Hopefully not too much off-topic, but Cricket (of Otter Bay) recently posted some views on Rubatex:
Many years ago, we preferred Rubatex G231 neoprene for our drysuits, as it was nitrogen blown, not air blown like many neoprenes today. It did not compress as quickly as the stuff we used for wetsuits. Unfortunately, we had a huge lamination problem with them the last few years we were using their material, with suits coming back as bare neoprene, from the fabrics falling off. Jeff and I tried so hard to help them solve the problem, but they wouldn't listen. We'd order five sheets, and have to send three back after hours of inspection.
After a while, they shut down everything for a period of time, and when they reopened, they invited us back, but we needed to meet their minimum quota, which was impossible for us, being that we are such a tiny business!!