How should UVI‑6974 / UVI‑6976 be stored?

Store at ‑20 °C inside a hermetically sealed container under inert gas atmosphere. The material is hygroscopic and must be kept away from moisture. When stored properly, it stays stable for 12‑24 months.

What purity and packaging options do you offer for UVI‑6974 / UVI‑6976?

We provide ≥98% purity verified by HPLC. Available pack sizes include 25 g, 100 g and bulk volumes. Custom‑tailored packaging can be arranged upon request.

4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate CAS 71449-78-0

Q: What is the mechanism of action of UVI‑6974 / UVI‑6976 photoinitiator?

Upon UV irradiation, the sulfonium bond undergoes cleavage and releases protons to trigger cationic polymerization. This acid‑catalyzed cross‑linking delivers low shrinkage and good oxygen tolerance when compared with free‑radical curing systems.

Q: What is the difference between UVI‑6974 and UVI‑6976?

UVI‑6974 and UVI‑6976 designate the same substance: 4‑Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate (CAS 71449‑78‑0). These are different trade codes adopted by various suppliers for the identical chemical.

98% / 99% High Purity 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate CAS 71449-78-0

Appearance:powder
Proportion: Minimum 99.0%
Inventory: In stock
Sample: Free sample
Zhishang Chemical: Supplier and manufacturer of 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate CAS 71449-78-0

Description of 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate

4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate (CAS 71449-78-0, C₂₄H₁₉F₆S₂Sb, MW 607.29) is a triarylsulfonium salt that functions as a cationic photoinitiator for UV curing systems. The compound appears as a white to off-white crystalline powder with a melting point of 118-119°C and density of 1.4 g/cm³ . Its common commercial names include UVI-6974, UVI-6976, and CAT6992 .

Upon UV exposure, this sulfonium salt undergoes photolytic cleavage and releases a proton that initiates cationic polymerization . This mechanism differs from radical photoinitiators—curing is less inhibited by oxygen and produces minimal shrinkage, making it ideal for precision applications .

Key Applications

UV-Curable Coatings and Inks:

Used in formulations for electronics, automotive, and industrial coatings requiring fast curing and low shrinkage .

Adhesives and Sealants:

Provides rapid bonding in electronics and medical device assembly .

Photolithography and 3D Printing:

Functions as a photoacid generator for circuit board production and additive manufacturing processes .

4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate Chemical Properties
Melting point	118-119 °C
density	1,4 g/cm3
vapor pressure	0.002Pa at 25℃
Fp	145°C
storage temp.	Hygroscopic, -20°C Freezer, Under inert atmosphere
solubility	Chloroform (Sparingly), DMSO (Sparingly)
form	Solid
color	White to Off-White
Specific Gravity	1.40
Hydrolytic Sensitivity	4: no reaction with water under neutral conditions
InChI	InChI=1S/C24H19S2.6FH.Sb/c1-4-10-20(11-5-1)25-21-16-18-24(19-17-21)26(22-12-6-2-7-13-22)23-14-8-3-9-15-23;;;;;;;/h1-19H;6*1H;/q+1;;;;;;;+5/p-6
InChIKey	SQPBZCDQRJYQKD-UHFFFAOYSA-H

4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate 's supply advantage and supply capability

Quality Control

We supply CAS 71449-78-0 with ≥98% purity verified by HPLC. Each batch undergoes testing for appearance, melting point, and solubility. Given the compound’s hygroscopic nature (requiring -20°C storage under inert atmosphere) , we provide specialized packaging to maintain reactivity during transport. A complete COA accompanies every shipment.

Inventory and Supply Chain

We maintain stock at central warehouse, supporting both R&D and bulk orders. Standard packaging includes 25g to bulk sizes. Research quantities ship within 1-2 business days. Bulk orders require 5-7 business days processing. Products are stored under recommended conditions, ensuring stability and reactivity upon delivery.

Technical Support

Our technical team provides guidance on sulfonium salt selection and integration into epoxy, acrylate, and hybrid UV-curable systems. We offer complete documentation, including COA and MSDS, to support your regulatory and quality compliance.

The packaging of 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate

We will use different standard packaging according to the product form.
● Liquid product: packaged in blue plastic drums, with a standard specification of 200 kg/drum; 220kg/barrel/250kg/barrel, tightly sealed barrel mouth, leak proof, resistant to bumps, suitable for long-distance transportation.

● Powdered products: packaged in thick cardboard drums, with a standard net weight of 25 kilograms per drum; 200 kg/barrel; 220kg/barrel/250kg/barrel, the barrel body is sturdy and pressure resistant, while also having good moisture resistance.

● Sample: sealed uniformly in aluminum foil bags with strong sealing abilities, which can prevent moisture and air from entering the bag and cause it to deteriorate.

Packaging can be tailored to meet customer needs, with standard packaging processes that ensure the quality of goods is maintained during storage and transport.

4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate Supplier and Manufacturer

As a 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate supplier and manufacturer with a strict standard product quality system certificate, Zhishang Chemical has long been providing the best 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate raw materials to customers all over the world.

Over the years, relying on professional team experience and customer-centric team concept to meet customer needs in a timely manner, our company enjoys a high reputation in the world. At present, our company has served more than 6,000 customers and has established long-term cooperative relations with customers from many countries.

If you have a demand for 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate and related products, please contact our service staff Zhishang Chemical – White directly, and we will provide you with high-quality products at the best price.

Zhishang Chemical has its own R&D lab, with professional teams and advanced equipment. We also have rigorous processes and procedures to ensure the quality of our products.

▶ The laboratory is over 1500 square metres in size, and has been divided into functional zones to accommodate testing requirements.

▶ The core R&D Team consists of three PhDs and seven or more masters with rich technical expertise.

▶ Equipment with international advanced analytical and testing equipment, such as HPLC GC, FTIR NMR AAS etc. to achieve precise control during the entire process.

▶ We can develop customized products and will optimize formulas and processes according to customer needs.

▶ Set strict standards for product quality inspection and make sure that each batch is subjected to multiple inspection stages in order to ensure stable and reliable performance.

FAQ:

What is the mechanism of action of this photoinitiator?

Upon UV exposure, the sulfonium bond cleaves, generating a proton that initiates cationic polymerization. This acid-catalyzed crosslinking provides low shrinkage and oxygen tolerance compared to radical systems

What is the difference between UVI-6974 and UVI-6976?

Both names refer to the same compound—4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate (CAS 71449-78-0). Different suppliers use different codes for this material

How should this product be stored?

Store at -20°C in a sealed container under inert atmosphere. It is hygroscopic, so protect from moisture. Under these conditions, it remains stable for 12-24 months

What purity and packaging options do you offer?

We supply ≥98% purity (HPLC). Packaging includes 25g, 100g, and bulk sizes. Custom packaging is available upon request.

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Get top-quality 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate, along with custom solutions. Our expert team is here to help – contact us today!