High Heat Resistance PMI Hard Foam, Sandwich Core Materials

Rifeng® WF is a closed-cell rigid PMI foam base on Polymethacrylimide (PMI) polymer, that is completely free of CFC’s. It's light yellow with Medium Cell Size.   Rifeng® WF is the most cost-effective industrial grade product in our range of rigid foams. With excellent mechanical property and is suitable for a wide variety of applications.   Rifeng® WF PMI foam core material can deliver an ideal solution for sports and leisure equipment. It provides excellent bending stiffness and strength, and stabilization of the very thin FRP sheets that face extreme external forces. Outstanding tensile load and a high tenacity characteristic, make it the perfect choice for sports and leisure equipment which with substantial dynamic mechanical loads.   Rifeng® WF PMI foam is self-extinguishing. As a structural core material, particularly suitable for applications in rail vehicles and watercraft.   Rifeng® WF PMI structural foam cores also ideal choice for wind energy industry. It provides all the stiffness, robustness and durability required in composite structures at a fraction of the weight of other core materials. Even with a low density, Rifeng® WF provide excellent mechanical properties, reduces the weight of wind turbine blades and the manufacturing costs. Processing and Production Rifeng® WF is suitable for fiber-reinforced plastic (FRP) prepreg processing and vacuum infusion at temperatures up to 130 °C. Curing method include autoclave, RTM, VARTM and press. Using a Rifeng® WF PMI foam core material makes it possible to produce sandwich components in a single step (co-curing), resulting in reduced overall production time. Weight Saving When building composite sandwich components, lightweight Rifeng® WF has a closed cell structure that ensures the resin stays exactly where you want it – in the interface. This eliminates excess and unnecessary resin. Less resin take-up during part processing means lower final part weight and reduced overall cost. Thermoforming and Shaping Rifeng® WF can be easily thermoformed or CNC machined to meet customer requirements. High precision, pre-shaped and ready-to-use foam cores in simple or complex geometries can also be supplied by us. Basic Property Property Unit Rifeng® 52WF Rifeng® 75WF Rifeng® 110WF Density Kg/m3 52±5 75±7 110±11 Compressive Strength MPa 1.2 1.8 3.5 Compressive Modulus MPa 55 85 145 Tensile Strength MPa 1.6 2.7 4.3 Tensile Modulus MPa 85 95 180 Shear Strength MPa 0.9 1.4 2.4 Shear Modulus MPa 25 36 68 130℃ Compressive Strength MPa 0.9 1.3 2.2 130℃ Compressive Modulus MPa 36 55 86 150℃ Compressive Strength MPa 0.8 1.1 1.5 150℃ Compressive Modulus MPa 35 51 61 Dielectric Constant 1.06 ① 1.11 ① 1.12 ① Dielectric loss tangent 0.00 ① 0.00 ① 0.01 ① Heat Distortion ℃ 180 180 180 ① Test Frequency: 4GHz * Technical data values presented are typical for nominal density, subject to normal manufacturing variations.  * Density values are valid for full-size sheets with a minimum thickness of 10 mm(0.39 inch) only. Other density ranges are available upon request.  Sales range for Rifeng® WF Rifeng® Size (mm) Standard Sheet Thickness (mm) 52WF 2500 x 1250 1 ~110 75WF 2500 x 1250 1 ~ 80 110WF 2200 x 1100 1 ~ 70 * All dimension ranges presented in these tables are standard. To discuss any size or thickness not listed, please contact a Rifeng® representative. * Length width tolerance ± 10 mm, thickness tolerance ± 0.5mm.