In the addition-cure LSR spectrum, the "mole ratio of phenyl on backbone (low 5-10% break-crystal, mid damp, high radiate)" and "vinyl-end + Pt 1:1 addition network" jointly dictate flexibility retention at -100℃ liquid-N₂ boundary, thermal-stable boundary at 250℃ long-term, and dielectric constant (≤2.8@1MHz) with volume resistance (≥1×10¹³Ω·cm) boundary. Plain VMQ-LSR has ε~2.9-3.0 and crystallizes below -55℃; all-phenyl LSR loses transparency and costs spike. As precision electronic potting, HF connector insulation, cryo-sensor encapsulation, and medical transparent parts demand "2-part 1:1, A 1000-1500cps/B 500-800cps, 25℃ pot-life 1h, coning 200-300 (semi-grease), electric strength ≥20MV/m, ε(1MHz)≤2.8, vol-res ≥1×10¹³Ω·cm, transparent," sourcing a Pt-catalyzed domestic product avoiding N/S/P/Sn poison has become the core gap for phenyl-LSR localization.
Addressing this "phenyl low-dielectric" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Phenyl Liquid Silicone Rubber IOTA 3620 (2-part addition methylphenylvinyl polysiloxane, A/B transparent 1:1). Characterized by "pre-cure A transparent 1000-1500mPa·s, B 500-800mPa·s, A:B 1:1, 25℃ pot-life 1h; post-cure coning 200-300, electric strength ≥20MV/m, ε(1MHz)≤2.8, vol-res ≥1.0×10¹³Ω·cm, Pt-catalyzed, avoid amine/S/P/Sn poison," and backed by "phenyl break-crystal wide-temp + Pt 1:1 no-byproduct + low-dielectric insulation," it serves as the "phenyl anchor" for electronic potting/insulation/cryo-transparent elastomer.
Molecular Architecture: Phenyl Break-Crystal + Pt 1:1 No-Byproduct + Low-Dielectric 3D Logic
The core competitiveness of IOTA 3620 stems from its "Part A: vinyl methylphenyl polysiloxane + Pt (Karstedt); Part B: methylphenyl SiH polysiloxane + thixotrope" architecture:
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Phenyl Break-Crystal Wide-Temp： Backbone methyl/phenyl co-substitution (low-phenyl window), phenyl steric disrupts side-methyl ordering, no crystallize below -60℃, π-conjugation lifts heat endurance toward 250℃ continuous; vs VMQ-LSR, brittle limit pushed from -55℃ to -100℃ class.
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Pt 1:1 No-Byproduct： A/B 1:1 mix, end-vinyl + SiH addition, no alcohol/water/acetic acid, zero shrink, no corrode, precise component encapsulation; 25℃ 1h pot-life for manual/low-pressure pour, coning 200-300 means "semi-grease elastomer"—softer than LSR, stiffer than gel, shock-proof no slump.
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Low-Dielectric： Phenyl polarizability slightly higher than methyl, but 3620 keeps phenyl in low-mid sweet-spot, ε(1MHz)≤2.8 (below pure VMQ 2.95), vol-res ≥1×10¹³, electric strength ≥20MV/m, HF loss flat—fits 5G/mmWave encapsulation.
Performance Leap: From "VMQ-LSR -55℃ Crystallize" to "Phenyl LSR ε2.8@1MHz"
Incorporating IOTA 3620 enables qualitative leaps:
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Precision Potting： HF filter, SAW element, photodiode header—coning 200-300 holds leads, 1MHz low loss, low insertion loss.
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Cryo Sensor： LN₂ level probe, outdoor RTU board—flexible at -100℃, vol-res intact.
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Transparent Insulation： High-voltage LED lens bond, transparent electrode encap—visible transmit, ≥20MV/m strength.
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Medical/Lab： Transparent low-toxic (Pt) tube joint, cell-culture seal, replaces some UV glues.
Application Penetration: From SAW Filter to LN₂ Probe
IOTA 3620 covers sectors triple-sensitive to "transparent + low-dielectric + wide-temp flexible":
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Electronics： HF potting, connector insulation, PCB thick conformal, transformer aux seal.
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Sensor & Instrument： Cryo/wide-temp sensor encap, lab optic bond, vacuum flange insulator.
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Medical Transparent： Catheter joint, drainage part, IVD consumable.
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Specialty： Space cryo electronic block, nuclear outer low-pressure potting.
IOTA Technical Guide: Same-Batch 1:1, Avoid Pt Poison
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Mix： A/B same batch 1:1 by mass (err <2%), hand/static mix, vac degas (-0.095MPa×2-3min); 25℃ pot-life 1h, over-time thickens.
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Cure： RT slow cure, recommend heat (ref LSR 3620 130℃×90s/2mm; phenyl 3620 lower coning can extend to 125-150℃×few-min to tens-min by thickness); no mandatory 2nd cure but thick parts suggest 150℃×1h anneal.
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Phenyl Select： 3620 = low-mid phenyl, wide-temp transparent insulation; higher radiation need pick high-phenyl grade; food-contact pick non-phenyl LSR 3620 branch.
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Taboo Red Line： Pt in A, strict no amine/thiol/sulfur-rubber/organotin/phosphorus (poison no-cure); exclusive tools, never share with epoxy/PU/RTV; reseal A/B separately moisture-proof.
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Storage： Ref same-series 200kg/drum (your sheet unspec, A/B separate); cool <23℃ (or per label) dark sealed, shelf ref same-series 12 months; non-haz general chemical, ventilate, nitrile gloves.
Industry experts note that under 5G mmWave devices, cryo-electronics, and medical transparent silicone triple-cycle, phenyl LSR is upgrading from "Wacker/Shin-Etsu/Momentive ELAS-TOSIL® LR phenyl-branch import followers" to "wide-temp low-dielectric transparent insulation reference liquid". IOTA 3620, with its "1:1 RT 1h + A 1000-1500cps/B 500-800cps + coning 200-300 + ε≤2.8@1MHz + vol-res ≥10¹³ + electric ≥20MV/m" hard metrics,
fills the domestic supply chain gap for phenyl liquid silicone rubber in precision potting/cryo-transparent insulation fields, providing a mass-producible path to replace imported phenyl LSR for downstream electronic-packaging and sensor makers. This confirms domestic LSR is advancing steadily along "VMQ-LSR (general) → food-grade LSR 3620 (post-cure-free) → phenyl LSR 3620 (low-dielectric wide-temp)," with growing technical say in HF-insulation and cryo-transparent encapsulation key materials.
