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Membrane Switch

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Hot pressing type membrane switches 10-year quality assurance

    Main feature:

    the key uses PET material to print the contact surface, and then it is embossed to form resilience

    Advantages: 

    service life over 1 million, with good hand feeling

    Disadvantages: 

    the touch of keys may be weakened by high temperature

    Model:01, 02

    Product applications: 

    computer, automobile, bathroom, electronic equipment.

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Description

Basics of Membrane Switch: Material

There are three main materials used for membrane switch

Material: Polycarbonate (PC)

Advantage:

Temperature resistance – 60 ~ 120 ℃, thickness 0.125 ~ 1.2, smooth surface, high transmittance, environmental protection, low water absorption, good dimensional stability, excellent bending, tensile and compressive strength, excellent heat resistance, cold resistance, electrical insulation and atmospheric aging resistance. It can meet the requirements of most membrane switch panels, and the high transmittance of PC can meet the requirements of LCD window.

Disadvantage:

Chemical resistance (organic solvent) is poor, fatigue resistance is poor, stress cracking is easy to occur, air oxidation is easy to gradually form a falling off layer, determined by the environment, and finally gradually decomposed. The physical damage time is 3-8 years.

Material:Polyester (poly (ethylene phthalate) (PET)

Advantage:

Temperature resistance – 30 ~ 160 ℃ / thickness 0.075 ~ 0.25/smooth, good drug resistance.

It has excellent mechanical properties, insulation, heat resistance, hardness and the largest strength and toughness of thermoplastic, excellent wear resistance and friction resistance, especially with bending resistance and high elasticity, and high dimensional stability.

The tensile strength is comparable to that of aluminum film, much higher than that of PC and PVC. It is the most ideal substrate for making thin film switch circuit. Textured  PET  is the preferred material for membrane switch panel.

Disadvantage:

Insoluble in general organic solvents, not alkali resistant.

Low water absorption.

Textured  PET is expensive.

Material:Polyvinyl chloride (PVC)

Advantage:

Temperature resistance -20~60 ℃ / thickness 0.175~1.5/ smooth surface, stable to acid, alkali and salt under normal temperature. It has good wear resistance, flame resistance and self extinguishing, noise elimination and shock absorption, and good electrical insulation.

Disadvantage:

Poor thermal stability.

Parameters
Electronic characteristics:
Circuit level:35V (DC), 100mA, 1W
Contact resistance:10 Ω ~ 500 Ω (varies according to the length and material of outgoing line)
Insulation impedance:100M Ω 100V
Dielectric withstand voltage:no breakdown or flashover after 250V RMS (50-60Hz 1min) test
Contact jitter time:≤ 5ms
Service life:plane type ≥ 5 million times
Touch type:≥ 1 million times
Mechanical properties:
Operating pressure:plane type 57 ~ 284g (2 ~ 10oz)
Tactile type:170-397g (6-14oz)
Switch stroke:plane type 0.1 ~ 0.5mm
Touch type:0.6 ~ 1.5mm
Environmental parameters:
Operating temperature:plane type (including shrapnel) – 20 ℃ ~ + 80 ℃
Convex type:– 20 ℃ ~ + 60 ℃
Storage temperature:plane type (including shrapnel) – 40 ℃ ~ + 80 ℃
Convex type:– 40 ℃ ~ + 60 ℃
Humidity:40 ℃, 90% – 95%, 240 hours

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