I roto i te umanga rauemi hanga, he mea nui te pumau me te pono. HPMC (Haidroksiporoporo Mītirau) he tāpiringa nui mō ngā piripiri tāera, ngā moata ranunga maroke, te putty pakitara, me ngā pāreti, e pā ana ki te mahi, te pupuri wai, te wā tuwhera, me te kaha o te piri. Te mahi tahi me te kaiwhakarato HPMC pumau āwhina i ngā kaihanga ki te whakaiti i ngā mōrearea whakaputa me te pupuri i te kounga hua pumau.