Benzophenone (CAS 119-61-9): Technical Specifications, Applications, and Industry Insights
Table of Contents
1. Chemical Profile & Physical Properties
| Parameter | Specification |
|---|---|
| Chemical Formula | C13H10O |
| Molecular Weight | 182.22 g/mol |
| CAS Registry | 119-61-9 |
| Appearance | White crystalline solid with rosaceous odor |
| Melting Point | 47-51°C (α-form, stable) |
| Boiling Point | 305°C @ 760 mmHg |
| Density | 1.11 g/cm3 |
| Refractive Index | 1.584-1.589 |
| Flash Point | >123°C (Closed cup) |
| Solubility | Ethanol: 100 mg/mL (80%), Insoluble in water |
Crystalline Forms: Exists in α-form (stable rhombic crystals) and β-form (metastable monoclinic crystals, mp 26°C).
2. Industrial & Commercial Applications
Core Functional Uses:
- UV Technology: Primary photoinitiator in UV-curable coatings (wood finishes, paper varnishes, adhesives)
- Pharmaceuticals: Intermediate for antihistamines (Diphenhydramine HCl), anticholinergics (Benzatropine), and calcium channel blockers
- Cosmetics: UV absorber in sunscreens (290-360 nm range protection)
- Polymer Industry: Inhibitor for styrene polymerization
- Fragrance Engineering: Fixative agent enhancing sweet notes in perfumes
3. Key Performance Parameters
| Grade | USP Standard | Industrial Grade | Cosmetic Grade |
|---|---|---|---|
| Purity | >99.6% | >99% | >99.5% |
| Heavy Metals | <10 ppm | <50 ppm | <5 ppm |
| Residual Solvents | NMT 0.1% | N/A | NMT 0.05% |
| UV Absorption | – | Peak @ 340 nm | Broad-spectrum |
4. Storage & Handling Protocols
- Store in airtight containers below 30°C with desiccant
- Protect from light exposure (photosensitive material)
- Incompatible with strong oxidizers/reducing agents
- Ventilation requirements: Local exhaust to maintain <50% LEL
- Shelf life: 36 months in original packaging
5. Safety & Regulatory Compliance
| Parameter | Value |
|---|---|
| RTECS Number | DI9950000 |
| NFPA Rating | Health: 1 | Flammability: 1 | Reactivity: 0 |
| WGK Classification | 2 (Water hazard) |
| TSCA Status | Listed |
| EINECS | 204-337-6 |
First Aid Measures: Eye contact – Flush with water (15 mins). Skin contact – Wash with soap. Inhalation – Move to fresh air.
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