• Genuine closed loop. Boxes become protective inserts that protect the next shipment. The circularity story here is concrete rather than abstract, which matters for buyers reporting against packaging targets.
• Kraft heritage in the fiber. Corrugated board is made largely from kraft, so recovered OCC retains more fiber length than mixed office waste. It sits at the stronger end of recycled materials.
• Low cost at volume. OCC is collected at scale and priced as a commodity, which makes it one of the two cheapest inputs in our range.
• Well suited to thick wall forming. Coarse fiber and a rough surface are exactly what Type 1 thick wall parts need, where walls run 1.5 to 6 mm and surface quality is irrelevant.
• Tolerates heavier wall sections. Parts that need bulk rather than finesse form predictably in OCC without the cost of pushing virgin fiber into a thick section.
• Compostable and recyclable uncoated. Nothing is added that interferes with either route.

The fiber length question is the one to understand. Virgin softwood kraft runs 2.5 to 4.5 mm. Recovered OCC runs roughly 0.8 to 1.5 mm, because every repulping and refining cycle mechanically shortens fibers and reduces their ability to bond. The material is still useful for many cycles; it just moves down the strength ladder each time.

This is also why OCC fiber behaves differently from fresh kraft on the forming screen. It drains faster, forms a denser wall, and produces a rougher surface, all of which suit protective applications and work against fine-detail ones.