Description

Tris[4,4'-Thiobis[6-tert-Butyl-m-Tolyl]] Phosphite is a high-performance organophosphite antioxidant widely used in polymer stabilization. This compound matters for its exceptional ability to prevent thermal and oxidative degradation, thereby extending the service life and maintaining the physical properties of sensitive materials. It is primarily needed by manufacturers in the plastics, rubber, and synthetic fiber industries who require reliable protection against processing and long-term environmental stress.

Application

• Primary antioxidant and process stabilizer for polyolefins (PP, HDPE, LDPE).
• Stabilizer for engineering plastics and high-impact polystyrene (HIPS) to prevent yellowing and embrittlement.
• Synergistic component in stabilization packages for synthetic rubbers and elastomers.
• Protective additive in adhesives and sealants to enhance thermal-oxidative stability.
• Stabilizer for polycarbonate and other condensation polymers susceptible to thermal degradation.
• Used in the production of masterbatches and polymer concentrates for consistent additive dispersion.

Basic Information

Product Name	Tris[4,4'-Thiobis[6-tert-Butyl-m-Tolyl]] Phosphite
CAS No.	36339-47-6
Molecular Formula	C75H99O3PS2
Molecular Weight	1151.79 g/mol
Synonyms	Tris(4,4'-thiobis(6-tert-butyl-m-cresyl)) phosphite; Tris(4,4'-thiobis(2-tert-butyl-5-methylphenyl)) phosphite; Phosphorous acid, tris[4,4'-thiobis[6-(1,1-dimethylethyl)-m-tolyl]] ester; Antioxidant 168 (common industry name); Irgafos 168 (trade name); Hostanox PAR 24; Alkanox 240; Weston 618; AO-168.
EINECS	Contact for details

Quality Control

Our production of Tris[4,4'-Thiobis[6-tert-Butyl-m-Tolyl]] Phosphite adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, identification, and impurity profile analysis, to ensure it meets the high-purity standards required for polymer applications. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and easily oxidized; it is recommended to store under an inert atmosphere (e.g., nitrogen) for long-term preservation and to minimize exposure to ambient air during handling.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	183 - 187 °C
Loss on Drying	≤ 0.5 %
Ash Content	≤ 0.1 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.