Product Overview
Liquid polysulfide rubber (CAS 68611-50-7) is a high-purity, 100% solids liquid polymer with terminal thiol (-SH) functional groups. This versatile polymer cures at room temperature via oxidation of thiol groups to form a flexible, resilient elastomer without requiring solvents or diluents.
Liquid Polysulfide Rubber(CAS 68611-50-7) exhibits excellent oil resistance, gas tightness, and low-temperature flexibility. Its molecular structure contains disulfide linkages in the main chain, providing outstanding chemical resistance and long-term durability. The polymer is compatible with various fillers, plasticizers, and curing agents, allowing formulation flexibility for specific application requirements.
China manufacturer direct. High purity. COA and SDS available with every shipment. 250kg drums.
Key Features
- Room Temperature Curing: Cures via oxidation of thiol groups without heat or solvents
- Excellent Oil & Fuel Resistance: Outstanding resistance to oils, fuels, and hydrocarbons
- Gas Tightness: Low gas permeability, ideal for insulating glass and aerospace applications
- Low-Temperature Flexibility: Remains flexible at temperatures down to -55°C
- Strong Adhesion: Bonds well to glass, aluminum, steel, concrete, wood, and many plastics
- Durable & Weather-Resistant: Excellent resistance to ozone, UV, and weathering
- China Manufacturer: Factory direct pricing, 250kg drum supply
Applications
Insulating Glass Sealants: Liquid polysulfide rubber is a primary raw material for two-component insulating glass sealants, providing excellent gas retention and moisture vapor barrier properties. Widely used in energy-efficient window manufacturing.
Building & Construction Sealants: Used in waterproof and airtight seals for buildings, bridges, underground structures, and water treatment facilities. Provides durable, flexible seals for moderate movement joints.
Aerospace & Aviation: Used in fuel tank sealants and aircraft structural seals, offering excellent resistance to jet fuel, hydraulic fluids, and extreme temperature variations.
Marine & Shipbuilding: Applied in ship deck sealants, hull seals, and underwater construction joints, providing superior water resistance and durability in harsh marine environments.
Automotive & Transportation: Used in automotive sealants, gaskets, and vibration-damping applications.
Anti-Corrosion Coatings: Formulated into chemical-resistant coatings for industrial equipment, pipelines, and storage tanks.
Product Specifications
| Parameter | Specification |
|---|---|
| Product Name | Liquid Polysulfide Rubber (CAS 68611-50-7) |
| CAS Number | 68611-50-7 |
| Molecular Weight | ~4,000 |
| Appearance | Brownish to red-brown transparent viscous liquid |
| Purity | ≥99% |
| Viscosity (25°C) | 350-450 poises (41-48 Pa·s) |
| Mercaptan (-SH) Content | 1.7-2.2% |
| Moisture Content | ≤0.3% |
| Color (Hellige) | ≤11 |
| pH (Extract) | 6.0-8.0 |
| Crosslinking Agent | 2.0 mol-% trifunctional groups |
| Packaging | 250kg drums |
| Documents | COA, SDS available |
Liquid Polysulfide Rubber vs Other Polysulfide Grades
| Property | Liquid Polysulfide Rubber | AL-32 | AL-33 |
|---|---|---|---|
| Molecular Weight | ~4,000 | ~4,000 | ~4,000 |
| Viscosity (25°C) | 350-450 poises | ~320 poises | Lower |
| Mercaptan Content | 1.7-2.2% | Higher | Higher |
| Crosslinking Density | 2.0 mol% | 2.0 mol% | 2.0 mol% |
| Typical Applications | General sealants, adhesives | Aerospace fuel tank sealants | Flexible coatings |
Manufacturing & Quality Control
Alfa Industry operates a dedicated R&D center and manufacturing facility staffed by experienced polymer chemists with expertise in liquid polysulfide synthesis and quality control. Every batch of liquid polysulfide rubber is manufactured under documented SOPs and validated to ensure molecular weight, viscosity, mercaptan content, and purity meet specifications.
Each shipment is accompanied by a Certificate of Analysis (COA) showing actual molecular weight, viscosity, mercaptan content, moisture content, and other quality parameters.
Packaging & Shipping
Packaging Options: 250kg drums (custom packaging available upon request)
Shipping Methods: International express courier for sample quantities; air freight or sea freight for bulk orders
Delivery Time: 3-7 business days after payment confirmation
Documentation: COA (Certificate of Analysis) and SDS (Safety Data Sheet) provided with every shipment
Why Choose Alfa Industry
- 15+ years focused on specialty polymers and sealant raw materials
- Experienced R&D team with expertise in polysulfide polymer synthesis
- In-house QC - Viscosity, molecular weight, and mercaptan content verified
- Flexible supply - 250kg drums to bulk orders
- Consistent quality - ISO-compliant manufacturing with batch-traceable COA
Frequently Asked Questions
What is the difference between Liquid Polysulfide Rubber(CAS 68611-50-7) and other polysulfide grades?
Liquid Polysulfide Rubber(CAS 68611-50-7) has a molecular weight of ~4,000 and a viscosity of 350-450 poises, making it suitable for general sealant and adhesive applications. LP-32 is typically used for aerospace fuel tank sealants, and LP-33 is used for flexible coatings.
How does Liquid Polysulfide Rubber(CAS 68611-50-7) cure?
Liquid Polysulfide Rubber(CAS 68611-50-7) cures at room temperature via oxidation of terminal thiol (-SH) groups using an oxidizing agent (such as lead dioxide, manganese dioxide, or organic peroxides). The curing reaction forms a flexible, resilient elastomer without requiring heat or solvents.
What are the typical applications of Liquid Polysulfide Rubber(CAS 68611-50-7)?
Liquid Polysulfide Rubber(CAS 68611-50-7) is primarily used in insulating glass sealants, building sealants, aerospace fuel tank sealants, marine sealants, automotive sealants, and anti-corrosion coatings.
What is the recommended curing agent for Liquid Polysulfide Rubber(CAS 68611-50-7)?
Manganese dioxide (MnO₂) is commonly used as a curing agent at a recommended ratio of 5.7-6.3g per 100g of Liquid Polysulfide Rubber(CAS 68611-50-7)[reference:0][reference:1].
How should Liquid Polysulfide Rubber(CAS 68611-50-7) be stored?
Store in a cool, dry place in sealed containers. Avoid moisture and direct sunlight. Shelf life is 24 months under proper storage conditions.
Do you provide COA and SDS?
Yes, COA and SDS are provided with every shipment. Batch-specific documents are available upon request.
Related Products
Looking for similar polysulfide polymers or sealant raw materials? Browse our Material Chemicals category for more polysulfide grades, curing agents, and specialty polymers - or contact us with your specific viscosity and mercaptan content requirements.
Contact Us for Custom Packaging or Bulk Pricing
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