一.Product description : LT-609 withdrawal tin / Pb-Sn single liquid-liquid, no peroxide, freon-free and non-nitrate complexes of tin-lead / Pb-Sn liquid can step retired PCB copper surface layer of lead or tin, copper and tin alloy layer. Applicable to PCB (PCB) production process copper surface Sn / Pb-Sn layer retired. This applies to products for mechanical spraying operation or manual. 

二. Product characteristics : 

       1, retreat tin / faster Pb-Sn, Sn-Pb content; 

       2, retired Sn / Pb-Sn and Cu surface finish bright, no precipitation; 

       3, the copper surface corrosion, small right-resin substrate corrosion; 

       4, the non-fluoride, peroxides, smokeless, basic tasteless, green easy handling;

三.Product performance : 

        1,retreat tin Speed : Spray 10-15 seconds corner tin plating 4-6um;

        2, the corrosion rate of copper :0.3-0 .8um/min (<35 º C); 

        3, a proportion (20Be º) : 1.2 ± 0.05; 

        4, the operating temperature :15-40 º C, the best 25-35 º C, not more than 40 º C; 

        5, acidity : 5.5N ± 0.5N;

        6, solubilizing capacity 283g tin / L, more economical tin solubilizing capacity reductant sodium / L, respectively. 

四. Equipment : 

        1, the nozzle : cone nozzle; 

        2, but prospective coil : stainless steel, PTFE; 

        3, tanks, planes equipment, such as exhaust pipe components : PTFE, polypropylene, stainless steel, carbon steel, etc..

五.The method of operation :

        1,the product of single-fluid type, without adding any items can be used; 

        2, the proposed use of the old 20-30% on merger open cylinder;

        3, the control solution temperature of 20-40 ° C, the optimum temperature for 25-35 º C, if solution temperature over 40 º C, immediately opened cooling system or suspended to ensure that the appropriate operating temperature

        4, under the tin layer thickness, retired on the Pb-Sn recency, retired board of clean surface to the extent adjusted speed;

        5, more than 90 seconds board retreat is not clean and emptying the old 30-40% of the liquid, add the new solution to a normal level, the operation can be repeated;

        6, when using the five-step resolution will still be less than ideal results, or solution 50-70 1.36-1.45, the use of supplementary liquid stripping LT - 609B, generally LT-609 : LT - 609B = 4:1 operation, can it achieve the desired results;

        7, and the automatic monitoring system automatically adds the use of better 

六. Security measures : avoid the LT-609 solution and LT - 609B with the skin, eyes, clothes contacts when dealing with LT-609, should be put on protective clothing, recommended the use of rubber gloves, goggles, leather aprons and rubber boots. For safety of a shower washing eye drops should be readily available. When the solution and skin contact, immediately rinse water thoroughly, and if they eye contact, rinse with water, serious medical treatment immediately. 

七. Bath analysis methods :

   1,An analysis appliances :

       A, 1 ml of fluid transfer tube 

       B, 250 milliliter beaker
 
       C, 50 ml of Buret

       D, PH meter

       E, electromagnetic stirrer and mixing seeds

       F, 100 ml graduated cylinder

   2, analysis steps :

      A ,draw 1 ml of fluid, Add 250ml beaker; 

      B, by adding 100ml of distilled water;

      C, pH electrode inserted solution; 

      D, 0.1N sodium hydroxide solution standard titration until the solution pH to 8.0.
   3, the calculation :
 
                         Ml (NaOH) × N (NaOH)

   Acid equivalent =----- ------------

                         Sample size