Home  | Group Profile  | Product & System Integration Service  | Electronics Manufacturing  | Components Mfg.  | Services & Support  | News  | Contact Us

   Mechanical Consideration

Typical key structure: 1)Key Travel ----------------------- 0.25 ~5.0mm.  2)Actuation Force ------------------ 20 ~ 350 grams 3)Operating Life -------------------- 1 million        (typical), 10 millions (special) 4)Operating Temperature ---------- -30?/font>C ~     150?/font>C 5)Storage Temperature ------------- -42?/font>C ~     175?/font>C 6)Printing Range Slope ------------- +/- 0.5 mm

    Chemical resistance:
   Silicone rubber keypads can safely be exposed to the following materials:  

Solvents Acids	5% Hydrochloric acid
Acetone	5% Nitric acid
Alcohol	5% Phosphoric acid
Mineral spirits	10% Sulfuric acid

   Dimensional tolerances:
   Contact us to determine if more precise tolerances are available for your critical 
  design   
 

V	Precise (+/-)	General (+/-)
6.50mm or Less                                  0.15mm                        0.25mm    6.50mm -10.0mm or Less                      0.20mm                       0.30mm     10.0mm - 16.0mm or Less                     0.20mm                       0.40mm    16.0mm - 25.0mm or Less                     0.25mm                       0.50mm    25.0mm - 40.0mm or Less                     0.35mm                       0.60mm     40.0mm - 63.0mm or Less                     0.40mm                       0.80mm     63.0mm - 100.0mm or Less                   0.55mm                       1.10mm    100.0mm - 160.0mm or Less                  0.70mm                      1.30mm    160.0mm and up                                      0.5%                     0.8

   Actuation force tolerances:
   

V	Precise (+/-)	General (+/-)
40-60                             15                                  20                      75-100                            20                                 25                     100-150                          25                                 30                     150-200                          25                                 35                      200-300                          35                                 40

   Typical tolerance for actuation force is +/- 20 grams.
   Optimum actuation force for best key performance is 50-150 
   Conductive rubber switches can be successfully designed and 
   manufactured with actuation force ranging from minimum of 10 grams
   to a maximum of 400 grams.
   Samwell has developed the Four Barrel Automatic Compression Molding 
   Machine that enable keypads to be manufactured utilizing far less manual 
   labor than in the past since 5-6 years ago - Four large canisters 
   automatically feed the raw silicone rubber directly into the mold. 
   This eliminates the costly pre-stripping, weighing and hand insertion of material. 
   Customers should consider this process for high volume multicolor keypads. 
   
   Benefits of Multi-barrel Mold: 

   1)Up to four colors automatically injected into mold (less handling, no additional 
      molding of insert keys)

   2)More efficient out gassing which translates to better shielding of customer
      induced oil migration

  3)Quicker molding cycles since introduction of material in the mold is not a manual   
     operation

  4)Less possibility of contamination due to dust, dirt, etc (especially important with 
     translucent keypads)

  >Silicone rubber keypad

  >Custom Keyboard and Input Device

  >In-Mold Decoration (IMD) Parts

  >Housing and Parts

     >Magnesium Alloy
 
     >Co-molding

     >Plastic

  >Passive Components and Fasteners