An RF design engineer in the aerospace industry specified PCTFE as a dielectric material for use in cryogenic condition radomes. During laboratory testing, inconsistent electrical properties between material batches was revealed. A Curbell technical expert noted that varying levels of crystallinity is common between batches of PCTFE which will alter the electrical properties of the material. DuPont™ Vespel® was recommended for consistent electrical property performance Curbell recommended DuPont™ Vespel® polyimide for testing. The crystallinity of DuPont™ Vespel® shapes is well-controlled and batch-to-batch electrical properties are known to be consistent. The engineer was able to qualify DuPont™ Vespel® as a suitable dielectric material due to its performance during testing. The manufacturer continues to use this same material today and is extremely satisfied with the consistent performance of the finished radome. Need Material Expertise? We can help. Our technical experts can help you find reliable plastic options for your applications. Call 1-800-553-0335 | Ask an expert | Explore our materials