Hamilton's classic liquid cast 95 polyurethane tread chmically bonded to heavy duty cast iron center. Outwears rubber 5-10 times and roll easier under heavy loads. Made in the USA
Composition - high grade liquid cast polyurethane
Hardness - 90-95 Durometer (Shore A)
Bashore Rebound - 29%
Elongation at break - 430%
Tensile Strength - 7000-7400 psi.
Tear Strength - 700 pli (DIE C)
Abrasion Resistance - 5-10 times ordinary rubber
Temperature Range: -50°F to +200°F intermittent, 0° to 180F continuous