Chemical Strengthening for Ultra-Thin Glass (<2mm)In modern electronics, precision display, and specialized encapsulation, ultra-thin glass (<2mm, especially 1.6mm) requires two critical performance factors: maximum impact resistance and absolute surface flatness.
For sub-2mm glass, Chemical Strengthening (Ion Exchange Method) is the definitive manufacturing solution.
Why Chemical Strengthening Beats Physical Tempering Physical tempering relies on high-pressure air cooling. On glass under 2mm, this process fails due to two main reasons:
1. Thermal Distortion: High-pressure air quenching warps ultra-thin sheets.
2. Insufficient Temperature Gradient: Thin glass cannot build the necessary internal-to-surface temperature difference, resulting in low stress or glass breakage.
Chemical Strengthening immerses glass in a 400°C to 450°C bath. Larger potassium ions replace smaller sodium ions on the glass surface, creating a dense Compressive Stress (CS) layer. Because it occurs below the softening point in a static bath, the glass maintains 100% flatness with zero optical distortion.
