Airtight zip technology, written down

Four steps to choose rating, size, material and custom specification

Choose an airtight waterproof zipper in four steps: waterproof rating, size, material and custom specification. Includes the published IPX6–IPX8, #5/#8/#10 and material comparisons.

A complete comparison of three sealing levels

Airtight, watertight and waterproof are three different sealing levels. This guide compares their definitions, ratings, structure and typical uses — and the one question that tells you which you need.

Understand waterproof rating codes on zippers and gear

What IPX6, IPX7 and IPX8 actually mean, with the IEC 60529 test conditions behind each rating and the limitations of using IPX alone to specify a sealed zipper.

Material selection and testing for drysuit envelope zippers

Why silicone rubber is used for drysuit envelope zippers, how salt water and deep-sea pressure affect the seal, and what to test before specifying an IPX8 drysuit closure.

How a TPU airtight zipper is built and assembled

How TPU airtight zippers are constructed and joined to a host material — high-frequency welding, sewing with tape, and bonding — and what each process means for seal integrity.

Choosing a closure for inflatable gear

What an inflatable closure has to do — hold air pressure, survive folding and resist abrasion — and how airtight zipper specification follows from that.

How to compare airtight zipper suppliers

What to compare when sourcing airtight waterproof zippers — published test values, material capability, process range, customisation envelope and documentation.

The parameters and process for a custom order

A complete procurement checklist for custom airtight zippers: the parameters to supply, the sample validation steps, and the acceptance criteria to agree before mass production.