SEDL / STP / STP660-EB / STP35734S

Fibrous Insulating Materials as Standard Reference Materials at Low Temperatures

Bertasi, M
Assistant professors, Istituto di Fisica Tecnica, University of Padova, Padova

Bigolaro, G
Researcher, Consiglio Nazionale delle Ricerche (CNR), Laboratorio per la Tecnica del Freddo, Padova

De Ponte, F
Assistant professors, Istituto di Fisica Tecnica, University of Padova, Padova

Pages: 20    Published: Jan 1978

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Abstract

A model is proposed to describe the thermal behavior of relatively high-density fibrous materials. The theoretical approach is compared with experimental results on glass fiber insulating specimens. The results point out the limits of other oversimplified models and the excessive complexity of other models with respect to the precision of results. The agreement between experimental and computed data was considered satisfactory when near to 1 percent.

The theoretical model may be used for computing some limits to obtain reliable standard reference materials with regard to production variations.

The problem of the influence of moisture on measured data is then analyzed, starting from a large set of experimental data obtained on specimens in controlled atmospheres.