GRAPHIC OVERLAY
 The graphic overlay is an integrate of the membrane switch,it is the most visible portion of the switch assembly,displaying colors,graphic panel as well as switch locations for operation.it is also protection for an environmentally hostile application .Only ones imagination and budget limit the range of decorative options .Graphic material can be used Polyester,Polycarbonate,or PVC
Material

Temperature rating

Thickness                Characters
Polyester -30-120¡æ 0.1-02mm

1)Dimensional stability

2)Thermal stability at elevated temperature

3)Coefficient of friction

4)Tensile break strength

5)Tensile yield strength

6)Elongation at break

7)Chemical and electrical resistance

8)High dielectric constant

9)Lower extractable content

10)High electrical breakdown voltage

Polycarbonate -60-120¡æ  

1)High transparency 

2)High strength making it resistant to impact and facture

3)High heat resistance making it ideal for application that require that require sterillization

4)Good dimensional stability which permits it to retain   its shape in a range of conditions

5)Good electrical insulation properties

6)Biologically insert  

7)Readily recyclable

8)Excellent processability 

9)Cost effective

    PVC   60 ¡æ 0.175-0.5mm

1)High strength      

2)Dimensional stability

3)Good weather resistance 

4)High impact strength

5)Clarity                 

6)Colorability

7)Flexible or rigid       

8)Chemically insert

9)Ease of fabrication

10)Tasteless,odorless,non-toxic

11)Good electrical properties