Tiangang® AO-427

Tiangang® AO-427

Antioxidant · AO-427

Tiangang® AO-427 is a multifunctional processing aid that provides thermal and processing stability and improves dyeability, particularly suited to high-temperature polymers

In one sentence: A multifunctional processing aid combining heat stability, processing stability and improved dyeability, aimed at high-temperature polymers.

  • Active content: ≥98.0% (source: spec table on this page)
  • Melting point: 268 – 275 °C (source: spec table on this page)
  • Transmittance (425 nm): ≥90% (source: spec table on this page)
  • Transmittance (500 nm): ≥92% (source: spec table on this page)
  • Packaging: 18 kg per unit (source: packaging note on this page)

What it is

Tiangang® AO-427 is a antioxidant. Antioxidants come in two roles. Primary antioxidants (hindered phenols) trap radicals and stop the chain; secondary antioxidants (phosphites) decompose hydroperoxides. Used together they cover both processing and service life. Product identifiers: CAS 42774-15-2;

Technical data

AppearanceWhite to light yellow powder
Active content (%)≥98.0
Melting point (°C)268 - 275
Transmittance≥90% @ 425nm; ≥92% @ 500nm
Moisture (%)≤1.9
Ash (%)≤0.2

Where it is used, and at what loading

Polyolefins are the main field, followed by polyacetal, polyamide, polyester, PVC, polystyrene and elastomers. The higher the melt temperature and the longer the residence time, the more the system needs.

Primary (hindered phenol)0.05 – 0.3%
Secondary (phosphite)0.05 – 0.2%
One-pack blends0.1 – 0.5%

Figures above are typical industry ranges, not guaranteed values. The actual loading depends on wall thickness, design life and the other additives in the system, and should be established by a loading ladder on the real formulation.

Choosing between similar grades

Three things decide the choice for AO-427: molecular weight and volatility, basicity, and compatibility with the other components in the system. A multifunctional processing aid combining heat stability, processing stability and improved dyeability for high-temperature engineering materials. Not a pure antioxidant — read it together with the primary.

Frequently asked questions

Do primary and secondary antioxidants have to be used together?

In most cases yes. The primary handles radicals, the secondary handles hydroperoxides; using only one leaves the other degradation path open. Blends such as B215, B225 and B277 pre-mix the two, which removes weighing error at the line.

Why does low initial colour matter?

Some phenolic antioxidants form quinoid structures during processing and yellow the part. Fibre, film and light-coloured articles are most sensitive. Low-colour grades suppress that side reaction at the source.

Can antioxidants and light stabilizers interfere?

Yes, mainly through acid-base conflict. Acidic components (some phosphites, halogenated flame retardants) deactivate highly basic HALS. We look at both sides of the balance and switch to a low-basicity HALS where needed.

The figures and guidance above follow Tiangang's published technical material and common industry practice. For a specific formulation, refer to the batch COA and the technical agreement between the parties.

Technical reviewTiangang Technical CenterVersion2026-11-07
Specifications and application notes on this page are compiled from Tiangang's published technical data. Actual values are governed by the COA shipped with each lot and the technical agreement confirmed by both parties.

Certifications

  • National High-Tech Enterprise
  • Vice Chairman Unit, China Plastics Processing Industry Association (CPPIA)
  • Vice Chairman Unit, Agricultural Plastics Branch, China Agricultural Plastics Application Technology Society
  • Member, Ageing Methods Subcommittee, National Technical Committee on Plastics (SAC/TC15/CS5)
  • Member, Society of the Plastics Industry (SPI), USA

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