Abstrak
Sabun kertas merupakan inovasi sabun padat berbentuk lembaran tipis yang praktis untuk berpergian, namun kerapuhan berlebihan masih menjadi tantangan produksi. Penelitian ini membandingkan pengaruh lima jenis plasticizer (gliserin, propilen glikol, polietilen glikol (PEG-400), sorbitol, dan sukrosa) dengan lima konsentrasi (0%, 5%, 10%, 15%, dan 20%) terhadap kualitas fisik sabun kertas berdasarkan standar SNI 2048:2020. Studi eksperimental menggunakan desain faktorial 5x5 dengan analisis MANOVA untuk menguji kelenturan, pH, stabilitas busa, dan waktu larut. Gliserin 20% hasil optimal: kelenturan tinggi (14,67 kali lipat), stabilitas busa 91,56%, waktu pelarutan 105 detik, dan pH 9,06. Sorbitol 15-20% dapat menjadi alternatif dengan pH lebih tinggi, namun kelenturannya sedang. PEG-400 dan sukrosa menunjukkan kelenturan yang rendah meskipun mempercepat pelarutan. Gliserin 20% merupakan formulasi optimal karena memberikan keseimbangan terbaik antara kelenturan, stabilitas busa, dan pelarutan.
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