Description

Stearoyl Peroxide is a high-purity organic peroxide compound, widely recognized for its role as a polymerization initiator and cross-linking agent. Its controlled decomposition properties are critical for initiating free-radical reactions in polymer synthesis, ensuring consistent and predictable process outcomes. This makes it an essential raw material for manufacturers in the polymer, plastics, and specialty chemical industries seeking reliable initiator performance.

Application

• Primary initiator for the polymerization of ethylene, styrene, and (meth)acrylate monomers.
• Key component in the production of low-density polyethylene (LDPE) and expandable polystyrene (EPS).
• Used as a cross-linking agent for silicone rubbers and polyethylene to enhance thermal and mechanical properties.
• Employed in the curing and hardening processes for unsaturated polyester resins.
• Acts as a modifier for polypropylene to control molecular weight and rheology.
• Utilized in the synthesis of specialty polymers and block copolymers.
• Applied in controlled radical polymerization techniques for advanced material development.

Basic Information

Product Name	Stearoyl Peroxide
CAS No.	3273-75-4
Molecular Formula	C36H70O4
Molecular Weight	566.94 g/mol
Synonyms	Distearoyl Peroxide; Stearic Acid Peroxide; Di(octadecanoyl) Peroxide; Octadecanoyl Peroxide; Peroxide, bis(1-oxooctadecyl); Lauroyl Peroxide (related higher homologue); LP (initiator grade designation); Polymerization Initiator LP
EINECS	221-891-1

Quality Control

Our Stearoyl Peroxide is manufactured under strict quality management systems to ensure batch-to-batch consistency and reliability. The product undergoes comprehensive analytical testing, including assay, active oxygen content, and impurity profile analysis. A Certificate of Analysis (COA) documenting purity, peroxide value, and other critical parameters is provided with each shipment to guarantee it meets your specific application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area away from heat, sparks, and open flames. Maintain storage temperature between 15°C and 25°C (59°F and 77°F). Keep away from incompatible materials such as reducing agents, strong acids, bases, and metals. Isolate from other stored chemicals.

Specification

Item	Specification
Appearance	White to off-white powder or flakes
Identification (IR)	Conforms
Assay (Active Oxygen)	≥ 98.0 %
Melting Point	50 - 55 °C
Acid Value	≤ 1.0 mg KOH/g
Moisture (KF)	≤ 0.5 %
Residue on Ignition	≤ 0.1 %

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