What is the unit used to express SFRM bond strength in tests?

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What is the unit used to express SFRM bond strength in tests?

Bond strength is the force required to detach the SFRM from the substrate divided by the area over which the coating is bonded. For spray-applied fireproofing tests, this is expressed in pounds per square foot (psf) because the tests and installations are evaluated over relatively large surface areas typical of architectural and structural views. Using pounds per square inch (psi) would give values that are much smaller and less practical for large-area coatings, and while pascals (Pa) are the SI counterpart, the standard practice in U.S. fireproofing tests is to report in psf. A test result of, say, 200 psf means 200 pounds of force are required to detach the coating from each square foot of substrate.

Bond strength is the force required to detach the SFRM from the substrate divided by the area over which the coating is bonded. For spray-applied fireproofing tests, this is expressed in pounds per square foot (psf) because the tests and installations are evaluated over relatively large surface areas typical of architectural and structural views. Using pounds per square inch (psi) would give values that are much smaller and less practical for large-area coatings, and while pascals (Pa) are the SI counterpart, the standard practice in U.S. fireproofing tests is to report in psf. A test result of, say, 200 psf means 200 pounds of force are required to detach the coating from each square foot of substrate.

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