Polymethacrylimide， PMI Foams Advanced Composite Material Sandwich Core Material

Rifeng® A is a closed-cell rigid foam base on Polymethacrylimide (PMI) polymer, that is completely free of CFC’s. It's with Coarse Cell Size. Excellent machinability and surface adhesion, As sandwich structure material, it has good fastness to be combined with skin.   Rifeng® A has been designed for use primarily in aerospace applications. Its outstanding properties make it an ideal material solution for aircraft components, including stringer structures in pressure bulkheads. This structural foam is also suitable for helicopter applications and is frequently used in the main and tail rotor blades, as well as fuselage panels.   Processing and Production Rifeng® A foam is suitable for both prepreg processing and vacuum infusion. The processing temperature from 130℃ up to 180℃ and maximum pressure up to 0.7 MPa. Curing method options include autoclave, vacuum bagged, RTM, VARTM and press, etc. Using a Rifeng® core 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® A has a closed cell structure that ensures the resin stays exactly where you want it – in the interface. This eliminates excess and unnecessary resin that adds undesirable weight to the finished part.   Thermoforming and Shaping Rifeng® A 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® 52A Rifeng® 72A Density Kg/m3 52±5 72±8 Compressive Strength MPa 0.9 1.5 Compressive Modulus MPa 50 70 Tensile Strength MPa 1.6 2.6 Tensile Modulus MPa 67 115 Shear Strength MPa 0.8 1.3 Shear Modulus MPa 29 43 130℃ Compressive Strength MPa 0.7 1.1 130℃ Compressive Modulus MPa 32 44 Heat Distortion ℃ 180 180 * 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® A Rifeng® Size (mm) Standard Sheet Thickness (mm) 52A 2500 x 1250 3~80 72A 2000 x 1250 3~110 * 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.