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Title: Safe epoxy encapsulant for high voltage magnetics

This paper describes the use of Formula 456, an aliphatic amine cured epoxy for impregnating coils and high voltage transformers. Sandia has evaluated a number of MDA-free epoxy encapsulants which relied on either anhydride or other aromatic amine curing agents. The use of aliphatic amine curing agents was more recently evaluated and has resulted in the definition of Formula 456 resin. Methylene dianiline (MDA) has been used for more than 20 years as the curing agent for various epoxy formulations throughout the Department of Energy and much of industry. Sandia National Laboratories began the process of replacing MDA with other formulations because of regulations imposed by OSHA on the use of MDA. OSHA has regulated MDA because it is a suspect carcinogen. Typically the elimination of OSHA-regulated materials provides a rare opportunity to qualify new formulations in a range of demanding applications. It was important to take full advantage of that opportunity, although the associated materials qualification effort was costly. Small high voltage transformers are one of those demanding applications. The successful implementation of the new formulation for high reliability transformers will be described. The test results that demonstrate the parts are qualified for use in DOE weapon systems willmore » be presented.« less
Authors:
;
Publication Date:
OSTI Identifier:
633998
Report Number(s):
SAND--98-0217C; CONF-980324--
ON: DE98002729; BR: DP0401014; TRN: AHC2DT01%%8
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Conference: 18. Capacitor and resistor technology symposium, Huntington Beach, CA (United States), 9-12 Mar 1998; Other Information: PBD: Jan 1998
Research Org:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 24 POWER TRANSMISSION AND DISTRIBUTION; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; TRANSFORMERS; EPOXIDES; ENCAPSULATION; AMINES; MATERIAL SUBSTITUTION; WEAPONS; THERMAL CYCLING; MECHANICAL TESTS; ELECTRICAL TESTING; EXPERIMENTAL DATA