SUBLIMATION PROCESS

In chemistry, sublimation is a process which is known to use massive amounts of BTU energy in effecting a transormation of a solid material directly into vaporizing gases without an intermediate liquefying stage (i.e.: dry ice). Thermo-Lag technology utilizes this process.

Thermo-Lag sublimes like dry ice, but at higher temperatures, maintaining the temperature of the substrate at the temperature of sublimation during the chemical reaction and creating a counterflow of gases to block the heat input of fire. The fire reating provided by a Thermo-Lag coating is largely determined by the applied thickness. Thermo-Lag provides more fire protection than any other fireproofing at a comparable thickness!


How Thermo-Lag Works

1. Endothermic volatilization of the tough, resilient Thermo-Lag coating takes place in an energy absorbing chemical reaction when heat reaches the temperature of sublimation.

2. Formation of heat-exchanging char coating on the surfaces of the subliming compound adds a highly efficient cellular insulation and a radiating shield to further delay heat penetration.

3. Sub-surface sublimation utilizes additional heat energy to drive the released gases through the char barrier until all of the protective coating has reacted

As the sublimation continues, a protective char layer begins to form between the high hear and the flame source and the structural steel coated with Thermo-Lag.

The formation of heat-exchanging char coating on the surfaces of the sublimating Thermo-Lag continues to function as a cellular insulation, and a radiating shield to further delay heat penetration.