Check the listing for details. Urethane / Polyurethane Sheet Block Bar Stock 65D - 2" x 2" x 4" - Blue. Condition: New. Listed at 16.00 USD. MACHINABLE POLYURETHANE / URETHANE BLOCK Polyurethane blocks, bars, and sheet made of high performance, machinable polyurethane. Be sure to send a message if you have any questions or would like to request a quote for a custom sized bar, block, or sheet. ABOUT POLYURETHANE: Polyurethanes are some of the most versatile plastic materials to date. What makes polyurethane incredibly useful is its ability to be molded into a seemingly infinite number of shapes, sizes, and hardness ranges (durometers), allowing it to adapt to some of the most challenging applications. Polyurethane holds the characteristics of both plastic and rubber, making it incredibly durable yet also resilient. The inherent characteristics of rubber and plastic combined in polyurethane allow it to hold up against repeated impact, abrasion, chemicals, and heat, making it the ideal polymer for demanding situations.