Introduction When manufacturers evaluate an infrared blocking material, they often begin with questions about optical performance: How much near-infrared radiation can it block? What visible-light transmission can be maintained? What happens to haze? How much additive is required? But there is another question that can be equally important: In what physical form should the infrared blocking material be supplied? For transparent films, coatings and polymer products, the same functional chemistry may be delivered as: Powder Liquid Dispersion or Masterbatch These three formats are not simply different packaging options. They place very different demands on: dispersion technology; solvent compatibility; resin compatibility;