WHAT IS PURENIT? The answer is quite simple: purenit is a high-density smart material combining an incredulous multitude of outstanding properties. purenit performance data can be termed brilliant without any qualification. Purenit is a polyurethane product on a (PUR/PIR) rigid foam basis providing a high thermal insulation value. Its bulk density ranges around 550 kg/m 3 and this makes purenit a genuine lightweight despite all its rigidity, stability and high thermal insulation value.