Provided are a gas generant composition, a preparation method, and a gas generator containing the composition. The gas generant composition includes components having the following contents, in percent by mass: 40% to 60% of guanidine nitrate, 25% to 50% of basic copper nitrate, 0% to 7% of ammonium perchlorate, 1% to 10% of a slag-forming agent, and 0.05% to 5% of a release agent/lubricant, the slag-forming agent is used as a form-retaining agent, so that the tablets can retain their form before combustion very well after combustion, thereby completely avoiding burning of an inflatable bag due to melting and splashing of the combusted tablets. Moreover, ammonium perchlorate is used as auxiliary oxidizers, thereby reducing the amount of basic cupric nitrate used and reducing molten copper residues. The gas generant composition is mainly used in a gas generator for vehicle airbag.

Provided are a gas generant composition, a preparation method, and a gas generator containing the composition. The gas generant composition includes components having the following contents, in percent by mass: 40% to 60% of guanidine nitrate, 25% to 50% of basic copper nitrate, 0% to 7% of ammonium perchlorate, 1% to 10% of a slag-forming agent, and 0.05% to 5% of a release agent/lubricant, the slag-forming agent is used as a form-retaining agent, so that the tablets can retain their form before combustion very well after combustion, thereby completely avoiding burning of an inflatable bag due to melting and splashing of the combusted tablets. Moreover, ammonium perchlorate is used as auxiliary oxidizers, thereby reducing the amount of basic cupric nitrate used and reducing molten copper residues. The gas generant composition is mainly used in a gas generator for vehicle airbag.

The invention relates to nitrogen-generating compositions for saturation fire-extinguishing and to methods for producing same. The composition comprises: 25.0-45.0% by mass of a heavy metal oxide, 12.0-18.0% by mass of a combustion modifier in the form of aluminium oxide modified with cobalt (II) nitrate (Co(NO3)2), with accelerating additives of nickel oxide and copper oxide, with an alkali metal azide making up the remainder to 100% and 0.07-2.0% by mass of a carboxylic acid ester as moistener (residue after drying) above 100%. The composition is produced by mixing aluminium oxide with cobalt nitrate and with the moistener, allowing the mixture to stand and dry out so as to produce a first mixture, separately mixing the first mixture with the heavy metal oxide and the moistener until a second mixture is produced, separately preparing a mixture of alkali metal azide powder with the moistener until a third mixture is produced and then mixing the second mixture and the third mixture simultaneously with copper oxide and nickel oxide, drying out the produced mass and forming granules.

Humidity and temperature may impact the physical properties of Basic Copper Nitrate (BCN), (Cu.sub.2(OH).sub.3(NO.sub.3), BCN) inorganic particles. The use of hydrophobic surface coatings on these inorganic particles have been found to protect and/or minimize the amount of surface degradation over a period of time.

The invention relates to a propellant element for a gas generator for use in a safety device in the form of a coated pellet (24), wherein the coated pellet (24) comprises a core (20) made of a first pyrotechnical material (46) and a coating (22) made of a second pyrotechnical material (48) and enveloping the core (20), wherein the first pyrotechnical material (48) differs from the second pyrotechnical material (48) and wherein the core (20) includes an edge portion (26) projecting in the radial direction which extends through the coating (22) up to an outer contour (28) of the coated pellet (24), wherein the edge portion (26) is formed along a circumferential direction of the coated pellet (24) and has a smaller expansion than the core (20) in the axial direction of the coated pellet (24).

The invention relates to a propellant element for a gas generator for use in a safety device in the form of a coated pellet (24), wherein the coated pellet (24) comprises a core (20) made of a first pyrotechnical material (46) and a coating (22) made of a second pyrotechnical material (48) and enveloping the core (20), wherein the first pyrotechnical material (48) differs from the second pyrotechnical material (48) and wherein the core (20) includes an edge portion (26) projecting in the radial direction which extends through the coating (22) up to an outer contour (28) of the coated pellet (24), wherein the edge portion (26) is formed along a circumferential direction of the coated pellet (24) and has a smaller expansion than the core (20) in the axial direction of the coated pellet (24).

A method of treating a subterranean formation by contacting the formation with the following: (a) an ammonium compound; (b) an oxidizing agent selected from a perchlorate or a nitrite or combinations thereof; and (c) one or more acids, at least one of which is a bisulfate salt.

The present invention relates to gas-producing materials, methods of forming gas-producing materials, and uses of gas-producing materials. The gas-producing materials comprise a comminuted foamed polymer, a nitrogen-containing fuel and an oxidiser. The gas-producing materials may be used to suppress a fire.

The present invention relates to gas-producing materials, methods of forming gas-producing materials, and uses of gas-producing materials. The gas-producing materials comprise a comminuted foamed polymer, a nitrogen-containing fuel and an oxidiser. The gas-producing materials may be used to suppress a fire.

An electrically operated propellant includes a perchlorate oxidizer and a water insoluble polymeric binder with a water solubility of less than 0.1 grams (g) per 100 grams water at 25° Celsius (° C.). The electrically operated propellant is substantially waterless with a water content of less than 10 weight % (wt. %) water based on total weight of the electrically operated propellant.