High Mechanical Properties PMI Foam, Sandwich Core Material,composite Sandwich Structure

Rifeng® C-HT is closed-cell rigid foams which base on polymethacrylimide (PMI) polymer. It does not contain any CFC’s. And is engineered to meet extreme and demanding processing requirements. It's with Coarse Cell Size.   Of all the Rifeng® PMI foam grades, C-HT is the grade that is best suited to withstand the most demanding process conditions.The processing temperature can be up to 180℃ - 200℃ and max pressure up to 0.5 Mpa - 0.7 Mpa (dependent upon density).   These extreme properties make Rifeng® C-HT the ideal foam for use with Bismaleimide (BMI resins), Epoxy, Cyanate ester and other resins.   Processing and Production Rifeng® C-HT PMI foam is suitable for the processes of autoclave technologies, vacuum infusion, RTM, VARTM, etc. Weight Saving Rifeng® C-HT featuring a fine cell structure, make sure it takes up minimal resin at the surface where the cells have been cut open during core shaping. Less resin take-up during part processing means lower final part weight and reduced overall cost. Thermoforming and Shaping Rifeng® C-HT 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® 75C-HT Rifeng® 110C-HT Density Kg/m3 75±7 110±11 Compressive Strength MPa 1.8 3.4 Compressive Modulus MPa 65 135 Tensile Strength MPa 1.8 2.9 Tensile Modulus MPa 140 195 Shear Strength MPa 1.2 2.6 Shear Modulus MPa 45 85 200℃ Compressive Strength  MPa 0.6 1.5 200℃ Compressive Modulus MPa 20 65 Dielectric Constant / 1.10 ① 1.14 ① Dielectric Loss Tangent  / 0.0045 ① 0.0047 ① Heat Distortion ℃ 200 200 ① Test Frequency:4.3GHz * 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® C-HT (mm) Rifeng® Size (mm) Standard Sheet Thickness (mm) 75C-HT 2500 x 1250 3~80 110C-HT 2200 x 1100 3~70 * 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.