Photoinitiator 651 is a widely used Type I radical UV photoinitiatordesigned for fast curing of acrylate-based systems.
It is commonly searched as Irgacure 651 or Omnirad 651 in global markets.
Photoinitiator 651 is an efficient free radical photoinitiator, featuring good compatibility, low volatility, good dispersion, low migration, excellent thermal stability, and high curing efficiency. When used in combination with photoinitiator ITX and photoinitiator 907, it enhances the light absorption performance and improves the curing efficiency. It is suitable for unsaturated polyester, acrylate, styrene, silicone oxide system, varnish, ink, coating, adhesive. The general dosage is 1-5%.
It is especially suitable for systems requiring:
- Fast surface curing
- Reliable UV response
- Compatibility with acrylates
Applications of Photoinitiator 651
- UV Coatings - Used in wood coatings, plastic coatings, and industrial finishes.
- 2. Printing Inks - Suitable for UV inks, varnishes, and packaging applications.
- 3. Adhesives - Used in UV-curable adhesive formulations.
- 4. Photoresists & Plates - Applied in printing plates and electronic materials.
Why Choose Photoinitiator 651?
- Cost-effective general-purpose photoinitiator
- Widely available and globally recognized
- Stable performance in standard UV systems
- Easy formulation compatibility
Photoinitiator 651 vs Other Photoinitiators
Compared with newer photoinitiators, 651 is more economical but may show higher yellowing.
It is typically selected when cost-performance balance is important.
Technical Specifications
- CAS No.:24650-42-8
- Chemical Name:Benzoin dimethyl ether
- Molecular Formula:C16H16O3
- Molecular Weight:256.3
- Other Name:Irgacure 651,Omnirad 651
- Appearance: Light yellow powder
Melting Point | 63-67℃ |
Purity | ≥99% |
Loss On Drying | ≤0.2% |
Density | 1.13g/cm3 |
Flash point | 169.6℃ |
Absorption wavelength | 220nm,255nm,325nm |
Package:
25KG cartons
Storage and Transportation:
- Keep container tightly closed and dry and storage in cool place.
- Attention should be paid to avoiding light during production, manufacturing, storage and transportation.
Is Photoinitiator 651 the same as Irgacure 651?
Yes, they refer to the same chemical substance.
Does Photoinitiator 651 cause yellowing?
Yes, slight yellowing may occur compared to advanced photoinitiators.
What is the main use of Photoinitiator 651?
UV curing coatings, inks, adhesives, and printing plates.
What is the recommended dosage for using Irgacure 651?
Typically 1–5%, depending on formulation.
