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Concurrent movement calculation

A rubber expansion joint is an essential part of a structure’s foundation. It allows for the expansion and contraction of materials in an area of high movement. These joints are used in a variety of applications. They have several advantages, including their cost and ease of installation. These advantages make them an ideal choice for many construction projects.

When designing and selecting an expansion joint, it is important to consider the concurrent movement. Because axial, lateral, and angular movements of a joint typically occur simultaneously, it is essential to know its concurrent movement capacity. The calculation for concurrent movement capacity is simple: multiply the joint’s non-concurrent capacity by the amount of simultaneous movement required, and add the two values together. The result should be less than 1.0.

In many cases, concurrent movements will exceed the allowable movement capacity of an expansion joint. In such cases, an extra arch must be installed.

Material selection

When choosing a rubber expansion joint, you need to carefully consider the properties of the elastomer that will be used. A material’s performance can depend on its chemical and thermal resistance. Some elastomers are less resistant to these conditions than others. For example, EPDM has a higher temperature rating than natural rubber, but its abrasion resistance is significantly reduced. Fortunately, there are a few options that will meet your needs.

First, you need to consider the service conditions that the rubber expansion joint will be placed under. You will want to choose between natural and synthetic rubber, as well as a blend of the two. In order to prevent leaks, you should choose a leak-proof lining for the inner tube. In addition, you want to select a material that will withstand the flowing media that will be placed in the joint.


There are several limitations associated with rubber expansion joints. The method used in the manufacturing of this type of joint requires manual application and skimmed cords that are difficult to position efficiently. It is also important to consider the number of layers in order to prevent delamination. One advantage of this method is its flexibility. If the joint is to be used on more than one flange, the joint must be placed in pairs.

The design and manufacturing process can be optimized with new technologies. For example, industrial robots can apply the reinforcement layer individually, which helps increase repeatability. This technology also allows for different fiber angles throughout the length of the product.

Sealants for horizontal applications

There are several different types of sealants available for horizontal rubber expansion joint applications. Some of these include DECK-O-SEAL, POURTHANE, SOF-SEAL, and PURTHANE NS. These are ideal for smaller, horizontal joints, while some are designed for larger or more intricate joints.

For horizontal rubber expansion joint applications, self-leveling polyurethane sealants such as Sikaflex can be used. They are fast-drying, permanent-flexible, and weather-resistant. Sikaflex is best applied at temperatures between 40°F and 100°F, and is fully cured within 3 to 5 days.


A rubber expansion joint is a great way to prevent ductwork from buckling and pulling apart. It also helps to reduce the costs associated with maintaining ductwork. It is very costly to replace ductwork. EPDM Rubber expansion joints are a great way to avoid those costs. You can also choose between other types of elastomers and specialties.

A rubber expansion joint is a flexible unit made from natural or synthetic elastomers or fluoroplastics. It can be reinforced with steel, nylon, or aramid fibers for added strength and durability. It is the perfect solution for pipes and other systems because it absorbs movement. It also increases the service life of the piping system.