These are elements that are located at the base of the cups and on which the concrete blocks are supported. It is where they act as a vibration absorption element.
They are made of vulcanised rubber from the recycling of truck tyres, which is bound, through the use of a binder (usually isocyanates or polyurethanes) and a production process, in which heat and pressure are applied, for a certain time.
To ensure the good quality of the products installed on the railway networks, there are a number of European standards, which indicate the demanding tests that these must pass.
The pieces manufactured by Junta3, comply perfectly with the European standards applied to this type of product.