Bakelite Reaction Lab Report
Environmental Effects
Bakelite is extensively used for making electrodes for RPC (resistive plate chambers) [1] [2].All the electrodes which are made up of Bakelite have changing value of resistivity i.e. all the Bakelite electrodes are variable resistors [1]. But we can modulate the value of resistivity through water [1], [4]. Bakelite resistivity has a strong dependence on temperature as well as on humidity. [2]
Dependence on Humidity
Basically, Bakelite resistivity is strongly affected by the humidity and it is a slow process because several months are needed in order to stabilize the value of Bakelite’s resistance. Bakelite resistivity is inversely proportional to the humidity. By the increase in humidity, its resistivity decreases. [1], [2], [4].
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[2] Fig.
They performed two measurements.
Firstly, they monitored the Bakelite’s resistance while humidity was changing fastly at constant temperature and monitored resistance while changing temperature at constant humidity. [2]
Secondly, they measured the Bakelite’s resistance while temperature was changing in the range 15-35 C at discrete values of humidity 20%, 55% and 80%.[2]
Results
According to Fig.2,
• As humidity decreases from 80% to 55%, the resistance increases to 50M ohms.
• As humidity decreases from 55% to 20%, the resistance increases of factor ~22.
• As humidity increases from 20% to 55%, the resistance decreases to 70M ohms.
According to Fig.3,
• As temperature increases from 25 to 35 C at 55% constant humidity, Bakelite resistance
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