DESCRIPTION

               CGS-206 is a new generation, highly effective antitarnish composition for silver, silver plated,
               articles. CGS-206 is based on an aqueous, heavy metal-free and  applied by simple immersion
               process.  Active  ingredients  of  CGS-206 get  transparent  chemically  covalent  bond on  the
               precious metal surface, thereby the active sites are protected. This physiochemical interaction
               in turn imparts a resistance property for sulfur or ozone corrosives.

               The  Self  Assembled  Monolayer(SAM) film  is  non  poisonous  and  can  safely  be  applied  to
               jewelry, ornaments, all types of flatware and holloware etc. This film hardly has any impact on
               electrical contact resistance, solderability,  moreover gives lubricating effect hence suitable for
               electrical connectors.

               The salient features of CGS-206 are :
                        1) Heavy metal-free
                        2) Solvent free
                        3) Chemically stable film
                        4) Easy to operate
                        5) Non hazardous
                        6) No effect on electrical conductivity
                        7) Decorative and electronics

               OPERATING   CONDITIONS

               Concentration : 100 ml/l (range: 10-200 ml/l) CGS-206.
               Operation  temperature : 55°C (45-57°C). Operating temperature should strictly not exceed
               60°C,  otherwise bath  components  will  be  destroyed.  You  will  see a  too  high  temperature
               because the solution becomes cloudy and opaque at temperatures above 60°C.
               pH-value : Keep below 4.0 with Sulfuric acid is effective.
               Agitation : Slow agitation by means of a pump and agitation of the parts is recommended.
               Filtration : Not recommended, active compound might absorb on the filter.
               Time of exposure : Rack/Barrel : 120 s (30-240 s) | Reel-to-reel : 10s (5-20s)                                          

               EQUIPMENT   REQUIRED

               Tanks : Constructed  of  stainless  steel,  polypropylene,  PVC,  PVDC,  PP or HDPE.
               Fume Extraction : Recommended.
               Heaters : Preferable  PTFE.  Heaters  must  be  fitted  with  low  solution  level  cut  outs
               and an  earth  leakage circuit breaker.
               Agitation : Preferably by agitator.

               INITIAL  MAKE-UP  OF  THE  SOLUTION

                 1.  Ensure that the tank is thoroughly cleaned before installing CGS-206.
                 2.  Fill the tank approximately 75% with distilled or deionized water.
                 3.  Heat the solution to the correct operating temperature.
                 4.  Slowly add the required volume of CGS-206 concentrate and mix thoroughly.
                 5.  Adjust to the final bath volume with distilled or deionized water.
                 6.  Ensure that the temperature is within the correct operating range.
                 7.  The bath is now ready to use.

               NOTE

               Before using CGS-206 it is recommended to melt  thoroughly  and  stir the concentrate well. Do not
               freeze. This can easily  be compensated by placing the container of CGS-206 under warm
               (50ºC) water till it is homogeneous. CGS-206 will become a clear yellow/orange liquid which,
               after stirring/shaking can be handled easily

              SOLUTION  CONTROL  AND  REPLENISHMENT

               On cooling or after a period of non use working solution may exhibit phase separation.
               This will disperse again after heating the solution to the required operating temperature.
               Evaporation losses should be compensated for by addition of distilled or deionized water.
               The CGS-206 concentrate   must   be   maintained at 100%.The effective inhibitor content
               can  be determined using the method described in APPENDIX  “1.  ANALYSIS  METHODS  for
               ANTITARNISH CGS-202”.

               APPENDIX

               Analysis Methods for CGS-206
                 1. The inhibitor concentration can be determined using the following method of analysis:
                    Equipment : 250ml Erlenmeyer flask, Volumetric pipette, 25ml burette
                    Chemicals : 30% Sulfuric acid, 0.1 N iodine solution, 0.1 N-sodium thiosulfate solution PI-
                    5 (ask for this product at NCT)
                    Method : Pipet 50ml of the warm, homogeneous process solution into a 250ml
                    Erlenmeyer flask mixed with about 10ml PI-5 and add about 5ml sulfuric acid(30%).
                    Dilute this solution with 50ml deionized water. Add 10ml 0.1 N iodine solution and shake
                    thoroughly before the sample stands at a dark place for about 15 minutes. Titrate the
                    resultant red-brown solution with 0.1 N-sodium thiosulfate solution until the red-brown
                    color changes to the white color of the original solution.
                    Calculation : Concentration of CGS-206 (ml/l) = (10– consumption of 0.1 N-Na2S2O3)x6

                 2. Method for testing the oxidation protection of an electroplated precious metal layer:
                    Chemicals : 2% aqueous solution of potassium polysulfides(20g potassium polysulfides
                    42-45% solved in 1.0 l deionized water.) A fresh solution should always be prepared
                    before testing. The temperature should not > 25 °C.
                    Method : The test sample and the control sample will be dipped for a few minutes in a 2%
                    aqueous solution of potassium polysulfides, after that the parts will be rinsed in running
                    water. A non-passivated part is tested as a reference at the same time.
                    Interpretation : Perfectly passivated parts should not show any dark color changes
                    (spots). The control sample is used for checking the usability of the testing solution.
                    NOTE : Duplicate the titration as the method is critical

               WASTE  TREATMENT

               The working solution of CGS-206 is no hazardous substance. The active ingredients can be
               absorbed by  active  carbon  and  burnt  with  it.  We  recommend to  stir  the  spent  antitarnish
               solution with active carbon for some hours at room temperature and to filter it afterwards. Due
               to drag-in sometimes silver and cyanide accumulate in the antitarnish solution. In these cases
               a treatment  for  the  oxidation  of  cyanide  and  the  precipitation of  the  heavy  metals  will  be
               required.  The  spent solution  treated  in  this  way  may  be  discharged  into  the site’s  sewage
               system. The instructions of the local water/sewage authorities must be observed in any case.

               HANDLING  AND  SAFETY  INSTRUCTIONS

               For detailed information consult the material safety data sheets for this product. Please read
               material safety data sheets carefully before using this product.

               ANTITARNISH CGS-206 PACKINGS

               20L PE JERRY CAN, 100L PLASTIC D/M