Selecting the right colorant is more than just choosing a shade- it’s about ensuring performance, durability, and brand recognition. A colorant is any substance that modifies the color of an object by altering its spectral transmittance or reflectance. But what factors determine the best choice for a masterbatch formulation? Understanding the differences between pigments, dyes, and classifications like organic vs. inorganic and how they relate to the plastics industry can help ensure the best results for your application

Types of Colorants: Pigments vs. Dyes

Let’s first discuss colorant classification and then consider the selection process for colored masterbatch formulating. Most recognize that colorants are classified as a pigment or a dye. Pigments are insoluble crystals that must be dispersed into the polymer. Think of pigments like sand in water- an insoluble solid that remains suspended rather than dissolving.

Dyes, on the other hand, are soluble in the polymer, chemically bond to the material they color, and could easily migrate if improperly used. Dyes typically have high tinting strength and excellent clarity.

Organic vs. Inorganic Colorants

Colorants are also classified as either organic or inorganic. In layman’s terms, organic colorants are made from carbon rings and chains, while inorganics are developed from natural minerals. Overall, organic colorants are smaller in particle size, more transparent, less stable to sunlight and chemicals, have higher chroma, and take more energy to disperse. Inorganic colorants are generally larger in particle size, more opaque, more resistant to outdoor conditions and chemicals, have low chroma, and take less energy to disperse. Color masterbatch can be comprised solely of organic colorants, inorganic colorants, or a combination of both, depending on the intended use of the finished article.

Understanding Hue, Chroma, and Value

Hue, chroma, and value are industry terms that define or describe a specific color.

• Hue is commonly referred to as color (yellow, red, green, etc.). It is dependent on its dominant wavelength, which is independent of lightness or intensity.
• Chroma is defined as the strength or dominance of the hue, which some describe as the color’s dullness or intensity.
• Value is defined as the lightness or darkness of a color. A high value indicates a light color, while a low value designates a darker color.

Choosing the Right Colorant for Your Application

Choosing the right colorant is essential for ensuring a product meets industry demands. Proper selection ensures both performance and aesthetics, whether it’s the durability required for construction materials, the iconic branding of consumer goods, or the regulatory compliance needed for food packaging.

Colortech has an experienced staff of color-matching experts who custom blend colorants to match your desired hue. Colorants have varying degrees of heat resistance, light fastness, weather stability, chemical resistance, and regulatory compliance.

Reach out to a Colortech representative today or fill out the form below to start the process of choosing the proper colorants for use in masterbatch creation, which is essential to product development success. We're here to help!