He rauemi ārai maha ngā āhuatanga o te pahuka polyurethane rehu (SPF) i runga i te hanganga matū, ā, nā te mea kāore te rauemi i rehuhia ki te pahuka e memeha haere i roto i te wā, he maha tonu te whakamahinga i roto i te pūnaha ārai o ngā whare. E rua ngā wāhanga matua: ko ngā isocyanates me te ranunga o ngā tāpiringa, tae atu ki ngā polyols mengā whakakorikori, ka whakaranua ki te papaanga hei hanga i tētahi paparanga ārai kaha. E rua ngā momo matua o te pahuka rehu: te pahuka pūtau-tuwhera me te pahuka pūtau-kati, he rerekē ngā āhuatanga me ngā whakamahinga o ia momo.
Pahuka Rehu Pūtau-Tuwhera
He iti ake te utu o te pahuka rehu tuwhera-pū, ā, he nui ake te kaha ki te whakawhānui, ā, ka taea te whiriwhiri ina whakakī ana i ngā wāhi nui ake. Nā te mea he nui akengāwari, ka taea te tango ngāwari ake, ā, ka taea hoki te whakakī ki te whakamarumaru mō ngā kokonga uaua ki te tae atu. He rite te hanganga pūtau o te pahuka pūtau-tuwhera ki ngā mirumiru iti me ngā whakatuwheratanga e taea ai e te hau te rere. Ahakoa e whakarato ana i te ātete hau, kāore e whakarato i te ārai makuku nā te mea ka taea e tōna urunga te haere o te wai. He uara-R (he ine i tōna kaha whakamarumaru) tata ki te 3.5 ki te 3.8 ia inihi, he pai mō ngā tono e hiahiatia ana te rere o te hau engari kāore e hiahiatia te ātete makuku. He mea whakamahi noa i roto i ngā pakitara o roto, i ngā rūma tuanui, me ngā wāhi e hiahia ana ki te whakamarumaru oro, nā te mea he pai hoki te whakaiti i te haruru e tōna hanganga poka-tuwhera.
Pahuka Rehu Pūtau-Katia
Ko ngā pūwero e piri tahi ana hei hanga i tētahi hanganga matotoru ake ka kiia he pahuka pūtau-katia. He matotoru ake, he pakari ake te pahuka rehu pūtau-katia, ka hanga he ārai kaha ki te hau me te makuku. Mā ōna pūwero e piri ana ka ārai i te hau me te makuku kia kore e uru, ka waiho hei ārai makuku whai hua. Ka iti ake te tere o te whakawhanui i te pahuka pūtau-tuwhera, engari ka pai ake te ārai, me te uara R tata ki te 6.0 ia inihi. Ko te teitei ake o te uara-R, ko te kaha ake o te ātete o te pahuka pūtau-katia ki te rere o te wera, ka pai mō ngā tono o waho e hiahia ana ki ngā uara ārai teitei ake me te tiaki makuku, pēnei i ngā tuanui, ngā turanga, me ngā pakitara. Ahakoa te utu nui ake, ko te pahuka pūtau-katia te mea e pai ake ana i ngā wāhi he iti te wāhi engari me nui te ārai e hiahiatia ana.
Hei whakarāpopototanga, he pai ngā pahuka rehu pūtau-tuwhera me ngā pahuka pūtau-kati, engari he rerekē ngā āhuatanga me ngā whakamahinga. He iti ake te utu o te pahuka pūtau-tuwhera, he nui ake te whānui, ā, ka taea te rere o te hau, ko te pahuka pūtau-kati ia he matotoru ake, he ārai makuku, ā, he nui ake te uara-R. Ko te kōwhiringa i waenga i ngā mea e rua ka whakawhirinaki ki ngā hiahia kaupapa motuhake, tae atu ki te tiaki makuku, te whai huatanga o te whakamarumaru, me te tahua.
Wā tuku: Hepetema-24-2024