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Removing   Cement   from   Lens   Elements.
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Decoating Optical Components (cont) - TM-9-254_288
TM 9-254 9-8. Decoating Optical Components. WARNING o     Sulfuric and boric acids are highly corrosive and react quickly on the skin and clothes.  Repair persons  should  wear  rubber  gloves,  rubber  aprons,  and  goggles.    A  safety  shower  or  other means should be provided for quick washing in case of an accident. o     The decoating process should be carried out under a ventilated hood, which will draw off any corrosive vapors. a. Procedures for Decoating. (1) Mix a solution of 5 grams boric acid crystals in 150 cubic centimeters of concentrated sulfuric acid. (2) Place lens elements in a pyrex baking dish lined with a fiberglass cloth. (3) Insure  that  the  acid  solution  and  the  lens  elements  are  both  at  room  temperature.    Carefully  pour  a sufficient amount of the acid solution into the pyrex dish to completely cover the lens elements. (4) Place a glass thermometer in the acid solution to monitor the temperature.  Position the dish on a hot plate, under a ventilation hood, and heat to a temperature between 230 and 250 degrees Fahrenheit. (5) After approximately 30 minutes, turn the hot plate off and allow the acid solution and lenses to cool. (6) When the acid solution has cooled to room temperature, use a battery acid syringe to transfer the acid from the dish into a suitable storage container.  This acid solution can be  reused  until  it  becomes  too weak to remove the coating from the elements. (7) Remove  the  lenses  individually  from  the  pyrex  dish,  wash  them  in  luke-warm  water,  and  dry  with cheesecloth. (8) After drying the lens elements, they should be checked for defects.  Should any defect be found the lens element should be marked with a wax pencil and sent to be reground or repolished. 9-9. Coating Optical Components. a. Reasons  for  Coating.    The  principle  reason  for  coating  optical  components  of  fire  control  instruments  is  to increase light transmission, resulting in better visibility of the target.  The coating will also reduce haze and ghost images caused by internal reflection in the instrument. 9-25

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