Title :
A method to quantify the surface insulation resistance performance of conformal coatings exposed to different temperature/humidity conditions
Author_Institution :
Centre for Mater. Meas. & Technol., Nat. Phys. Lab., Teddington, UK
Abstract :
Typical conformal coatings based on different chemistries and formulated by different manufacturers are selected for a particular application on the basis of a single value for surface insulation resistance measured at a particular temperature and humidity. This information is limited in that the performance of the coating under a wider range of environmental conditions as might be encountered during the product lifetime cannot be assessed. This procedure describes a method for determining two indices that can be used to quantify the performance of conformal coatings over a range of temperatures under damp conditions
Keywords :
circuit reliability; conformal coatings; environmental degradation; humidity; insulating coatings; plastic packaging; printed circuit manufacture; printed circuit testing; surface conductivity; thermal stresses; conformal coating application; conformal coating chemistries; conformal coating manufacturers; conformal coatings; damp conditions; environmental conditions; measurement humidity; measurement temperature; performance indices; product lifetime; surface insulation resistance; surface insulation resistance performance; Circuits; Coatings; Conducting materials; Corrosion; Electrical resistance measurement; Humidity; Insulation; Manufacturing; Surface resistance; Temperature;
Conference_Titel :
Electronic Materials and Packaging, 2000. (EMAP 2000). International Symposium on
Conference_Location :
Hong Kong
Print_ISBN :
0-7803-6654-9
DOI :
10.1109/EMAP.2000.904178
