A professional who tests mat of fiberglass insulation material to determine if product conforms to specifications. Respnsibilities include:

• Cuts sample of mat, using knife or razor blade and template, and weighs mat on balance scale.
• Burns weighed sample in miniature oven to remove binder, weighs burned sample, and computes percentage of binder in sample, using slide rule.
• Suspends sample of mat in styrene solution and times disintegration of sample to determine solubility of binder.
• Places sample between plates of thickness gauge and reads dial indicator before and after application of pressure to gauge to determine thickness with or without stress.
• Records test results on mat-testing record.