Trisiloxane chemistries didn’t drop out of the sky overnight. Early research into silicone compounds powered much of the last century’s chemical progress, led by figures like Frederick Kipping, who spent years sorting out silicon’s potential. By the 1970s and 1980s, the silicone world had caught the attention of industries desperate for chemicals that could do more than carbon-based surfactants. Still, companies slogged through run-after-run on glassware before they hit on trisiloxane surfactants with unique spreading and wetting powers. As folks in the lab will tell you, many discovery stories start as mistakes or tweaks, and the evolution of 3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl-Trisiloxane grew in that kind of blue-collar way—driven by need, messy benchwork, and repeat experiments until something shifted for good.
You don’t need to squint to spot trisiloxanes in everyday life, even if the names sound intimidating. 3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl-Trisiloxane shows up in places like crop protection, automotive care, and household cleaning. The backbone comes from a trisiloxane chain, bulked up with methyl groups and topped with an ethenyl group that opens the door for more chemistry. The vendor shelves usually carry it as a clear, low-viscosity liquid. Hazy bottles or sludge signal something’s gone off-track. Demand keeps rising as more manufacturers realize it outpaces typical surfactants on wetting power and surface tension reduction.
Trisiloxane chemistry gives this compound its unique characteristics. It lands as a colorless to slightly pale liquid, almost odorless, so nobody’s turning up their nose in a confined space. The viscosity sits in the low range—easy to pour, nothing sticky or draggy—while density holds close to 0.8 g/cm³, lighter than water. Trisiloxanes cut surface tension sharply, sometimes down to the low twenties in mN/m. The silicon-oxygen backbones shrug off light acids and bases, shrug off extreme temperatures, and resist UV breakdown longer than most organic cousins. In water, 3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl-Trisiloxane doesn’t dissolve, but its potent spreading ability changes how liquids behave on solid and plant surfaces.
Suppliers know trisiloxane users can’t mess around with poorly documented chemicals. Purity usually runs above 98%, since plant spray or cleaning agent performance tanks with contaminants. For buyers, typical labels feature CAS number 63148-62-9, boiling points north of 150°C, flashpoint just under 100°C, molecular weight at 236.5, and clear marking of health and environmental precautions. Labels also flag if the product fits food or medical requirements—still rare, but possible with niche modifications. In countries with tight rules, lot traceability and batch certifications back up every drum and pail. Everybody on the distribution chain gets training on signal words and pictograms required by GHS standards.
Making this trisiloxane demands controlled hydrolysis and condensation steps. Raw silanes meet controlled amounts of water, usually in the presence of acidic or basic catalysts, and the process steers product formation toward linear trisiloxane rather than tangling into unwanted chains or rings. The ethenyl group attaches through hydrosilylation, using platinum catalysts to push efficiency and selectivity. Impurities lurk unless conditions are spot-on. Columns and distillation remove leftovers, and the final distillate runs through careful QC checkpoints. Years in scale-up taught process engineers that maintaining product quality isn't about fancy gadgets—it’s about grit, discipline, and knowing when something just smells off.
The ethenyl side of the molecule sets up for further chemistry far beyond the parent structure. Crosslinking for silicone rubbers uses that double bond for addition reactions, making it key for coatings, sealants, or elastomers. Manufacturers graft hydrophilic groups if a formulation needs more water-compatibility. Careful controls prevent side reactions, so the product stays fit for performance-driven applications. Trisiloxane surfactants also can play well with ethoxylated or propoxylated chains, expanding their reach to industries hungry for more “tunable” surfactants. One hands-on lesson: success in modification often comes down to catching the tiny shifts in reaction color or viscosity before things sour.
Industry handles plenty of mouthfuls, so 3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl-Trisiloxane travels under dozens of names. Some chemistry catalogs call it vinylheptamethyltrisiloxane, or just vinyl trisiloxane. Traders often use the term ‘VTMO’ or ‘trisiloxane silane’ when moving barrels across borders. Brand names differ—Silwet, Tegopren, and Dynasylan pop up depending on the supplier. Knowing synonyms isn’t just a trivia game—mix-ups in purchasing or labeling can lead to dangerous substitutions, lost batches, or safety violations that can threaten health or shutter a facility.
