Overview
Black and white masterbatch is a pre-dispersed pigment concentrate used to color plastic products uniformly. It consists of high-load pigments (carbon black for black, titanium dioxide for white) embedded in a carrier resin, typically polyethylene or polypropylene. The masterbatch format ensures consistent coloration while simplifying production compared to raw pigment handling. This additive is widely adopted in plastic manufacturing due to its cost-effectiveness and processing advantages. It eliminates pigment dust issues and improves dispersion quality in final products. Masterbatches are available in different concentrations, typically ranging from 20% to 50% pigment content by weight.
Physical and Chemical Properties
Black masterbatch primarily contains carbon black pigments, offering excellent UV resistance and opacity. The white variant uses titanium dioxide (TiO2), providing brightness and maximum reflectivity. Both types exhibit good thermal stability up to 300°C, making them suitable for most plastic processing methods. The carrier resin determines many processing characteristics. Polyethylene-based masterbatches melt at 105-130°C, while polypropylene carriers require 160-170°C. Particle size typically ranges from 2-4mm for easy handling and uniform melting. Masterbatches show negligible volatility below 200°C and maintain stable color properties under normal processing conditions.
Main Applications
In packaging, black masterbatch creates UV-protective films and opaque containers, while white masterbatch produces bright food packaging and medical equipment. The automotive industry uses both for interior trim, dashboards, and exterior components requiring weatherability. Construction applications include piping (black for UV resistance, white for visual cleanliness) and insulation materials. Consumer goods like appliances, toys, and household items extensively utilize these colorants. White masterbatch is particularly important for achieving food-contact compliance in kitchenware and disposable containers.
Safety and Storage
Masterbatches are generally safe at room temperature but require proper ventilation during high-temperature processing to avoid fume inhalation. Carbon black in black masterbatch is classified as possibly carcinogenic (IARC Group 2B) in powder form, but the encapsulated form in masterbatch significantly reduces exposure risk. Storage should maintain product integrity - keep sealed in original packaging at <30°C with <60% humidity. Avoid contamination from moisture or other chemicals. Shelf life typically exceeds 12 months when stored properly. Fire precautions include using dry chemical extinguishers for resin fires and preventing dust accumulation.
B2B Procurement Guide
Quality verification should include testing for color strength (measured by spectrophotometer), dispersion quality (microscopic examination), and thermal stability (through melt flow index tests). Request certificates of analysis for heavy metal content and food-grade compliance if applicable. For large-volume purchases, negotiate pricing based on annual commitment volumes. Consider regional suppliers to reduce logistics costs, but verify their consistency across batches. Sample testing in your specific production process is essential before bulk orders. Preferred payment terms often include 30-60 day credit for established buyers with letters of credit for international transactions.
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