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Guides from the closure floor.

Practical, jargon-free notes on ROPP caps, wads and sizing — to help you spec the right closure.

ROPP Basics

What is a ROPP cap? Roll-on pilfer-proof closures explained

Why this small aluminium component is critical to sealing, security and shelf life.

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Wads & Liners

EPE vs latex wads: choosing the right liner for your bottle

The liner — not the shell — decides whether your bottle holds its seal. Here's how to pick.

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Sizing

ROPP cap sizes explained: 20, 22, 25 & 28 mm and where each fits

A quick guide to matching neck size to product, from vials to wide-neck bottles.

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