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Every chemical substance tells a story about technological curiosity and demand. 2-Phenyl-2-Propanol entered the books of organic chemistry when researchers began hunting for efficient methods of introducing phenyl groups into secondary alcohols. In the hands of organic chemists, this molecule picked up a new importance as synthetic methodologies matured in the nineteenth and twentieth centuries. The structure—a benzene ring on a propanol backbone—sparked interest for both pragmatic manufacturing and more arcane laboratory pursuits. As the chemical industry expanded, so did interest in compounds like 2-Phenyl-2-Propanol—especially those with aromatic character attached to functional alcohol groups. Over the years, research moved from slow bench reactions to industrial-scale synthesis, making it more accessible for use as both reagent and intermediate, and pushing its place further into pharmaceuticals, fragrances, and advanced materials.
This molecule isn’t a household name, but its unique architecture—featuring a tertiary alcohol just off the benzene ring—makes it relevant beyond textbooks. Chemists recognize it by that strong, sweet, almost floral aroma, a byproduct of its aromatic core and alcohol group. Its solid or oily texture depends on temperature and purity. I’ve come across it in synthesis labs, where the substance handles comfortably due to its low volatility and moderate melting point. It feels a bit underappreciated, considering it can jump between being a mild solvent, an intermediate for more complex molecules, and a participant in finely-tuned reaction schemes. Its physical state, mild activeness in standard lab conditions, and compatibility with various organic solvents make it a familiar sight on a synthetic bench, even if it slips under the radar in wider circles.
Among tertiary alcohols, this compound’s crystal structure and low melting point (hovering around room temperature in many conditions) encourage straightforward storage. It dissolves in ethanol, ether, and benzene, indicating a versatile solubility profile that works in both polar and nonpolar environments. With a molecular formula of C9H12O, its structure reveals a resilience toward oxidation—especially compared to its primary and secondary cousins. In the lab, it puts up a reliable resistance to many mild oxidizing agents, making it a better choice for reactions where stability counts. I’ve watched as its aroma signals presence even before the spectra confirm identity—characteristic, unmistakable, hinting at both the benzene ring and staple organic volatiles.
People sometimes overlook the role of consistent labeling and technical data; for 2-Phenyl-2-Propanol, following the established guidance in technical datasheets isn’t just a formality—it’s an operational safeguard. Labs and factories expect a solid CAS reference, unambiguous concentration levels, and storage guidelines. In my own experience, handling relies on clear hazard indications, usually through pictograms and standardized risk codes. There’s an industry-wide respect for keeping up with labeling not just for legal compliance, but for maintaining a safety-first environment and ensuring quality between batches. The right technical standards usually outline purity (often upwards of 98%), recommended storage away from strong oxidizers, and respiratory guidance during large-scale handling. It didn’t always use to be this strict, but as regulatory frameworks matured—especially in Europe and North America—traceability became dominant. These days, non-negotiable.
Synthesis routes for this compound rely on the addition of phenyl groups to suitable propanol derivatives. In many labs, the Friedel–Crafts alkylation method rises to the surface as an efficient way—reacting cumene or its variants with water in acidic media. This approach offers reliable yields and allows easy purification thanks to the physical properties of the resulting alcohol. Chemists have tinkered with catalytic hydrogenation, hydration of alkenes, and variations using new catalysts to boost eco-friendliness and decrease the environmental impact. The shift toward greener synthesis hasn’t escaped notice, and the industry now leans more on recyclable catalysts and benign solvents. People in research remember the fussier days with harsher acids and risky byproducts, but recent years point toward more sustainable lab work without huge sacrifices in quantity or quality.
2-Phenyl-2-Propanol doesn’t take a back seat in chemical playbooks. Chemists prize its tertiary alcohol, which resists most gentle oxidations but can form intriguing byproducts with stronger reagents. I’ve watched it participate in dehydration—yielding styrene derivatives—demonstrating a knack for turning into more valuable feedstocks. It heads for esterification in the presence of acid chlorides, expanding its reach into polymer precursors or fragrance chemicals. Under strong acids, it sheds water and turns into a stable carbocation, offering an entry point for nucleophiles looking for that benzyl position. I've seen its methyl and phenyl group arrangements help as probes in mechanistic studies; that stability and reactivity in one package is prized in both classrooms and research.
