Compostable Packaging Wholesale Logistics & Shipping FAQ
How long can compostable packaging be stored before it degrades?
Under dry, stable warehouse conditions below roughly 65% relative humidity, molded pulp and bagasse products hold their performance for 18-24 months, and most suppliers document a minimum 12-month shelf life. Compostable bioplastics such as PLA age faster because humidity starts hydrolysis at the polymer level — an irreversible process. Store bioplastic SKUs cool and dry and rotate stock first-in, first-out inside the documented window.
Does ocean shipping damage compostable packaging?
It can, when container sweat is ignored. A container crossing the equator can swing from below 0 C to 40 C-plus, pushing interior humidity past the dew point and condensing water on the cargo. Fiber products must ship in poly-lined or sealed master cartons, with desiccant on long voyages, and the carton-and-product stack should pass ISTA-style transit testing before the first container order. Sources: ISTA transit testing standards, TAPPI moisture resources.
What humidity is safe for storing molded pulp food packaging?
Keep warehouses below about 65% relative humidity, on pallets with a vapor barrier — never directly on cold concrete. Above that level, fiber walls and coatings absorb moisture, edges soften, and stacking strength drops. Log humidity near the stock with a hygrometer and rotate pallets so nothing exceeds the supplier's documented shelf life.
Why do PLA products fail faster in storage than molded pulp?
PLA and similar compostable bioplastics degrade by hydrolysis — moisture breaks the polymer chains chemically, and the damage is irreversible. Molded pulp and bagasse absorb moisture physically and recover partial rigidity when dried. That is why warehouses hold fiber products longer, while bioplastic cutlery and liners need the coolest, driest storage and the strictest first-in-first-out rotation, typically within 12 months.
Who owns a moisture damage claim after ocean freight?
Ownership is decided at handover. Photograph pallet and carton condition at the port before signing the receipt, and compare it against the supplier's loading photos. If master cartons were unlined and cargo sat through a humidity cycle, the damage is usually a specification failure shared by buyer and supplier — which is why moisture-protected carton specs and ISTA-style transit tests belong in the purchase agreement before sailing.
What should a B2B buyer write into a compostable packaging logistics contract?
Six clauses: sealed or poly-lined master cartons for fiber SKUs, desiccants on equator-crossing routes, a stated warehouse humidity ceiling below 65%, supplier-documented shelf life per SKU, ISTA-style transit test evidence for the carton stack, and handover inspection terms with photo evidence at the destination port. Confirm HS classification and entry paperwork with your broker in advance. Sources: U.S. CBP import guidance, ISTA standards, BPI certification program.