TEAR STRENGTH

 

To measure the resistance to traction and tear

The traction and tear tests are very important tests to determine leather resistance. The leathers need to have good resistances due to the stress on them from the different phases of manufacturing and daily use.

The instrument used to determine these resistances is the Tensometer.

The tear test allows us to compare the capacity of the leather to resist before tearing apart. The test-piece is fixed on the tensometer clamp and placed in traction up to break-up; in this way we measure the break-up load, in other words the maximum load needed to tear it.

 

The recommended values for tear strength, according to the current European Standard, is as follows:

Upholstery - Min 20 Newton

Car upholstery - Min 25 Newton

 

The traction and stretching test allows us to compare the capacity of the leather to withstand being stretched and its deformation capacity before the break-up.

The test-piece in examination is clasped by special hooks and placed in traction up to break-up. In this way, we measure the break-up load and how much the piece has been lengthened until its breaking (maximum length).

The recommended value for strength, according to the current European Standard, is as follows:

Car upholstery: Min 12N / mm2 for the traction lengthening between 35 and 60%