He ʻano paipu i hoʻopaʻa ʻia me ka fiberglass non-alkali a uhi ʻia me kahi ʻano resin silicone kūikawā ʻoiai ke kiʻekiʻe ka wela. ʻO kēia ʻano ʻaoʻao ʻaoʻao he fiberglass a ʻo waho ka wili silicone rubber. ʻO 200 ka helu kū'ē wela°C, Hoʻohana nui ʻia no ka pale ʻana i ka insulation kiʻekiʻe-voltage o nā mea uila me ka hana wela kiʻekiʻe, e like me ka pale insulating, nā mīkini uila, nā mea hana hale, nā lako uila, etc.