Overview
2-Phenylphenol (CAS 90-43-7 ), also known as OPP, Torsite, and Rotoline, is a broad-spectrum antimicrobial active used across food contact, agricultural, and industrial preservation applications.
It functions primarily as a biocide and fungicide, controlling microbial and fungal growth on surfaces, produce, and in formulated products. In post-harvest agriculture, it is applied as a surface treatment.
This treatment is used on citrus, pears, and other fresh produce to suppress mold and extend shelf life during storage and transit. Pharmaceutical manufacturers use it as an intermediate in synthesizing active compounds.
It also serves as a preservative component in topical and veterinary formulations. Personal care formulators incorporate it into disinfectant soaps, surface sanitizers, and cosmetic preservative systems.
In flavor and fragrance applications, it contributes a faint phenolic note and is recognized under FEMA 3959 for use in approved flavoring contexts. It is supplied as a white crystalline powder.
Technical and food-grade specifications are the most commonly available, with material sourced to meet regulatory requirements for food contact and agricultural use in relevant markets.
Purity grades typically range from 98% to 99%+, with documentation available to support compliance in regulated end-use categories. It meets various global standards for industrial and chemical safety.
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Physical Properties
| Melting Point | 59 °C |
| Boiling Point | 286 °C |
| Density | 1.213 g/cm³ @ Temp: 25 °C |
| Flash Point | 255 °F |
| Appearance | o-Phenylphenol is a white to buff-colored crystalline solid. |
| Color | White |
| Odor | nearly wh. or lt. buff crystals, mild char. sweetish odor |
| Form | Crystalline Flakes |
| Water Solubility | 0.7 g/L (20 ºC) |
| Vapor Pressure | 7 mm Hg ( 140 °C) |
| Refractive Index | 1.6188 (estimate) |
| pH | 7 (0.1g/l, H2O, 20℃) |
| Log P | 3.18 at 22.5℃ |
Safety & Handling
Danger GHS05 GHS07 GHS08 GHS09 Hazard Statements H314 Causes severe skin burns and eye damage H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H319 Causes serious eye irritation H335 May cause respiratory irritation H341 Suspected of causing genetic defects H350 May cause cancer H351 Suspected of causing cancer H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P363 Wash contaminated clothing before reuse. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P301+P330+P331 Rinse mouth. Do NOT induce vomiting. P302+P361+P354 IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29071900 |
| UN Number | 3077 |
| ADR Class | 9 |
| Packing Group | III |
| WGK (Germany) | 2 |
Other Names
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Chemical Properties
- CAS Number
- 90-43-7
- EC Number
- 201-993-5
- Mol. Weight
- 170.21
- HS Code
- 29071900
- Category
- Flavors & Fragrances