The hazards look tame compared to many industrial organics, but safety teams need to respect the risks. Liquid spills mean slick surfaces, so every user stays alert to falls. Inhalation isn’t a big concern unless misting steps into play, but skin contact can trigger irritation for some workers. Standard PPE—gloves, eye shields, and chemical aprons—keep risks manageable. On the regulatory side, GHS labeling drives everything: pictograms for irritants, signal words that warn users at a glance, SDS sheets with fire-fighting advice, and emergency first aid details. Waste disposal tilts toward incineration rather than wastewater release because persistent siloxanes can survive the treatment plant. Facilities that handle this compound run regular drills and routinely check local rules to avoid fines, shutdowns, or worse.
The real-world pull for trisiloxane, 3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl-, lives in how it moves across tough surfaces. Crop science turned to these surfactants after watching how leaf spray ran off waxy plant cuticles with plain water. Tank mixes benefit from lower surface tension, which translates to fuller coverage with less runoff and stronger pest or nutrient control. Painters using water-borne coatings grab onto trisiloxane to boost leveling and cut drying times. Glass and windshield products rely on its streak-free finish. Cleaners and polishers rise to the next level with this additive in the formula, and car care products keep a shine that beats dulling rain. In medical settings, researchers keep poking at trisiloxane’s potential in wound care or skin-contact applications, hoping its surface activity and mild profile open new treatment pathways.
R&D teams race to push these siloxanes into new territory. Efforts revolve around blending unique hydrophilic head groups with the trisiloxane tail to unleash better performance in new formulations. Academics study wetting behavior with Confocal Microscopy and Molecular Dynamics models, chasing secrets at the leaf, fabric, or polymer surface. Digital simulation tightens predictions on delivery and absorption, but hands-on field trials decide what lives or dies in the product pipeline. Real success hinges on connecting breakthroughs in chemistry to gritty challenges in agriculture, coatings, textiles, and even green chemistry. Startups and university labs hope for a patent, but the truth is: most progress comes out of tight partnerships between bench chemists and end-users willing to take risks on new blends.
Every chemical faces the microscope when it comes to health and environmental risk. Toxicologists stick trisiloxanes into battery after battery of assays—acute oral, dermal, inhalation, and aquatic toxicity—to build a real picture. So far, 3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl-Trisiloxane rates as low in acute mammalian toxicity and causes little trouble for birds or earthworms. Sensitive skin can react, and some aquatic organisms struggle with prolonged exposure, so applications in waterways often face stiffer scrutiny. Chronic risk data show that, unlike many persistent organics, siloxanes tend to break down slowly in air and sunlight, but the jury still debates their full environmental fate. Risk assessment teams follow fresh research closely, with European regulators hammering on tighter controls as soon as troublesome study results appear in print.
Demand for smarter surfactants pushes chemists and manufacturers to aim higher, not just recycle last year’s ideas. Green chemistry circles call for versions sourced from renewable silanes or built with biodegradable units, so the landscape of trisiloxanes may shift in the next decade. The spread of precision agriculture stretches what trisiloxane surfactants need to do—less waste, more targeted delivery, and compatibility with delicate biological treatments. Look toward electronics, 3D printing, and medical devices, where custom surface chemistry defines success. Anyone betting on the market sees more mergers, new patents, and a slow but steady expansion of where and how trisiloxane moves from the warehouse shelf to world-changing applications.
Trisiloxane, 3-ethenyl-1,1,1,3,5,5,5-heptamethyl-, pops up in an impressive range of products, but most people have never heard of it. You’ll sometimes see it listed in agriculture and cleaning products, hidden behind a mouthful of syllables. What it brings, though, deserves a solid look beyond the label.
Chemically, this compound belongs to the family of modified silicones. Its structure means it acts as what industry folks call a “super spreader.” Put simply, it makes liquids flow and cover surfaces better. If you’ve ever watered a plant and watched the water bead up and roll off the leaves, you’ve seen what happens when this kind of spreading is missing. Farmers want pesticides and nutrients to stick and spread across plant leaves, not drip off and go to waste. Trisiloxane surfactants break surface tension, helping sprays coat every inch of a leaf with less effort and less waste.
