Fabrication and Characterization of Natural Rubber-Based Magnetorheological Elastomers at Large Strain for Base Isolators

Table 2

MRE samples with carbon black and naphthenic oil.

Iron volume fraction (%)	Carbon black (phr^a)	Naphthenic oil (phr)	Isotropic
35	20	20	○
	40	20	○
	60	20	Synthetic failure (too tough)
	20	40	○
	40	40	○
	60	40	○

phr: parts per hundred resin (mass proportion to rubber).