O que é antioxidante 168 Usado para? Formulários, Especificações e fornecimento

Por David, Fundador & Diretor de Vendas, 25 years in chemical sales and sourcing
Published June 30, 2026 · Updated November 2026

Antioxidante 168 is used to protect plastics while they are being processed. It is a phosphite secondary antioxidant — tris(2,4-di-terc-butilfenil) fosfito, CAS 31570-04-4 — that helps limit discoloration, changes in melt flow and polymer degradation during extrusion and molding. It is widely used in polyolefins such as polypropylene and polyethylene, normally together with a phenolic primary antioxidant such as Antioxidant 1010 ou 1076.

If you are buying it, confirm three things first: the blend you will use it in, the COA parameters your incoming inspection checks, and whether your finished product needs a food-contact statement. SUNCHEM supplies it as SUNNOX® 168.

Neste artigo

1. What Antioxidant 168 is and how it works
2. Where it is used
3. Sourcing: what to check before you order
4. Perguntas frequentes

What Antioxidant 168 Is and How It Works

Como antioxidante secundário, Antioxidante 168 decomposes the hydroperoxides that form during melt processing, converting them into non-radical, non-reactive products before they can drive further degradation. This helps protect the polymer during high-temperature extrusion and injection molding, limiting changes in melt flow, color and molecular weight.

Antioxidante 168 is often combined with a phenolic primary antioxidant. The primary antioxidant reacts with free radicals, while 168 decomposes hydroperoxides and helps protect both the polymer and the primary antioxidant during processing. Ver Antioxidante 1010 contra 168: Como escolher for their complementary roles.

Where Antioxidant 168 Is Used

168 is also used in elastomers. For polyesters (BICHO DE ESTIMAÇÃO, PBT) and TPU, confirm suitability with your resin supplier and a trial before changing an approved package.

How to set the level for a trial

This article does not give a fixed dosage, because the right level of 168 and its balance with the phenolic depend on your system. Build the trial plan from:

• Resin and grade — polymer type, catalyst system, and whether the base resin already contains a stabilizer package from the resin producer
• Processing conditions — melt temperature, residence time and how many heat histories the material goes through
• Your existing stabilizer package — start from the approved formulation and change one variable at a time
• Service and regulatory requirements — long-term heat exposure, color limits, and any restrictions on additive levels for food-contact use

Use your resin supplier's recommendations and the stabilizer producer's application data to set the trial range, then confirm it with processing trials and the tests your customer specifies, such as color and melt flow measured on processed samples.

Obtendo Antioxidante 168: What to Check Before You Order

168 is produced by many manufacturers under many trade names, so a matching CAS number does not by itself qualify a new source. Compare COAs on the parameters that affect your process, run a trial, and keep the approved lot COA as your reference.

COA parameters worth comparing

• Ensaio (pureza)
• Melting range
• Volatile matter
• Light transmittance at 425 nm and 500 nm — an indicator of color

Ask for the same parameters your incoming-inspection sheet uses, ask the supplier which specification currently applies to the grade you are quoting, and make sure the agreed limits are written into the quotation or contract.

What to put in your RFQ

• Polímero, application and your current antioxidant package
• Required specification — your current TDS or COA
• Quantidade (trial, monthly or annual), packaging and destination port
• Documents required for your intended application and destination market (for example COA, TDS, FDS, ALCANÇAR, declaração de contato com alimentos)

Please specify your required physical form, destination market and documentation requirements in your enquiry. Confirm the available grade and supporting documents before placing an order.

Keep the packaging sealed and store it in a cool, dry place.

Perguntas frequentes

É antioxidante 168 o mesmo que Irgafos 168?

They are the same chemical substance, tris(2,4-di-terc-butilfenil) fosfito (CAS 31570-04-4). Irgafos® 168 is BASF's trade name; "Antioxidante 168" is the generic name used by many producers. The same CAS number does not guarantee the same purity, impurity profile or physical form, so compare COAs and run a trial before replacing an approved grade.

É antioxidante 168 approved for food contact?

This is three separate questions, and each needs its own evidence.

• The substance. In the US, tris(2,4-di-terc-butilfenil) phosphite is listed in 21 CFR 178.2010 (antioxidants and/or stabilizers for polymers), subject to the limitations on polymer types, use levels and conditions of use stated in that section. For the EU, confirm the applicable entry and any restrictions under Regulation (UE) Não 10/2011 against the grade's documentation.
• The grade. A substance listing alone does not establish compliance of a particular supplier's grade. Ask the supplier for grade-specific documentation covering the intended market and use.
• The finished article. The finished article needs its own compliance assessment for the intended market and use, including any required documentation and testing.

Pode antioxidante 168 be used alone?

Antioxidante 168 is primarily a processing stabilizer and is often combined with a primary antioxidant such as SUNNOX® 1010 ou SUNNOX® 1076. The complete stabilizer package should be selected and validated for both processing conditions and the required service life.

How do I choose the balance between 168 and the phenolic antioxidant?

There is no single ratio that fits every resin. Start from your current approved package or your resin supplier's recommendation, use the stabilizer producer's application data to set a trial range, and change one variable at a time so the trial shows what made the difference. Resin type, temperatura de processamento, number of heat histories and service requirements all affect the result.

Need Antioxidant 168 for a trial or your next order?
Send your polymer, aplicativo, quantity and destination port, plus your current COA or specification, so we can prepare a quotation for SUNNOX® 168. Please specify your required physical form, destination market and documentation requirements in your enquiry.
Request a quote → · Ask for the current applicable specification: david@sunchemgroup.com

Related: Antioxidante 1010 contra 168: Como escolher · Plastic Additives from SUNCHEM