An article by Jaroslav Klima – asma sales

Asma always puts in a lot of effort in order to cooperate with our customer so that the product is perfectly tailored to their needs. Also, in the case of newly designed spring elements for the use in the mining industry, we cooperated well. The results are quite remarkable:

In principle, spring elements are used to conserve energy. Made from polyurethane elastomers, they exhibit an increased efficiency compared to the alternatives made from rubber.

Despite the fact that the component´s size was reduced by 30%, the efficiency could be raised to satisfying 120%.

Moreover, the spring elements show an outstanding resistance to mechanical and chemical stress in many application areas.

„Despite the fact that the component´s size was reduced by 30%, the efficiency could be raised to satisfying 120%„.
Jaroslav Klima

Did you know?

Dampers and springs


  • Polyurethane plastics can be formulated as to exhibit either dampening (energy-absorbing) or springy (energy-conserving) characteristics
  • Compact (non-foamed) polyurethane elastomers show a constant volume because of their viscoelastic behaviour and can be deformed up to 30% in continuous operation
  • Foamed polyurethane elastomers are compressible and exhibit no lateral strain up to a deformation of 30% and can be deformed up to 80% in continuous operation
  • Springs and dampers made from polyurethane elastomers are resistant to humidity and corrosion in comparison to metals


  • Spring elements are used to conserve energy (hold-down devices and ejectors in punching tools)
  • Swinging elements in screening machines, rubber-metal elements, form elements and cushions, pickers…)
  • Damping elements to absorb energy (end stops, impact buffers, bump stops…)

Available at asma

  • Customer specific components according to drawings and models
  • With dampers and springs, our customers can choose between compact polyurethane elastomers in a hardness range from 30 to 95 Shore A and polyurethane elastomers with a density of 450-900 kg/m3
  • Dampers and springs can:
  • be produced using semi-finished goods or moulds
  • be produced adhering to metals
  • receive force progression by a geometric mould design