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Determining the Dynamic Oxygen Index of Insulated Fine Wire

IP.com Disclosure Number: IPCOM000088000D
Original Publication Date: 1977-Apr-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Angelo, RW: AUTHOR [+4]

Abstract

It is important to be able to measure the flammability of material, such as wire coatings, to determine the safety aspect of its use. However, this problem is often quite difficult especially with insulated fine wire because of variations in geometry, surface-to-mass ratio, temperature, air velocity and other factors which make quantitative measures difficult. A recent method which does measure the flammability of pure materials is known as the limiting oxygen index method. It is useful to measure the oxygen index of fine insulation films, but has not been totally usable to measure coated wire.

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Determining the Dynamic Oxygen Index of Insulated Fine Wire

It is important to be able to measure the flammability of material, such as wire coatings, to determine the safety aspect of its use. However, this problem is often quite difficult especially with insulated fine wire because of variations in geometry, surface-to-mass ratio, temperature, air velocity and other factors which make quantitative measures difficult. A recent method which does measure the flammability of pure materials is known as the limiting oxygen index method. It is useful to measure the oxygen index of fine insulation films, but has not been totally usable to measure coated wire.

These limitations have been overcome through the use of a method and apparatus which determine the dynamic oxygen index of an insulation coated on a fine wire. The apparatus, as shown, includes an aluminum adapter 11 used to raise a glass tube 13 and to provide an exit for the coated wire 15. Wire is fed from a feed spool 17 down through the glass tube, and the wire throughput is controlled by a motor with an indicator 19 on the motor measuring the rate of speed of the wire through the machine. The oxygen and nitrogen inputs are metered, mixed and fed into the combustion chamber.

The oxygen and nitrogen meters are set to supply a given percentage of oxygen and a given total throughput. The coated wire is then ignited toward the top of the combustion chamber and the speed of the take-up spool is adjusted to maintai...