PC（Polycarbonate）material must meet strict fire performance requirements when undergoing the American UL94-V0 flame retardant test. The following is a summary of key information:
1. UL94-V0 testing standard
Test content: Evaluate the flame retardant properties of materials during vertical combustion.
Judging criteria (V0 level):
Single sample combustion time ≤ 10 seconds.
5 samples total combustion time ≤ 50 seconds.
No molten droplets from ignited cotton.
No combustion or smoldering for more than 30 seconds after the second removal of the flame source.
2. Modification requirements for PC materials.
Basic Features:PCIt inherently has V2 flame retardancy and needs to be modified to reach V0 level.
Common modification methods:
Add bromine/phosphorus flame retardants (such as tetrabromobisphenol A).
English compound antimony trioxide (Sb₂O₃) as a co-effector.
Use halogen-free flame retardants (such as organosilicon series, phosphates) to meet environmental protection requirements.
3. Key steps of the testing process
Sample Preparation: 125mm × 13mm × Standard thickness (common 0.8mm, 1.6mm, 3.2mm).
Pre-treatment48 hours (23±2℃, 50±5% humidity).
Combustion test:
Vertical fixed sample, apply blue flame (20mm high) twice, each for 10 seconds.
Record the burning time, dripping matter, and ignition situation.
4. Other related UL94 ratings
V1/V2 level：Combustion time is slightly longer than V0, allows limited droplets (V2 level may ignite cotton).
5VA/5VB：More stringent horizontal combustion test, suitable for high flame retardant demand scenarios.
5. Authentication注意事项
Thickness influence: Thin specimens are more difficult to pass the test, and the actual product thickness needs to be specified clearly.
Other tests: May require combination with ROHS, REACH and other environmental protection regulations.
Accreditation Institution: The manufacturer must pass the authorization test of the UL authorized laboratory and submit the report.
