Fire performance

Stone wool does not contribute to the development or spread of fire.

Stone wool, the core material of our stone wool products, can withstand temperatures up to 2150 °F (1177 °C). It does not contribute to the development and spread of fire. It is made from basalt rock and is non-combustible.

Fire performance describes how well a building component can – for a stated period of time – hold back fire and prevent it from penetrating from one room to another. The basic criteria used to describe the fire performance of a product are:

  • Flame spread
  • Smoke development
  • Non-combustibility

Surface burning characteristics

UL 723 (ASTM E84) / CAN / ULC S102 is a standard method of testing for Surface Burning Characteristics of particular building materials. The test is designed to determine the relative surface burning characteristics of materials under specific test conditions.

Results are expressed in terms of Flame Spread Index (FSI) and Smoke Developed Index (SDI).

Many commercial applications require a Flame Spread Index of 25 or less and a Smoke Developed Index of 50 or less. Products labelled “FHC 25/50” (Fire Hazard Classification 25/50) or “Class A” (ASTM E1264) fulfil these requirements.

ROCKFON® stone wool ceiling panels in North America are UL listed and outperform the fire requirements for ceilings.

ROCKFON Suspension Systems and Specialty Metal Ceilings – Exceeding Expectations

We rigorously test our fire-rated products to ensure they meet or exceed code requirements. By providing both fire rated and seismic rated designs, you can count on ROCKFON specialty metal ceilings and Chicago Metallic® suspensions systems to provide the right solution for your application.


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