How to Select a Cold Cleaning Solvent - Techchem.netкод для вставки
howtoselect 5/5/08 12:37 PM Page 42 Best Practice How to Select a Cold Cleaning Solvent TOM COULTON There are many different products available when making a decision on a cold cleaning solvent. Carefully review all aspects of your application when selecting the most cost effective one to use. T here are many questions you need to ask when deciding on a cold cleaning solvent. Below are some important criteria to consider when selecting the best method for your application. What is the Flash Point? There is a wide range of no flash solvents and solvents that have low flash points or high flash points. The higher the flash point, the less likely the solvent will ignite. Make sure that you differentiate Fahrenheit and Celsius when comparing the data. Companies often want to have the flash point of the solvent above 140В°F, as it is easier to ship as non-hazardous waste if the solvent qualifies. What is the Toxicity? Compare the MSDS (Material Safety IF THE Data Sheet) and review the exposure levels EVAPORATION of the solvents. If you are looking at a solvent with a low exposure level, then RATE IS TOO SLOW, IT MIGHT consider the area where it will be used. An enclosed area like a fumed hood will SLOW DOWN minimize exposure. Also, consider if PRODUCTION gloves and a respirator are necessary. Passive badge testing will assist in or take too confirming the exact levels of exposure. much time to clean your part. Does the Solvent Have a Strong Odor? When you change to a new solvent, workers in the area will often complain about the odor. Make sure you test the product if it will be used in an open area. Again, a fumed hood or enclosed area can reduce the amount of odor that is noticeable. What is the Evaporation Rate? This is an important part of the process. If the evaporation rate is too slow, it might slow down production or take too much time to clean your part. A solvent supplier will usually have comparison data to review the evaporation rate of the product they are offering. Compare that rate to what you are currently using. VACUUM PUMP INLET TRAP For more information circle 25 42 | Process Cleaning Magazine May/June 2008 A high capacity vacuum inlet trap for protecting vacuum pumps used in highly corrosive deposition processes which generate large amounts of condensable byproducts is available from MV Products of No. Billerica, MA. The MV Multi-TrapВ® 16" Vacuum Inlet Trap features a knock-down stage, two stages of user-selectable filter elements, and cooling coils for removing condensable byproducts and corrosives from deposition process forelines. Designed to protect vacuum pumps used in ALD, HCD, Nitride, TEOS, TiN and other demanding processes, this trap is constructed from 304 stainless steel and is available with ISO-160 flanges. Capable of up to 2,500 in3 of solids accumulation, depending upon material, the MV Multi-Trap 16" Vacuum Inlet Trap can be customized with the following filter options: stainless steel gauze, micro-rated polypropylene, activated alumina or charcoal, SodasorbВ® and other types to remove residual solvent vapor acids and particulates. Filters offered are 4.5" and 9" tall. For more information circle 126 How Strong is the Cleaning Power? It is important to consider if the solvent you want to use will clean your parts sufficiently. You can compare the KB (kauri butanol) value as a guide on the solvency power. The higher the KB value the stronger the cleaner. Testing the product to see if it meets your needs is recommended. What is the Cost of the Solvent? Decide on how much solvent you will use per month and calculate the cost. You may find a solvent that works for you will be too costly if a large amount of solvent is needed. Again, there are ways to reduce your usage like cleaning in a An enclosed cold cleaning bath which vapor degreaser or using minimizes worker exposure and solvent a small still to reuse the dragout. Photo courtesy of Tech Chem. solvent to help you justify the cost. Also, the disposal cost of the solvent must be consideredвЂ” is it hazardous or non-hazardous, and what is the cost? How is the Product Classified from a Regulatory Standpoint? Is it a VOC (volatile organic compound) or a reportable solvent? Are there maximum amounts you can use per month or per year for your application? Review your regulatory needs for the solvent you are considering. The questions above should be considered carefully when making a decision on a cold cleaning solvent. There are so many different products available; review all aspects of your application when selecting the most cost effective solvent to use. pcm Tom Coulton is president of Tech Chem (Hilton Head, SC), a company that specializes in supplying cold cleaning and vapor degreasing solvents and technical services. Tom can be reached at (800) 771-1351 or via e-mail at email@example.com.