用于350F应用的双马来酰亚胺（BMI）模具提供了制造复合材料结构所需的质量、长期可靠性和精度。诺斯罗普的一个开发项目旨在收集足够的数据，为未来的项目决定一个工具系统，该项目已经进入第三年。四个由四种不同材料制成的复合固化夹具和控制面板几乎每天都在高压釜中循环。根据从该项目收集的热稳定性和循环数据，BMI被证明是最佳的350F复合材料模具系统。诺斯罗普的许多项目正在大规模实施GR/BMI工具。 这项新技术表明，叠层复合材料刀具可以是精确且长寿命的刀具。

BISMALEIMIDE (BMI) TOOLING FOR 350F APPLICATION PROVIDES THE QUALITY, LONG TERM RELIABILITY, AND ACCURACY REQUIRED FOR THE MANUFACTURE OF COMPOSITE STRUCTURES. A NORTHROP DEVELOPMENT PROJECT DESIGNED TO GATHER SUFFICIENT DATA TO DECIDE ON A TOOLING SYSTEM FOR FUTURE PROGRAMS IS WELL INTO ITS THIRD YEAR. FOUR COMPOSITE CURE FIXTURES AND CONTROL PANELS FABRICATED FROM FOUR DIFFERENT MATERIALS ARE BEING CYCLED IN THE AUTOCLAVE ALMOST DAILY. BASED ON THERMAL STABILITY AND CYCLE DATA COLLECTED FROM THIS PROGRAM, BMI IS PROVING TO BE THE OPTIMUM 350F COMPOSITE TOOLING SYSTEM. IMPLEMENTATION OF GR/BMI TOOLING IS PROCEEDING IN LARGE SCALE NOW IN MANY OF NORTHROP'S PROGRAMS. THIS NEW TECHNOLOGY IS DEMONSTRATING THAT LAMINATED COMPOSITE TOOLS CAN BE ACCURATE AND LONG-LIFE TOOLS.