• FLEXSEAL_Dynat
  • FLEXSEAL_Dynat

FLEXSEAL® has a strong and flexible coil element offering a durable, light weight and fully waterproof solution for the most demanding applications.
The extruded fin profile offers protection from the outside and prevents dirt from builiding up. The polyester coil elements are self-aligning in case of misalignment or the chain bursting open.

  • Water performance :
  • Flexibility :
  • Water performance :
    CR25 tape - 0.4bar
    P23 tape - 0.05bar
    *Testing is done only from the outside. Not from the inside of the zipper.


Size Chain Type Tape Classification
Closed End Open End
85 SEY CR25 (Chloroprene) Both ends closed
One end closed
P23 (Polyurethane) Both ends closed
One end closed
not available

*OR = Open, Right hand insertion


Closed-end (One end closed, Single-SEAL)

Closed-end (Both end closed, W-SEAL)

Parts variation


Tape Chloroprene Polyurethane
Logo Dynat YKK


Tape (Coating) Tape (Base) Elements Slider Top stop Bottom stop
PU (Polyurethane) Polyester Polyester Stainless Polyurethane Polyurethane
CR (Chloroprene) Polyester Polyester Stainless Chloroprene Chloroprene


  • Heavy duty surface water sports garments
  • Immersion suits
  • Survival suits
  • Chemical protection suits
  • Dry bags
  • Waterproof shoes
  • Industries


Catalog Download

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Technical support


YKK fastener can be used for many fastening needs, however, it is not suitable for walking water balls, or similar items. YKK does not recommend the use of our fasteners on walking water balls or similar items, will not provide warranties for such use, accepts no liability for such use and will avoid selling these fasteners for such use.


The purchaser/user is solely responsible for testing the FLEXSEAL® zippers for suitability in the proposed application. Any proposed use of FLEXSEAL® zippers must be fully and appropriately tested by the purchaser/user. For uses in life/limb or other safety critical circumstances, field trails are recommended. YKK disclaims all implied warranties with respected to FLEXSEAL® zippers, including without limitation any implied warranties of merchantability and fitness for a particular purpose. In no events shall YKK be liable for any indirect, special, incidental, or consequential damages relating to FLEXSEAL® zippers, whether based on breach of express or implied warranty, breach of contract, negligence, strict liability or any other basis.