I.Ngā tono:
Ko te taputapu whakamātautau ahotea taiao te mea e whakamahia nuitia ana hei tirotiro i te āhua o te pakaru me te whakangaromanga o ngā rauemi kore-whakarewa pērā i te kirihou me te rapa i raro i te mahi roa o te ahotea i raro i tōna pūwāhi hua. Ka inehia te kaha o te rauemi ki te ātete i ngā kino o te ahotea taiao. He whānuitia te whakamahinga o tēnei hua i roto i te hanga kirihou, rapa me ētahi atu rauemi polymer, te rangahau, te whakamātautau me ētahi atu ahumahi. Ka taea te whakamahi i te kaukau thermostatic o tēnei hua hei taputapu whakamātautau motuhake hei whakarerekē i te āhua, i te pāmahana rānei o ngā tauira whakamātautau rerekē.
Tuarua.Paerewa Whakatutuki:
ISO 4599–《 Kirihou - Te whakatau i te ātete ki te pakaru o te ahotea taiao (ESC) - Tikanga riipene piko》
GB/T1842-1999–"Tikanga whakamātautau mō te pakaru taiao o ngā kirihou polyethylene"
ASTMD 1693–"Tikanga whakamātautau mō te pakaru taiao o ngā kirihou polyethylene"