In the chemical world, names swap like shoes: 2-Phenyl-2-Propanol, Benzyl methyl carbinol, Dimethyl phenyl carbinol—each points back to the same molecule. Trade names rarely pop up for this, unlike some more famous chemicals, so the IUPAC name usually holds sway. Getting the right synonym sometimes makes the difference between a successful order and a wasted week. Grappling with multi-lingual safety sheets or cross-border ordering, chemists learn quickly to check CAS numbers and alternate monikers in catalogues. This quest for clarity in naming echoes the ongoing efforts to tighten up scientific communication, making sure that what arrives on the loading dock is what the chemist intended.
Day-to-day safety for 2-Phenyl-2-Propanol stays relatively manageable, but no laboratory or factory line ignores the risks. Proof gloves and goggles are non-negotiables when handling concentrated material. Accidental inhalation or prolonged skin contact gets flagged by occupational health staff, especially in higher-volume settings. Modern Material Safety Data Sheets carry clear warnings about storage away from oxidizers and heat. Flammability is mild compared to solvents like ether, but enough to demand no open flames in the vicinity. Some facilities layer on ventilation or local extraction for bigger runs, ensuring air quality and reducing splash risks. Each accident prevention plan factors in the alcohol group—for both reactivity and routes of exposure. My early days in the lab left me cautious, respecting even seemingly 'safe' chemicals as repeated exposure sneaks up faster than you’d expect.
This compound keeps popping up anywhere chemical synthesis relies on sturdy intermediates. Drug manufacturers turn to it as a stepping stone in analgesic production, taking advantage of its stability and reactivity. Cosmeceutical enterprises sprinkle it into fragrance formulation, since its odour serves as both enhancer and stabilizer. Materials chemists rely on its ability to merge into polymers or specialty resins, aiming for products with distinct hardness or flexibility demands. Analytical labs see it as a tool for standards when calibrating instruments, riding on its purity and straightforward detection profile. In synthetic research, I’ve seen it play decoy and scaffold, propping up larger, chiral targets or acting as a mimic in structure–activity relationship studies. The real measure of this molecule lives in its adaptability—rising to each role as process, regulation, and creativity steer the field.
Scientists still find reasons to return to this dependable guest star. Teams in the green chemistry realm target new prep methods that skip hazardous acids and produce smaller waste streams. Pharmacologists dig into its metabolic fate, seeking reassurance or caution for wider pharmaceutical adoption. Analysts in environmental science keep one eye on its breakdown products, sifting for persistent residues. Young chemists in graduate school often start with 'simple' organic alcohols like this one—building techniques in spectroscopy, chromatography, and synthetic scaling before moving up to the heavy hitters. 2-Phenyl-2-Propanol proves a regular feature in academic literature tracking the hunt for more efficient catalysts or greener solvents. Its track record as a robust, easily modified tertiary alcohol keeps it in the running for advanced functionalizations, new materials, and sometimes as a benchmark in kinetic studies.
No discussion of a synthetic intermediate is honest without facing its health profile. Research into the toxicity of 2-Phenyl-2-Propanol hasn’t turned up widespread concern at low exposures, but large doses—especially if handled carelessly—can bring central nervous system effects or mild skin irritation. Regulatory agencies in the US, EU, and Asia classify it as an irritant, and updated publications track cases where inhalation or accidental ingestion have led to acute symptoms. Chronic exposure studies are less common, but industrial safety officers err on the side of caution, recommending frequent air quality checks and ready access to wash stations. Toxicologists use animal models to probe its metabolism, uncovering a likely path similar to other aromatic alcohols, mostly breaking down in the liver and exiting through urine. Science, though, still leaves some questions open as new applications emerge, and safety committees push for regular reviews as its industrial footprint grows.
2-Phenyl-2-Propanol looks set for a long tenure wherever chemistry pushes at the boundaries of synthesis and application. The industry trend points toward greener syntheses, better waste management, and more transparency in safety reporting. New hybrid materials and advanced pharmaceuticals may tap deeper into its potential as an intermediate. Researchers work on cost-effective preparation, often pursuing automation to smooth scaling hiccups. Its sheer reliability, manageable hazard profile, and the chance to bolt on all manner of chemical groups ensure it retains a quiet but influential seat at the innovation table. Both seasoned professionals and new students keep coming back to this compound, not for hype, but for what it quietly delivers: solid chemistry, dependable results, and room for invention.
