SPF Testing – Thermal Insulation
Thermal insulation is one of the key components of a good collector. Thermal insulation usually contains binders or other chemicals that outgas at high temperatures and cause deposits on the cover. With an SPF certificate this can be prevented.
Modern collectors can easily reach temperatures of around 200 °C. At such high temperatures, substances of the thermal insulation can decompose, causing sediments to be deposited on the cover. In general these are visually disturbing and may also affect collector performances considerably, in particular where anti-reflex covers are used.
Out-gassing from insulation is often one of the main causes of failure in collector tests.
With the SPF certification program for insulation materials in thermal collectors, the outgassing behavior is assessed: The insulation is heated in a controlled manner and caused to outgas. The precipitates are visually assessed and classified. The outgassing of thermal insulations intended for use with anti-reflective treated glass is also evaluated spectroscopically