Is Antioxidant 168 the same as AO-168?

Yes. AO-168 is a common abbreviation for Antioxidant 168, CAS 31570-04-4. The offered material should be confirmed by its chemical identity, grade and batch release data rather than by the shorthand name alone.

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

Antioxidant 168 is a phosphite processing stabiliser, while hindered phenolics act as primary antioxidants. They may be combined where a formulation requires complementary stabilisation during polymer melt processing; the ratio must suit the specific resin system.

Which release values are relevant for an Antioxidant 168 lot?

Confirm the agreed assay together with melting range, volatile matter, ash and light-transmittance values where specified. The COA limits should match the processing conditions and the polymer formulation for which the material is being selected.

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

Antioxidant 168 (AO-168) CAS 31570-04-4, also known as AO-168 or Tris(2,4-di-tert-butylphenyl) phosphite, is a phosphite processing stabiliser used with Antioxidant 1010 (AO-1010) in polyolefin and engineering-plastic formulations.

White crystalline powder is supplied in PE-lined 25 kg kraft composite bags or cartons; COA, TDS and SDS are available for the offered grade.

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; white crystalline powder
Package: 25 kg PE-lined kraft composite bags or cartons; pallet quantities subject to order confirmation

Request a quote

Share:

Product Description

1 Product Introduction

2 Applications

3 Grade and Supply Details

Product Introduction

Antioxidant 168 (AO-168) (CAS 31570-04-4), tris(2,4-di-tert-butylphenyl) phosphite, is supplied as a phosphite processing stabiliser for polymer compounding. We offer AO-168 where the formulation specifies a secondary antioxidant during melt processing, often alongside an approved primary phenolic antioxidant. It is quoted as its own phosphite grade, not as a replacement for the primary antioxidant in a stabiliser package.

Applications

Polyethylene, polypropylene and olefin copolymer compounding and pelletising.
Polycarbonates, polyamides, polyesters and styrenic polymer systems that specify a phosphite stabiliser.
Elastomer, adhesive, tackifier-resin and selected coating-resin formulations.
Polymer stabiliser packages combining AO-168 with a specified phenolic antioxidant or light stabiliser.

Grade and Supply Details

We confirm the required assay, colour, melting range, volatile or hydrolysis-related limit, physical form and stated test method for the agreed formulation. AO-168 is normally offered as a white free-flowing powder in the selected packaging. A batch COA, with the applicable TDS and SDS, is available for the offered material.

For related polymer and rubber antioxidant pages, compare Antioxidant 1010, Antioxidant SP, and Rubber Antioxidant TMQ.

FAQ - Technical & Supply Chain

Q:
Is Antioxidant 168 the same as AO-168?

A: Yes. AO-168 is a common abbreviation for Antioxidant 168, CAS 31570-04-4. The offered material should be confirmed by its chemical identity, grade and batch release data rather than by the shorthand name alone.
Q:
Why is Antioxidant 168 often used with a hindered phenolic antioxidant?

A: Antioxidant 168 is a phosphite processing stabiliser, while hindered phenolics act as primary antioxidants. They may be combined where a formulation requires complementary stabilisation during polymer melt processing; the ratio must suit the specific resin system.
Q:
Which release values are relevant for an Antioxidant 168 lot?

A: Confirm the agreed assay together with melting range, volatile matter, ash and light-transmittance values where specified. The COA limits should match the processing conditions and the polymer formulation for which the material is being selected.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

Current Language

Change Language