EP0372893A2 - Stromleitende Zusammensetzung für Initialladung - Google Patents

Stromleitende Zusammensetzung für Initialladung Download PDF

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Publication number
EP0372893A2
EP0372893A2 EP89312639A EP89312639A EP0372893A2 EP 0372893 A2 EP0372893 A2 EP 0372893A2 EP 89312639 A EP89312639 A EP 89312639A EP 89312639 A EP89312639 A EP 89312639A EP 0372893 A2 EP0372893 A2 EP 0372893A2
Authority
EP
European Patent Office
Prior art keywords
composition
graphite
weight
carbon black
conducting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89312639A
Other languages
English (en)
French (fr)
Other versions
EP0372893A3 (de
Inventor
John R. Bentley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commonwealth of Australia
Original Assignee
Commonwealth of Australia
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Commonwealth of Australia filed Critical Commonwealth of Australia
Publication of EP0372893A2 publication Critical patent/EP0372893A2/de
Publication of EP0372893A3 publication Critical patent/EP0372893A3/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C7/00—Non-electric detonators; Blasting caps; Primers
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B23/00—Compositions characterised by non-explosive or non-thermic constituents
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B41/00—Compositions containing a nitrated metallo-organic compound
    • C06B41/02—Compositions containing a nitrated metallo-organic compound the compound containing lead

Definitions

  • This invention relates to conducting compositions for use in primers and for use in detonators.
  • the present invention is particularly concerned with applications where power insensitivity is particularly important.
  • US-A-4605453 discloses a conducting composition for use in a firing cap, which comprises normal lead styphnate having a mean particle size not less than 55 microns in admixture with carbon black which has a mean aggregate size between 5 and about 15 microns and which has high energy insensitivity.
  • the power sensitivity however is particu­larly low.
  • Devices containing these compositions can be initiated with power of less than one watt. It is impor­tant in designing primers and detonators that they comply with a requirement of being insensitive to both one amp and one watt.
  • the present invention provides a conduct­ing composition suitable for use in a detonator, consisting of 2 to 10 percent by weight of carbon black and/or graphite, 40 to 80 percent by weight of lead styphnate, the balance being lead oxide or other explosive or non-explosive material, said composition being formulated to ensure insensitivity to one amp of current or one watt of power.
  • the conducting composition utilise normal lead styphnate which has a mean particle size not less than 5 microns in admixture with carbon black or graphite which has a mean aggregate size between 0.5 microns and 15 microns.
  • the content of carbon black is adjusted to provide resistance within the range of half to three ohms. This requirement compares with resistance levels ranging upwards from 16 ohms in US-A-4605453.
  • the voltage and current sensitiv­ities are approximately the same and this can be achieved by preferably adjusting the composition to have a nominal resistance of approximately 1 ohm.
  • composi­tions of firing times less then 50 milliseconds and preferively less than 8 milliseconds for a firing current of 5 amps are provided which still satisfy the one amp, one watt insensitivity requirement.
  • the graphite can replace all or some of the carbon black depending on the desired functioning time. Preferably at least one percent by weight of graphite is used.
  • the firing time decrease is achieved with an increase in resistance, and thus the current insensitivity may approach the threshold of one amp if the resistance is too high.
  • One preferred formulation of the present invention comprises a conducting composition having the following composition: Carbon Black (Tintacarb) 7.5% by weight Lead Oxide 30.0% by weight Lead Styphnate 62.5% by weight
  • This composition had a firing time of less than 8 milliseconds and was insensitive to one amp of current and one watt of power.
  • Example 3 Carbon Black 3.5% by weight Graphite 1% by weight Lead Styphnate 64.5% by weight Lead Oxide 31% by weight
  • This composition had a firing time of less than 8 milliseconds and was insensitive to one amp of current and one watt of power.
  • compositions of the present invention are useful in any situation where bridge wire devices are required to be replaced by a cheaper yet power-insensitive device.
  • a typical application is in relation to automobile crash bags where an electrically activated explosive charge is re­quired to initiate inflation of the protective bag and the risk of unintended initiation must be low.
  • conducting compositions can be used wherever electrically initiated detonators or igniters are used and can be formulated for a wide range of firing times and still be insensitive to one amp of current or one watt of power.
  • the present invention provides a new and useful conducting primer composition which overcomes difficulties associated with alternative initiating devices.
EP89312639A 1988-12-05 1989-12-04 Stromleitende Zusammensetzung für Initialladung Withdrawn EP0372893A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU1757/88 1988-12-05
AUPI175788 1988-12-05

Publications (2)

Publication Number Publication Date
EP0372893A2 true EP0372893A2 (de) 1990-06-13
EP0372893A3 EP0372893A3 (de) 1990-08-29

Family

ID=3772153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89312639A Withdrawn EP0372893A3 (de) 1988-12-05 1989-12-04 Stromleitende Zusammensetzung für Initialladung

Country Status (1)

Country Link
EP (1) EP0372893A3 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2356210A (en) * 1941-07-22 1944-08-22 Remington Arms Co Inc Priming composition
US3320104A (en) * 1964-02-28 1967-05-16 Dynamit Nobel Ag Method of making lead styphnate primer compositions
DE1173373B (de) * 1962-04-12 1967-09-07 Diehl Fa Verfahren zur Herstellung von Initial-sprengstoffen mit definierter elektrischer Leitfaehigkeit
US3910188A (en) * 1974-04-04 1975-10-07 Us Army One watt/one amp no-fire match type initiator
US4605453A (en) * 1985-10-01 1986-08-12 The Commonwealth Of Australia Firing cap composition containing lead styphnate
FR2599361A1 (fr) * 1986-05-27 1987-12-04 Survilliers Nle Cartoucherie Composition pyrotechnique pour inflammateur et allumeur electrique de securite, inflammateur et allumeur ainsi obtenus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2356210A (en) * 1941-07-22 1944-08-22 Remington Arms Co Inc Priming composition
DE1173373B (de) * 1962-04-12 1967-09-07 Diehl Fa Verfahren zur Herstellung von Initial-sprengstoffen mit definierter elektrischer Leitfaehigkeit
US3320104A (en) * 1964-02-28 1967-05-16 Dynamit Nobel Ag Method of making lead styphnate primer compositions
US3910188A (en) * 1974-04-04 1975-10-07 Us Army One watt/one amp no-fire match type initiator
US4605453A (en) * 1985-10-01 1986-08-12 The Commonwealth Of Australia Firing cap composition containing lead styphnate
FR2599361A1 (fr) * 1986-05-27 1987-12-04 Survilliers Nle Cartoucherie Composition pyrotechnique pour inflammateur et allumeur electrique de securite, inflammateur et allumeur ainsi obtenus

Also Published As

Publication number Publication date
EP0372893A3 (de) 1990-08-29

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