The international standard for fire rating of WPC wall cladding panels is determined by testing the panels against specific fire performance criteria. One commonly used standard is the ASTM E84 test, also known as the Steiner Tunnel Test or the “Tunnel Test.” This test measures the flame spread index and smoke developed index of a material.

The flame spread index indicates how quickly flames spread across the surface of the material, while the smoke development index measures how much smoke is produced during combustion. Both indices are measured on a scale, with lower values indicating better fire performance.

In many countries, including the United States, the following ratings are typically used to classify materials based on their flame spread index:

To ensure compliance with fire safety standards, it is essential to choose WPC wall cladding panels that have undergone appropriate fire testing and received the necessary certifications based on the specific international standards and regulations applicable in your region.