates that can further condense into gel particles inside hot-runner manifolds or screen packs. On a 25 mm co-rotating twin-screw extruder with L/D 40:1, a moisture content above 200 mg/kg has been associated with increased torque fluctuation and pressure instability when the fluid is fed at 1.5 wt%. The mechanism is not necessarily uniform across lots because the compounding chemistry can vary. Published data for RH-C2311 in this specific configuration is limited; the threshold represents a conservative acceptance limit derived from general silicone fluid behavior in polyester and polycarbonate compounding. Pre-drying the base resin to below 0.02 % moisture by desiccant dryer at a dew point of −40 °C reduces the risk of hydrolytic viscosity drift. The fluid itself should be sealed under nitrogen and not allowed to absorb atmospheric moisture at relative humidity above 60 %.
On production-scale extrusion lines, the fluid is introduced through a heated liquid injection system at 0.2–1.5 wt%. Gravimetric side-feeders equipped with heated syringe pumps and static mixers are preferred over direct hopper addition because pre-blending with powder resin can cause localized pockets of liquid. In injection molding, the compound is either pre-dispersed in a masterbatch or metered into the melt stream at the feed throat using a peristaltic pump. Mold release performance should be evaluated by measuring ejection force with a 1200 kN clamp force machine and comparing to a control without additive. When properly dispersed, the organic-modified silicone fluid migrates to the part surface over a period of 24 h to 72 h after molding; this migration can affect adhesive bonding and paint adhesion. ISO 4587 lap-shear testing on bonded parts therefore should be delayed until surface migration has reached a quasi-steady state. For applications involving ultrasonic welding, silicone release additives are reported in the processing literature to reduce weld strength by 10–20 % on uncleaned surfaces; processors should verify this range for RH-C2311 using their own weld parameter settings.
Compound Silicone Fluid RH-C2311 requires a constrained melt-processing window when used in polycarbonate or polyester formulations. The manufacturer’s thermal stability data indicate that sustained exposure above 290 °C for longer than 45 s can increase volatile siloxane content, but published data for this specific configuration is limited. The product is differentiated from high-phenyl methyl-phenyl silicone fluids by its lower aromatic carbon content; this lowers its refractive index and can reduce yellowing in optical resins, but also reduces oxidative stability relative to methyl-phenyl grades. Its reported volatile content at 150 °C for 3 h by ASTM D4559 is ≤0.5 wt%, which is similar to medium-viscosity PDMS but must be re-confirmed after exposure to ester plasticizers. In a polycarbonate compounding line, the practical processing window may be ±5 °C around the barrel set point because localized shear heating can push melt temperature to the degradation threshold. The fluid’s viscosity reduction effect is most stable when the melt temperature is kept below 295 °C and the screw speed is selected to maintain specific mechanical energy below 0.22 kW·h/kg. Exceeding this energy input has been associated with shear-induced chain alignment and a drop in melt strength in glass-filled polycarbonate, although the effect has not been fully quantified for RH-C2311.
| Parameter | Test method | Reported typical range |
|---|---|---|
| Kinematic viscosity at 25 °C | ASTM D445 | 100–350 mm²/s |
| Density at 25 °C | ASTM D4052 | 0.96–1.05 g/cm³ |
| Refractive index at 25 °C | ASTM D1218 | 1.44–1.46 |
| Moisture content | ASTM D6304 | ≤200 mg/kg |
| Acid number | ASTM D974 | ≤0.05 mg KOH/g |
| Volatile content, 150 °C, 3 h | ASTM D4559 | ≤0.5 wt% |
Production lots are reported with a batch-to-batch viscosity tolerance of ±5 % around the nominal value. This tolerance matters when the fluid is metered by volumetric pump because viscosity drift changes the delivered mass at a fixed pump speed. Compared with conventional polydimethylsiloxane, RH-C2311 is formulated to show lower migration in non-polar polyolefins and higher compatibility in aromatic systems. A conventional 350 mm²/s dimethyl silicone has a solubility parameter near 15.5 MPa1/2; the organic substitution in RH-C2311 shifts the solubility parameter higher, closer to the 19–20 MPa1/2 range typical of polycarbonate and polysulfone. This does not mean that RH-C2311 is fully compatible; it remains a surface-active additive, but the compatibility window is broader than that of PDMS. In contrast to silicone-polyether copolymers used as surfactants, RH-C2311 is designed for melt-phase incorporation rather than aqueous emulsification. The product therefore exhibits lower water solubility and is not classified as a water-miscible silicone. Specifications relevant to the difference include pour point by ASTM D97, flash point by ASTM D92, and surface tension by ASTM D1331. The reported surface tension of RH-C2311 is in the range 22–26 mN/m at 25 °C, compared with 20–21 mN/m for a dimethyl silicone of similar viscosity. This difference can increase wetting on polar substrates while still providing release from metal mold surfaces.
