This pocket book pursues the aim of contributing to international comprehension of the most diverse sectors of this relatively heterogeneous field of seals and gaskets. In addition, this book is also intended to explain highly specialized seal and sealing terminology in English to trainees, apprentices and students in technical fields and disciplines, but primarily to address commercial employees, technicians and engineers who are confronted with the problems of seals and gaskets for the first time and are not yet familiar with the terminology of the specialized field but have a need to communicate in this field in the context of international negotiations and on multilingual project sites around the world.