How To Select The Correct Barrier Gland For Your Project

Hawke International offers cable glands for many applications and projects. A range of sealing compounds are available for these glands, including our new multi-diaphragm, instant barrier solution.

Select The Correct Barrier Gland

We understand that choosing the correct method of sealing is a challenge, and finding the solution that is right for your application isn’t always easy. There is traditional putty, liquid resins, and new hybrid seals available. Here is our easy guide which will help you decide which type you require for your project:


Advantages of using putty 


Putty compound has long been a popular choice for barrier gland installation due to its unique characteristics. Two-part putty that must be mixed by hand has been traditionally used across the industry for many years.

Our Quick Set Putty (
QSP) sets faster than any previous putty compound. It performs best in horizontal installations.


Users can ensure that each core is contained in the compound as they build the barrier seal. The compound surface can be inspected when using a cable gland with a removable or clear compound chamber.  


Limitations of using putty


Hand mixing increases the risk of incomplete compounding. There is also the risk of hidden gaps inside the compound which may not be seen by the installer.  Cure times can be long (often 12-24 hours) and the components have a fixed shelf life (product will expire).


Installation can be time consuming, especially when you have large numbers of cores. Improper preparation of compound and core position means you may not achieve the movement required to fill the compound chamber correctly.


PPE (Personal Protective Equipment) is required as putty is mixed by hand. 


Advantages of using Express Resin  


Hawke Express Resin provides an alternative solution for barrier gland installation. Uniquely mixed inside the nozzle, it ensures you get the correct mix between the two parts of the resin. The liquid properties allow for flow around the conductors so you achieve a solid barrier with no voids. Hawke barrier glands allow for inspection of the compound by utilising a clear silicone compound chamber.  


The resin pour is faster than any putty installation, and cures faster as well. Should an air pocket be visible, it can be address if you work quickly.  


Limitations of using Express Resin 


The resin must be poured vertically. It can be messy for inexperienced users as there is a short working time and less room for error. If an error occurs and the compound is set, you will need to start over.  


The product has a shelf life, so it can expire. It is also subject to DG Shipping regulations, which can add additional cost when shipping the product around the world.


Advantages of Multi-diaphragm seal 


Our new multi-diaphragm seal offers a distinct set of advantages for barrier gland installation. The new multi seal diaphragm, instant barrier solution can help to reduce overall cost of ownership and can be installed in any orientation or environment. Installation is faster overall, and it is easier to inspect than a compound. The multi-diaphragm seal (MDS) provides an immediate barrier solution, since there is no wait time, equipment can be switched on straight away.


The MDS allows you to use one gland which is suitable for all applications. It is a valid full Exd seal, which is also suitable for and Exe applications. There is no risk of voids and it holds a superior service temperature.


If a seal becomes damaged, it is easy and quick to replace. Overall, the MDS can provide a more cost-effective option than other alternatives with an infinite shelf life. No raw chemicals need to be handled by the installer and there is no DG Rating, so no restrictions for shipping.  


Limitations of MDS Seal


The MDS has limited core size and quantity. Like all glands, there is risk of potential seal damage if installed incorrectly.


View the full MDS range




Whatever the application requirements are Hawke International has a viable solution that will provide a cost effective, inspectable barrier gland to meet the needs of your installation.

For a more in-depth discussion of barrier gland installation options:



To discuss more about your requirements, please get in touch with your local Sales Manager, or contact us directly. We’ll be happy to provide you with support when choosing the correct barrier seal solution for your project.

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