IRGAFOS P-EPQ CAS 119345-01-6

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CAS:119345-01-6

Molecular Formula:C26H32Cl3OP

Molecular Weight:497.86

EINECS:432-130-2

IRGAFOS P-EPQ is hydrolyzable. IRGAFOS P-EPQ is a white solid powder, soluble in alcohol, methylene chloride, chloroform, toluene and other organic solvents, almost soluble in water.

Item	Specification
Melting point	93-99 °C(lit.)
Boiling point	280℃[at 101 325 Pa]
Density	1.04[at 20℃]
Vapor pressure	0Pa at 25℃
LogP	6 at 20℃

IRGAFOS P-EPQ is a high-molecular-weight phosphite antioxidant specially developed for demanding high-temperature polymer applications. Compared with conventional phosphite antioxidants, it offers superior hydrolysis resistance, thermal stability, and long-term processing protection in advanced resin systems.

1. Engineering Plastics & High-Temperature Resins

IRGAFOS P-EPQ is widely used in engineering plastics such as polycarbonate (PC), polyester, polyamide (PA), PPO, and modified resin compounds. It helps reduce molecular degradation during extrusion and injection molding while maintaining resin color and mechanical properties.

In high-performance compounding systems, it is often used together with Antioxidant 626 for enhanced processing stabilization in engineering polymers.

2. Powder Coatings & Coil Coatings

Due to its excellent thermal resistance, IRGAFOS P-EPQ is particularly suitable for powder coatings, coil coatings, and industrial baking systems requiring high curing temperatures. It improves coating durability and minimizes thermal yellowing during curing processes.

3. Polyolefin Compounds

In polypropylene and polyethylene compounding, IRGAFOS P-EPQ functions as an advanced phosphite processing stabilizer that improves melt stability and reduces oxidative degradation under severe processing conditions.

It can also work synergistically with LOTSORB AN 136 in high-temperature PP fiber and recycled polyolefin applications.

4. Adhesives & Specialty Resin Systems

IRGAFOS P-EPQ is commonly applied in hot melt adhesives and specialty resin formulations requiring excellent long-term thermal stability and low volatility. Its high molecular weight helps minimize migration during storage and processing.

5. Automotive & Electronic Materials

The product is suitable for automotive interior plastics, electronic materials, and high-end industrial compounds where heat resistance and processing consistency are critical.

Discover more polymer stabilization materials on the Unisunchem Home Page and browse the Polymer Additives Collection.

Excellent hydrolysis resistance compared with conventional phosphite antioxidants
Outstanding thermal stability in high-temperature polymer processing
High molecular weight with low volatility and low migration
Reduces resin discoloration and viscosity loss during extrusion
Particularly suitable for engineering plastics and powder coatings
Improves long-term processing consistency in recycled polymers
Effective in demanding automotive and electronic material applications
Compatible with advanced stabilization systems for polyolefins and specialty resins
Reliable global supply from Unisunchem

25kg/drum or according to customer requirements.

Q1: What is the difference between IRGAFOS P-EPQ and Antioxidant 168?

IRGAFOS P-EPQ has significantly better hydrolysis resistance and thermal stability than traditional phosphite antioxidants such as Antioxidant 168. It is more suitable for engineering plastics, powder coatings, and high-temperature processing systems.

Q2: Why is IRGAFOS P-EPQ used in powder coatings?

Powder coating systems often require curing at elevated temperatures. IRGAFOS P-EPQ helps minimize thermal yellowing and resin degradation during the baking process while improving coating durability.

Q3: Is IRGAFOS P-EPQ suitable for recycled engineering plastics?

Yes. IRGAFOS P-EPQ is widely used in recycled engineering plastic compounds because it improves melt stability and helps maintain mechanical performance during repeated thermal processing.

Q4: Does IRGAFOS P-EPQ have good hydrolysis stability?

Yes. One of the main advantages of IRGAFOS P-EPQ is its superior resistance to hydrolysis, making it suitable for moisture-sensitive polymer systems and demanding industrial applications.

Q5: Which industries commonly use IRGAFOS P-EPQ?

IRGAFOS P-EPQ is commonly used in automotive plastics, electronic materials, powder coatings, hot melt adhesives, engineering compounds, and specialty polymer manufacturing.