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Solvent Alternatives Guide
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A chemical designed to react with organic fatty acids, such as rosin, some oils and greases, to form a water-soluble soap. This is a solvent-free method of defluxing and degreasing many parts. Saponifiers are usually alkaline and may be mineral (based on sodium hydroxide or potassium hydroxide) or organic (based on water solutions of monoethanolamine).  
The breaking down of oils into very fine droplets called colloids; to hydrolyze a fat with alkali to form a soap and glycerol.  
Surface mount component.  
Surface mount device.  
Significant New Alternatives Policy. Section 612 of the Clean Air Act Amendments of 1990 requires EPA to publish lists of acceptable and unacceptable alternatives for ozone depleting substances (ODSs). These lists are available from: SNAP Coordinator U.S. EPA 6205J 401 M St. SW Washington, DC 20460 (202) 233-9195  
Although not a strictly correct definition, in this context a product (aqueous or organic) designed to clean a component or assembly by dissolving the contaminants present on its surface.  
Solvent containment
Means of preventing or reducing the emission of CFC or other solvents into the environment. This technique usually involves improving the design of the equipment in which the solvent is used and preventing losses.  
Surface mount technology (SMT)
A technique of assembling SMDs or SMCs on the surface of PCBs and PWAs, as opposed to wiring them through holes. Surface mount technology offers a number of important advantages, but also some disadvantages, such as difficulty in defluxing under certain types of SMD.  
Surface mount component (device)
A component (device) capable of being attached to a PCB by surface mount technology. The device may be either leaded or leadless.  
A product designed to reduce the surface tension of water. Also referred to as tensio-active agents/tensides. Detergents are made up principally from surfactants.  
Superfund Amendments and Reauthorization Act.  

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Last Update: 09 March 1999