Product Information Data Sheet Liquid Tin (MG Cat. No. 421) PRODUCT DESCRIPTION Liquid Tin is a clear immersion tin designed and formulated to coat a copper substrate or solder deposit with a dense tin deposit. This deposit is readily solderable with a long shelf life. The tin deposit owes its outstanding corrosion protection to its dense coating and absence of co-deposited organics. Liquid Tin will clean solder deposits and render the surface active and bright, ensuring good solderabilty. It has the benefit of: High metal concentration (4 oz./gallon) Clear solution even at room temperature Dense tin deposit, long shelf life Residues are free rinsing Very stable solution SOLUTION MAKE-UP Liquid Tin is used at full strength and therefore requires no mixing or dilution. OPERATING CONDITIONS Nominal Range Activity 100% 10 120% Temperature 27C (80F) 21 60C (70 140F) Time 5 min. 110 min. Deposition rate 10 in/min. 3-22 in/min. Agitation constant mechanical RECOMMENDED PROCESS CYCLE Copper: 1. Clean board 2. Rinse 3. Liquid Tin 4. Warm water rinse 5. Deionized water rinse 6. Dry The treatment of solder plated parts requires no pre-cleaner, except in cases of severe contamination of the surface. In these cases, an alkaline soak cleaner, acid soak cleaner, or a proprietary solder cleaner may be used.Product Information Data Sheet Liquid Tin (MG Cat. No. 421) BATH OPERATION AND MAINTENANCE Liquid Tin may be used until the activity drops to about 1 0%. Volume lost due to evapora- tion should be replaced with D. I. water. Chemical replenishment of Liquid Tin solutions is not recommended. EQUIPMENT Liquid Tin solutions should be used with equipment constructed of polypropylene, polyeth- ylene, Teflon similar materials. Do not use stainless steel. Heaters should be Teflon or quartz. WASTE TREATMENT A spent solution should be diluted by at least 50 percent with tap water. Add 10 grams per liter ferrous sulfate and mix until totally dissolved. Then adjust pH to 8.5 with dilute sodium hydroxide. Allow the resulting precipitate to settle, and dispose of the supernatant liquid and precipitate in accordance with all applicable federal, state and local regula- tions. SAFETY Liquid Tin solutions are strongly acidic. Normal caution such as the use of safety goggles, rubber gloves, etc., should be exercised during handling. Avoid breathing vapors. In the event of eye contact, flush with copious amounts of water and CONTACT A PHYSICIAN. Consult the Material Safety Data Sheet for safety, health and environmental information. Liquid Tin can be operated until the percent activity reaches 10%.