Graphic Overlay:

A graphic overlay, or membrane switch overlay, is the outermost layer of the membrane switch assembly. It is the intuitive part of an electronic interface that connects the user to the machine, device, or equipment; and the part of the membrane switch which is visible to the user, graphically defining the locations of the keypads,and explaining the operation of the equipment. For these reasons, the graphic overlay plays a significant role indefining the user experience.

A well-designed graphic overlay makes a powerful first impression of your company and your equipment. The design of the membrane switch overlay will set your equipment apart from the competition by providing an unsurpassed user experience.

Not only must the graphic (membrane switch) overlay explain the operation of the equipment, it must satisfy aesthetic requirements, and more importantly, environmental and physical end-use application requirements. 

Environmental Considerations Affecting Graphic Overlay Design & Material Choice.

Indoor Use vs. Outdoor Use UV, extreme temperatures, humidity, and moisture all threaten to degrade and shorten the useful life of the membrane switch. Chemicals and Abrasion Industrial chemicals and/or cleaning agents can damage the graphic overlay material. Care must be exercised to choose a material that withstands these chemicals.

Sterile Environments Sterile environments may require an overlay material with anti-microbial properties that inhibit bacterial growth, as well as endure harsh cleaning agents.Low Light vs. Bright Light Some artificial and natural lighting can cause glare that makes the overlay difficult to interpret and is strenuous on the eyes.

Pannam offers overlay material in a range of gloss and antiglare levels to maximize the readability of your membrane switch overlay.

Heavy Use and Abuse In environments that are subject to heavy operator use or even abuse, it may be necessary to specify a graphic overlay material that can withstand such misuse. Instead of a typical 0.188mm thick polyester keypad overlay, it may be more suitable to utilize a more robust membrane switch overlay material such as:

0.125-0.188mm PET (EBG180 EBG130)

0.125-2mm matt PC or F150 F200  

0.5-3mm acrylic

0.3-2mm stainless steel

Basic Properties:

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