This Technical Bulletin is another in Dyplast's series to provide objective information to decision-makers and end-users on important issues related to mechanical insulation (i.e. insulation for equipment). Although technically intense in some paragraphs, this Technical Bulletin objectively encapsulates more than can be gleaned from other documents generally available.
Thermal aging is a term that refers to the tendency of some insulants to lose some thermal resistance over time - - predominantly due to the very slow diffusion of low-thermal-conductivity cellular gases out of the cells within the insulation, only to be replaced by "air" with higher thermal conductivity. Since thermal aging is so often used as an argument for or against a particular insulation, it is important to understand this somewhat complex phenomenon.
It is even more important to understand that aged polyisocyanurate still has better thermal conductivity than other insulants that may not age.
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