Overview
Titanium Dioxide for Rubber is a high-performance pigment engineered specifically for rubber compounding. It serves as a critical additive to enhance opacity, UV protection, and mechanical strength in rubber products. Unlike general-purpose TiO2, this grade is optimized for compatibility with rubber polymers, ensuring uniform dispersion and long-term stability. Rubber-grade TiO2 is typically surface-treated to improve bonding with rubber matrices, preventing agglomeration during processing. Its role extends beyond coloration, as it significantly improves product lifespan by mitigating degradation from sunlight and oxidation.
Physical and Chemical Properties
This specialized TiO2 exhibits a rutile crystal structure, preferred for its superior light-scattering efficiency and thermal stability. Its high refractive index (2.7) ensures exceptional opacity even at low loading levels (typically 1–5% in rubber formulations). The powder’s particle size is tightly controlled to balance reinforcing effects and processability. Chemically inert, it does not react with rubber vulcanization systems. However, surface treatments like alumina or silica coatings may be applied to tailor its interaction with specific rubber types (e.g., EPDM or SBR). Its insolubility guarantees no leaching during product use.
Main Applications
In tire manufacturing, TiO2 improves sidewall whiteness and resists yellowing from ozone exposure. It is equally vital for non-tire applications such as rubber hoses, conveyor belts, and footwear soles, where durability under outdoor conditions is paramount. The automotive sector relies on it for weather-resistant seals and gaskets. Industrial rubber products like tank linings benefit from its corrosion-inhibiting properties. Emerging uses include colored rubber goods, where TiO2 acts as a base for vibrant, fade-resistant shades.
Safety and Storage
While TiO2 is generally low-risk, inhalation of fine powder should be avoided. NFPA ratings classify it as Health Hazard 1 (slight). Storage requires moisture-proof packaging, as humidity may affect flowability. Bulk bags or lined containers are recommended. Workplace handling should include dust masks (NIOSH N95 or equivalent) and ventilation. Spills can be swept up without specialized cleanup procedures. Note that some surface-treated variants may have specific SDS guidelines depending on coating chemistry.
B2B Procurement Guide
Procurement should prioritize suppliers with rubber industry expertise, as generic TiO2 may lack critical optimizations. Key specifications to request include: oil absorption value (target <20 g/100g), pH (6.5–8.5), and residue on 325 mesh sieve (<0.1%). For large-scale orders, negotiate pricing based on annual volume commitments. Testing small batches for dispersion quality in your specific rubber compound is advisable. Leading manufacturers include Chemours, Kronos, and Tronox, with regional suppliers in Asia offering cost-competitive alternatives.
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