The present study describes experiments carried out to analyze the effects of superficial treatment on the thermal performance of needlepunched nonwoven sisal fiber used as thermal insulation material. Nonwovens with gramature 1300–1400 g/m2 “in natura” and treated (2% w/w sodium hydroxide) were used to the thermal insulation of a tube of steel internally heated by electric resistance. The samples were submitted to three heating levels: 22.5 W, 40 W, and 62.5 W, corresponding respectively to 77°C, 112°C, and 155°C. Thermogravimetric analysis was carried out and the thermal conductivity was determined.
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Neira et al. (2009) studied this question.
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