AASHTO provides us 'Elastomeric Bearings' Compressive Stress (psi) / Compressive Strain (%) charts for Durometers 50 and 60 for Shape Factors 3 thru 12. You should be able to calculate the modulus of elasticity based on these charts.
For example - for Durometer 50, Shape Factor 5,
Compressive Stress = 500 psi
Compressive Strain = 5%
So, E (modulus of elasticity) = Stress / Strain = 500 psi / 5% = 10,000 psi
I believe the modulus of elasticity should be same for tension and compression.
What is the modulus of elasticity of Neoprene 50A durometer hardness, ASTM D 2240?
Is the modulus of elasticity same for tension and compression?
Sid Lakhani, PE