Crane Currency's website indicated that it uses material from this company; however, the company's specialty paper is advertised as a special paper, similar to hybrid paper but 100% cotton. So technically, the paper is called Endurance AST®. According to the website, it would be a type of cotton paper treated with a substance. This is characteristic of varnished paper.
https://www.cranecurrency.com/solutions/paper/
https://www.cranecurrency.com/news-insights/designing-the-future-of-kazakhstan-s-tenge/