PCO 1881 vs PCO 1810: Which Neck Finish Should You Specify?

Detailed comparison of PCO 1881 and PCO 1810 neck finishes for CSD PET bottles — weight savings, compatibility, and migration path.

The short answer

PCO 1881 is the modern global standard for CSD bottles. PCO 1810 still exists in legacy lines but new programs should specify 1881 by default. The 1881 finish saves roughly 1 g of HDPE per cap (the shorter 13.5 mm neck trims more PET from the preform) and reduces pallet shipping volume by 10–15%.

Dimensional differences

PCO 1810 has a taller neck with more thread profile (16.0mm total height). PCO 1881 reduces that to 13.5mm. The bottle support ring is identical, so bottling-line conveyor changes are minimal. The thread engagement is shorter but optimized for the same removal torque.

Weight savings explained

The HDPE cap is roughly 1 g lighter, and the shorter 13.5 mm neck also trims PET from every preform. Across high-volume CSD programs that adds up to meaningful annual resin savings. Add ~10% pallet density improvement from the shorter neck and the supply-chain economics tilt strongly to 1881.

CO2 retention

Both finishes hold the same carbonation pressure when paired with a correctly-torqued cap. PCO 1881 is rated to 4.5-volume carbonation and has been qualified for it by leading bottlers.

Migration path

Moving from 1810 to 1881 requires: new preform mould (or insert), new cap, and a filler-line capper adjustment (height + torque profile). Conveyor and rinser changes are typically not needed. Most bottlers complete the transition in a single planned shutdown.

What Delta El Nile for Industry offers

18 PCO 1881 SKUs from 13g (250ml) to 53.6g (2.5L). All qualified on Husky injection systems. Lead time 4–6 weeks for new programs. Engineering support included.