Foam Glossary

Hard facts about a soft material

The terms are listed in alphabetical order:

Dynamic load : The dynamic load – which is a load applied in motion – occurs, for example, when PUR foam is used for furniture, mattresses or in elevation beds. PUR foam’s resistance to dynamic impression depends on many factors, such as weight, hardness and foam type.

Dynamic fatigue : A PUR foam test which yields a result in the form of a thickness and hardness loss achieved through impact testing at a constant load. The result of the test can be used, for example, to evaluate the suitability of materials as padding in furniture and vehicles.

Hardness : The foam’s hardness is determined in part by the bulk density, but varies greatly with various additives that make the foam harder or softer. Hardness is measured in Newtons.

Hardness loss : Hardness loss is a test value produced after the dynamic fatigue test.
The hardness loss indicates the loss of hardness that occurs when PUR foam has been exposed to impact testing at a constant load, compared to the foam’s original hardness. The hardness loss is stated in per cent.

PUR foam : Polyurethane foam. Carpenter only produces flexible polyether foam. The difference from other types of foam lies in the chemical composition of the foam.

Density : Density specifies the foam’s weight per m3. Density has a major impact on quality, price and lifetime. The rule of thumb is that the higher the density, the better the quality and lifetime, and the higher the price.

Static load : The static load, which is a constant load, occurs when PUR foam is used for packaging, or as carpet backing, etc., where it is subject to constant pressure (e.g. from table legs). PUR foam’s resistance to static impression depends on many factors, such as weight, hardness and foam type.
 
Do you have any questions about these technical terms?
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