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pH retention stability refers to the ability of paper to maintain long-term acid-base balance after leaving the factory, which is a key index for archival paper, cultural paper and long-term storage packaging paper. Ordinary neutralized paper will gradually absorb acidic substances from air and environment during long-term storage, resulting in slow pH decline and gradual acidification. Acidified paper accelerates fiber aging and yellowing, reduces folding strength, and causes irreversible brittle damage after years of storage. Most paper mills only detect pH value at the factory but ignore long-term pH retention performance. Temporary neutralization treatment cannot resist continuous environmental acid erosion, leading to slow quality deterioration of long-cycle stored paper. Shandong Ludao Energy Technology Co., Ltd. develops professional paper pH retention stabilization solutions. By adding long-term buffer components to lock paper acid-base balance, we resist external acidic gas erosion and prevent gradual acidification. The treated paper maintains stable neutral pH value for a long time, delays fiber aging and yellowing, greatly prolongs paper storage life, and meets the long-term preservation standards of archival and cultural paper.