I would appear that you can buy it on Alibaba:

https://www.alibaba.com/trade/search?tab=all&SearchText=asbe...

I have not tried, although I was tempted just out of curiosity -- would it make it through customs and get delivered to me in the US ? The rope and fabric style products should not be that dangerous because they are long fibers that should not break off and float in the air, and the cylinder head gasket material is probably chopped short fibers but it's embedded in a matrix of other stuff.

We probably over regulate the long fiber stuff. The short felt-like fibers we used to mix into plaster, cement, anything needing strength and texture, are probably correctly banned; the risk to reward seems not worth it. Many of those products could use glass fiber just as well.

However, I think the general experience of people exposed to rock or cement dust, basically anything silica based that gets into the lungs, is that is really bad. Handling short chopped mineral fiber of any type seems like something that has to have a huge payoff, like part of a rocket for satillite launches, to be worth it.

This is good to keep in mind because there are some really interesting alternative mineral fiber products out there. Basalt fiber in particular, is sold in a chopped mix for adding to concrete, seems potentially bad. There are some interesting ceramic fibers available too.

https://www.alibaba.com/trade/search?tab=all&SearchText=basa...

https://www.alibaba.com/trade/search?tab=all&SearchText=cera...