What is Antioxidant 168 AO-168 CAS 31570-04-4?

Antioxidant 168, also called AO-168, is tris(2,4-di-tert-butylphenyl) phosphite. It is a secondary phosphite antioxidant used mainly as a polymer melt-processing stabilizer.

Why is Antioxidant 168 often used with a hindered phenolic antioxidant?

Antioxidant 168 is a phosphite processing stabilizer that decomposes hydroperoxides during melt processing, while a hindered phenolic such as Antioxidant 1010 acts as a primary antioxidant for long-term thermal aging. Combining them provides complementary protection, so the ratio should be matched to the polymer system and processing conditions.

What is the difference between Antioxidant 168 and Antioxidant 1010?

Antioxidant 168 is a secondary phosphite antioxidant with CAS 31570-04-4, while Antioxidant 1010 is a primary hindered phenolic antioxidant with CAS 6683-19-8. They are not interchangeable; each performs a different function in a stabilizer package.

What are the typical properties of Antioxidant 168?

It is normally a white powder or granular material with a molecular formula of C42H63O3P and molecular weight of about 646.92 g/mol. Commercial grades commonly have a melting range around 181-189 deg C, low volatility, good thermal stability and good hydrolysis resistance.

Which Antioxidant 168 specifications should polymer compounders confirm?

Confirm appearance, assay, melting range, acid value, volatile matter and any required transmittance values for the application. These limits should match the polymer, processing temperature and the specified stabilizer ratio.

Antioxidant 168 (AO-168) CAS 31570-04-4

Antioxidant 168, commonly abbreviated AO-168, CAS 31570-04-4, is a secondary phosphite antioxidant supplied as a white crystalline powder for polymer melt-processing stabilization. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 31570-04-4
Synonyms: AO-168; Tris(2,4-di-tert-butylphenyl) phosphite
Einecs: 250-709-6
Molecular Formula: C42H63O3P
Grade: Industrial polymer-stabiliser grade
Package: 25 kg PE-lined kraft composite bags or cartons

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Product Description

Antioxidant 168 (AO-168) CAS 31570-04-4 is tris(2,4-di-tert-butylphenyl) phosphite, with EC 250-709-6 and molecular formula C42H63O3P.

Synonyms: AO-168; Tris(2,4-di-tert-butylphenyl) phosphite.

CAS: 31570-04-4.

Molecular formula: C42H63O3P.

It has a molecular weight of about 646.92 g/mol.

It is supplied as a white crystalline powder.

It is positioned as a secondary phosphite antioxidant for polymer melt-processing stabilization.

It decomposes hydroperoxides during melt processing.

It is used with a hindered phenolic primary antioxidant such as Antioxidant 1010 for complementary protection.

It is used in polyolefin and engineering-plastic formulations.

Commercial grades commonly have a melting range around 181-189 C, low volatility, good thermal stability and good hydrolysis resistance.

It is not interchangeable with Antioxidant 1010; each performs a different function in a stabilizer package.

Confirm appearance, assay, melting range, acid value, volatile matter, and required transmittance values.

Store in tightly closed containers in a cool, dry, well-ventilated area, away from moisture and direct sunlight.

Use suitable PPE when handling the powder to prevent dust exposure and skin or eye contact.

Confirm packaging suitable for the solid form and order quantity, and follow the current SDS.

Confirm grade, packaging, and specification as required.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Antioxidant 168 AO-168 CAS 31570-04-4?

A: Antioxidant 168, also called AO-168, is tris(2,4-di-tert-butylphenyl) phosphite. It is a secondary phosphite antioxidant used mainly as a polymer melt-processing stabilizer.
Q:
Why is Antioxidant 168 often used with a hindered phenolic antioxidant?

A: Antioxidant 168 is a phosphite processing stabilizer that decomposes hydroperoxides during melt processing, while a hindered phenolic such as Antioxidant 1010 acts as a primary antioxidant for long-term thermal aging. Combining them provides complementary protection, so the ratio should be matched to the polymer system and processing conditions.
Q:
What is the difference between Antioxidant 168 and Antioxidant 1010?

A: Antioxidant 168 is a secondary phosphite antioxidant with CAS 31570-04-4, while Antioxidant 1010 is a primary hindered phenolic antioxidant with CAS 6683-19-8. They are not interchangeable; each performs a different function in a stabilizer package.
Q:
What are the typical properties of Antioxidant 168?

A: It is normally a white powder or granular material with a molecular formula of C42H63O3P and molecular weight of about 646.92 g/mol. Commercial grades commonly have a melting range around 181-189 deg C, low volatility, good thermal stability and good hydrolysis resistance.
Q:
Which Antioxidant 168 specifications should polymer compounders confirm?

A: Confirm appearance, assay, melting range, acid value, volatile matter and any required transmittance values for the application. These limits should match the polymer, processing temperature and the specified stabilizer ratio.

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