1. General-purpose and Engineering Plastics

In the processing of materials such as polypropylene (PP), polyethylene (PE), ABS resin, and polycarbonate (PC) alloys, it is compounded with primary antioxidants to provide thermal stability protection.

2. Synthetic Rubber and Elastomers

Used in the compounding and processing of rubber compounds such as styrene-butadiene rubber (SBR), butadiene rubber (BR), and ethylene propylene diene monomer (EPDM) to prevent “self-curing” or plastic changes.

3. Adhesives and Coatings

Added to polymer-based adhesives, sealants, and coatings to prevent deterioration due to oxidation during manufacturing or storage.

4. Polyurethane Industry

Sometimes used as an auxiliary antioxidant and stabilizer in the production of polyurethane foams or elastomers.

⚙️ Key Usage Characteristics

Synergistic compounding: It is rarely used alone. It is usually compounded with hindered phenolic antioxidants (such as antioxidants 1010, 1076, 1135, etc.) to form a classic “phenol + phosphite” combination, achieving comprehensive protection from processing to long-term thermal aging.

Prevention of yellowing: For materials prone to discoloration such as polypropylene and ABS, its effect in preventing processing yellowing is particularly outstanding.

Liquid form: These phosphite products are usually liquids, making them easy to meter and mix in polymer material production, and ensuring uniform dispersion.