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The Correct working temperature for PCB chemistry

To produce a high quality PCB it is important to set the correct working temperature for each PCB chemistry as per the manufacturers recommended range.

Due to the ambient temperature of the room in which the chemistry is being used it is impossible to preset the temperatures on the Mega PCB tanks in the factory. All you require is a thermometer, either a traditional glass one or a digital meter. If you are in a school the science department are likely to have one.

So what are the correct temperatures for each of the PCB chemistry?

Ferric Chloride 5 litres

Ferric Chloride is used to etch a PCB and should be used in a heated bubble etch tank. The ideal temperature is between 35ºC and 55ºC with an optimum temperature of 45ºC.

Microtrak Developer Powder

Microtrak developer in powder or liquid concentrate form should be used in a heated tank between 18-24ºC.

Resist Stripper

Microtrak Resist stripper should be used in a heated tank between 45 – 50ºC

Tin powder

Tin powder should be dissolved at 50ºC and then allowed to cool down to room temperature before using. If using a heated tank set the temperature control to 20ºC so that the heater turns off once temperature is reached.

Using the chemistry at incorrect temperatures may result in damaged to the board rendering it useless or it taking forever to work. Remember if using the same thermometer in each of the chemistry, do ensure that you rinse the thermometer with water once it is removed before placing it in a different chemistry. You do not want to contaminate one chemistry with another.

For information on all our PCB chemistry, safety data sheets and pricing visit our website at https://www.electronelec.co.uk/store/PCB-Equipment/PCB-chemicals