Cookson Electronics Semiconductor Products (CESP) is the business unit within Cookson Electronics that is completely focused on the needs of the semiconductor packaging industry.Cookson Electronics Semiconductor Products ......Cookson Electronics Semiconductor Products (CESP) is the business unit within Cookson Electronics that is completely focused on the needs of the semiconductor packaging industry.Cookson Electronics Semiconductor Products (CESP) is a leading supplier of innovative, high performance materials, tailored to the needs of the leading semiconductor packaging manufacturers and delivered with knowledgeable applications expertise. Our products enable our valued customers to meet the evolving and demanding needs of the industry.