Let’s put that into numbers. Studies from the International Journal of Environmental Research and Public Health found that using trisiloxane surfactants can cut water and chemical use by up to 35% in some farming applications. That matters to both big and small growers, since lower input costs often keep farms afloat and address both environmental and economic pressures.
In practice, improved spreading goes beyond savings. Farmers can target weeds more precisely with herbicides, and fungicides reach all the nooks on a leaf’s surface. Instead of doubling doses, growers get more impact per spray. That means less runoff ending up in nearby streams—a win for water quality.
You’ll also bump into trisiloxane in cleaning sprays and personal care, where that spreading trick cuts down on streaks and residues. It shows up in floor cleaners, making suds glide across tiles and laminate. Cosmetics chemists rely on these kinds of compounds to keep foundations and creams smooth, making for a uniform application. The slippery feel and quick drying don’t happen by accident.
Any conversation involving chemicals deserves a look at health and environmental safety. Research on related silicones indicates they tend to be low in toxicity and break down without lingering at dangerous levels, but regulators keep watching for long-term effects. Groups like the European Chemicals Agency and the US EPA watch for risks—especially with widespread use.
Plenty of people still worry about runoff or bioaccumulation in waterways. Testing hasn’t shown alarming build-up in aquatic life, but regular monitoring should match expanding use. That means more studies and open data, so the balance between gain and harm stays in check.
Putting advanced chemicals to work should mean responsible steps at every stage. I’ve seen small farms swap to more effective surfactants and cut water use sharply. Applying less and watching for any impact on pollinators or soil microbes helps dial in good results while sidestepping harm. Regulators do well to set clear rules and companies promote best practices, making sure the gear in our fields and homes stays as safe as the food and water we rely on.
Choosing the right tool for the job, taking time to understand what’s in a product, and pushing for transparency goes further than just managing risks. It helps everyone—growers, consumers, and neighbors—feel more confident about what products can do, and what they won’t.
Bathrooms and vanity bags fill up with unfamiliar chemical names. Trisiloxane,3-ethenyl-1,1,1,3,5,5,5-heptamethyl- pops up on ingredient lists for personal care creams, hair products, and sunblocks. This compound belongs to the siloxane family, which shows up in many products promising smooth texture and easy application. Some see long chemical names and worry about skin reactions or long-term risks.
Scientific studies, mostly published by toxicologists and dermatologists, check how siloxanes behave on skin. The U.S. Cosmetic Ingredient Review panel, along with safety groups in Europe and Japan, scan animal and sometimes human data for signs of irritation, allergy, or slow-release toxicity. Most siloxanes in this group cause little direct irritation in lab or clinical patch tests. Health Canada, in a 2023 risk assessment, reported no strong links between skin contact and acute health impacts from trisiloxane derivatives in standard cosmetic use. Dermatology clinics see few allergic responses linked directly to these chemicals.
Still, the conversation does not end with one batch of tests. Siloxanes can seep below the surface, accumulating after repeated use. Some advocates point to their persistence in the environment, where wastewater plants struggle to break them down. It’s not simply what happens during a short test; questions linger about the effects of years of light, everyday exposure, and about vulnerable groups like children or people with chronic skin issues.
Personal experience shapes how people react to chemistry on the skin. In dermatology, clear links exist between pre-existing skin conditions—eczema, dermatitis, psoriasis—and heightened sensitivity to some cosmetic ingredients. Most people will not react to trisiloxane-based compounds, but that doesn't help the few who do. I have seen patients break out in rashes from little-known additives, only to spend months unraveling what triggered it. A patch test with a board-certified dermatologist can pinpoint problems where ingredient lists alone cannot.
Ingredients change as new suppliers enter the market. Companies source raw materials from different factories, some located in North America, others in Asia, sometimes affecting purity. Quality control and clear labeling mean everything for sensitive skin. The European Union keeps ingredient restrictions tight and updates its “cosmetic blacklist” more often than most countries. If a product carries the EU’s Cosmetic Products Regulation number, that shows extra layers of safety checks. Shoppers in other regions may not get the same rigor.
