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New VPG Video Demonstrates Advantages of Bulk Metal Foil® Resistors in High-Humidity Environments
MALVERN, Pa. — Nov. 19, 2013 — Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors brand (VFR) has released a new video that demonstrates the advantages of using Bulk Metal Foil® resistors in high-humidity environments. The video compares the etching process and survival times for thin film and Bulk Metal Foil nickel-chrome alloy (NiCr) resistive elements as they are tested in 100 % humidity conditions.
All resistors that are based on nickel-chrome alloy, a category that includes thin film as well as Bulk Metal Foil devices, are susceptible to electro-chemical corrosion or etching when placed in a high-humidity environment and powered with a very low wattage. However, since the nickel-chrome element of a Bulk Metal Foil resistor is hundreds of times thicker than the element in a thin film device with the same value, it will last much longer under these conditions.
To illustrate this concept in the video, a few ounces of hot water are poured into an insulated bottle to simulate a high-humidity environment. Uncoated 1206 thin film and foil resistors are powered up at 1 mW and suspended in the bottle, while being monitored for ΔR and ppm deviation from their initial value.  Uncoated resistors are used to accelerate the humidity effect.
In the test, the thin film device etched through and failed after only two minutes and 13 seconds. Even after one hour, however, the foil resistor was unaffected. As demonstrated by the test, because of the inherent robustness of the Bulk Metal Foil element, VFR resistors are capable of surviving in a high-humidity environment much longer than nichrome thin film resistors.
Further information about Vishay Foil Resistors products is available at www.vishayfoilresistors.com.
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About Vishay Precision Group
Vishay Precision Group (VPG) is an internationally recognized designer, manufacturer and marketer of: components based on its resistive foil technology; sensors; and sensor-based systems specializing in the growing markets of stress, force, weight, pressure, and current measurements. VPG is a market leader of Foil Technology Products, providing ongoing technology innovations in precision foil resistors and foil strain gages, which are the foundation of the Company’s Force Sensors Products and its Weighing and Control Systems. The product portfolio consists of a variety of well-established brand names recognized for precision and quality in the marketplace. To learn more, visit VPG at www.vishaypg.com.
About VPG Foil Resistors
VPG Foil Resistors, a part of Vishay Precision Group (VPG), produces the most precise and stable resistors available. Distinguished by the premier brands Vishay Foil Resistors, Powertron, and Alpha Electronics, the VPG Foil Resistors portfolio includes discrete resistors and resistor networks in surface mount and through-hole (fixed-lead) configurations; customized chip resistor networks; precision trimming potentiometers; and discrete chips for use in hybrid circuits. These devices are used in applications requiring a high degree of precision and stability, such as in medical testing equipment, semiconductor equipment, precision measuring instruments, aerospace, and military applications. To learn more, visit www.vishayfoilresistors.com.
Bulk Metal is a registered trademark of Vishay Precision Group, Inc.