2-Phenyl-2-Propanol isn’t a household name, but it quietly plays a part in things we see and use. I’ve spent years studying the stories behind synthetic chemicals and how they touch everyday products, and this compound shows up more than people expect. Its uses reach beyond labs and textbooks, branching into medicine, cosmetics, and industrial processes.
In the world of medicine, 2-Phenyl-2-Propanol acts as a building block. Drug manufacturers use it to produce key active ingredients, leveraging its structure to help form analgesics and other drugs. This step reduces the risk of unwanted byproducts, which tightens up safety standards and improves quality. Industry reports back this trend. The World Health Organization points to effective synthesis sources as a major factor in lowering costs and improving access, and 2-Phenyl-2-Propanol delivers on both counts. Anyone who has filled a prescription has probably benefitted from its role in the supply chain.
Think about the last time you tried a new perfume or lotion. There’s a good chance the lab behind the product used 2-Phenyl-2-Propanol. It brings a subtle floral note and can smooth out rough edges in complex fragrance blends. Cosmetic chemists like its mild scent and stability, which means the finished product resists spoilage and keeps its fragrance longer. This isn’t speculation. A publication from the International Fragrance Association lists it as a common intermediate. Reliable ingredients build consumer trust, and this compound keeps many brands consistent year after year.
Beyond perfumes and pills, manufacturers use 2-Phenyl-2-Propanol in chemical syntheses. Its hydroxyl group gives it flexibility for further reactions, which helps create resins, plastics, and specialty solvents. A facility manager shared with me that their resin batches mix better and stay more stable thanks to its properties. These stories surface again and again across different parts of the chemical industry.
Some concerns follow frequent production and handling of chemicals like this. Workplace safety becomes a real challenge where storage and ventilation lag behind standards. I’ve heard from plant operators about the headaches that come with spills or exposure, even if 2-Phenyl-2-Propanol is less hazardous than many of its peers. Well-trained staff and straightforward safety protocols go a long way, and I’ve seen companies cut incidents nearly in half by updating training and monitoring air quality. In my work, I’ve advocated for periodic reviews and better emergency gear in high-volume plants.
New uses for 2-Phenyl-2-Propanol pop up because researchers keep finding clever ways to adapt its structure. Environmental agencies like the EPA keep a close eye on residues as our understanding of chemical safety changes. Sustainable sourcing and greener disposal options have moved up the priority list. Responsible manufacturers test for impurities and check their impact on both people and the environment, which helps set a higher bar for everyone involved.
The story of 2-Phenyl-2-Propanol deserves attention not because it grabs headlines, but because its uses sit quietly behind products that shape daily life. Its story speaks to the bigger picture—smart chemistry, safety, and practical solutions for a better future.
2-Phenyl-2-propanol. The name tells you a good deal if you know your way around organic chemistry. This compound carries the formula C9H12O. That’s nine carbons, twelve hydrogens, and a single oxygen atom—a detail that might seem simple but packs a much bigger punch in the chemistry lab and industry.
People might see a chemical formula and switch off, but understanding the structure of a molecule like this puts power in your hands. 2-Phenyl-2-propanol features a phenyl group (the benzene ring), which pops up across the pharmaceutical industry. Whether someone is working with over-the-counter painkillers or intermediates for more complex molecules, this backbone plays a role again and again.
Having spent plenty of hours with glassware and reagents, I’ve found that compounds with straightforward formulas can trip you up. One oxygen atom. That changes everything: instead of a hydrocarbon, you’re handling an alcohol, and suddenly new reactions open up. That’s especially true with this molecule, since its structure lets it act as both a building block and a functional ingredient.
This alcohol isn’t famous the way ethanol is, but talk to a synthetic chemist and you’ll see respect in their eyes. C9H12O works as an intermediate; it helps chemists build more complex drugs, fragrances, and polymers. If anyone doubts the real-world impact, take a look at how anti-inflammatory drugs come together. Materials like 2-Phenyl-2-propanol aren’t just stepping stones—they’re the carvings on the path.
