In coating R&D, formulation and application, solids content is a core parameter on TDS, used to estimate film-forming substances, calculate theoretical film thickness, and determine VOC. However, it is not an inherent constant of the material but a functional parameter under specific test conditions.
    Coating raw materials marked with solids content mainly include solvent-based resins, water-based resins and emulsions, UV resins, etc. Whether to mark it depends on whether it can provide effective information for formula calculation or application judgment. The test logic for solids content varies significantly among different materials: solvent-based resins often use the oven weight loss method at 105–125℃ to balance solvent removal and resin stability; the solids content of water-based systems refers to the total amount of non-volatile components, not the pure polymer content in the final film; the "100% solids content" of UV resins is a structural description, not suitable for conventional verification; the solids content of curing agents focuses on formula calculation, while the solids content of water-based additives is often approximated as active ingredients.
    Understanding the test conditions and application scenarios of solids content is crucial to making this parameter truly serve coating R&D and production.

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