Surface Compression Stress Verification (Polariscope)
Record surface compression readings on tempered glass with a scattered-light polariscope or GASP, then compare them to project requirements and ASTM C1048 conformance. Use it to document each lite, flag questionable readings, and decide pass, retest, or non-conformance.
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Overview
This template documents surface compression stress readings on tempered glass using a scattered-light polariscope or GASP. It captures the inspection header, sample identification, instrument setup and calibration, primary and replicate readings, average compression, acceptance criteria, and the final non-conformance or sign-off trail.
Use it when you need a repeatable record for incoming inspection, in-process verification, lot sampling, or a customer-specific acceptance check. It is especially useful when the reading itself matters as much as the pass/fail decision, such as confirming tempering level, investigating a suspect lite, or preserving evidence for a dispute. The form is built to support ASTM C1048 conformance documentation, but it should be paired with the actual project specification and any applicable customer requirements.
Do not use this as a substitute for destructive testing, process validation, or a broader quality audit. It is also not the right tool when the glass cannot be safely measured, when the instrument is out of calibration, or when the surface condition prevents a reliable reading. If the result is questionable, the template gives you space to record the issue, attach photo evidence, and route the lite for retest or non-conformance handling instead of forcing a premature acceptance decision.
Standards & compliance context
- The template supports quality records commonly used to demonstrate conformance with ASTM C1048 expectations for heat-treated glass.
- It fits an ISO 9001:2015-style document control and inspection workflow by preserving traceability, objective evidence, and disposition history.
- If your project has glazing, safety, or fire-life-safety requirements, use the form alongside the applicable product specification, building code, or AHJ direction rather than treating the reading alone as approval.
- Where customer or contract requirements define minimum surface compression, the acceptance section should reflect those values directly so the inspector can make a consistent disposition.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Inspection Header and Sample Identification
This section ties the reading to the exact lite, lot, and orientation so the result is traceable and repeatable.
- Inspection date and time recorded
- Inspector name and role documented
- Glass lite or sample ID recorded
- Lot, job, or order number recorded
- Glass type and nominal thickness documented
- Measurement location or orientation identified
Instrument Setup and Calibration
This section proves the polariscope or GASP was ready to produce a reliable reading before the inspection began.
- Instrument type selected
- Instrument identification and serial number recorded
- Calibration status verified within required interval
- Instrument optics and viewing surfaces clean and undamaged
- Ambient lighting and setup conditions suitable for reading
- Reference standard or verification check completed
Surface Compression Readings
This section captures the actual measurement values and the locations they came from, which is the core evidence of the inspection.
- Primary surface compression reading
- Secondary surface compression reading
- Additional reading or replicate value
- Average surface compression calculated
- Measurement location(s) documented for each reading
- Readings taken without damaging or breaking the lite
Acceptance Criteria and Compliance
This section turns the measured values into a clear conformance decision against the project requirement and ASTM C1048-related expectations.
- Measured surface compression meets project or specification requirement
- Result supports ASTM C1048 conformance
- Any out-of-specification or questionable reading identified
- Disposition selected
Non-Conformance, Corrective Action, and Sign-Off
This section records what happened when the result was questionable or failed and closes the loop with accountability.
- Deficiency or non-conformance description completed
- Corrective action or retest plan documented
- Photo evidence attached when reading is questionable or failed
- Inspector signature
How to use this template
- 1. Enter the inspection date, inspector name and role, glass lite ID, lot or order number, glass type, nominal thickness, and the exact measurement location or orientation.
- 2. Select the instrument type, record the instrument ID and serial number, confirm calibration status, and complete the reference standard or verification check before taking any readings.
- 3. Take the primary, secondary, and any replicate surface compression readings at the documented locations without damaging the lite, then calculate and record the average compression value.
- 4. Compare the measured average and individual readings against the project specification and ASTM C1048-related acceptance criteria, and mark any out-of-specification or questionable result.
- 5. If the result is unclear or failed, document the deficiency, assign the corrective action or retest plan, attach photo evidence, and complete the inspector sign-off.
Best practices
- Record the exact reading location on the lite, because surface compression can vary by area and a vague location weakens the result.
- Verify the polariscope or GASP calibration status before every inspection session, not after a questionable reading appears.
- Clean the instrument optics and viewing surfaces before use so dust, smudges, or scratches do not distort the fringe pattern or reading.
- Take replicate readings under the same setup conditions and note any spread between values instead of relying on a single number.
- Use photo evidence whenever a reading is borderline, inconsistent, or challenged, because visual context helps resolve disputes later.
- Separate acceptance criteria from the measured result so the inspector does not have to interpret the specification from memory.
- Stop and retest if ambient lighting, glare, or sample placement makes the reading unstable, since forcing a value can create a false pass.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What does this template verify?
It records non-destructive surface compression readings on tempered glass using a scattered-light polariscope or GASP. The form captures sample identification, instrument setup, replicate readings, average compression, and the final disposition. It is designed to support tempering-level verification and document whether the lite aligns with ASTM C1048 expectations or project-specific criteria.
When should I use a surface compression verification form?
Use it when you need to confirm the tempering condition of a glass lite before release, installation, or acceptance. It is especially useful for incoming inspection, fabrication QA, dispute resolution, and spot checks on production lots. It is not a substitute for destructive testing or a full process qualification study.
Who should complete this inspection?
A trained inspector, quality technician, or lab/production QA representative should complete it. The person running the test should understand the instrument, the reading method, and how to recognize questionable results caused by setup, surface condition, or sample geometry. If your organization requires a competent person or designated verifier, this template can capture that role in the header.
How often should these readings be taken?
Frequency depends on your quality plan, customer specification, and lot size. Many teams use it for each sampled lite, each production lot, or whenever a reading falls outside the expected range. If a reading is inconsistent, repeat the measurement at the same or a nearby documented location before deciding on disposition.
Does this template prove ASTM C1048 compliance by itself?
No. It helps document the readings and the inspection trail that support a conformance decision, but compliance still depends on the full product specification, the applicable test method, and any customer requirements. Use the template to record the evidence, not as a standalone legal certification.
What are the most common mistakes when using a polariscope inspection form?
Common mistakes include missing glass identification, failing to record the exact measurement location, using an unverified instrument, and averaging readings that were taken under poor viewing conditions. Another frequent issue is treating a single questionable reading as final without a retest or photo evidence. This template is structured to reduce those gaps.
Can I customize the acceptance criteria?
Yes. The acceptance section is meant to reflect your project specification, customer requirement, or internal quality threshold. You can add target ranges, minimums, maximums, or location-specific criteria for different glass types and thicknesses. Keep the criteria visible so the inspector does not have to interpret them from memory.
How does this fit into a broader quality system?
It works well as a controlled inspection record inside an ISO 9001-style quality process or a fabrication QA workflow. You can link it to lot traceability, corrective action records, photo evidence, and release approvals. If your team uses digital forms, it can also connect to document control and non-conformance tracking.
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