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CAS No.:21245-02-3
Place of Origin:China
Appearance:Pale yellow liquid
MF:C17H27NO2
Purity:99%
Certificate:COA MSDS TDS
Free Samples
2-Ethylhexyl 4-dimethylaminobenzoate—also known as Padimate O or Photoinitiator EHA—is a colorless to pale yellow, transparent liquid with a characteristic odor at room temperature. Primarily utilized as a UVB absorber, this substance is widely incorporated into sunscreen cosmetics; it effectively absorbs medium-wave ultraviolet radiation within the 280–320 nm range, thereby preventing sunburn. Furthermore, it serves as a synergist (co-initiator) for photoinitiators in industrial applications—such as UV-curable coatings, inks, and adhesives—where it significantly accelerates the photocuring reaction rate.

In the cosmetics industry, isooctyl *p*-dimethylaminobenzoate serves as a key UVB sunscreen agent, marketed under the trade name Padimate O. It effectively absorbs medium-wave ultraviolet radiation within the 280–320 nm range, thereby preventing sunburn, erythema, and skin aging.
Due to its excellent oil solubility and compatibility, it is frequently incorporated into sunscreens, lotions, creams, and hair care products. The U.S. Food and Drug Administration (FDA) has approved its use as an active ingredient in over-the-counter (OTC) sunscreen products.
In the industrial sector, this substance is commonly utilized as a synergist (co-initiator) for photoinitiators, particularly within UV-curing systems.
It functions in conjunction with thioxanthone-based (e.g., ITX) or benzophenone-based photoinitiators; by undergoing hydrogen abstraction reactions to generate free radicals, it significantly enhances the reaction rate and efficiency of photocuring processes. This characteristic has led to its widespread application in the manufacture of varnishes, coatings, inks, and adhesives intended for use on paper, wood, metal, and plastic surfaces.
Product Specifications:
| Item | Specifications | Results |
| Appearance | PALE YELLOW LIQUID | Conforms |
| PURITY (GC %) | 98.0 MIN | 99.79% |
| LOSS ON DRYING (%) | 1.0 MAX | 0.11% |
| LIGHT TRANSMITTANCE (% 1g/10ml TOLUENE)425nm500nm | 94.0 MIN | Conforms |
| 97.5 MIN | Conforms | |
| CLARITY (10% W/V IN CH3OH) | Clear | Clear |
| Conclusion | The results confir | |
Package:
1kg/25kg Bucket
Palletized Shipping
Lead Time: 1-7 Days
Shipping Methods: Sea/Air/Express delivery

