Ko nga hoahoa flange e whakamahia nuitia ana he peera ngohengohe ka kohia ki waenga i nga mata flange kaha ake hei hanga hiri kore-kore. He rapa, elastomers (wairau punawai), polymers ngohengohe e uhi ana i te whakarewa puna (hei tauira, he kowiri tira te hipoki PTFE), me te whakarewa ngohe (parahi, konumohe ranei...
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