Name: Chemical Factory Supply High Quality Best Price Poly(dimethylsiloxane) CAS 9016-00-6 with good service
Brand: Wuhan Fortuna Chemical Co., Ltd.

Detailed Description

Specifications of Poly(dimethylsiloxane) CAS 9016-00-6 COA:

Items	Specifications	Results
Appearance	Colorless transparent oily liquid	Qualified
Viscosity (25℃, mm²/s)	350±20	357
Refractive Index (25℃)	1.4013～1.4053	1.4039
Flash Point (Open Cup), ℃	≥300	327
Specific Gravity at 25℃	0.965～0.973	0.970
Pour Point, ℃	-50	-50
Lead (Pb), mg/kg	≤1	Not Detected
Conclusion	The product conforms to the above specifications.

Product Name:Poly(dimethylsiloxane)

CAS:9016-00-6

MF:(C2H6OSi)n

Melting point :-35°C
form:oily liquid

color:Colorless transparent

Uses:

Item	Details
Common names	Polydimethylsiloxane, PDMS, dimethyl silicone oil, dimethicone (INCI), simethicone (activated/with silica)
CAS	63148-62-9 (polymer substance); INCI Dimethicone; E900 (food antifoam)
Structure	Linear or cyclic siloxane backbone [–Si(CH₃)₂–O–]ₙ, end-capped with trimethylsilyl (or OH/Vinyl/H for reactive grades)
Appearance	Clear, colorless, odorless liquid to semi-solid/gum (viscosity-dependent)
Density	~0.96–0.98 g/cm³
Refractive index	~1.403 (optically transparent, UV-transparent to ~280 nm)
Surface tension	~20–21 mN/m (one of the lowest of any liquid)
Viscosity range	~0.65 cSt (hexamethyldisiloxane-like) up to >10⁷ cSt gums — the single most important grading parameter
Temp window	Pour point ≈ −50 °C; flash point typically >250 °C; continuous use ~−50 to +200 °C (short-term higher)
Dielectric constant	~2.5–2.8; volume resistivity very high
Gas permeability	Very high O₂/CO₂ permeability among polymers
Solubility	Insoluble in water, methanol; soluble in aliphatic/aromatic/halogenated hydrocarbons; immiscible with most organics → forms the basis of defoaming
Storage	2 years+ in sealed original containers, dry, ambient; non-hazardous, non-corrosive

Chemically, PDMS is the archetype silicone polymer: an inorganic Si–O backbone (high bond energy, flexible, low rotation barrier) with organic methyl side groups. The Si–O bond gives thermal/oxidative stability and flexibility (Tg ≈ −123 °C); the methyl groups give hydrophobicity and low surface energy. It is made by hydrolysis/condensation of dimethyldichlorosilane (from silicon metal + methyl chloride) → cyclic DMC (D4/D5/D6) → ring-opening polymerization with end-blockers, then neutralization/stripping. Commercial forms include fluids, gums, elastomers (RTV-1/RTV-2, HCR, LSR), resins (MQ/silicone resins), emulsions, and functionalized derivatives (amino, polyether, phenyl, vinyl, hydroxyl, alkyl-modified).

2. Main uses (by volume/value)

① Personal care & cosmetics (INCI: Dimethicone, Dimethiconol) — largest value segment
Hair conditioners, serums, skin creams, sunscreens, foundations, antiperspirants, baby care: provides slip, spreadability, softness, frizz control, shine, occlusive moisturization, water resistance and "silky" after-feel; reduces whitening/stickiness of actives and UV filters. Volatile methylsiloxanes (D4/D5, D5 alternatives like C13-16 isoparaffin blends or low-viscosity dimethicone) act as fast-evaporating carriers. Headwind note: "silicone-free" claims and regulatory limits on D5 in rinse-off products are reshaping this segment.

② Antifoam / defoamer (largest industrial-volume segment)
Food processing & fermentation (E900), pulp & paper, wastewater treatment, textiles/dyeing, detergents, agrochemical formulations, oilfield, adhesives & latex paints. PDMS works because it is insoluble + ultra-low surface tension → enters and ruptures foam lamellae; usually delivered as activated silicone (PDMS + hydrophobic silica), emulsion (10–60% active), or masterbatch.

③ Silicone elastomers & rubbers

LSR/HTV (HCR): medical tubing, catheters, implants, baby nipples, kitchenware, bakeware, seals/gaskets, EV battery & electronics potting, cable insulation.
RTV-1/RTV-2 sealants & adhesives: construction glazing, automotive gasketing, electronics encapsulation, mold-making (addition-cure platinum molds).
Silicone pressure-sensitive adhesives, tapes, medical device bonding.

④ Coatings, inks & additives
Flow & leveling agents, slip/mar resistance, anti-blocking, wetting, water repellency (masonry/facade silane-siloxane water repellents), release coatings (paper/film release liners for labels & tapes), anti-graffiti, fabric & leather softeners, polishes/waxes.

⑤ Medical & pharma
Simethicone/activated dimethicone (anti-flatulence, OTC), ophthalmic lubricants, wound-care dressings & silicone gel scar sheets, implantable components, drug-eluting/device coatings, transdermal matrix adhesives, excipient/lubricant in tablet tooling, syringe barrel lubrication. Grades supported by USP-NF/EP monographs, ISO 10993 biocompatibility, USP Class VI.

⑥ Industrial specialty fluids
Heat-transfer fluids, damping & hydraulic fluids, dielectric/transformer & capacitor impregnating fluids, vacuum diffusion-pump oils, lubricants & greases (plastic/rubber-compatible, non-staining), textile lubricants, metalworking.

