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PureAClean blue, non-marking, NON ESD SAFE 1/4" (6.35 mm) diameter vacuum cup.  The vacuum cup material is PureAClean, a catalytically cured silicone based rubber compound.  This cup material is ideally suited for handling residue sensitive items such as lenses or optical filters. 

Operating temperature limits (-65^oF - 480^oF) (-55^oC - 250^oC).

Electrical properties: Greater than 10¹³ Ohms.

Lifting capacity at 6 In Hg:   60 g (2 oz)

Lifting force is directly proportional to the vacuum level and the surface area of the vacuum cup being used .