Term: volume solids

Volume solids refer to the percentage of a paint's volume that remains on a surface after it dries, once all the solvents or water have evaporated. It represents the actual solid components—such as pigments, binders, and additives—that form the protective and decorative film on the substrate.

In practical terms:

• If a paint has 50% volume solids, then half of the applied wet film thickness will remain as dry film after curing.
• For example, applying 100 microns (µm) of wet paint with 50% volume solids will result in a 50 µm dry film thickness (DFT).

Why it matters:

• Coverage rates: Higher volume solids mean more material stays on the surface, improving coverage and durability.
• Cost-effectiveness: Paints with higher volume solids may offer better value, even if they cost more upfront.
• Specification compliance: In professional painting (especially commercial or industrial), volume solids are critical for meeting specified DFT requirements.

Common in:

• Technical data sheets (TDS) of paints.
• Estimating paint quantities for projects.
• Comparing product performance across brands.

Example:
A premium acrylic exterior paint might have volume solids of 42%, while a high-performance epoxy coating could have volume solids of 70–100%.