Description

Insoluble Sulfur is a high-purity, polymeric form of sulfur that remains insoluble in carbon disulfide, distinguishing it from ordinary rhombic sulfur. This unique property is critical for its primary role as a non-blooming vulcanizing agent in the rubber industry, ensuring superior product quality and performance. It is an essential raw material for manufacturers of high-grade tires, conveyor belts, hoses, and other rubber goods requiring excellent cross-linking and durability.

Application

• Rubber Vulcanization: Primary use as a non-migratory vulcanizing agent to prevent sulfur bloom in rubber compounds, ensuring uniform cross-linking and improved surface quality.
• Tire Manufacturing: Critical component in the production of radial tires, off-road tires, and other high-performance tires for enhanced durability, heat resistance, and aging properties.
• Industrial Rubber Goods: Used in the production of conveyor belts, hoses, seals, gaskets, and rubber rollers where dimensional stability and resistance to migration are paramount.
• Wire & Cable Insulation: Employed in rubber insulation and sheathing compounds to maintain electrical properties and prevent surface contamination.
• Footwear & Sporting Goods: Incorporated into rubber soles, athletic equipment, and other molded rubber products for consistent curing and finish.
• Adhesives and Sealants: Functions as a cross-linking agent in certain specialty rubber-based adhesive formulations.

Basic Information

Product Name	Insoluble Sulfur
CAS No.	9035-99-8
Molecular Formula	Sn (Polymeric)
Molecular Weight	Varies (Polymeric)
Synonyms	Polymeric Sulfur; Omega Sulfur; μ-Sulfur; High-Polymer Sulfur; Vulcanizing Agent IS; Insoluble Sulfur OT20; Insoluble Sulfur HD OT20; Crystex; Rhenogran IS; Non-blooming Sulfur
EINECS	Contact for details

Quality Control

Our Insoluble Sulfur is manufactured under strict quality management systems to ensure batch-to-batch consistency and performance. Key parameters such as insoluble sulfur content, oil content, acidity, and ash content are rigorously tested. Certificates of Analysis (COA) documenting purity and physical specifications are available for every shipment to support your quality assurance protocols.

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). Keep away from heat sources, open flames, and incompatible materials. This product is hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent caking and degradation.

Specification

Item	Specification
Appearance	Yellowish powder
Insoluble Sulfur Content	≥ 90.0%
Oil Content	≤ 10.0%
Acidity (as H2SO4)	≤ 0.05%
Ash Content	≤ 0.30%
Heat Loss (at 60°C)	≤ 0.50%
Sieve Residue (150μm)	≤ 0.10%

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