HR Polyfoam Sheets

High-resilience (HR) Polyfoam is an open-cell polyurethane foam with fire-retardant properties used primarily for seat cushioning in transportation applications. Its low density, low thermal conductivity, and strong mechanical properties also contribute to its excellence as a thermal and sound insulator. Long-lasting, versatile, and comfortable. Sold in 55" x 41" sheets. HR 32 is also sold in rolls with and without scrim. NOTICE: We are phasing this product from 55" x 41" to 72" x 36". As the 55" x 41" stock depletes below, it will not be replenished. If we are out of stock in the 55" x 41" in the drop-down below, please choose the 72" x 36" option. Specifications Grade Density (pcf) Firmness (ILD) (4" thick, 25%) Firmness (ILD) (4" thick, 65%) HR 32 2.6 32-38 65-86 HR 55 2.8 51-59 120–156 HR 70 3.2 69–79 165-190 Flammability Standards HR Polyfoam has been tested to meet the following flammability standards: California Technical Bulletin 117 FMVSS-302 (Automotive Flammability) 14 CFR (FAR) 25.853(a), Vertical Burn Compatibility   This product meets and exceeds automotive flammability standards. • This product is acceptable for use in all types aircraft and rotorcraft. • Will pass the 14 CFR 25.853(c) Oil Burn for Seat Cushion when paired with a suitable fire blocking fabric, such as the Bramport ProTM Fireblock Fabric. This product is acceptable for use in marine interiors, but is not water resistant or repellent. It is highly buoyant with the use of a water-blocking layer. Unknown at this time whether this material is acceptable for use in Railway applications.