⑦ Microfluidics & research (PDMS as a material of construction)
Soft lithography, lab-on-a-chip, cell-culture devices, stretchable electronics, wearable sensors, optics/gradient-index elements — chosen for optical clarity, gas permeability, easy molding/curing, biocompatibility and low cost of prototyping.

⑧ Other
Agro adjuvants/spreaders, foundry binders, ceramic & additive manufacturing release, anti-static-free mold release, battery/electronics thermal interface materials (filled PDMS TIM pads/gels), 3D printing.

3. Selling points

A. Performance (why formulators specify it)

Extreme temperature stability: −50 to +200 °C usable window with minimal viscosity change; high viscosity index, low pour point — outperforms mineral/PAO oils where heat or cold is the failure mode.
Ultra-low surface tension (~20 mN/m): unmatched spreading/wetting, release, water repellency and foam control at ppm-level dosages → cost-in-use advantage.
Chemical & oxidative inertness: non-ionic, non-corrosive, odorless/tasteless, color-stable, resistant to UV/ozone (relative to organics), shear-stable, non-plasticizing to many plastics.
Breathable yet water-repellent: high O₂/CO₂ permeability + hydrophobicity = ideal for wound care, contact lenses, medical tubing, breathable waterproofing.
Biocompatibility & regulatory pedigree: long history of safe use in food (E900), cosmetics (globally listed), pharma (USP-NF/EP simethicone/dimethicone), medical devices (ISO 10993 packages available) — lowers customers' qualification risk.
Optical clarity & electrical insulation: transparent, low dielectric constant/high resistivity → optics, LEDs, potting, HV insulation.
Tunable by design: viscosity/MW, end-groups (OH, vinyl, H, amino), architecture (linear, cyclic, branched MQ resin), and functional modifications (polyether, phenyl, alkyl, amino) let one platform serve dozens of specs; crosslinkable into elastomers/gels.
Easy to dose & ship: emulsifiable into water-based systems; non-hazardous, non-volatile (high-boiling grades), ambient storage, long shelf life → lower freight/storage costs than solvents or cold-chain materials.

B. Supply-side (why buyers pick your brand)
9. Full grade ladder: 0.65 cSt → 1,000,000 cSt fluids, gums (≥95% active), MQ/silicone resins, RTV/LSR bases, 10–60% emulsions, activated antifoam concentrates, USP/EP pharma grade, cosmetic-grade (low cyclics), electronic/medical cleanroom grades.
10. Quality differentiators that matter: ultra-low cyclics (D4/D5/D6 < specified ppm), narrow MWD, low volatiles, consistent viscosity (±5%), low ash/metals (Pt, Na, Fe), controlled acid/base number, color/APHA, residual catalyst control, lot-to-lot reproducibility with CoA + GC/GPC fingerprints.
11. Regulatory/documentation pack: REACH registration, TSCA listing, FDA 21 CFR references (e.g., 172.878/178.3570 as applicable), Kosher/Halal, non-GMO, TSE/BSE-free, animal-testing-free statements, IFRA awareness, DMF support for pharma grades, ISO 9001/IATF 16949 for automotive/medical lines.
12. Technical service as a moat: defoamer formulation know-how, emulsification support, compatibility testing, on-site troubleshooting, custom viscosity/emulsion particle size, private-label blending — where margins actually live.
13. Portfolio cross-sell: sell the system — DMC/D4/D5, aminofunctional/polyether/phenyl modifiers, silicone resins, crosslinkers (Si-H, Pt catalysts), inhibitors, silanes, silicone surfactants, ready-made antifoam & release agent finished products.
14. Recurring, non-cyclical demand base: personal care + food + water treatment + healthcare + construction = diversified, repeat-order business less tied to any single capex cycle.

4. Risks worth disclosing (professional honesty)

Regulatory pressure on cyclic siloxanes: D4 is restricted under REACH; D5 limited to 0.1% in rinse-off cosmetics in the EU; D6 faces similar scrutiny. Customers increasingly demand low-cyclic / cyclic-free PDMS — make your D4/D5/D6 ppm data a selling point, not an afterthought. Environmental persistence/vPvB debates and wastewater/STP volatility mean some regions monitor siloxanes in effluent and biogas.
"Silicone-free" marketing trend: in haircare/skin care, some brands avoid silicones for claim reasons; counter-position with volatile-free, high-durability or bio-alternative-blend strategies rather than ignoring it.
Performance limits: poor adhesion to substrates without primers/plasma treatment (notably PDMS in microfluidics), low tear strength when unfilled, swelling in hydrocarbons, low tensile vs engineering plastics, can cause fish-eye/coating defects if incompatible, and can migrate/bloom at high loadings.
Feedstock & price cycle: prices track silicon metal → methyl chloride → DMC, with China DMC capacity swings creating volatility and periodic oversupply; lock in contracts and hedge with inventory planning. Also energy-intensive production → carbon-footprint questions from ESG-conscious buyers.
Handling/safety: generally low hazard, but low-viscosity grades are slippery (fall hazard), and fine silica-containing activated antifoams carry inhalation/silica considerations; avoid mixing strong oxidizers/acids/bases at high temperature (can depolymerize/back-bite to cyclics). Do not use in oxygen-rich/high-pressure systems without compatibility review.
Compliance boundary: intermediate/finished-grade claims must match the grade's actual approvals — do not extend food/medical claims from a technical-grade product.