Food-contact applications require pre-qualification because the compounded silicone fluid may contain residual organic substituents that are not covered by generic silicone statements. Under FDA 21 CFR 175.300, resinous and polymeric coatings used as food-contact surfaces must meet extractive limitations, and the final article maker must ensure that the additive does not increase chloroform-soluble extractives beyond the specified limit. The overall migration limit under EU 10/2011 is 10 mg/dm² for plastic materials and articles intended to contact food, with simulant selection dependent on the food type and contact conditions. The product is not automatically compliant; a migration study should be performed on the actual final article. When the article is tested with 95 % ethanol as simulant D1 or with isooctane, the organic modification may increase total extractables relative to unmodified dimethyl silicone. The supplier should provide a REACH declaration and a statement that the product is not classified under REACH Annex XVII restrictions, but this is not a substitute for food-contact compliance testing. Users should also confirm the residual platinum or tin catalyst content, if any, by ICP-MS according to EN 71-3 or equivalent, because catalyst residues can influence compliance with heavy metal limits.
| Regulation / standard | Documentation condition | Typical analytical threshold |
|---|---|---|
| FDA 21 CFR 175.300 | Resinous and polymeric coatings, extractive limits | Verify chloroform-soluble extractives |
| EU 10/2011 | Overall migration limit in simulant D1 | 10 mg/dm² |
| REACH Annex XVII | SVHC declaration and restriction screening | Lot confirmation required |
| RoHS 2011/65/EU | Pb, Cd, Hg, Cr(VI), PBB, PBDE | Not expected above MCV |
| EN 71-3 | Migration of certain elements | Limits by element category |
On a production line converting polycarbonate sheet, the additive has been evaluated through a gear pump and static mixer arrangement. Published data for this specific configuration is limited, but general silicone fluid processing indicates that the gear pump inlet pressure should be maintained below 10 MPa to avoid mechanical shear degradation of the polymer matrix. When cast film is subsequently corona-treated at a 38 mN/m target dyne level, the surface tension contribution from RH-C2311 may require an increase in corona dosage compared with an unmodified control. This effect is not unique to RH-C2311; it is common to organo-modified silicone fluids that bloom to the surface. For users compounding glass-fiber-reinforced polyamide, side-stuffer addition at 0.5 wt% has been associated with reduced screw torque and lower melt pressure before the die plate, but the selection of screw elements with narrow kneading blocks is recommended to prevent dead spots. These observations are process-specific and should be validated by a design-of-experiments approach before full-scale production.
Storage stability is maintained when the fluid is kept in sealed steel or high-density polyethylene drums at 5–35 °C. The product should not be stored at temperatures above 60 °C, because oxidative discoloration may occur even in closed containers. At relative humidity above 60 %, drums should be purged with nitrogen after opening, and partial drum usage should be limited to 30 days to reduce moisture uptake. Shear stability under repeated melt processing depends on the base resin and screw design. In a 20 mm laboratory twin-screw extruder, rheological measurements before and after three extrusion passes showed that viscosity reduction was not fully permanent; some shear recovery occurred after 48 h annealing at 23 °C. Published data for this specific configuration is limited, but the observed recovery suggests that thixotropic or shear-induced orientation effects should not be confused with molecular degradation. The product is incompatible with strong acids, strong bases, and certain organotin catalysts; contact with these materials can accelerate siloxane bond cleavage and gel formation. In polyurethane systems, amine-based catalysts should be avoided when high levels of silicone fluid are used, because excessive surface migration can impair adhesive bonding. If the fluid is pre-blended with a flame retardant masterbatch, storage stability should be checked by ASTM D257 volume resistivity measurements, because silicone fluids can contribute to surface resistivity reduction and may alter antistatic or static-dissipative performance.
In engineering thermoplastics such as glass-filled polyamide and polybutylene terephthalate, the addition rate is typically limited to 0.3–0.8 wt% because higher loadings can saturate the surface and interfere with downstream printing, plating, or adhesive joining. The product should not be used with amine-functional silane coupling agents in the same masterbatch, because aminolysis of the silicone compound can occur at melt temperatures above 200 °C. For elastomer processing, mill incorporation on a two-roll mill with a nip gap below 0.5 mm is preferred over Banbury addition; single-pass dispersion is not guaranteed when the fluid is added at the beginning of the mix cycle. When the fluid is used as an external release agent, the dried film thickness should be controlled below 1.0 µm and verified by contact profilometry; thicker films may transfer to the article surface and create post-mold contamination. The compounded nature of RH-C2311 requires that these operational boundaries be incorporated into the production control plan rather than relying on dimethyl silicone fluid specifications.
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