In the personal-care volatile cyclic silicone spectrum, the "D5 (cyclopentasiloxane)/D6 (cyclohexasiloxane) ratio" and "D3/D4 impurity ceiling" jointly dictate spread speed on skin/hair, dry-down residue, solid-pigment wetting power, and global cosmetic regulatory compliance boundary. Pure D5 (Dow DC-245 class) flashes fast with slight dry snap; pure D6 is slower but costlier and heavier-feel. As skincare sunscreens, foundation/primers, hair essences, and roll-on antiperspirants demand "D5+D6 blended slow-evap (lingers slightly longer than pure D5), silky no-cold-feel, pigment dispersing, D4<0.9% to approach REACH," sourcing a Hazen≤20, D5 60-70%/D6 30-40%/(D5+D6)≥97%, water≤0.025%, 190kg drum product has become the core gap for domestic DC-345-grade volatile silicone localization.
Addressing this "slow-dry silk" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Volatile Silicone Oil IOTA 345 (Cyclopentasiloxane & Cyclohexasiloxane). Characterized by "colorless transparent, Hazen≤20, D3≤0.25%, D4≤0.90%, D5 60.0-70.0%, D6 30.0-40.0%, (D5+D6)≥97.0%, water≤0.025%, fully compat. with waxes/fatty esters/mineral oil/non-vol silicone/anhydrous ethanol, 190kg/drum, ventilated cool rain-sun-proof," and backed by "D5+D6 blended slow-evap + low-D4 impurity + pigment-disperse spread," it serves as the "dual-cycle silicone anchor" for volatile carrier and pigment dispersion in skincare/makeup/haircare/antiperspirant.
Molecular Architecture: D5/D6 Blend + Low-D4 Impurity + Slow-No-Cold 3D Logic
The core competitiveness of IOTA 345 stems from its "decamethylcyclopentasiloxane (D5)-led, dodecamethylcyclohexasiloxane (D6)-auxiliary cyclic siloxane blend":
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D5+D6 Blended Slow-Evap: D5 bp ~210℃, D6 bp ~245℃; D6 larger molecule lower vapor pressure—30-40% blend extends evap window vs. pure D5, giving "fast spread first, silky dry later" on skin, no cold feel (low evap latent heat), no snap-dry, more velvet than mono-D5.
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Low-D4 Compliance Buffer: D4 (octamethylcyclotetrasiloxane) is the PBT/vPvB substance under REACH Annex XVII Entry 70 and EU cosmetic rules; IOTA 345 caps D4≤0.90%, D3≤0.25%, leaving formulator buffer—but note EU (EU) 2024/1328 mandates from 2027-06-06 leave-on cosmetics D4/D5/D6 each <0.1% (1000mg/kg); this product is high-D5/D6 feedstock, EU leave-on SKUs must switch carrier or confine to non-EU/rinse-off.
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Disperse + Full-Compat: Surface tension ~20mN/m wets TiO₂/iron oxide/mica, prevents makeup flocculation; miscible with waxes, fatty acids, esters, mineral oil, dimethicone, anhydrous ethanol; room-temp emulsifiable, no heating.
Performance Leap: From "Pure D5 Snap-Dry" to "D5/D6 Velvet Slow"
Incorporating IOTA 345 enables qualitative leaps:
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Foundation/Primer: 5-15%—pigments disperse evenly no cake, D5 spreads then D6 lingers, face-flat not stripping, low transfer in 4-8h.
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Skincare Sunscreen: 3-10% in SPF lotion/day cream—aids ZnO/TiO₂ dispersion, no white cast, no oil film, no skin temp drop.
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Hair Essence: 10-20% with light esters—post-dry slip without weigh-down, combing +30%+, no silicone buildup.
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Roll-On Antiperspirant: 20-40% as volatile carrier—smooth glide, dry non-tacky, no aluminum salt crystallization.
Application Penetration: From Primer to Roll-On
IOTA 345 covers sectors triply sensitive to "volatile carrier + silky spread + pigment disperse":
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Makeup: Foundation, BB, primer, eyeshadow, lipstick, concealer.
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Skincare: Sunscreen, day/night cream, massage cream, cleansing oil (spread aid).
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Haircare: Conditioner, hair mask, leave-in oil, styling spray.
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Body: Roll-on antiperspirant, deo spray, body lotion.
IOTA Technical Guide: Room-Mix 1-20%, EU Alert
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Addition: Use alone or pre-mix with mineral oil/iso-alkane/non-vol silicone/ethanol; recommend 1-20% (skincare 3-10%, makeup 5-15%, haircare 10-20%, antiperspirant 20-40%); room-temp emulsify, avoid prolonged >60℃ (trace ring opening).
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Pigment Wet: Premix pigment (TiO₂/oxide/mica) with IOTA 345 at pigment:oil 1:1~1:3 on 3-roll/high-shear, then merge into emulsion phase—avoid direct water-phase dump.
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Taboo Red Line: Contains D5/D6, low flash, keep from open flame; ventilated cool dry, no long-term humidity (mild acidolysis); EU leave-on SKUs subject to (EU)2024/1328 0.1% ceiling from 2027-06-06—prepare iso-dodecane/linear volatile silicone alternate; China 2026 cosmetic standard bans D4 from 2028-01-01, IOTA 345 D4≤0.9% still exceeds finished-goods risk, domestic formulas must account carry-in.
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Storage: 190kg/drum; ventilated cool, rain-sun-proof; non-water-sensitive but managed as general flammable liquid, away from heat/spark.
Industry experts note that under personal-care "oil-free silky" sensory upgrade and global cyclic-siloxane tightening (EU 2027 leave-on 0.1%, China 2028 D4 ban) dual squeeze, D5/D6 blended volatile silicones are upgrading from "generic DC-345 follower" to "controlled carrier needing impurity report + regional compliance label." IOTA 345, with its "D5+D6≥97% + D4≤0.9% + Hazen≤20 + 190kg industrial pack" hard metrics,
fills the domestic supply chain gap for DC-345-grade dual-cycle silicone in skincare/makeup/haircare carrier field, providing a mass-producible path to replace imported Dow PMX-345, Momentive VISIOLA for downstream daily-chem plants in non-EU/rinse-off/domestic-transition formulas; meanwhile reminds formulators—
it solves feel and dispersion, not the EU 2027 leave-on cliff; export SKUs must parallel-build iso-dodecane/linear volatile silicone routes. This confirms domestic volatile silicones are advancing steadily along "pure D5 → D5/D6 blend → low-cyclic-impurity + regional-alternate parallel," with growing technical say in personal-care carrier key materials.
