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Shoe Sole Units

A sole unit is the part of a shoe that is located under the foot and makes contact with the ground. It is typically made of a durable, flexible material such as rubber or polyurethane and is designed to provide cushioning, support, and traction for the wearer.

The sole unit is an important component of a shoe, as it helps to protect the foot from the impact of walking and running, and it helps to improve the stability and comfort of the shoe.

Shoe Sole Units

Sole Unit Bonding Advice

When cementing sole units, different steps should be taken, depending on the sole’s compound and the material to which the sole is going to be cemented to. Below is a guide on how to best work with various materials.


Identifying the Materials

The first step in the choosing the correct adhesive is to identify the material to be cemented, differentiating between PVC, rubber, leather, PU, TR, and plastic.

Prepare the Surface

Using heavy grit sandpaper, buff the soles and/or heels to be replaced, as well as the part to which the new Vibram product is to be applied. Remove all surface dust and apply a thinner,  especially if the surface is oily. We suggest following these processes, even if the product is pre-buffed.

Apply the Adhesive

Be sure the adhesive is applied within 72 hours of buffing.

Drying times

There is an inverse relationship between temperature and drying time: if temperature increases, then the drying time decreases. Therefore, at high temperatures, the drying process will quicken.

There is also an inverse relationship between dampness and drying time. If dampness increases, the drying process will slow. Attention also needs to be paid to external temperature. Adhesives which have been exposed to cold during shipment or storage should be left at room temperature for several hours before being used.

Opening time

An adhesive must be left “open” for it to harden. Temperature and dampness affect the “opening time.” Due to absorption, some expanded materials may also require a second layer of adhesive to be applied. Be sure adequate adhesive is visible on the surface.

Additional points to remember:

  1. If the product is put into a press, ensure that there is enough pressure to achieve perfect fusion of the materials.
  2. Leave the product in the press for at least 15 seconds in order to obtain a sufficiently strong bond.
  3. If the opening time has expired, the adhesive can be reactivated with heat. This can be achieved by means of a heat lamp, stream, or heat gun.
  4. Before moving on to the finishing stage, wait several hours to prevent possible reactivation of the glue and therefore possible detachment.