Antioxidant 618 CAS 3806-34-6

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CAS:3806-34-6

Molecular Formula:C41H82O6P2

Molecular Weight:733.03

EINECS:223-276-6

Antioxidant 618 is insoluble in water. Antioxidant 618 has a white waxy solid form. Antioxidant 618 has a melting point of 54 to 56 ° C, a relative density of 0.940 to 0.960 and an refractive index of 1.4610 to 1.4660. The solubility was 14.7 for benzene, 0.3 for hexane, 45.0 for chloroform, 0.3 for acetone and 0.3 for methanol.

Item	Specification
Melting point	44-47 °C(lit.)
Boiling point	692.2±55.0 °C(Predicted)
Density	1.05[at 20℃]
Vapor pressure	0Pa at 25℃
Flash point	>230 °F
LogP	16.4 at 25℃

Antioxidant 618 is a high-efficiency phosphite antioxidant designed to improve polymer processing stability, color retention, and hydroperoxide decomposition during high-temperature manufacturing. Compared with conventional phosphite stabilizers, it offers excellent transparency, low volatility, and strong anti-yellowing performance in demanding resin systems.

1. Polypropylene & Polyethylene Extrusion

Antioxidant 618 is widely used in PP, PE, HDPE, and LLDPE extrusion systems where melt stability and initial color control are critical. It effectively decomposes hydroperoxides generated during extrusion, helping reduce polymer chain degradation and improving long-term thermal stability.

Typical applications include:

BOPP film
injection molding
raffia yarn
blow molding
recycled polyolefin compounds

In high-output extrusion lines, Antioxidant 618 is frequently combined with hindered phenolic antioxidants such as Antioxidant 1076 to achieve balanced processing and long-term stabilization.

2. ABS & Styrenic Resin Compounds

Antioxidant 618 performs especially well in ABS, HIPS, and styrenic resin modification systems where processing discoloration and gas fading are common challenges. It improves resin brightness and helps maintain stable melt viscosity during repeated thermal processing.

The product is widely used in:

appliance housings
electronic components
office equipment plastics
modified ABS compounds

3. EVA & Hot Melt Adhesives

In EVA copolymers and hot melt adhesive formulations, Antioxidant 618 enhances processing stability and reduces oxidation caused by prolonged heating in adhesive tanks and coating systems. Its low-color characteristic makes it suitable for transparent adhesive applications.

For adhesive systems requiring low migration performance, it can also work synergistically with IRGANOX 3052.

4. Engineering Plastics & Transparent Resins

Antioxidant 618 is suitable for PC, polyester, PBT, PVC, and engineering thermoplastics requiring high transparency and stable processing behavior. It helps suppress thermal oxidation while minimizing resin yellowing during molding.

5. Food Packaging & Light-Colored Polymer Systems

Because of its low toxicity and excellent transparency retention, Antioxidant 618 is widely applied in food packaging materials and light-colored polymer products. In some formulations, it can partially replace conventional stabilizers such as BHT and thioester antioxidants.

Explore more phosphite antioxidants and polymer processing stabilizers in the Antioxidant Product Category or browse additional industrial additives in the Product Collection.

High-efficiency phosphorus-based secondary antioxidant
Excellent hydroperoxide decomposition capability during polymer processing
Outstanding initial color improvement and anti-yellowing performance
Good transparency retention in light-colored and transparent polymers
Strong processing stabilization for PP, PE, ABS, EVA, and PVC systems
Excellent compatibility with phenolic antioxidants and HALS stabilizers
Low volatility and stable performance under high-temperature extrusion
Effective gas fading resistance in styrenic polymers
Suitable for food packaging and low-odor polymer applications
Reliable industrial supply from Unisunchem

25kg/drum or according to customer requirements.

Q1: What is the difference between Antioxidant 618 and Antioxidant 168?

Both are phosphite processing stabilizers, but Antioxidant 618 is often preferred in applications requiring better initial color, transparency, and gas fading resistance, especially in ABS and light-colored polymers. Antioxidant 168 is more commonly used in general-purpose polyolefin extrusion.

Q2: Why is Antioxidant 618 widely used in ABS resin?

ABS processing can easily lead to discoloration and molecular degradation during repeated heating cycles. Antioxidant 618 improves color stability, reduces gas fading, and helps maintain resin processing consistency.

Q3: Can Antioxidant 618 improve transparency in plastics?

Yes. Antioxidant 618 is known for its excellent transparency retention and low-color characteristics, making it suitable for transparent films, packaging materials, and light-colored polymer products.

Q4: Is Antioxidant 618 suitable for food packaging applications?

Yes. Antioxidant 618 has been approved for certain food-contact polymer applications and is commonly used in food packaging materials because of its low toxicity and good extraction resistance.

Q5: Can Antioxidant 618 be used with hindered phenolic antioxidants?

Yes. Antioxidant 618 is frequently combined with phenolic antioxidants such as Antioxidant 1076 to create synergistic stabilization systems for polyolefins and engineering plastics.