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Daya tahan geni saka lawang geni Grade C ora kurang saka 0.6h. Bakal ana lapisan uyuh elektrostatik ing permukaan, lan interior diisi karo bahan insulasi termal sing ora beracun lan ora mbebayani. Pengisi lawang tahan api Kelas C yaiku bahan tahan api perlite lan semen sing cocog karo standar perlindungan lingkungan lan proteksi geni.

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