Define the thermal duty cycle
State the target temperature range, continuous or intermittent exposure, dwell time, heating and cooling rates, number of cycles and any expected excursions beyond the normal condition.
Document atmosphere and adjacent materials
Record air, inert gas, vacuum, humidity, chemicals and cable or packaging materials that can influence oxidation, moisture uptake, adhesion or stress during aging.
Establish the coated-fiber baseline
Document the glass, primary and outer coating materials, dimensions, draw and cure process, conditioning and baseline optical and mechanical measurements before exposure.
Measure retention after defined exposures
Check coating appearance and integrity together with application-relevant attenuation, adhesion, strip behavior, tensile or handling tests. Use consistent conditioning and measurement methods.
Compare material routes without merging ratings
A dual-layer UV-curable system and a polyimide route use different materials and processes. Compare them against the same application requirements without substituting Tg, decomposition temperature or short-term exposure for service life.
INFORMATION CHECKLIST
Prepare these details for a productive material discussion.
- Target temperature, duration and duty cycle
- Atmosphere, humidity and adjacent materials
- Fiber, coating dimensions and process baseline
- Optical and mechanical retention methods
- Acceptance criteria and inspection timing
TECHNICAL FAQ
Questions to clarify before evaluation
Does a 150–200°C target range establish continuous-use life?
No. Service life depends on duration, cycling, atmosphere, fiber construction, process and the acceptance criteria demonstrated after exposure.
Can Tg or decomposition temperature be used as a service-temperature rating?
No. They are material-analysis results and do not replace finished-fiber aging and retention data.
Why should both coating layers be evaluated together?
The primary layer, outer layer, interface, dimensions and shared cure process form one finished coating system.