Electric match with epoxy coated fluorocarbon containing pyrotechnic composition

• US 4,152,988 A
• Filed: 09/19/1977
• Issued: 05/08/1979
• Est. Priority Date: 09/19/1977
• Status: Expired due to Term

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Helton, Claude D., Haas, Davey S.
• Primary Examiner(s): Miller, Edward A.
• Application Number:
  US05/834,218
• Time in Patent Office: 596 Days
• Field of Search: 149/193, 102/28 M
• US Class Current: 102/202.11
• CPC Class Codes: F42B 3/128 characterised by the composition of the pyrotechnic material
• CPC Class Codes: F42B 3/198 of electric initiator heads e.g., testing, machines

Abstract

A method of making an electric match having an electrical assembly of a p of lead-in wires and a bridge wire comprising dipping said electrical assembly into a pyrotechnic composition comprised of magnesium, polytetrafluoroethylene, and fluorocarbon rubber, and then drying said pyrotechnic composition to form a match head around said bridge wire. A waterproofing coating is applied to the match head by dipping into an epoxy coating composition.

Claims

1. An electric match comprising,

an electric assembly having first and second lead-in wires and a bridgewire connected across the ends of said lead-in wires,

a pyrotechnic composition covering said bridgewire comprised, by weight, of between 52 and 56 percent of atomized magnesium, between 28 and 32 percent of polytetrafluoroethylene and between 14 and 18 percent of fluorocarbon rubber, and

a waterproof coating covering said pyrotechnic composition, said waterproof coating being the reaction product of about 65 percent, by weight, of a liquid epoxy and about 35 percent, by weight, of an epoxy hardener.