What are rubber expansion joints?

A rubber expansion joint is a flexible connector to absorb noise, shock, vibration, physical and thermal energy. Made of natural or synthetic elastomers it may be internally reinforced with fabrics and metal for strength and pressure resistance whilst metal reinforcement may be used externally for movement control.

What are types of expansion joints?

Other types of expansion joints can include: fabric expansion joint, metal expansion joint (Pressure balanced expansion joints are a type of Metal expansion joints), toroidal expansion joint, gimbal expansion joint, universal expansion joint, in-line expansion joint, refractory lined expansion joint, hinged expansion …

How do you use a rubber expansion joint?


  1. Apply Lubricant. Rubber expansion joints face flanges may be painted with a solution of graphite in water or glycerin to prevent adherence of joint to pipe flanges.
  2. Insert Expansion Joints into Position. Do not use gaskets for AMS/AMT series.
  3. Insert Bolts.
  4. Tighten Bolts.
  5. Control Rods.
  6. Additional Tips.

How long do rubber expansion joints last?

7 to 10 years
Maintaining Rubber Expansion Joints If installed and maintained correctly, the expansion joint is expected to last 7 to 10 years, but the specifications will vary depending on the application.

What is the difference between a bellows and expansion joint?

We usually use the following definitions, but the terms “bellows” and “expansion joint” are generally considered interchangeable: Metal bellows: it is the flexible element of metal expansion joint. Rubber bellows: it is the flexible element of rubber expansion joint.

Which material is used in expansion joint?

Expansion Joints in Building/Construction The material used for expansion joint fillers include low viscosity epoxy resins, silicone gels, and cork and woods such as southern yellow pine, redwood, or western cedar.

How do I choose an expansion joint?

For the selection of the most suitable PosiFlex expansion joint, the following basic criteria must be determined:

  1. Size – joint nominal bore size, required face-to-face length and mating flange size/specification.
  2. Pressure – operating, design, surge and test pressure of the system.

What is the difference between a control joint and an expansion joint?

Control joints can be isolated within the plane being treated (brick facades, concrete sidewalks) while expansion joints must bisect the entire structure thereby creating a gap throughout all of the building elements—foundation, walls, curtainwalls, plaza decks, parking decks, floors, and roof.

What are the types of expansion joints and write in detail about it?

Toroidal expansion joint. Gimbal expansion joint. Universal expansion joint. In-line expansion joint.

What are expansion joints made of?

Expansion joints are usually made from metal, rubber, or braided. (Braided stainless steel hoses with flexible or metal liners are not expansion joints.) Metal expansion joints are mostly used in applications with the issue of thermal expansion.

Do rubber expansion joints need gaskets?

Elastomeric expansion joints are supplied with flanges of vulcanized rubber and fabric integrated with the tube, making the use of gaskets unnecessary. The sealing surfaces of the expansion joint equalize uneven surfaces of the pipe flange to provide a fluid and gas-tight seal.