Welcome to the dedicated Armaflex category at Insulation4Less, where we host a selection of superior quality insulation solutions crafted to ensure optimal thermal efficiency and safety in various applications. Armaflex, a pioneer in the field of flexible insulation, offers products designed to minimise energy loss and protect against condensation and pipe bursts. Navigating through this esteemed category, let’s delve into the different types of products and explore their functionalities, assisting you in selecting the most suitable insulation material for your projects.

Which Armaflex do I need?

Start with the service, not the brand name. Cold water, chilled water and refrigeration lines need a continuous vapour-resistant insulation system. Warm domestic services need heat-loss control. High-temperature and outdoor installations can need a different elastomer formulation. The correct answer is a combination of pipe size, insulation thickness, operating temperature, environment and properly sealed joints. A product being described as “Class O” in a retailer title is not a substitute for checking its current Euroclass declaration.

Slit or unslit: what changes on site?

Slit tube is practical where the pipe is already installed and cannot be slid through a continuous sleeve. Open the slit carefully, position the tube without stretching it, and close the seam using the adhesive system specified for that product. Unslit tube can be threaded over accessible pipe before connections are completed. It avoids a full-length site-made seam, but the butt joints and terminations still require careful sealing. Neither format makes a poor fit acceptable. Do not force a smaller bore over a larger pipe or leave a gap around valves and elbows.

Armaflex Pipe Insulation

Class O Nitrile Pipe Insulation

Armaflex offers Class O Nitrile Pipe Insulation in both SLIT and UN-SLIT varieties, adhering to varied application requirements.

• SLIT Insulation: Especially designed to facilitate easy application on existing pipes, the pre-slit format allows for a swift, hassle-free installation without necessitating pipe dismantling.
• UN-SLIT Insulation: Ideal for new constructions or locations where pipes can be fully accessed, the un-slit insulation mandates a manual cut but offers an impeccably snug fit around pipes, minimising thermal bridging.

These products, available in all sizes, are acknowledged for their excellent thermal properties, low thermal conductivity, and robust resistance against fire, making them suitable for a broad spectrum of applications, including HVAC systems, refrigeration pipelines, and more.

Armaflex Insulation Adhesives and Tapes

High-Temperature Insulation and Standard Pipe Insulation Adhesive

When adhering insulation to pipes or sealing the joints between insulation sections, especially in systems experiencing elevated temperatures, Armaflex provides two distinct adhesives:

• High Temperature Pipe Insulation Adhesive: This adhesive is crafted to withstand elevated temperatures, ensuring durable bonding even under rigorous conditions.
• Pipe Insulation Adhesive: Suitable for general applications, this adhesive ensures a steadfast bonding of insulation to surfaces, safeguarding against potential heat loss.

Pipe Insulation Tape and Lagging Tape

Tapes from Armaflex provide additional fortification and are instrumental in safeguarding insulation integrity:

• Class O Pipe Insulation Tape: A specialised tape designed to further enhance the insulation, especially at joints and connections, ensuring a seamless thermal barrier.
• Pipe Insulation Lagging Tape: This provides an extra layer of protection, preventing mechanical damages and enhancing the thermal performance of the insulation.

Coating Solutions

FR Pipe Insulation Paint

Offering a 2.5-litre capacity and available in various colours, Armaflex’s FR Pipe Insulation Paint is developed to enhance the fire-resistant properties of the insulation. This paint can be applied directly to the insulation surface, enhancing its aesthetic appeal while providing an additional layer of fire protection, especially relevant in environments where additional fire safety measures are paramount.

How thick should pipe insulation be to stop condensation?

The right thickness is not decided by pipe diameter alone. Condensation occurs when the external surface of the insulation falls below the surrounding air’s dew-point temperature. The design therefore needs the fluid temperature, ambient air temperature, relative humidity, insulation conductivity and geometry. Chilled services in a humid plant room may need substantially more protection than cold water pipework in a dry indoor space. A manufacturer calculation or project specification should determine thickness; choosing the thickest tube on the shelf is not a substitute for that calculation.

The vapour-control layer matters as much as nominal thickness. Closed-cell foam resists water vapour movement, but an open seam, damaged section or unsealed termination can let moisture reach the cold pipe. Seal the full system, including fittings and supports. If a line already drips, check for existing trapped moisture and corrosion before covering it.

Frequently asked questions

What is Armaflex pipe insulation made from?

Armaflex is a brand of flexible closed-cell elastomeric insulation. AF/ArmaFlex Evo is based on synthetic rubber, while HT/ArmaFlex uses EPDM. The closed-cell structure helps resist moisture movement and reduce heat transfer. Always identify the exact range because the temperature limits, fire classifications and outdoor suitability are not identical.

Is Armaflex suitable for cold water pipes?

AF/ArmaFlex Evo is intended for HVAC, refrigeration and other technical services, including cold pipework. Correct sizing and continuous sealed joints are essential where condensation is a risk. The insulation thickness should be selected using the pipe temperature and surrounding humidity, not solely the diameter printed on the tube.

Does Armaflex stop condensation?

Correctly designed and installed Armaflex can control condensation by keeping the external surface above dew point and limiting water vapour entry. It is not a guarantee against dripping when thickness is inadequate or seams are open. Check ambient humidity, service temperature, supports and all terminations before selecting a product.

What is the difference between slit and unslit Armaflex?

Slit tube has a lengthwise opening that makes fitting around existing pipework easier. Unslit tube is useful where it can be threaded over the pipe before final connections. Both need correct bore selection and sound joint detailing. A slit tube should not be treated as self-sealing unless that particular variant says so.

Is Armaflex waterproof?

Closed-cell elastomeric foam offers resistance to water vapour, which is useful on chilled services. That does not make every installed joint, cut end or external assembly waterproof. Use the specified adhesive and weather protection where required. Inspect seams and penetrations rather than relying on the foam material alone.

Can Armaflex be fitted outdoors?

Outdoor suitability depends on the range. Armacell requires ultraviolet protection for AF/ArmaFlex Evo, while HT/ArmaFlex has very good UV resistance. Consider rain, impact, temperature and exposed joints as well. Choose a complete manufacturer-compatible system rather than assuming all black elastomeric insulation behaves alike.

How do I choose the correct Armaflex pipe size?

Measure the pipe’s outside diameter and select the matching insulation bore. Do not confuse a nominal plumbing size with an actual outside diameter. Then select insulation thickness from the project’s thermal or condensation design. Check the product variant and pack quantity before placing the order.

How thick should Armaflex insulation be?

There is no single correct thickness for every pipe. A condensation-control design uses pipe temperature, air temperature, humidity and insulation performance. A heat-loss design may have different requirements. Use the project specification or a manufacturer calculation, and confirm that the selected thickness is available for the required pipe bore.

Does Armaflex need adhesive?

Many Armaflex installations require compatible adhesive at butt joints, longitudinal seams and fittings. The exact method depends on whether the product is unslit, slit or supplied with a self-adhesive closure. Follow the current Armacell installation instructions. Tape should not automatically be substituted for a bonded seam.

How much Armaflex do I need?

Measure the pipe runs and include fittings, branches and cutting waste. Divide the required length by the linear metres in the selected pack, then round up to whole packs. The category prices shown for insulation tubes are starting prices for configurable products. Check the variant’s pack quantity before calculating cost per metre.