On the HTV silicone gum spectrum,
110 series = vinyl-bis-terminated methyl vinyl silicone (VMQ) is the universal mother-gum for peroxide-cured compounds; versus 112 (methyl-terminated), 110's terminal Vi gives stronger chain-growth during cure—better tensile/tear and lower compression set. As electronic seals demand -60~250℃ long life, NEV cables demand high insulation with low outgassing, and molded parts demand stable batch Mooney, a
colorless transparent gum, Mw 45-70万, 150℃/3h volatile ≤3%, three vinyl tiers continuous emerges as the domestic general-base turning "vinyl concentration" into a crosslink-density knob.
Addressing this "vinyl-bis-terminated general HTV" slot,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) releases
Methyl Vinyl Silicone Rubber IOTA 3110 (market aliases 110-1/110-2/110-3). Defined by core mechanism—
CH₂=CH–SiMe₂O–(Me₂SiO)ₙ–(MeViSiO)ₘ–SiMe₂–CH=CH₂, terminal+side Vi co-feed peroxide cure, PDMS backbone for heat—it carries the triple attributes of
"three-tier vinyl selectable + low-vol clean + non-stick milling," serving as the "VMQ gum anchor" for electronic elastomers, insulating tubes, and molded seals.
Molecular Architecture: Terminal+Side Vi Dual-Port Cure
IOTA 3110 general formula CH₂=CH–SiMe₂O–[(Me₂SiO)ₐ(MeViSiO)ᵦ]–SiMe₂–CH=CH₂:
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Terminal Vi Chain Growth: Both-end Vi under DBPH/dicumyl not only crosslinks but extends chains early in cure, yielding more uniform nodes—higher tensile/tear than methyl-terminated 112 at same vinyl load.
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Side Vi Density Tiers: 110-1 (0.07-0.12%) soft/high-elongation; 110-2 (0.13-0.18%) balanced; 110-3 (0.19-0.24%) harder/faster/low-compression.
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Mw 45-70万 Narrow: Moderate Mooney, fast fumed-silica uptake, no mill-stick, smooth extrusion; <40万 loses strength, >80万 high mix power.
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Volatile ≤3% Clean: 150℃/3h loss controlled; post-cure (200℃×2-4h) CVCM low, eases electronic/food-grade compliance.
Performance Leap: From Single Grade to Three-Tier Ordering
In electronic seal, cable insulation, and molded mechanical part contexts, 3110 tiers divide labor:
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110-1 (low Vi): Soft-touch keypad, medical tubing, low-duro (30-40A) mold, elongation >500%.
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110-2 (mid Vi): General electronic O-ring, insulating sleeve, cable extrusion gum—most blended tier.
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110-3 (high Vi): High-strength gasket, compression-set-resistant seal, flame-retardant base; fast cure, post-cure CS <15%.
Application Penetration: From Keypad to NEV Cable
IOTA 3110 precisely lands where
"general VMQ HTV, vinyl tunable, domestic batch-stable" is needed:
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Electronics: Keypad pads, connector seals, HV cable insulation extrusion, capacitor sleeves.
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Mechanical: Dampers, buffer blocks, dynamic seals, conveyor hoses.
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Specialty: Medical catheter base (needs further food/medical cert), translucent molded parts, FR compound mother.
IOTA Technical Guide: Pick Vi by Durometer, Control Post-Cure
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Tier Rule: Shore A 30-50 → 110-1; 50-70 → 110-2; 70-80+ → 110-3; often blend 110-1+110-3 for mid.
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Compound: Gum 100 / fumed SiO₂ 35-50 / struct-control (R05 or hydroxy oil) 2-4 / peroxide (dicumperoxide) 0.5-1.0; band first then filler.
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Cure: Mold 170-180℃×5-10min; post-cure 200℃×2-4h for volatile purge and CS stability.
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No-Go Zones: Gum avoids water/base (terminal Vi acid-rearrange); no strong oxidizer co-store; >40℃ long open raises volatile and slightly loses terminal Vi; mixed stock not left open (silica structuring).
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Storage: 25kg carton PE-lined; <40℃ sealed 12 months (IOTA wider 3110/3112 family lists 3 yr, this 110-1/2/3 per origin page 12 mo); non-haz.
HTV compounders read 3110 plainly: it is the domestic isomorphic of
WACKER MVQ 1100, Shin-Etsu KE-1600, Momentive VMQ 110—vinyl-bis-terminated, 110-1/2/3 tiers aligned to GB/T 28610-2020 MVQ110-1/2/3, Mw and volatile numbers matched. The value is not new polymerization but making "vinyl concentration" an orderable variable so electronic-seal and cable plants swap import 110-series without re-tuning major formula.