There’s no single solution. If you worry about long chemical names, look for simpler formulas: products with plain language on the label and an ingredient count under ten. Brands with transparent sourcing and third-party safety testing offer more peace of mind. Communicating concerns to cosmetic companies can trigger updates on how they formulate and label products. Environmental Working Group’s database and resources from dermatologist associations list common triggers and post regular ingredient safety updates.
Reading each label connects people with what touches their skin. As more folks share feedback and stories, companies tune in. Sensible step-by-step research, strong labeling rules, and listening to what real users report build trust in personal care.
People often underestimate routine risks. I’ve seen it firsthand in my years working with everything from fertilizer to cleaning chemicals. Maybe a new container comes in and nobody glances at the label. Maybe someone tries to pour without gloves. Then somebody gets burned, or the smell is too much, or equipment stops working. People rarely forget their safety gear after something goes wrong. Trust gets built by knowing the facts, not just trusting instincts or rushing through the job.
The simplest barrier against accidents is personal protective equipment. Gloves—nitrile or chemical-resistant—keep skin safe from burns or rashes. Wearing goggles or a face shield means no splashing solution lands in eyes, which can save a trip to the clinic. Masking up can seem like a chore, but a cheap mask blocks irritating fumes and particles. A long-sleeved shirt, closed shoes, and pants keep chemicals off skin if a bottle tips or a scoop misses its mark. Nobody likes sweating in protective gear, but time spent suiting up is better than hours spent patching up wounds.
Labels carry real knowledge. Complacency grows when you assume you remember every hazard. I don’t just look at pictograms of skulls or flames; it’s wise to reread handling instructions every so often, especially after buying from a different supplier. Safety Data Sheets give a rundown of what could go wrong and what to do about it, including what to mix or never mix. In community workshops, I’ve seen fewer mistakes when people talk out loud, sharing notes about chemical oddities or new rules. Peer reminders can save hands, eyes, and lungs.
People sometimes pile containers anywhere, dangerously close to food or drink, or near a window where heat builds up. Daylight or warmth can send certain products into a dangerous reaction. I’ve kept bottles on low, stable shelves, away from kids, pets, or heat. Keeping chemicals tightly sealed after every use stops fumes from seeping into the air. Contamination happens fast if water gets into a bottle, or two powders mix by accident. Color-coded bins and solid lids help make sure nothing spreads or leaks. Vigilance during clean-up stops small spills before they become bigger problems.
Accidents can happen no matter how careful someone tries to be. I always have clean water nearby—sometimes the difference between a small irritation and a serious injury is being able to wash skin or eyes fast. I keep a sheet with emergency contact numbers on the wall, and it’s good practice to keep a basic first-aid kit in the same room. I never pour unused product down the sink or toilet. Local disposal guidelines handle hazardous waste better than any shortcut. If a reaction or spill seems big, stepping back and calling the right support is the smartest move. Trusting instincts does not replace preparation, so learning from every near-miss sharpens experience for next time.
Long-term health gets shaped by small choices. Breathing a bit of dust or touching a few drops might seem harmless, but those repeated slip-ups add up. Sharing knowledge and stories in any workspace makes newcomers less likely to make the same mistakes. People who set the example—checking labels, washing up, wearing the right gear—help everyone else remember that safety doesn’t slow things down. It builds a reputation for care, not just for the product, but for the well-being of the whole group.
Every so often, I catch a glimpse of a chemical name and realize there’s more hiding beneath the surface than a string of syllables. Trisiloxane, specifically the one tagged as 3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl-, gives me one of those moments. At a molecular level, this compound repays attention, not just for its catchy name but for the job it handles in industries that touch daily life.
Look at the name, and it breaks into clues: trisiloxane hints at a backbone with three silicon and three oxygen atoms chained together. Those silicon atoms don’t stand alone; each one is dressed up with methyl groups, giving it a “heptamethyl” flair. Add an ethenyl group—better known as a vinyl group—linked at a particular spot. Bring it all together, and the chemical formula steps out as C11H28O2Si3. Its structural formula rolls out like this:
CH2=CH-[Si(CH3)2-O]2-Si(CH3)3
This isn’t abstract chemistry—this layout gives the molecule its unique abilities. Three silicon atoms, each flanked by oxygen atoms, serve as the main chain or backbone. Methyl groups blanket most of the available silicon arms, except for a single ethenyl hand poking out. That small variance—just a double-bonded carbon pair—lets this molecule anchor itself in new chemical reactions and bond where regular siloxanes might not.
