Description

Palmityl 3,5-di-tert-butyl-4-hydroxybenzoate (CAS No. 67845-93-6) is a high-performance phenolic antioxidant and UV stabilizer widely used in polymer and coating applications. With the molecular formula C₃₁H₅₄O₃, this ester derivative of 3,5-di-tert-butyl-4-hydroxybenzoic acid offers exceptional thermal stability and resistance to oxidative degradation. Its long alkyl chain (hexadecyl/palmityl group) enhances compatibility with non-polar matrices, making it ideal for polyolefins, elastomers, adhesives, and lubricants. Known commercially as CYASORB® UV 2908 or UV Absorber 2908, it effectively scavenges free radicals and extends material lifespan under harsh environmental conditions. This product is supplied as a white crystalline powder with minimal volatility, ensuring long-term performance in high-temperature processing. Suitable for research, industrial R&D, and manufacturing, it meets stringent purity standards for sensitive applications.

Properties

• CAS Number: 67845-93-6
• Complexity: 504
• IUPAC Name: hexadecyl 3,5-ditert-butyl-4-hydroxy-benzoate
• InChI: InChI=1S/C31H54O3/c1-8-9-10-11-12-13-14-15-16-17-18-19-20-21-22-34-29(33)25-23-26(30(2,3)4)28(32)27(24-25)31(5,6)7/h23-24,32H,8-22H2,1-7H3
• InChI Key: NZYMWGXNIUZYRC-UHFFFAOYSA-N
• Exact Mass: 474.40729558
• Molecular Formula: C31H54O3
• Molecular Weight: 474.8
• SMILES: CCCCCCCCCCCCCCCCOC(=O)C1=CC(=C(C(=C1)C(C)(C)C)O)C(C)(C)C
• Topological: 46.5
• Monoisotopic Mass: 474.40729558
• Physical Description: Dry Powder; Dry Powder, Pellets or Large Crystals; Pellets or Large Crystals
• Synonyms: 67845-93-6, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, Hexadecyl 3,5-bis-tert-butyl-4-hydroxybenzoate, Benzoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-, hexadecyl ester, Palmityl 3,5-di-tert-butyl-4-hydroxybenzoate, EINECS 267-342-2, S43L542RUG, 3,5-Bis(1,1-dimethylethyl)-4-hydroxybenzoic acid, hexadecyl ester, CYAGARD UV 2908, CYASORB UV 2908, DTXSID0052382, EC 267-342-2, UV 2908, CETYL 3,5-DI-TERT-BUTYL-4-HYDROXYBENZOATE, 267-342-2, DTXCID0030954, 3,5-Di-tert-butyl-4-hydroxybenzoic acid hexadecyl ester, hexadecyl 3,5-ditert-butyl-4-hydroxybenzoate, MFCD00180757, 3,5-ditert-butyl-4-hydroxybenzoic acid hexadecyl ester, 4-(2-acryloxyethoxy)-2-hydroxybenzophenone, UV Absorber 2908, C31H54O3, UNII-S43L542RUG, SCHEMBL78664, NZYMWGXNIUZYRC-UHFFFAOYSA-N, AKOS015888118, cetyl-3,5-di-t-butyl-4-hydroxybenzoate, AS-10043, SY011681, DB-055070, CS-0152192, H1709, NS00004055, Q27288558, 3,5-Di-tert-butyl-4-hydroxybenzoic acid-hexadecyl ester, 3,5-di-tert-butyl-4-hydroxybenzoic acid, hexadecyl ester

Palmityl 3,5-di-tert-butyl-4-hydroxybenzoate is primarily used as a light stabilizer and antioxidant in polyethylene, polypropylene, and other polymers to prevent UV-induced degradation. It also functions as an additive in synthetic lubricants and greases to enhance oxidative stability at elevated temperatures. In coatings and adhesives, it mitigates yellowing and embrittlement caused by prolonged sunlight exposure. Researchers value its compatibility with hydrocarbon-based systems for studying long-term material durability.

Safety and Hazards

GHS Hazard Statements

• H411 (17.4%): Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]

Precautionary Statements

• P273, P391, and P501

Hazard Classes and Categories

• Aquatic Chronic 2 (17.4%)

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