Overview
Extrusion white masterbatch is a pre-dispersed pigment concentrate primarily containing titanium dioxide (TiO2) in a polymer carrier. It is designed for uniform coloration and opacity enhancement in extrusion processes like blown film, sheet extrusion, and pipe production. The product eliminates the need for direct pigment handling, reducing dust contamination and ensuring consistent color dispersion. Its formulation is tailored for specific polymers like LDPE, HDPE, PP, or PVC, with TiO2 concentrations typically ranging from 20% to 80% depending on application requirements.
Physical and Chemical Properties
The masterbatch exhibits excellent thermal stability to withstand extrusion temperatures up to 300°C. Its whiteness index typically exceeds 90% (measured by ISO 2470), with particle sizes under 10μm for optimal dispersion. Key performance metrics include melt flow rate (MFR) matching the base resin, low volatile content (<0.5%), and superior lightfastness (7-8 on the Blue Scale). The carrier resin's properties determine compatibility – polyolefin-based variants dominate the market due to their broad applicability.
Main Applications
Primary applications include food packaging films requiring high opacity, white PVC pipes for construction, and disposable medical products needing sterilization compatibility. The masterbatch is also used in synthetic paper, plastic furniture, and automotive interior components. In multilayer films, it's often applied in the core layer to reduce TiO2 usage while maintaining opacity. Recent innovations include anti-counterfeiting masterbatches with unique spectral signatures for brand protection applications.
Safety and Storage
While generally safe, TiO2 dust inhalation should be avoided. EU classification (2020) designates TiO2 as a suspected carcinogen (Category 2) by inhalation under specific conditions. Proper ventilation and dust masks are recommended during bulk handling. Storage requires moisture-proof packaging (typically 25kg bags with inner PE lining) and stable temperatures below 40°C. Shelf life is typically 12-24 months. Avoid mixing with other masterbatches unless compatibility is verified to prevent cross-contamination.
B2B Procurement Guide
Industrial buyers should specify: TiO2 content (e.g., 50% or 70%), carrier resin type (must match base polymer), and processing parameters. Request technical datasheets with CIELAB values, MFR data, and FDA/EC compliance certificates where applicable. Sample testing is crucial – evaluate dispersion quality under production conditions. Consider suppliers with in-house dispersion technology and batch-to-batch consistency guarantees. For large orders (20+ tons), negotiate based on TiO2 market price trends, as it constitutes 60-80% of the product cost.
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