Description

3,9-Bis[2-(Dodecylthio)Ethyl]-2,4,8,10-Tetraoxaspiro[5.5]Undecane is a high-performance, sulfur-containing spirocyclic acetal compound, CAS number 26505-37-3, valued for its role as a multifunctional additive. It matters to formulators seeking to enhance the thermal stability, antioxidant properties, and processing characteristics of polymers and synthetic materials. This product is primarily needed by manufacturers in the plastics, rubber, and lubricant industries, where it acts as an effective stabilizer and modifier.

Application

• As a thermal stabilizer and antioxidant in polyolefins (e.g., PP, PE) and engineering plastics to prevent degradation during high-temperature processing and service.
• As a synergistic additive in combination with primary antioxidants (e.g., hindered phenols, phosphites) to enhance the overall stabilization package in polymer formulations.
• As a modifier and stabilizer in synthetic lubricants and greases to improve oxidative stability and extend service life.
• As a processing aid in rubber compounds, including SBR and EPDM, to protect against heat and shear-induced breakdown.
• As a functional additive in adhesive and sealant formulations to improve long-term aging resistance.
• As a stabilizing component in specialty coatings and films that require enhanced durability against thermal and oxidative stress.

Basic Information

Item	Detail
Product Name	3,9-Bis[2-(Dodecylthio)Ethyl]-2,4,8,10-Tetraoxaspiro[5.5]Undecane
CAS No.	26505-37-3
Molecular Formula	C37H72O4S2
Molecular Weight	645.1 g/mol
Synonyms	3,9-Bis(2-(dodecylthio)ethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane; Spiroacetal Thioether; Dodecylthio Spiroacetal; Antioxidant 26505-37-3; Thioether Spiro Compound; Bis(dodecylthioethyl) Spiroacetal; Polymer Stabilizer 26505-37-3
EINECS	Contact for details

Quality Control

Our production of 3,9-Bis[2-(Dodecylthio)Ethyl]-2,4,8,10-Tetraoxaspiro[5.5]Undecane adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including chromatography and spectroscopy, to ensure high purity and consistent performance. A comprehensive Certificate of Analysis (COA) detailing assay, identity, and impurity profiles is provided with each shipment to guarantee compliance with your specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. Under these conditions, the product remains stable for extended periods.

Specification

Item	Specification
Appearance	White to off-white powder or flakes
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	48 - 52 °C
Loss on Drying	≤ 0.5%
Sulfur Content	9.8 - 10.2 %

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