Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide

Name:Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide
CAS:162881-26-7
molecular formula：C₂₈H₂₉O₃P

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🔬I.Core Characteristics
Photoinitiator 819 is a high-performance radical-type II (hydrogen-scavenging) photoinitiator belonging to the acylphosphine oxide family. Its core characteristics are:

Exceptional Deep Curing Capability: Its absorption spectrum extends into the near-ultraviolet and visible light regions (maximum absorption wavelength approximately 380-420 nm), making it sensitive to long-wave ultraviolet (UVA) and certain visible light sources (e.g., LED illumination). This enables effective curing of thick coatings, colored coatings, or opaque materials.

High reactivity and curing speed: High photolysis efficiency generates highly active radicals, enabling rapid curing and enhanced production efficiency.

Low yellowing tendency: Its photolysis products exhibit light coloration, making it particularly suitable for applications demanding high color stability, such as clear coats, white coatings, or adhesives.

Superior Surface Curing Performance: Compared to common initiators like TPO, 819 demonstrates superior surface curing, effectively reducing oxygen inhibition to achieve smoother, drier surfaces.

Excellent Thermal Stability and Compatibility: Stable within formulation systems and compatible with most resins and monomers.

💡II.Primary Applications
With its outstanding deep-cure and surface-cure properties, Photoinitiator 819 is widely used in fields requiring efficient, high-quality curing:

UV-Curable Coatings:

Wood Coatings: High-gloss, high-abrasion-resistant UV topcoats for furniture, flooring, etc.

Plastic Coatings: UV coatings for plastic substrates such as phone cases, automotive interior components, cosmetic packaging, etc.

Metal Coatings:
UV clear and pigmented coatings for metal can printing and metal signage.

UV-Curable Inks:

Inkjet Printing Inks:
UV inkjet printing for billboards, glass decoration, electronics, etc., enabling rapid curing of thick ink droplets.

Screen Printing Inks:
Particularly suitable for printing thick, opaque, or dark ink layers.

UV-Curable Adhesives:

Used for electronic component encapsulation, glass/metal bonding, medical device assembly, etc., enabling rapid positioning and deep curing.

3D Printing (Photopolymerization):

Serves as a key initiator in stereolithography and digital light processing (DLP) 3D printing resin formulations, acting as a core material for achieving high-precision, rapid printing.

Composites and Electronics Industry:

Used in optical fiber coatings, printed circuit board solder mask inks, etc.

📌III. Storage Conditions

Environment: Must be stored away from light. Keep in a cool, dry, well-ventilated warehouse.

Temperature: Recommended storage temperature is below 20°C or as specified by the supplier (e.g., refrigerated at 2-8°C). High temperatures accelerate its gradual decomposition.

Packaging: Use opaque containers (e.g., aluminum foil bags, amber glass bottles, or drums lined with light-blocking film).

Isolation: Keep away from heat sources, sparks, and open flames. Store separately from oxidizers, strong acids, and strong alkalis.

Shelf Life: Typically 12-24 months under proper storage conditions. Use promptly after opening and reseal tightly.

📊 ⭐ Why Choose Us

• Reliable supply for research and commercial quantities

• Strict quality control and batch consistency

• Experience with export compliance and documentation

• Support for custom synthesis and technical consultation

📩 Contact Information

For pricing, samples, technical data, or customized specifications, please contact:

●Product Manager:Lucy Yao

Email:  lucy@coreychem.com