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Polystyrene film is extruded flat and free from pin-holes. Film is made from polystyrene granules by extruding heated tube of polymer which is then spread out and stretched state. Heat treatment is given above relaxation temperature after winding film with aluminium foil electrodes. This ensures that the film contracts firmly into contact with electrodes and voids are eliminated. During manufacturing, it is necessary to use dust proof room.
Specifications
Range of values up to 1μf
Power factor 0.0002
Operating voltage 100V
Temperature coefficient -100 to -200ppm/0C
Applications:
(1) Radio frequency tuned circuit.
(2) As storage capacitors in digital equipment.
(3) In measuring equipment of ionization current of radioactive materials.
(4) In dosage measurement in X-ray therapy.
(5) In long time constant circuits.
The loudness of sound depends on: Amplitude of vibration. Area of vibrating body. Distance from the sounding body. Density of the medium.
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