The bond strength test method for SFRM described in Technical Manual 12-A can only work for products up to what bond strength?

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Multiple Choice

The bond strength test method for SFRM described in Technical Manual 12-A can only work for products up to what bond strength?

Bond strength tests for sprayed fire-resistance mortar (SFRM) as described in Technical Manual 12-A are designed to produce valid readings only up to a specific load where failure occurs at the adhesive bond line. The method is calibrated for a particular test setup and fixture, so it reliably reflects how well the SFRM sticks to the substrate only up to 1,146 pounds per square foot. If the bond strength is higher than that, the load would tend to cause failure in the substrate or other components of the test setup rather than in the adhesive bond, making the result no longer representative of the actual bond quality. Therefore, readings are only considered valid up to 1,146 psf, and stronger products require a different test method or approach.

Bond strength tests for sprayed fire-resistance mortar (SFRM) as described in Technical Manual 12-A are designed to produce valid readings only up to a specific load where failure occurs at the adhesive bond line. The method is calibrated for a particular test setup and fixture, so it reliably reflects how well the SFRM sticks to the substrate only up to 1,146 pounds per square foot. If the bond strength is higher than that, the load would tend to cause failure in the substrate or other components of the test setup rather than in the adhesive bond, making the result no longer representative of the actual bond quality. Therefore, readings are only considered valid up to 1,146 psf, and stronger products require a different test method or approach.

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