Johns Manville. Formaldehyde-free MR faced fiberglass batts use a water-based acrylic binder that meets California’s Section 01350 standards. The facing serves as an integral vapor retarder, chemically protected against potential fungi growth. The company claims to obtain its sand from sources close to the manufacturing plant to reduce transportation impacts, and 20% of its recycled content is post-consumer. 800.654.3103.