NRCA Thermoplastic Practice Questions - NRCA ProCertified Thermoplastic Installer Exam

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During hot-air welding of thermoplastic membranes, a technician uses a hand probe after welding. What does a properly welded seam feel like when probed at the seam edge?

The probe slides freely under the entire seam with no resistance The probe catches and tears the membrane edge when pulled across The probe cannot be inserted and the seam edge shows a small bead of melted membrane The probe penetrates easily for 0.5 inch then stops at a hard barrier

Correct Answer:

The probe cannot be inserted and the seam edge shows a small bead of melted membrane

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