Surface Compression Stress Verification (Polariscope)

Inspection template for recording non-destructive surface compression stress readings on tempered glass using a scattered-light polariscope or GASP to verify tempering level and support ASTM C1048 conformance.

Inspection Details

• Inspection date and time recorded
• Inspector name and qualification documented
• Lot, job, or lite identification recorded
• Inspection purpose identified

Instrument Setup and Calibration

• Polariscope or GASP instrument identified
• Instrument calibration or verification status current
• Instrument zero or baseline check completed before readings
• Ambient lighting and viewing conditions suitable for scattered-light measurement
• Reference standard or verification sample used, if applicable

Glass Identification and Surface Condition

• Glass type confirmed as tempered lite
• Lite dimensions recorded
• Surface condition acceptable for reading
  Confirm the surface is clean enough to obtain a reliable compression reading and is free of contamination that would obscure the scattered-light pattern.
• Visible damage, edge chips, or scratches noted
• Coatings, frit, or surface treatments identified

Surface Compression Readings

• Measurement locations defined and recorded
  Record where readings were taken, such as center, quarter points, or specified test locations.
• Surface compression reading 1
• Surface compression reading 2
• Surface compression reading 3
• Average surface compression calculated
• Readings are consistent across measurement points
  Use this to note whether the measured values are within the expected variation for the product specification or internal control limits.

Conformance and Disposition

• Measured surface compression meets specification
• ASTM C1048 conformance supported by inspection record
• Non-conformance or hold disposition assigned if required
• Corrective action or follow-up documented

Closeout and Attestation

• Inspector signature
• Supervisor or QA review completed, if required