BOPP Capacitor Film Thermal Shrinkage Tests

2026.09.23

BOPP capacitor film thermal-shrinkage results can vary when specimen direction, conditioning, oven recovery and measurement timing are inconsistent. A single number is not useful unless the test history is controlled.

An engineering plastic film manufacturer needs the film gauge, machine and transverse directions, specimen size, exposure temperature and duration. Dafu lists thermal stability among capacitor-film requirements, while customers must match testing to their metallization and winding process.

Prepare Directional Samples

Label machine and transverse directions before cutting. Take specimens from left, center and right lanes and record their roll position.

Control the Heat Cycle

Use the same conditioning, support method, oven loading, cooling time and measurement equipment for every candidate. Avoid comparing results from different protocols.

Connect Shrinkage to Winding

Evaluate metallized film and wound elements through the customer's thermal program. Send Dafu the protocol, film identity, measurements and observed failure.

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