Solid Content
Definition
Proportion of solid components in adhesive, affecting coating weight and drying time.
Historical Background
1950s: oven-drying weighing method became the standard test.
Example
50% solids leaves half thickness after drying; 30% leaves one-third. Like real ingredient ratio.
Formula
Solids Content (%) = Dried Mass / Wet Mass x 100%
Core Concepts
Efficiency indicator: high solids means thicker dried layer at same coating weight.
Extended Applications
Solvent-based: 30-50%; water-based: 40-60%; solvent-free: 95-100%; hot-melt/UV: 100%.