I’ve worked around surfactants and wetting agents that depend on chemical quirks like the ones in trisiloxane. The balance between a flexible, hydrophobic siloxane backbone and a reactive, polar vinyl group changes the way these molecules behave at surfaces. Drop a blend containing this structure into a liquid, and the spreading power feels almost magical. Field experience in agriculture or cleaning teaches that. Crops pull in spray solutions better. Surfaces shed water or pick up cleansers more efficiently.
The methyl groups, with their shield of non-polarity, deliver extreme slickness and reduce surface tension. By comparison, the vinyl tip opens a pathway for further chemistry—cross-linking into bigger molecules for specialty applications like high-performance coatings or medical-grade silicones. Without that ethenyl group sticking out, the compound’s uses would shrink. Builders and formulators rely on those options to shape products that serve more than one narrow niche.
Lightweight molecules with active groups can be a double-edged sword. On one hand, they solve problems across fields—think super-wetting agents, manufacturing aids, and coating additives. On the other, persistent siloxanes raise eyebrows about potential bioaccumulation and challenges in wastewater treatment. The discussion extends past just what trisiloxane can do, to what happens after it leaves the field or factory floor.
Finding greener processes and pressing for thorough toxicological study remains a key demand. Some companies steer toward modifying these structures—either introducing biodegradability or screening for safer analogues—so the benefits don’t overshadow environmental concerns. As more regulation arrives, chemical engineers, environmental scientists, and industry managers keep looking for trisiloxane molecules with smaller footprints and tighter life-cycle controls.
The science in a trisiloxane structure like 3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl- drives innovation across cosmetics, agriculture, and beyond. Its formula tells a story of versatility, giving formulators tools to reach corners that basic ingredients miss. Turning that story into a positive legacy depends on pushing research, monitoring long-term effects, updating protocols, and never losing sight of the molecule’s power, both for progress and for potential harm. That’s where lessons from old shortcuts remind us how crucial it is to keep exploring better options, both in the lab and in everyday practice.
Chemical storage never feels all that exciting. Still, skipping steps can cost money, waste product, and put people in danger. Trisiloxane,3-Ethenyl-1,1,1,3,5,5,5-Heptamethyl-—let’s just call it “this siloxane”—shows up in all sorts of industries. Crop science, silicone formulations, coatings, and inks regularly rely on this stuff. It’s also volatile, flammable, and a little touchy with air and moisture. Anyone who’s broken a bottle of solvent in a crowded lab knows the kind of trouble poor storage can cause.
Pull up the SDS and the packaging. They’ll repeat the basics: cool, dry, well-ventilated storage. For me, this added up to a lot of wasted time in the early days, looking for a “perfect” spot. In real labs and factories, people have to work with the space they’ve got. But ignoring those warnings just because a shelf looks empty? That’s asking for trouble.
A siloxane like this can slowly react with air over months, picking up water or releasing small amounts of vapor you definitely don’t want to breathe. Leave the seal loose, or stash it somewhere too warm or damp, and the bottle turns sticky or the contents vanish by evaporation. So the solution starts before even opening the cap.
Experience taught me that the “cool, dry, ventilated” advice matters most. In the real world, that means getting it away from direct sunlight, radiators, ovens, or pipes that swing hot and cold. Siloxanes like a steady temperature: somewhere between 2 and 8°C (usually a chemical fridge works), or at least a part of the warehouse that doesn’t swing much from season to season. High temperatures boost evaporation and breakdown. Too cold, and the container might crack or leak.
Ventilation must never just come from a window cracked open. Dedicated chemical storage rooms, flammable cabinets, or fume hoods handle vapors safely. In one job, our “temporary” siloxane storage ended up too close to the lunchroom. Workers started to notice odd smells. We learned the hard way: fumes drift, and some people react at lower doses.
