Valuation and analysis

Types of Rubber Expansion Joints

The design of a rubber expansion joint is extremely important. It must be optimized for current design and manufacturing processes. The highest-quality rubber expansion joints are mandrel-built, whereas the lowest-end versions are sheet-based. The reinforcement cords are embedded into the rubber and then applied in sheet form, typically with the cord angles oriented in opposite directions. They are then cut and folded under the flanges.


PTFE/TFE/FEP-lined rubber expansion joints combine the corrosion resistance of an integral PTFE liner with the strength of a flexible elastomer. These liners can be found in a variety of configurations and styles, and are manufactured using a process adapted from the tire cord industry. A fabric matrix is formed by weaving polyester tie cord and an elastomer reinforced with wire. The outer material is bonded to the PTFE liner, providing a seamless connection.


The NBR rubber expansion joint is a versatile piece of equipment. It can be used in a variety of applications and is FDA-approved for food use. Its resistance to oils and fats makes it ideal for use with pulp, flour, and juices.


HNBR rubber expansion joints are a good option for a variety of applications. They are highly resistant to abrasion and have a steel wire cord reinforcement. This type of material is also flame resistant and suitable for use in diesel or petrol engine rooms. Moreover, these joints are resistant to high temperatures and are ozone and ageing resistant.


Unisource Series 303 female union connectors are constructed of high-quality EPDM rubber and reinforced nylon tire cord. The EPDM material offers better temperature resistance and physical properties. The flanges, which are galvanized steel, engage with the rubber beaded end of the expansion joint and allow the installation to be completed quickly. This style of expansion joint is ideal for isolating small diameter piping from vibrations and mechanical equipment.

Style HA

Unisource’s Style HA rubber expansion joint is an elastomeric, thinner gauge piping system designed to protect duct and thin wall piping systems. These elastomeric joints are available in circular, square, and rectangular configurations. These expansion joints feature integral rubber flanges and have continuous corners to eliminate splices near the corners. In addition to a variety of different flanges, the Series HA expansion joint can be used in applications requiring increased axial movement and a thin wall duct system.

Full face integral flange design

A full face integral flange design for rubber expansion joints has many advantages over a traditional slotted flange. In addition to its excellent pressure and shock absorption properties, this design is lightweight, odorless, and non-toxic. Its versatility also makes it an economical choice for large connections and pipes with frequent temperature and vibration changes.

ASTM standards

Rubber expansion joints are available in different material types and specifications. They can withstand high pressures, temperature changes, and abrasions. Depending on their use, they can be configured to accommodate angular or torsional movement and may also incorporate directional anchors.

Material selection

When it comes to the construction of a rubber expansion joint, it is imperative to choose the right material for the application. There are several different elastomers that can be used. Some of these materials are more durable than others and can withstand different temperatures and pressures. EPDM, IIR, NBR, and PTFE are common examples of these materials. Some of these materials also have different inner tube diameters, and choosing the correct material is based on the design requirements.

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