In modern elastomer compounding, latex processing, and light-colored polymer manufacturing, preserving aesthetic whiteness while defending against premature thermal degradation is essential. Rubber Antioxidant SP (chemically known as Styrenated Phenol) stands globally as a premier non-staining hindered phenolic antioxidant. Registered under CAS No. 61788-44-1, Antioxidant SP consists of a carefully balanced mixture of mono-, di-, and tri-(alpha-methylbenzyl) phenols. Unlike amine-based antioxidants that cause severe dark staining upon UV or heat exposure, Antioxidant SP remains completely non-discoloring and non-migrating, making it the standard protective additive for light-colored vulcanizates, synthetic rubber stabilization, and natural or synthetic latex emulsions.
Technical Product Specifications
| Property / Parameter | Liquid Grade (SP) | Powder Grade (SP-P / SP-C) |
|---|---|---|
| Chemical Name | Styrenated Phenol (Mixture of mono-, di-, and tri-styrenated phenols) | |
| CAS Number | 61788-44-1 | |
| Appearance | Light yellow to amber viscous transparent liquid | White to off-white free-flowing silica-supported powder |
| Specific Gravity at 25°C | 1.07 – 1.09 g/cm³ | 1.25 – 1.35 g/cm³ |
| Refractive Index (nD25) | 1.595 – 1.608 | N/A (Active SP content: 65% – 70%) |
| Heating Loss / Moisture (%) | ≤ 0.50% | ≤ 1.00% |
| Ash Content (%) | ≤ 0.10% | 28.0% – 33.0% (Inert mineral carrier) |
| Flash Point (Open Cup) | ≥ 180 °C | ≥ 180 °C |
Why Choose Our Antioxidant SP?
- ✓ Completely Non-Staining & Non-Discoloring: Preserves the original color vibrancy of white, pastel, and translucent rubber goods without yellowing under sunlight or migrating into adjacent painted or plastic surfaces.
- ✓ Low Volatility & Excellent Polymer Compatibility: Due to its high-molecular-weight di- and tri-styrenated phenol fractions, Antioxidant SP resists evaporation during high-temperature compounding and vulcanization, ensuring sustained protection.
- ✓ Easy Emulsification & Zero Cure Interference: Readily disperses into aqueous surfactant emulsions for natural and synthetic latex dipping without destabilizing colloidal systems or altering sulfur vulcanization rates.
Primary Applications
Antioxidant SP is extensively formulated into Natural Rubber (NR), Styrene-Butadiene Rubber (SBR), Butadiene Rubber (BR), Nitrile Rubber (NBR), EPDM, and aqueous latex dispersions:
White & Colored Rubber Products
An ideal non-staining stabilizer for white tire sidewalls, colorful athletic footwear outsoles, bath mats, rubber flooring, and household elastomer articles.
Natural & Synthetic Latex Goods
Widely emulsified into latex foams, mattresses, dipped medical and household gloves, balloons, and carpet backing compounds to prevent oxidative brittleness.
Raw Synthetic Rubber & Adhesives
Used as a non-discoloring finishing stabilizer during the coagulation and drying of raw SBR/NBR polymers, as well as in hot-melt and pressure-sensitive adhesives.
Quality Assurance & Global Compliance
As a leading global partner in industrial chemical manufacturing, we understand that raw material purity, molecular consistency, and strict regulatory tracking directly safeguard your production line metrics. Our advanced manufacturing facilities maintain rigorous quality configurations to ensure total compliance and confidence across all international markets:
- Advanced Laboratory Quality Control: Every commercial batch of our Antioxidant SP undergoes exhaustive analytical verification—including gas chromatography (GC) for mono-, di-, and tri-styrenated phenol isomer ratios, refractive index checking, and free phenol screening—ensuring consistent anti-aging performance and zero discoloration.
- Comprehensive International Regulatory Compliance: We maintain a highly proactive approach to global chemical governance. All export shipments are systematically backed by complete regulatory documentation, including up-to-date, comprehensive multilingual GHS Safety Data Sheets (SDS), detailed Certificates of Analysis (CoA), and official tracking credentials fully matching EU REACH and US TSCA parameters.
- Flexible Packaging & Physical Formats: To fit diverse factory dosing workflows, we supply pure liquid Antioxidant SP in galvanized steel drums (200kg) or IBC totes (1000kg), alongside silica-supported free-flowing powder grades (SP-P) in 25kg multi-wall moisture-resistant kraft bags for direct dry-mill compounding.
⚠ Storage & Handling Guidelines
Maintaining correct climate-controlled conditions is essential to protect the color stability and active purity of Antioxidant SP. While chemically stable under normal conditions, prolonged exposure to intense heat, open air, or strong oxidizers can gradually darken liquid color indices.
- • Warehouse Climate Controls: Store drums and bags inside a completely dry, cool, and well-ventilated dedicated warehouse. Keep storage areas isolated from direct sunlight, open flames, steam pipes, and strong oxidizing chemicals.
- • Container Sealing & Viscosity Handling: Keep drum bungs and powder bags tightly sealed when not actively dispensing to prevent moisture uptake. Note that liquid Antioxidant SP becomes more viscous in cold winter temperatures; gentle warming below 45°C restores easy pumping flow without harming quality.
- • Shelf Life & Rotation: Under appropriate cool, shaded warehouse storage, our premium Antioxidant SP exhibits a certified shelf life of 12 to 24 months from the date of manufacture. A strict First-In, First-Out (FIFO) inventory rotation cycle is recommended.
Frequently Asked Questions
Should I choose Liquid Antioxidant SP or Powder Grade (SP-P) for my production line? +
How is Antioxidant SP prepared for natural or synthetic latex compounding? +
Can Antioxidant SP be combined with secondary stabilizers like MMB or phosphites? +
What is the recommended dosage range for Antioxidant SP? +
Partner with a Reliable Chemical Supplier
We provide premium-grade Rubber Antioxidant SP carefully refined to deliver non-staining, long-term thermal and oxidative protection. Available in pure viscous liquid drums and free-flowing silica-supported powder grades to integrate seamlessly into your rubber or latex production workflows.