In my work with students and junior researchers, we focus less on memorizing the formula and more on seeing the “why.” Why does it matter that there’s a phenyl ring? Why does one extra methyl group bring new properties? The formula C9H12O isn’t just a set of letters and numbers. It tells us how the molecule reacts, what functional groups drive its reactivity, and what health or environmental safety factors to consider during its synthesis and handling.
Chemicals like 2-Phenyl-2-propanol deserve careful attention. Knowing the formula is just the first step. Handling calls for gloves and proper ventilation because even simple alcohols can irritate the skin or eyes. Disposal means following regulations instead of pouring leftovers down the drain. I’ve seen good intentions turn messy due to impatience around safety. Accurate labeling, safe storage, and respect for the toxicology data matter as much as nailing the synthesis.
Since C9H12O serves as a building block, it ends up in products people use every day—creams, pills, coatings. Missteps during production or disposal can land in our water or air. Science education can bridge the gap here. We need more hands-on training and real talk about environmental impact in classrooms and labs.
If you’re an entrepreneur in fine chemicals, understanding 2-Phenyl-2-propanol’s place in synthesis opens a door to niche markets. Small tweaks in structure mean new patents and new possibilities. Green chemistry techniques—like catalytic hydrogenation using less hazardous ingredients—should get more spotlight. Scaling up responsibly demands investment in both research and skilled labor.
C9H12O: simple on paper, but not so simple when you dig in. Every lab bench and production floor should approach it with curiosity, discipline, and vision for safer, smarter chemistry.
2-Phenyl-2-propanol appears in several industries, mainly as an intermediate in synthesizing pharmaceuticals and fragrances. In chemistry labs, curiosity always circles around chemicals that seem familiar but bring up concerns about hazards. I’ve seen colleagues spill a drop and quickly reach for gloves, even with substances that sound mild. Safety culture matters for every compound, popular or obscure.
Anyone handling chemicals quickly learns that something doesn’t need to be deadly to cause harm. On paper, this compound comes off as low-risk, with studies often calling it slightly irritating rather than toxic. A little digging in research databases shows that the acute toxicity sits on the lower end; for lab rats, high doses had to be used before problems started. We’re talking about doses much higher than what would come from casual skin contact or inhaling a whiff. In real lab work, none of the regulars went home complaining of headaches or nausea after using it in normal quantities.
Skin or eye irritation seems to be the most common complaint. Direct splashes sometimes sting and leave redness, so gloves and goggles become standard practice. I remember a case where a colleague cleaned up a small bench spill of 2-Phenyl-2-propanol with bare hands, thinking it harmless, then realized the skin felt itchy for hours. Those stories stick. Lab guidelines, for good reason, list it as an irritant and call for protective gear. No point taking chances and hoping for perfect luck each time.
Inhalation gets less attention with 2-Phenyl-2-propanol, probably because it doesn’t vaporize much at room temperature. Accidental spills don’t fill up a room with fumes, nothing like certain solvents that have people scrambling to open windows. Still, in any facility using bigger quantities or working with heat, fume hoods make the best insurance. In hot environments, even a low vapor pressure chemical can add up to something significant.
Beyond the immediate effects, long-term risks tend to matter more to workers and communities. Nobody wants to bring problems home after years on the job. As far as published evidence goes, nobody has linked 2-Phenyl-2-propanol to cancer or reproductive harm, at least not in animal models or human case studies. The EPA and European agencies label it as “not classifiable” for such severe risks. Its fate in the environment, studied by environmental chemists, suggests it doesn’t build up in living things—the structure makes it break down fairly quickly when exposed to sunlight and microbes.
There’s a place for caution, especially for those mixing or processing batches every day. Standard hazard communication, clear labeling, and regular training sessions create a safer space for everyone, from new hires to old hands. Clearest lesson from experience: respect the safety sheets and don’t let convenience override routine checks. Regular reviews of gloves, eyewash stations, and disposal bins make practical barriers against mishaps. Anyone who has handled caustics or solvents before knows that moments of carelessness do the most harm, not always the most potent chemicals.
