Photoinitiator TPO


Product Name:Photoinitiator TPO
CAS No.:75980-60-8
EINECS No.:278-355-8
Appearance: Pale yellow powder


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The photoinitiator TPO is an efficient cleavage free radical photoinitiator with a very wide absorption wavelength range, taking into account both surface drying and deep curing, and is used to initiate the UV polymerization reaction of the unsaturated prepolymerization system.

Item Specification
melting point 88-92 °C(lit.)
boiling point 519.6±60.0 °C(Predicted)
Flash point >230 °F
Ash ≤0.1%
Acidity value ≤0.5mgKOH/g
425nm ≧85%
500nm ≧95%
Storage Store in a cool dry place and prevent from light.



It can be used for uv curing coatings, silk screen printing inks, lithographic printing inks, flexo printing inks, wood coatings, printing inks, uv curing adhesives, optical fiber coatings, etc.




Photoinitiators are compounds that initiate or promote the photopolymerization process when exposed to light. They are widely used in various industries and applications. Here are some common applications of photoinitiators:

01. UV Curing

Photoinitiators initiate the rapid curing of UV-curable resins, inks, coatings, adhesives, and varnishes upon exposure to UV light.

02. 3D Printing

Photoinitiators enable the layer-by-layer solidification of UV-curable resins in stereolithography and digital light processing 3D printers.

03. Wood Coatings

Photoinitiators facilitate the quick curing of UV-curable coatings, providing high gloss and chemical resistance in wood finishing.

04. Graphic Arts

Photoinitiators are essential in UV-curable inks for fast curing, durable prints in flexography, screen printing, and digital printing.

05. Electronics

UV-curable adhesives, coatings, and encapsulants with photoinitiators enhance bonding and protection in electronics assembly.

06. Dental Materials

Photoinitiators enable efficient curing of UV-curable dental composites, adhesives, and sealants, aiding in dental restorations.

It’s important to note that different photoinitiators may have specific applications and compatibility requirements. The selection of the appropriate photoinitiator depends on factors such as the resin system, light source, curing speed, and desired properties of the cured material. Consultation with us to ensure optimal results for your specific application.

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WAP Chemical


2 Years




TT, L/C, Western Union

Lead time

7-15 Days


Can Be Negotiated

Full Advanced Automated Production

01. Quality Assurance

At WPA Chemical, we prioritize safety and adhere to strict quality standards in the production of food additives. Trust us to deliver products that meet and exceed industry regulations.

02. Extensive Product Range

With a wide variety of food additives, we offer a comprehensive selection to cater to diverse needs. From preservatives to flavor enhancers, we have the perfect solution for every culinary requirement.

03. Rigorous Testing Procedures

Our products undergo rigorous testing and analysis to ensure their efficacy and safety. Count on WPA Chemical to provide food additives that have been thoroughly examined and approved for consumption.

04. Industry Expertise

With years of experience in the food additive industry, we have developed a deep understanding of market trends and customer demands. Rely on our expertise to provide you with the finest quality additives.

05. Sustainable Solutions

We are committed to sustainable manufacturing practices. Our food additives are produced using environmentally friendly processes, reducing our carbon footprint while delivering exceptional results.

06. Customer Satisfaction

We prioritize customer satisfaction and aim to build long-lasting relationships. Experience our prompt service, reliable delivery, and personalized support, ensuring your needs are met with utmost professionalism.

Photoinitiator FAQ

What is a photoinitiator?

A photoinitiator is a chemical compound that initiates a chemical reaction, typically polymerization, when exposed to light. It absorbs the energy from the light and transfers it to a reactive species, which then starts the desired reaction.

What are photoinitiators used for?

Photoinitiators are primarily used in UV curing processes. UV curing is a technique in which a photopolymerizable material, such as a coating, adhesive, or ink, is exposed to UV light, and the photoinitiator initiates the curing or hardening process. Photoinitiators are also used in other applications, such as 3D printing, lithography, and dental materials.

What are the different types of photoinitiators?

There are several types of photoinitiators, including:

  1. Free Radical Photoinitiators: These generate free radicals upon light exposure, which initiate polymerization reactions. Examples include benzoin, benzoin methyl ether, and benzoin ethyl ether.
  2. Cationic Photoinitiators: These generate cations (positively charged species) upon light exposure, which initiate polymerization reactions. Examples include diaryliodonium salts and triarylsulfonium salts.
  3. Type I Photoinitiators: These directly undergo photolysis or decomposition upon light exposure, generating reactive species. Examples include benzoin and benzoin methyl ether.
  4. Type II Photoinitiators: These absorb light energy and transfer it to a co-initiator or a monomer, which then generates reactive species. Examples include benzoin ethers and benzophenone derivatives.
Are there any safety considerations when working with photoinitiators?

Yes, it’s important to follow appropriate safety precautions when handling photoinitiators. Some photoinitiators may be toxic, irritants, or sensitisers. It is recommended to use personal protective equipment (PPE) such as gloves, goggles, and lab coats when working with photoinitiators. Additionally, proper ventilation should be maintained in the work area.

Can I mix different photoinitiators?

Yes, it is possible to mix different photoinitiators to achieve desired curing characteristics or to fine-tune the curing process. However, it is important to consider the compatibility and reactivity of the photoinitiators and ensure that they do not adversely affect each other’s performance.

Can I get custom formulations from a photoinitiator manufacturer?

Yes, WPA offer custom formulation services. We can work with you to develop and produce photoinitiators tailored to your specific requirements, such as specific reactivity, absorption spectra, or compatibility with certain materials.

General FAQ

Who are we?

We are international chemical products supply chain company based in Shanghai, China with more than 10 years working experience, sell to Eastern Europe(50.00%), North America(30.00%), Africa(10.00%), Southeast Asia(5.00%), Eastern Asia(5.00%). There are total about 10–15 people in our office. 

How can we guarantee quality?

Always a pre-production sample before mass production;
Always final Inspection before shipment;

What can you buy from us?

Coating auxiliaries,rubber chemicals, plastics, special pigments, flavors and fragrances, food additives, cosmetic raw materials, surfactant, etc

Why should you buy from us not from other suppliers?

WPA is a professional trading company specialized in export chemicals, Our actual capacity is 200,000 tons, with competitive price.We also provide fine checmicals and food additives. And we have a supply chain for chemicals.

What services can we provide?

Accepted Delivery Terms: FOB, CFR, CIF, EXW, FAS, CIP, FCA, CPT, Express Delivery
Accepted Payment Currency:USD, EUR, JPY, CAD, AUD, HKD, GBP, CNY, CHF;
Accepted Payment Type: T/T,L/C,D/P D/A, MoneyGram, Credit Card, PayPal, Western Union, Cash;
Language Spoken:English, Chinese, Russian

How long will it take for the product to be ready and delivered?

Normally within 20 days after order has been placed. For details, please contact us by phone or email.

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