For more than 59 years Leister Process Technologies has been developing, building and marketing plastic welding and hot air equipment for all applications; from complex industrial systems to straight forward hand welding tools.  Leister has maintained its lead in this sector for many decades.  Founded in 1949 by Karl Leister the company has worked it's way up to become the worlds leading manufacturer of Hot Air Plastic Welding equipment and Industrial Process Heat, and makes up 95% of the worldwide market. Leister has a network of 120 Sales & Service centre's worldwide including Welwyn Tool Group Ltd who have followed the company since 1952.

All Leister Tools are manufactured by hand at their factory in Sarnan, Switzerland. The establishment and development of two additional divisions at the end of the last century strengthened Leister's leading position in hot air technology; its high tech laser systems and soldering equipment for electronic components proved to be particularly successful in many varied applications across the industry.