Shifting to safer practices pays off. Storage away from incompatible substances, clear clean-up plans, and encouraging a questioning mindset—these steps keep minor incidents from turning into stories for industry safety bulletins. Anyone developing new processes or training staff can push for digital reminders and open-door reporting of near-misses. In the bigger picture, picking chemicals with proven, lower risks from the start makes life easier for everyone on the floor.
2-Phenyl-2-propanol doesn’t haunt the safety records like some other substances. It still deserves respect and careful handling, just like any chemical brought into a lab or plant. That’s the best way—based on years of practical experience and settled science—to keep even “mild” chemicals in their place and out of trouble.
2-Phenyl-2-Propanol plays a role across research, manufacturing, and formulation labs. It’s far more than a name on a bottle; it sits on shelves right next to people trying to get their experiments to work or to deliver products that customers trust. The right storage habits bring peace of mind. But careless storage puts health and results on the line.
I remember my first job in an organic chemistry lab. We left a jug of 2-Phenyl-2-Propanol on a crowded shelf, forgetting to replace the cap. The next week, a sharp smell hit us before we even got near the bench. Volatile organics like this compound don’t just evaporate silently. Fumes collect. Skin contact and inhalation risks tick up. A poorly closed container attracts dust and moisture, plus risks accidental spills. Lesson learned the hard way: common sense trumps hurry.
Stash this chemical in a cool, dry place, away from heat sources. Think bottom shelf of a dedicated cabinet, not next to the radiator or in direct sunlight. Fluctuating temperatures mess with product quality. Warm air boosts vapor, and if the bottle sweats, purity slips fast. Water, even small amounts from humid air, turns a good sample into a questionable one.
Sunlight holds its own dangers. UV rays sometimes trigger slow chemical changes. The stuff left uncovered turns yellow and starts to smell off. If you need proof, just check the difference between a freshly opened reagent and one that’s sat out too long. Discoloration tells you impurities are creeping in.
Use glass bottles with tight seals. Avoid using plastics since some can leach or get brittle, adding particles you don’t want. Make sure the cap closes tight every single time. I always give a quick check by turning the bottle upside down above a paper towel—no leaks means you’re good to go.
Don’t let anonymous jars collect. Every container deserves a clean label with the date and contents. In my experience, mystery bottles spark the wrong kind of surprise. The best labs rotate their oldest stock forward, just like a grocery store, so the freshest supply goes in the back. If a bottle’s been opened for months, it’s time to replace it. Rancid or cloudy samples create headaches down the line, whether for reaction setups or safety audits.
Keep storage areas ventilated. Even a slow leak builds up fumes if cupboards stay shut tight. Open the cabinet, take a sniff—traces of aroma mean it’s time to check seals and reorganize. I once worked in a windowless storeroom that doubled as a chemical closet. After one summer, headaches and watery eyes reminded us: cramped, unventilated spaces are no place for organics.
Gloves, goggles, and lab coats aren’t just for show. Splashing a bit of this on your skin may not burn, but repeated exposure dries skin and introduces unnecessary risks. Dispose of old samples according to local law. Pouring down the drain belongs in the past, not in a responsible lab.
Safe storage for 2-Phenyl-2-Propanol isn’t about jumping through hoops. It’s the cornerstone of personal safety, solid results, and smooth workdays. Store it like you’ll have to answer for every decision—because, someday, you probably will.
2-Phenyl-2-propanol brings a solid form to the table, usually as crystalline flakes or fine powder. Most who’ve handled it will remember the faint, slightly floral scent, which can linger in a workspace. There’s no mistaking its white color, and at room temperature, it holds its form until a little warmth changes things up. Expect it to melt around 57 to 59 degrees Celsius, so it will transition from solid to liquid with mild heating.
Pour some of it into water and the mix stays a bit cloudy. This substance doesn’t dissolve easily in water, yet throw it into ethanol or ether and it blends right in. Labs and chemical plants count on that trait for certain reactions or purifications. The low solubility in water means spills stay on surfaces or containers; clean-up crews don’t spend as much time chasing vapor or dissolved trails.
At about 1.02 grams per cubic centimeter, it’s just a touch heavier than water. Once bottled and sealed, the substance rests stable. Keep it out of strong acids or oxidizers—those conditions could cause it to react, changing its structure or sending unwanted byproducts into the air. I learned early to check that containers stayed tightly closed. Left open, it might pick up dust or moisture and slowly clump together.
