Elastomers are a b****
They are perhaps the worst "innovation" to come to mountain biking. They are big nitrogen infused urethane tubes that are jammed into a fork. They also degrade really fast, I have a '91 diamondback apex with anti gravity front suspension and the previous owner used the wrong type of lube. I ended up scooping 20 yr old urethane clay out of the fork with a spoon.