Identifying Polycarbonate Types
- Clear vs. Opaque – Most modern headlights use clear polycarbonate, while older models may have a slight amber tint.
- Thickness – Measure with a caliper; 3 mm is typical for consumer vehicles, 4 mm for commercial trucks.
- Manufacturer Markings – Look for codes such as “PC‑A” or “PC‑B”; these indicate the specific polycarbonate blend and its UV resistance level.
Reading Manufacturer Markings
| Code | Polycarbonate Blend | UV Resistance | Typical Use |
|---|---|---|---|
| PC‑A | Standard polycarbonate | Low | Older sedans |
| PC‑B | UV‑enhanced polycarbonate | Medium | Mid‑range SUVs |
| PC‑C | High‑grade UV‑resistant | High | Luxury vehicles |
Use a magnifying glass to read the small letters; a missing or faded code often signals extensive degradation.
Gauging UV Damage
- Visual Inspection – Look for yellowing, crazing, or micro‑cracks.
- Touch Test – A brittle surface that snaps easily indicates severe UV exposure.
- UV Meter – Measure the remaining UV absorption; values below 30 % suggest replacement is the safer choice.
Restoration vs. Replacement Decision
| Criterion | Restore | Replace |
|---|---|---|
| Thickness > 3.5 mm | ✔ | ✔ |
| UV Absorption > 50 % | ✔ | ✖ |
| Visible Cracks > 2 mm | ✖ | ✔ |
| Cost of Replacement < 30 % of restoration kit | ✔ | ✔ |
If the headlight meets the restoration criteria, proceed with a cleaning‑and‑polishing cycle. Otherwise, recommend a replacement to ensure optimal visibility and safety.
Step‑by‑Step Restoration Checklist
- Clean the lens with a mild detergent.
- Sand with 2000‑grit paper to remove surface haze.
- Polish using a dedicated polycarbonate polish.
- Seal with a UV‑blocking clear coat.
- Test in a controlled environment before installation.
By following these guidelines, you can confidently determine whether a headlight is a candidate for restoration or if replacement is the best route for your clients.
