RUBBER-KU Table E rubber gasket is a mechanical seal used to prevent leaks of liquids or gases, or as a barrier between two objects. It's also known as a rubber flange gasket. 

Here are some more details about Table E rubber gaskets:

• They are available in various sizes, including 50 mm, 65 mm, 80 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350mm, 400mm, 450mm, 500mm, 600mm and custom made.
   
• They are a type of full-faced gasket, which means the gasket retainer extends out to the flange's outside diameter. 
   
• The gasket has precision cut bolt holes to accommodate threaded studs and sleeves. 
   

Gaskets are commonly used as static seals to prevent leaking between two components or flanges that have flat surfaces. They are different from seals, which are used between engine parts, pumps, and shafts that rotate.