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K-Flex, Kaiflex & Armaflex: Whats the difference?

Closed-cell Foam Insulation in sheets and pipes made by Kaiflex, K-Flex, Armaflex and others

Jonathan Hill |

K-Flex, Kaiflex, and Armaflex are all brands of closed-cell foam insulation used for pipe insulation, but there are some differences between them. Kaiflex is a brand owned by Kaimann, Armaflex by Armacell and K-flex manufactures and sells under the same name.

What is a Closed-Cell Foam?

Closed-cell foam is a type of foam material that is made up of small, tightly packed cells that are completely closed off from each other which means that the foam does not allow air or water to pass through it, making it an effective insulator.

Closed-cell foam can be made from a variety of materials, including synthetic rubber, polyurethane, and polystyrene. It is commonly used in a variety of applications, including insulation, packaging, and cushioning.

One of the main advantages of closed-cell foam is its insulation properties. The small, closed-off cells of the foam trap air inside, creating a barrier that helps to prevent the transfer of heat or cold. Closed-cell foam is therefore commonly used as an insulation material in buildings, vehicles, and appliances.

Differences between the 3 Brands

Ultimately, the choice of insulation brand will depend on the specific application and insulation requirements and it is always best to consult with an insulation expert to determine the best product for your specific needs. That having been said, here's a quick overview of some of the key features and differences between the brands and their products.


K-Flex and Armaflex are made of a material known as elastomeric nitrile rubber, Kaiflex is made of EPDM (ethylene propylene diene monomer).

Nitrile rubber is a type of synthetic rubber that is commonly used in a variety of applications, including the production of seals, gaskets, hoses, and insulation materials. Both K-Flex and Armaflex are made from elastomeric nitrile rubber, which is a type of nitrile rubber that has been formulated to provide superior thermal insulation properties.


Kaiflex, on the other hand, is made from EPDM (ethylene propylene diene monomer), which is a different type of synthetic rubber that also has excellent insulation properties and is commonly used in insulation applications.


While all three brands offer lagging for pipes and other forms of common insulation, K-Flex and Kaiflex offer a significantly wider range of insulation products, including sheet insulation and tube insulation, whereas Armaflex focuses more on pipe insulation.


K-Flex and Kaiflex offer a wider range of thicknesses than Armaflex, allowing for greater flexibility in insulation thickness to meet different insulation requirements.

Environmental considerations

Kaiflex and K-Flex are both free of harmful substances like CFCs and HCFCs, while Armaflex has some halogens, which may be a concern for some environmentally conscious buyers.


The prices of each brand may vary depending on the specific product, size, and thickness, but in general, Armaflex is considered to be the most expensive, followed by K-Flex and then Kaiflex.

Where To Use Each?

K-Flex, Kaiflex, and Armaflex insulation products are suitable for use in both internal and external applications. However, the specific type and thickness of insulation required will depend on the specific application and the environmental conditions.

All three brands manufacture specific lines of products (sometimes under a sub-brand) specifically for external applications and it is important to choose that line in order to gain the benefits of an insulation product that is resistant to UV radiation, moisture, and extreme temperatures.

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