Crotonic acid
CAS 107-93-7
EC 203-533-9
Formula C4H6O2
MW 86.09 g/mol
Organic Acids Food & NutritionPersonal Care & Cosmetics pH Regulation & BufferingPreservation & BiocideFlavoring & Acidulant
Description
Crotonic acid (CAS 107-93-7) is a short-chain unsaturated organic acid commercially identified under the names Butenoic Acid, NSC 8751, and FEMA 3908. It carries no assigned E-code in the EU but is recognized under FEMA 3908 for flavoring applications in regulated markets.
In food and flavor formulations, crotonic acid functions as an acidulant and pH buffer, adjusting acidity through its carboxylic group to stabilize product matrices. In personal care, it acts as a skin conditioner and mild preservative, where its unsaturated structure contributes to antimicrobial activity at controlled concentrations.
Crotonic acid is supplied as white to light yellow crystalline flakes meeting FCC and food-grade specifications, with REACH compliance applicable for EU procurement. It is classified under HS code 29161940 and available in standard industrial packaging. Buyers should confirm grade suitability against applicable regional food or cosmetic regulatory frameworks before formulation.
In food and flavor formulations, crotonic acid functions as an acidulant and pH buffer, adjusting acidity through its carboxylic group to stabilize product matrices. In personal care, it acts as a skin conditioner and mild preservative, where its unsaturated structure contributes to antimicrobial activity at controlled concentrations.
Crotonic acid is supplied as white to light yellow crystalline flakes meeting FCC and food-grade specifications, with REACH compliance applicable for EU procurement. It is classified under HS code 29161940 and available in standard industrial packaging. Buyers should confirm grade suitability against applicable regional food or cosmetic regulatory frameworks before formulation.
Physical Properties
| Melting Point | 72 °C |
| Boiling Point | 185 °C |
| Density | 1.027 g/mL at 25 °C(lit.) |
| Flash Point | 190 °F |
| Appearance | White to light yellow crystalline flakes |
| Color | White to light yellow |
| Odor | at 1.00 %. milky |
| Form | Crystalline Flakes |
| Water Solubility | 94 g/L (25 ºC) |
| Vapor Pressure | 0.19 mm Hg ( 20 °C) |
| Refractive Index | 1.4228 |
| pH | 3 (10g/l, H2O, 20℃) |
| Log P | 0.85 at 25℃ |
Safety & Handling (Learn More)
Danger GHS05 GHS07 GHS06
H
H302H311H312H314H315H318H319H335
P
P260P261P262P264P270P271P280P316P317P319P321P330P363P405P501P264+P265P301+P317P302+P352P304+P340P332+P317P337+P317P361+P364P362+P364P403+P233P301+P330+P331P302+P361+P354P305+P351+P338P305+P354+P338
Trade & Regulatory
| HS Code | 29161940 |
| UN Number | 2823 |
| ADR Class | 8 |
| Packing Group | III |
| Storage Class | 8A - Combustible corrosive hazardous materials |
| WGK (Germany) | 3 |
Other Names
(E)-but-2-enoic acidBEOButenoic Acid2-BUTENOIC ACID
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Raw Materials
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