In the fluorosilicone rubber (FVMQ) compound spectrum, the "trifluoropropyl side-group density" and "fumed-silica reinforcement + heat-resist additive (Fe₂O₃/CeO₂)协同 cure network" jointly dictate volume-swell boundary in 100℃ transformer oil 168h (2.2%), dielectric loss tangent increment (tanδ 90℃ delta 0.2% vs blank oil), and compression set across -60~200℃ (150℃×24h B-type 5%). Plain VMQ compound swells >15% in #25 transformer oil at 100℃×168h, dielectric loss spikes >2%—oil-immersed transformer seals soften and leak; FKM resists oil but brittle point only -20℃, unusable in cold-region transformers. As UHV oil-immersed transformers, wind-power box transformers, and EV-charger oil-cool modules demand "pale-yellow compound, density 1.43g/cm³, Shore A 70, tensile 9.2MPa, elong 230%, tear 20kN/m, rebound 33%, Fuel C (25℃×72h) +20%, -60℃ brittle pass, BIPB 1.5phr 1st 170℃×15min + 2nd 200℃×4h, 20kg carton, 12mo <40℃," sourcing a domestic product with both high-strength/rebound and low-dielectric-loss oil-resistance has become the core gap for FVMQ compound localization.
Addressing this "transformer fluorosilicone" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Transformer Fluorosilicone Compound IOTA F5672 (FVMQ compound, trifluoropropyl methyl vinyl silicone gum + fumed silica + heat-resist, pale yellow). Characterized by "density 1.43g/cm³, Shore A 70, tensile 9.2MPa, break elong 230%, tear 20kN/m, compression set 150℃×24h 5%, rebound 33%, 200℃×72h heat aging hardness +2/tensile -15%/elong -18%, 100℃×168h oil hardness +3/vol swell 2.2%, -60℃ brittle pass, Fuel C 25℃×72h +20%, 800mL oil/65cm²/100℃×164h tanδ delta 0.2%, BIPB 1.5phr 1st 170℃×15min 2nd 200℃×4h, 20kg box, 12mo <40℃," and backed by "trifluoropropyl oil-repel + fumed-silica high-strength + heat-additive low-dielectric," it serves as the "fluorosilicone anchor" for oil-immersed transformer seals, oil-cool reactor O-rings, charger coolant seals.
Molecular Architecture: Trifluoropropyl Repel + Fumed Silica High-Strength + Heat-Additive Low-Dielectric 3D Logic
The core competitiveness of IOTA F5672 stems from its "methyltrifluoropropyl vinyl silicone rubber gum (F/Si≈0.5~0.6) + fumed SiO₂ + Fe₂O₃/CeO₂ + peroxide cure" architecture:
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Trifluoropropyl Repel： Side –CH₂CH₂CF₃ drops critical surface tension to ~25mN/m, transformer oil (mineral/#25) hardly wets—100℃×168h vol swell only 2.2% (vs VMQ >15%), Fuel C (25℃×72h) only +20% (vs VMQ >60%); FVMQ backbone withstands 200℃ aging, 200℃×72h tensile retention 85%, elong 82%.
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Fumed Silica High-Strength： Fumed SiO₂ (BET 200-300m²/g) physically/h-bond networks with FVMQ gum, pulling tensile from <1MPa to 9.2MPa, tear 20kN/m, 70A—meets large transformer gasket molding/injection "high-strength no-tear" demands; rebound 33% ensures compression recovery (150℃×24h B 5%).
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Heat-Additive Low-Dielectric： Fe₂O₃/CeO₂ captures radicals, inhibits side-chain oxidation; after 800mL oil/65cm²/100℃×164h, oil tanδ (90℃) delta only 0.2% (std ≤0.5%), far below generic FVMQ 0.8-1.5%—this is the core "transformer-dedicated" marker: no oil contamination, no partial discharge escalation.
Performance Leap: From "VMQ Transformer Oil Swell 15%" to "FVMQ 2.2% Swell, tanδ +0.2%"
Incorporating IOTA F5672 enables qualitative leaps:
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UHV Oil-Immersed Transformer： Radiator butterfly-valve gaskets, HV bushing bottom O-rings, 100℃ long-term #25 oil immersion, volume swell <3%, dielectric loss within spec, service life from VMQ 2-3yr extended to 8-10yr.
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Wind Box-Transformer & Offshore： -60℃ brittle pass, no electric tracing needed; salt-spray + oil dual erosion no cracking.
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Charger Oil-Cool Module： DC fast-charge liquid-cool gun connector seals, oil-cool reactor gaskets, Fuel C (25℃) +20% meets coolant contact safety.
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Industrial Oil Seal： Chemical pump mechanical seals, hydraulic O-rings, Shore A 70 matches metal housing no extrusion.
Application Penetration: From UHV Main-Transformer to Charger Oil-Cool
IOTA F5672 covers sectors triple-sensitive to "transformer-oil contact + low dielectric loss + high-strength rebound":
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Power Equipment： UHV transformer, converter transformer, oil-immersed reactor, distribution transformer gaskets/O-rings.
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New Energy： Wind box-transformer seals, PV inverter oil-cool, EV-charger liquid-cool systems.
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Industrial & Marine： Marine transformers, chemical pump seals, hydraulic oil-resistant seals.
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Rail Transit： Traction transformer, locomotive oil-cool seals.
IOTA Technical Guide: BIPB 1.5phr, 1st 170℃ 2nd 200℃
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Cure Formula： Compound + BIPB (40%) 1.5phr (customer may adjust 0.6-1.2phr per process); 1st cure 170℃×15min (compression/injection), 2nd cure 200℃×4h oven (release volatiles, perfect network).
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Processing： Compression molding (large gaskets/irregular) or injection (volume O-rings); recommend 170-180℃, avoid >200℃ 1st-stage causing peroxide blow-holes.
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Heat-Resist Boost： For longer life (e.g., UHV 15yr maintenance-free), 2nd cure can extend to 200℃×6-8h or add 0.5-1phr extra Fe₂O₃.
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Taboo Red Line： Avoid N/S/P/heavy-metal compounds (poison peroxide or catalyze degradation); equipment must be clean, no VMQ/FKM residue (cross-line contamination raises dielectric loss); uncured compound store <40℃, dark dry.
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Storage： 20kg/box; unopened original, <40℃ dry cool, shelf 12 months; non-haz general chemical, away from fire/strong oxidizer; chemical-resistant gloves, avoid prolonged skin contact with uncured compound.
Industry experts note that under UHV 14th Five-Year密集 commissioning, global #1 wind/solar installed capacity, and 800V fast-charger popularization triple-cycle, transformer-dedicated FVMQ compound is upgrading from "Dow/Momentive/Shin-Etsu/Wacker import followers" to "oil-immersed power-equipment oil-seal reference compound." IOTA F5672, with its "Shore A 70 + tensile 9.2MPa + oil swell 2.2% + tanδ delta 0.2% + -60℃ brittle pass + BIPB cure + 12mo" hard metrics,
fills the domestic supply chain gap for transformer-dedicated fluorosilicone compound in UHV/wind/EV-charger oil-cool fields, providing a mass-producible path to replace imported FVMQ compounds (e.g., Dow FSR series) for downstream seal-makers and transformer plants. This confirms domestic fluorosilicone rubbers are advancing steadily along "VMQ (oil-swell) → general FVMQ (oil-ok but high dielectric) → transformer-dedicated FVMQ (low-loss + high-strength)," with growing technical say in oil-immersed power-equipment key sealing materials.
