Description

Distearyl pentaerythritol diphosphite (CAS 3806-34-6) is a high-purity organophosphite antioxidant widely used in polymer stabilization and specialty chemical applications. This compound, with the molecular formula C₄₁H₈₂O₆P₂, is chemically designated as 3,9-dioctadecoxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane. Its unique spirocyclic structure provides exceptional hydrolytic stability and efficient radical scavenging properties.

Our product is synthesized under strict quality control to ensure >98% purity (HPLC), with low levels of residual solvents and heavy metals (<5 ppm). It is supplied as a white to off-white waxy solid with a typical melting range of 50-55°C. The material is packaged under nitrogen atmosphere in amber glass bottles or foil-lined bags to prevent oxidation and moisture absorption.

Key features include:

• Excellent compatibility with polyolefins, PVC, and engineering plastics
• Synergistic effects when combined with phenolic antioxidants
• Low volatility for long-term thermal stability
• FDA-compliant for certain indirect food contact applications

Technical specifications include: molecular weight 733.04 g/mol, density 0.95 g/cm³ at 25°C, and solubility in common organic solvents (toluene, chloroform) while being insoluble in water.

Properties

• CAS Number: 3806-34-6
• Complexity: 611
• IUPAC Name: 3,9-dioctadecoxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane
• InChI: InChI=1S/C41H82O6P2/c1-3-5-7-9-11-13-15-17-19-21-23-25-27-29-31-33-35-42-48-44-37-41(38-45-48)39-46-49(47-40-41)43-36-34-32-30-28-26-24-22-20-18-16-14-12-10-8-6-4-2/h3-40H2,1-2H3
• InChI Key: PZRWFKGUFWPFID-UHFFFAOYSA-N
• LogP: log Kow = 15.05 /Estimated/
• Exact Mass: 732.55866433
• Molecular Formula: C41H82O6P2
• Molecular Weight: 733.0
• SMILES: CCCCCCCCCCCCCCCCCCOP1OCC2(CO1)COP(OC2)OCCCCCCCCCCCCCCCCCC
• Topological: 55.4
• Monoisotopic Mass: 732.55866433
• Physical Description: Pellets or Large Crystals; Liquid
• Melting Point: 37-46 °C /Measured/
• Vapor Pressure: 8X10-17 mm Hg at 25 °C /Estimated/
• Henry’s Law Constant: Henry’s Law constant = 2.6X10-5 atm cu-m/mole at 25 °C /Estimated/
• Synonyms: 3806-34-6, O,O’-Dioctadecylpentaerythritol bis(phosphite), Distearyl pentaerythritol diphosphite, HSDB 7257, UNII-VYL51769RX, VYL51769RX, ANTIOXIDANT 118, EINECS 223-276-6, 2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis(octadecyloxy)-, DTXSID2027549, EC 223-276-6, pentaerythritol bis(stearyl phosphite), CYCLIC NEOPENTANETETRAYL BIS(OCTADECYL PHOSPHITE), DIOCTADECYL PENTAERYTHRITOL DIPHOSPHITE, DIOCTADECYL PENTAERYTHRITYL DIPHOSPHITE, 2,4,8,10-Tetraoxa-3,9-diphosphaspiro(5.5)undecane, 3,9-bis(octadecyloxy)-, DISTEARYL PENTAERYTHRITOL DIPHOSPHITE [HSDB], PHOSPHOROUS ACID, CYCLIC NEOPENTANETETRAYL DIOCTADECYL ESTER, DTXCID507549, O,O’Dioctadecylpentaerythritol bis(phosphite), 2,4,8,10-tetraoxa-3,9-diphosphaspiro(5.5)undecane,3,9-bis(octadecyloxy)-, 2,4,8,10Tetraoxa3,9diphosphaspiro(5.5)undecane, 3,9bis(octadecyloxy), 3,9-Bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-dioctadecoxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, o,o-dioctadecylpentaerythritol bis(phosphite), MFCD00071522, SCHEMBL86221, SCHEMBL311594, PZRWFKGUFWPFID-FTPXMZOVSA-N, AKOS015903437, di-stearyl-pentaerythrityl-di-phosphite, FD10471, 98% Carbon 64.8-69.5 %, CS-0435426, NS00007162, Q27292101, 2,2′-bis(octadecyloxy)-5,5′-spirobi(1,3,2-dioxaphosphinane), Plastic additive 14, European Pharmacopoeia (EP) Reference Standard, 2,4,8,10-TETRAOXA-3,9-DIPHOSPHASPIRO(5.5)UNDECANE, 3,9- BIS(OCTADECYLOXY)-, 3,9-Bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, reagent grade, 223-276-6

Application

Distearyl pentaerythritol diphosphite serves as a highly effective secondary antioxidant in polymer formulations, particularly for stabilizing polypropylene and polyethylene against thermal degradation during processing. It functions as a peroxide decomposer, converting hydroperoxides into non-radical products while minimizing color formation. The compound finds particular utility in high-temperature extrusion processes and outdoor applications where long-term oxidative stability is required. Its non-discoloring characteristics make it suitable for clear and white polymer formulations.

Safety and Hazards

GHS Hazard Statements

• H340 (14.3%): May cause genetic defects [Danger Germ cell mutagenicity]
• H360 (14.3%): May damage fertility or the unborn child [Danger Reproductive toxicity]
• H413 (43.6%): May cause long lasting harmful effects to aquatic life [Hazardous to the aquatic environment, long-term hazard]

Precautionary Statements

• P203, P273, P280, P318, P405, and P501

Hazard Classes and Categories

• Muta. 1B (14.3%)
• Repr. 1B (14.3%)
• Aquatic Chronic 4 (43.6%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.