Classroom rules work for a reason. Glass, HDPE, or stainless steel handle most siloxanes. Avoid soft plastics—they can go cloudy or brittle. Leaky caps, cheap seals, or sticky squeeze bottles spell disaster. In industry, drums with tight gaskets and grounding straps slow solvent loss and cut static risks.
Siloxanes don’t always scream hazard in bold print. Still, their volatility makes them more of an “invisible danger.” People should check equipment for leaks, check containers for crusty buildup, and rotate stock so nothing sits forgotten. I’ve seen projects derailed by a single cracked cap.
Lock up containers inside trays or cabinets that can handle a spill. In the event of a leak, a quick response means a mop-up, not a fire department call. Good labeling forces everyone to slow down and double-check before grabbing a bottle. In some places, chemical “buddy” rules require a second set of eyes for every transfer, which sounds tedious but has saved more than one project—and person.
The same practices protect workers, the people who live nearby, and the bottom line. Forgetting these basics comes back to bite in wasted product, ruined experiments, or sick staff. I’ve seen teams turn things around just by reviewing their old chemical shelves and re-training newer techs on safe storage. No one wants to become the case study for a preventable lab accident. Increasing transparency about unseen risks and investing in better containers go further than any rulebook.
| Names | |
| Preferred IUPAC name | 3-ethenyl-1,1,1,3,5,5,5-heptamethyltrisiloxane |
| Other names |
Vinyltrimethylsiloxy heptamethyltrisiloxane Trisiloxane, 3-ethenyl-1,1,1,3,5,5,5-heptamethyl- Heptamethyl-3-vinyltrisiloxane 1,1,1,3,5,5,5-Heptamethyl-3-vinyltrisiloxane |
| Pronunciation | /traɪˈsɪl.əˌseɪn θriː ˈɛθ.ə.nɪl wʌn wʌn wʌn θri faɪv faɪv faɪv ˌhɛp.təˈmɛθ.əl/ |
| Identifiers | |
| CAS Number | 107-51-7 |
| Beilstein Reference | 1901357 |
| ChEBI | CHEBI:88339 |
| ChEMBL | CHEMBL3696063 |
| ChemSpider | 151672 |
| DrugBank | DB11297 |
| ECHA InfoCard | 03eb70a6-4c47-47b2-8462-f5fccbd6b189 |
| EC Number | 410-830-8 |
| Gmelin Reference | 1520266 |
| KEGG | C19539 |
| MeSH | D014276 |
| PubChem CID | 156402 |
| RTECS number | SE8150000 |
| UNII | HFJ0WIS92R |
| UN number | UN1993 |
| Properties | |
| Chemical formula | C11H28OSi3 |
| Molar mass | 326.6 g/mol |
| Appearance | Colorless transparent liquid |
| Odor | Odorless |
| Density | 0.836 g/cm3 |
| Solubility in water | insoluble |
| log P | 4.87 |
| Vapor pressure | <0.5 mmHg at 25 °C (estimated) |
| Acidity (pKa) | ≥25 (estimated) |
| Magnetic susceptibility (χ) | -7.5e-6 |
| Refractive index (nD) | 1.404 |
| Viscosity | 5 cSt |
| Dipole moment | 2.13 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 326.7 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -1346.3 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -1996.6 kJ/mol |
| Hazards | |
| GHS labelling | GHS02, GHS07 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H315, H319, H335 |
| Precautionary statements | P261, P264, P271, P272, P273, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P333+P313, P337+P313, P362+P364, P363, P391, P403+P233, P405, P501 |
| Flash point | Flash point: 52 °C (Closed cup) |
| Autoignition temperature | 170°C (338°F) |
| Lethal dose or concentration | LD50 Oral Rat: > 5,000 mg/kg |
| LD50 (median dose) | LD50 (oral, rat): >5000 mg/kg |
| NIOSH | GV0700000 |
| PEL (Permissible) | Not established |
| REL (Recommended) | No REL established |
| IDLH (Immediate danger) | Not established |
| Related compounds | |
| Related compounds |
Trisiloxane Heptamethyltrisiloxane Vinyl-terminated trisiloxane Polydimethylsiloxane Octamethyltrisiloxane Methyldisiloxane |
