The DuroBlock Spacer Blocks can be designed to duplicate your current block designs and then mass-produced.  The advantages over the rubber block, it does not require a large solid block of chemically treated wood, and it is made from recycled material. 

For testing purposes the DuroBlock spacer block is mounted to a test I-Beam for impact testing.  The results of this test were compared with the results of using a wooden spacer block. 

The test vehicle rams the guardrail mounted to the DuroBlock spacer block

The collision is monitored with several high-speed cameras to document the impact and to study the results. 

As expected, the support I Beam was damaged and the DuroBlock spacer block received minimal damage.