PVB To make ethos , we were the first to harness the potential of PVB from recycled windshields and safety glass over 10 years ago. A high-performance alternative to traditional carpet backing materials, ethos is time-tested and maintains durability for decades using responsibly sourced, recycled materials. ® [Stands up to subfloor conditions of 15 lbs MVER, 98% RH and 11.0 pH. Passes 10,000 impact moisture penetration testing.] TIME-TESTED INNOVATION FOR THE FUTURE OF FLOORING