
 Polyethylene, Melt index, Density, ESCR, Impact strength, Flexural modulus, HDPE, LLDPE, MDPE, HMWPE, LDPE (Site not responding. Last check: ) 
  Modulus of rigidity is related to Young's modulus by the equation: E = 2G (1 + r) where E is Young's modulus (psi), G is modulus of rigidity (psi) and r is Poisson's ratio. 
  Alternate terms are modulus of rigidity and modulus of elasticity in shear. 
  Tensile modulus of elasticity is approximately equal to compressive modulus of elasticity within the proportional limit. 
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