Crypton is UFAC Class 1, and it passes the normal Cal. 117E and NFPA 260 requirements. Crypton can be treated to pass Cal. 133 (with components), IMO RES 16-52A, CRIB 5, Boston and New York Fire Codes, automotive FMVSS302 requirements, and aviation FAR25-853.
The test for breathability (ASTM-E96) measures the amount of vapor that can pass through the fabric. The pores formed in Crypton’s treatment are large enough to let water vapor pass through but small enough to keep water out.
SOURCE: Crypton, LLC. Website