Archival Polyester Sealant
Photostat negatives contain a lot of printed ink. Public use and time erode the ink, and as the ink flakes off, the text becomes illegible and lost. LBS’s Archival Polyester Sealant will preserve photostat negatives for long-term use and storage.

The process begins when sheets are loaded onto hooks. The hooks are attached to rods, which are connected to the conveyor chain. The chain carries the sheets down the line to the spray booth chamber. Inside the spray booth chamber, jets with precision-set nozzles evenly coat the sheets with the archival polyester sealant. The sheets then rise from the top of the spray box to swing past several drying fans. The choreographed process is complete when a last jet of air gently removes the sheet from its hooks and onto a rolling belt. They ride to the end of the belt and fall into a stacker box, where they wait to be collected for rebinding as newly-preserved photostat negatives.

After treatment, the photostat negative ink is permanently sealed to the paper. The sealant provides abrasion resistance, and UV absorbers block 99% of UV light. A quick eraser test confirms that the sealant works; no ink can be rubbed off.