Here’s a key point: it stays solid until it passes the mid-50s Celsius, only then melting. Boil it and the reading climbs up above 215 degrees Celsius. It rarely drifts into the air at room temperatures, with a low vapor pressure. I’ve worked in labs where we barely smelled it in the air, even with open samples on the bench. This matters for worker safety, since inhalation stays less of a risk compared to lighter, more volatile compounds.
Pharmaceutical companies find these physical features useful. That slow-to-dissolve nature in water gives it staying power during synthesis. Perfume mixers lean on its gentle scent and stability to craft new fragrances. As a personal story, I once watched a team struggle with a water-soluble byproduct—they switched to 2-phenyl-2-propanol, which held its shape and purity during processing, saving hours of time.
Cold weather transport doesn’t turn it brittle or break packs apart, and its low vapor pressure cuts losses during storage. Some chemicals demand airtight rooms or heavy ventilation, but this one offers a little more peace of mind, especially in tight, crowded workspaces.
No property matters without a close look at safety. The color and powdery texture sometimes lure the eye to think it’s harmless, yet skin exposure can cause minor irritation. Once, during a rushed batch process, a gloved hand brushed a bench and left powder behind; a quick wash took care of the irritation, but it stayed a reminder not to take shortcuts. With routine hygiene and decent gloves, it’s easily managed.
Those physical traits—low volatility, mild scent, poor water solubility—help companies plan better storerooms and safer workflows. In places where flammable vapor presents a danger, having a solid performer like 2-phenyl-2-propanol lightens the worry. Even in settings where dozens of chemicals stack up, this one lets workers focus energy on more volatile risks.
| Names | |
| Preferred IUPAC name | 2-phenylpropan-2-ol |
| Other names |
Benzenemethanol, α,α-dimethyl- Dimethylphenylcarbinol 2-Phenylpropan-2-ol α,α-Dimethylbenzyl alcohol Benzene, (1-hydroxy-1-methylethyl)- 2-Phenyl-2-propanol Dimethylphenylmethanol |
| Pronunciation | /tuː-ˈfiːnɪl-tuː-ˈprəʊpən-ɒl/ |
| Identifiers | |
| CAS Number | 617-94-7 |
| Beilstein Reference | 1057993 |
| ChEBI | CHEBI:64009 |
| ChEMBL | CHEMBL440471 |
| ChemSpider | 14116 |
| DrugBank | DB14163 |
| ECHA InfoCard | 210-323-0 |
| EC Number | 201-993-5 |
| Gmelin Reference | 82277 |
| KEGG | C02422 |
| MeSH | D011973 |
| PubChem CID | 69711 |
| RTECS number | SZ6475000 |
| UNII | O5G8JBB11K |
| UN number | UN1993 |
| Properties | |
| Chemical formula | C9H12O |
| Molar mass | 136.19 g/mol |
| Appearance | Colorless liquid |
| Odor | mild floral |
| Density | 0.983 g/mL at 25 °C(lit.) |
| Solubility in water | slightly soluble |
| log P | 1.7 |
| Vapor pressure | 0.02 mmHg (25°C) |
| Acidity (pKa) | 19.2 |
| Basicity (pKb) | 15.1 |
| Magnetic susceptibility (χ) | -62.2×10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.525 |
| Viscosity | 2.20 cP (20°C) |
| Dipole moment | 1.398 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 331.6 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -198.7 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -3614 kJ/mol |
| Pharmacology | |
| ATC code | D01AE15 |
| Hazards | |
| Main hazards | Harmful if swallowed. Causes serious eye irritation. Causes skin irritation. |
| GHS labelling | GHS02, GHS07 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H315, H319 |
| Precautionary statements | P264, P270, P305+P351+P338, P337+P313 |
| NFPA 704 (fire diamond) | 1,2,0 |
| Flash point | 79 °C (174 °F; 352 K) |
| Autoignition temperature | 745°F (396°C) |
| Lethal dose or concentration | LD50 rat oral 1620 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral rat LD50 = 1620 mg/kg |
| NIOSH | SN4300000 |
| PEL (Permissible) | Not established |
| REL (Recommended) | No REL established |
| IDLH (Immediate danger) | Not listed |
