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The M & T Chemicals BC925 is a two part system and is based on the following criteria. The redundant film must be removed in the correct form and above all leave the board in a condition for further processing. Once cross‐linked, the polymer is not soluble, so the removal technique is of a mechanical nature, i.e., swelling. Caustic based materials will also swell the film but often cause it to mechanically interlock between the tracks. The degree of swelling of film must also be minimised since, the larger the final film volume, the closer to the solution density it will become. It is then more likely to float around in the solution consuming chemicals and re‐adhering to the board. The M & T BC925 is formulated to break down the film into small high density particles which either settle by gravity or can be removed by a filter system, overcoming the problems previously mentioned.