DELETE: Tear and T-Peel Testing of Vulcanized Rubber and Thermoplastic Elastomers (ASTM D624)

This part of ASTM D 62400 specifies the test conditions for measuring the tear strength of conventional vulcanized rubber and thermoplastic elastomers. There are five different specimen geometries covered in this standard and testing procedures vary depending on which specimens are being tested. Testing parameters for specimen types A, B and C are similar to one another but differ for specimen types T and CP, particularly in speed.

Tear strength is calculated by dividing the peak or maximum force by the median thickness for specimens A, B and C.  For specimens T and CP, the mean, peak, valley or the median force is divided by the median thickness.  Since tear strength is dependent on thickness, it is important that a proper measuring device is used.  Micrometers must comply with ASTM D 3767 when testing to this standard.  

 

In addition, suitable grips and grip faces are required to successfully test these materials. Pneumatic side acting grips along with serrated or rubber coated jaw faces are the preferred gripping solution. Pneumatic side acting grips apply a constant gripping force regardless if specimen thickness changes during the test. Constant clamping pressure is often necessary to prevent specimen slippage for specimens with relatively high elongation.  A typical testing system would comprise of a 3300 series or 5500 series universal testing machine along with Bluehill® Software

 

It is important to read and review the standard to which are you testing in order to fully understand the test setup, procedures and results requirements.

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