Film-forming coating waxes and wash-water sanitizers — carnauba wax, shellac, and peracetic acid — for produce grading lines: gloss and moisture-loss control on fruit, plus dump-tank and flume sanitation.
Post-harvest coatings are thin surface films applied to fresh produce on the packing line to slow water loss and restore the gloss that washing removes. The two workhorse film-formers are carnauba wax, a hard plant wax that gives a durable high-gloss layer, and shellac, a resin that forms a tighter, shinier film. Peracetic acid is the companion wash-water sanitizer used upstream in dump tanks and flumes; it is not a coating itself. Specify the coating by commodity and target finish, not by a single wax.
Carnauba and shellac are usually blended rather than used alone. Carnauba is breathable and tolerant of handling; shellac seals more completely and shines more, but a heavy shellac film can restrict gas exchange enough to cause anaerobic, fermentation-type off-flavors in some commodities. That gas-exchange trade-off is the central formulation tension. A common starting point is a carnauba-dominant blend with shellac added for gloss, then adjusted per commodity and storage duration.
Grade and food-contact status are the decisive specification, not the wax chemistry alone. Carnauba and shellac are UVCB naturals sold in technical and refined grades, and only certain grades are intended for food-contact use; confirm regulatory status for your application and jurisdiction before use on edible produce. For wash-water sanitation, peracetic acid is dosed in the flume or dump tank and decomposes to acetic acid, oxygen, and water, leaving no chlorinated residue.
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