To determine whether the thickness of tempered glass meets standards, one must primarily reference the latest national standard requirements and employ a multi-dimensional verification approach-combining physical measurements with qualification checks. The specific methods are as follows:
Clarify the Permissible Thickness Deviations Under National Standards
According to the new standard GB/T 15763.2-2025 (effective August 1, 2026), the permissible deviation ranges for various thickness specifications have been tightened:
2mm ≤ t < 3mm: Deviation ±0.15mm
3mm, 4mm: Deviation tightened from the previous ±0.20mm to ±0.15mm
8mm, 10mm: Deviation remains unchanged at ±0.3mm
12mm: Deviation tightened from the previous ±0.40mm to ±0.3mm
15mm, 19mm: Deviations tightened to ±0.5mm
>19mm: Deviation standardized at ±1.00mm
Simple assessment logic: For tempered glass with a nominal thickness of 5mm, any measured thickness below 4.85mm classifies it as a non-compliant product.
Methods for Measuring Actual Thickness
Simple home verification: Use a digital caliper with 0.01mm precision to measure various points along the four edges of the glass. Compare the minimum measured value against the nominal thickness to confirm the deviation falls within the limits allowed by the national standard.
Professional non-destructive testing: Use a specialized tempered glass thickness gauge. This allows for non-contact measurement across all points with a resolution of up to 0.001mm, preventing surface scratches associated with contact-based measurement methods.
Supplementary verification: Factory inspection reports for legitimate products clearly state the actual measured thickness values; you can directly cross-reference the report data with on-site measurements to ensure consistency.