By James J. Licari
This booklet explains the chemistry and houses of the most varieties of polymer coatings utilized in the electronics undefined. It outlines the simplest strategies for overlaying, cleansing, and floor education, in addition to for program and curing of coatings. And, it outlines executive rules and formula alterations to satisfy VOC and toxicity standards. it is the first e-book in a chain in particular addressing the most important meeting fabrics and procedures severe to the functionality and reliability of microcircuit modules.
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Additional info for Coating Materials for Electronic Applications - Polymers, Processes, Reliability, Testing
7 provides comparative coefficients of friction for some coatings and other materials. These values should be used only as a guide since values vary depending on many factors including the surface cleanliness, dryness, and roughness. 7. 7 Hardness Besides abrasion and friction, the hardness of a coating is also a measure of its wear resistance. A soft coating is more susceptible to abrasion, scratching, and other mechanical abuse than a hard coating. A popular method for determining hardness is the Sward hardness test.
Moisture may seep through a coating by one or both of two mechanisms: passage through microcracks and/or pinholes or permeation through the polymer structure. Permeability or moisture vapor transmission rates (MVTR) are given in grams of water that will pass through a defined area and thickness of a coating material in a specified period of time. The conditions of humidity exposure and temperature must be specified. MVTR is expressed by the following equation: Chapter 1 - Functions and Requirements MVTR = Eq.
13. Classification of Materials by Volume Resistivities Materials Resistivities -6 Good conductors 10 to 10 0 ohm-cm Semiconductors 10 0 to 10 8 ohm-cm Good insulators 10 8 to >1012 ohm-cm Organic coatings are generally good electrical insulators and widely used in electronic equipment. Although their resistivities are high, even a small current flow can be critical in some electronic assemblies. Therefore, a knowledge of the electrical tolerances that a circuit or device must meet is important in selecting a coating.
Coating Materials for Electronic Applications - Polymers, Processes, Reliability, Testing by James J. Licari