In the personal-care polyether-modified silicone (PES) spectrum, the "cyclopentasiloxane (D5) cyclic silicone" dispersing medium and the "high-MW PEG-18/PPG-18 polydimethylsiloxane" dispersed phase jointly dictate water-in-oil (W/O) emulsion clarity, co-solubility boundary of inner-phase polar actives (humectants/electrolytes) and outer-phase non-polar lipids (esters/oils), and spreadability-skin-feel of sunscreen/creams. Conventional small-molecule silicone emulsifiers (e.g., cyclopentasiloxane + steareth-2) emulsify but yield whitish, phase-separating systems; pure PES added directly to cyclic silicone shows poor compatibility and turbidity. As color cosmetics/skincare/sunscreen/antiperspirants demand "W/O formula crystal-clear, water-phase dissolves polar actives, oil-phase dissolves non-polar lipids, 4-12% low-dose stabilization," sourcing a formulation aid with INCI "Cyclopentasiloxane (and) PEG-18/PPG-18 Dimethicone," pale-white liquid, SG 0.930-0.970, viscosity 40-125cSt, solids 10-14% has become the core gap for domestic cyclic-silicone W/O emulsifier-stabilizer localization. Addressing this "silicone-water clear" pain point, Anhui Iota Silicone Oil Co., Ltd. (IOTA) officially launches Formulation Aid IOTA 99331 (Cyclopentasiloxane (and) PEG-18/PPG-18 Dimethicone). Characterized by "milky-white liquid, SG 0.930-0.970 (25℃), viscosity 40-125cSt, solids 10-14% (120℃×2h), recommended 4-12%, 20kg/200kg PE drum, non-haz, sealed room-temp 1-year shelf," and backed by "D5 cyclic carrier + high-MW polyether-silicone amphiphilic disperse + W/O clarity-stable," it serves as the "silicone-water anchor" for color cosmetic/skincare/sunscreen/antiperspirant W/O clear emulsions and polar/non-polar dual-dispersion. Molecular Architecture: D5 Carrier + Polyether-Silicone Amphiphilic + W/O Clarity 3D Logic The core competitiveness of IOTA 99331 stems from its "cyclopentasiloxane (D5) as continuous dispersing medium, suspending high-MW PEG-18/PPG-18 polydimethylsiloxane (10-14% solids)" pre-dispersed concentrate architecture:

• D5 Cyclic Carrier: Volatile cyclopentasiloxane (evaporates residue-free) gives ultra-low initial viscosity (40-125cSt) and silky spread, ideal outer phase for premium skincare/makeup/sunscreen; D5 also highly compatibilizes with most non-polar lipids (e.g., isododecane, caprylic/capric triglyceride).
• High-MW Polyether-Silicone Amphiphilic: PEG-18 (hydrophilic polyether) strongly solubilizes inner-phase water, while PPG-18 (lipophilic polyether) anchors in D5 outer phase; together they act as "bridging molecules"—non-polar raw materials dissolve in silicone outer phase, polar actives (glycerin, niacinamide, UV filters) stay in inner water phase, both phases clear and non-conflicting.
• W/O Clarity Stable: High-MW polyether-silicone pre-dispersed in D5 as nano-micelles; during emulsification forms uniform droplets (<200nm), no light scattering—system appears clear-transparent or translucent (vs. traditional W/O milky white); micelle film mechanical strength resists coalescence, no separation on long storage.

Performance Leap: From "Traditional W/O Whitish" to "Silicone-Water Clear" Incorporating IOTA 99331 enables qualitative leaps:

• W/O Foundation: 4-8% addition, water phase up to 30-40%, pigments evenly dispersed no floating, post-apply D5 evaporates leaving uniform film—long-wear non-caking; clear base easy to tint.
• Transparent Sunscreen Lotion: 6-10% addition—oil-soluble UV filters (avobenzone, octocrylene) in D5 outer phase, water-soluble antioxidant/soothing in inner phase; SPF synergy, non-greasy skin-feel.
• Moisturizing Cream: 5-12% addition—glycerin/HA/niacinamide all enter inner phase; post-D5-evaporation leaves silicone-elastomer film, long-lasting yet dry-touch.
• Antiperspirant Stick/Roll-on: 4-8%—W/O system stably encapsulates aluminum salt (e.g., aluminum chlorohydrate) aqueous solution, non-irritating, smooth glide.

Application Penetration: From Foundation to Roll-On Antiperspirant IOTA 99331 covers sectors triply sensitive to "W/O clarity + amphiphilic disperse + silicone skin-feel":

• Color Cosmetics: W/O foundation, concealer, lipstick, eyeshadow (need W/O stable carrier).
• Skincare: Moisturizing lotion/cream, anti-aging serum, niacinamide/VC-derivative carrier.
• Sunscreen: Transparent sun milk, sunscreen stick, combo-chemical sunscreen.
• Antiperspirant/Deo: Roll-on antiperspirant, solid deodorant, spray antiperspirant.

IOTA Technical Guide: Water-Into-Oil Fast-Stir, Salt-Fix Room-Temp

• Emulsification: Slowly pour water phase (with glycerin/electrolytes) into oil phase (with IOTA 99331 and lipids), fast stir (800-1200rpm) homogenize; higher shear = more stable; higher water ratio = higher viscosity.
• Stability Boost: Add 1-2% NaCl or other electrolyte to water phase to compress double-layer and lift storage stability; if no solid insoluble raw materials, emulsify at room temp (no heating), energy-saving.
• Use Note: Stir product well before use (pre-dispersion may slightly settle); homogenizer further improves particle uniformity.
• Taboo Red Line: Store moisture-proof, acid/alkali impurity-free (polyether-silicone may cleave or flocculate under strong acid/base); non-haz but D5 carrier flash ~70℃ (closed), keep from open flame; avoid direct blending with high-concentration cationic surfactants (may break emulsion).
• Storage: 20kg/200kg PE drum; sealed room temp; shelf 1 year (original), retest appearance/viscosity/solids and extend if qualified; non-haz transport.

Industry experts note that under premium makeup W/O clarification, sunscreen transparency, and skincare "silicone-dry" consumption upgrade, cyclic-silicone dedicated W/O dispersants are upgrading from "Dow Corning/Shin-Etsu import followers" to "silicone-water clear reference formulation aids." IOTA 99331, with its "cyclopentasiloxane + PEG-18/PPG-18 polyether-silicone + 10-14% solids + 4-12% low-dose instant-stable" hard metrics, fills the domestic supply chain gap for formulation aids in cyclic-silicone W/O emulsification-stabilization and dual-dispersion fields, providing a mass-producible path to replace imported Dow Corning ES-5300 series, Shin-Etsu KF-6017 series for downstream daily-chemical enterprises. This confirms domestic personal-care silicone aids are advancing steadily along "traditional emulsifier → pure PES → cyclic-silicone pre-dispersed amphiphilic," with growing technical say in W/O silicone-water key formulation materials.