US2472539A - Fire extinguishing powder - Google Patents
Fire extinguishing powder Download PDFInfo
- Publication number
- US2472539A US2472539A US670845A US67084546A US2472539A US 2472539 A US2472539 A US 2472539A US 670845 A US670845 A US 670845A US 67084546 A US67084546 A US 67084546A US 2472539 A US2472539 A US 2472539A
- Authority
- US
- United States
- Prior art keywords
- fire extinguishing
- sodium bicarbonate
- extinguishing powder
- silica aerogel
- particle size
- 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.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 title description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 18
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 9
- 235000017557 sodium bicarbonate Nutrition 0.000 description 9
- 239000004965 Silica aerogel Substances 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000002245 particle Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
- A62D1/0007—Solid extinguishing substances
- A62D1/0014—Powders; Granules
Definitions
- This invention relates to a fire extinguishing composition adapted to be projected upon fires, as from a so-called dry powder extinguisher.
- the common practice has been, and for obvious reasons, to use a. suitable, finely-divided powder which is both readily available and of low cost; and of the powders which have been proposed for the purpose, and with which the utility of the invention is herein specifically exemplified, the one in most common use is sodium bicarbonate.
- the present invention is predicated on the discovery that the characteristics of the sodium bicarbonate for fire-fighting purposes can be vastly improved, at relatively low cost, by the admixture of a minor proportion of silica aerogel of a particle size commensurate with that of the sodium bicarbonate.
- a fine particle size sodium bicarbonate is used, namely, capable of passing a 200 mesh screen, the silica aerogel being of about the same order of particle size.
- a fine particle size sodium bicarbonate is used, namely, capable of passing a 200 mesh screen, the silica aerogel being of about the same order of particle size.
- silica aerogel The amount of silica aerogel required to be used is not critical, but it has been found that carbonate particles over the burning surface.
- the mixture When discharged from a suitable container, as under gas pressure, which is the usual method, the mixture emerges in a uniformly dense cloud which is highly efiective for fire extinguishing purposes.
- the mixture prior to discharge, is devoid of such agglomerations as normally would be present in the sodium bicarbonate alone; and, in consequence, the particles are ejected much more uniformly, both as to velocity and range.
- the silica aerogel being slightly hy roscopic, tends to remove such surface moisture from the sodium bicarbonate as is apt to be present in varying amount, depending upon the season and other conditions.
- a fire extinguishing powder consisting essentially of a mixture of finely divided sodium blcarbonate and silica aerogel, both compounds having a particle size of about 200 mesh, the proportion of silica aerogel being about .5% to 1.5% by weight of the sodium bicarbonate.
- a fire extinguishing powder consisting essentially of sodium bicarbonate and silica aerogel, both compounds having substantially the same particle size and the proportion of silica aerogel being about .5% to 1.5% by weight of the sodium bicarbonate.
Description
Patented June 7, 1949 UNITED STATES PATENT OFFICE FIRE EXTINGUISHING POWDER No Drawing. Application May 18, 1946, Serial No. 570,845
2 Claims.
This invention relates to a fire extinguishing composition adapted to be projected upon fires, as from a so-called dry powder extinguisher. The common practice has been, and for obvious reasons, to use a. suitable, finely-divided powder which is both readily available and of low cost; and of the powders which have been proposed for the purpose, and with which the utility of the invention is herein specifically exemplified, the one in most common use is sodium bicarbonate.
The present invention is predicated on the discovery that the characteristics of the sodium bicarbonate for fire-fighting purposes can be vastly improved, at relatively low cost, by the admixture of a minor proportion of silica aerogel of a particle size commensurate with that of the sodium bicarbonate.
In the preferred application of the invention, a fine particle size sodium bicarbonate is used, namely, capable of passing a 200 mesh screen, the silica aerogel being of about the same order of particle size. Such a mixture has the advantage that it is quite stable, in the sense that it does not exhibit any substantial tendency to separate into its components when agitated, as during shipment or other normal handling. The importance of this factor in the fire-extinguisher art is self-evident.
The amount of silica aerogel required to be used is not critical, but it has been found that carbonate particles over the burning surface. When discharged from a suitable container, as under gas pressure, which is the usual method, the mixture emerges in a uniformly dense cloud which is highly efiective for fire extinguishing purposes. Apparently, this results from the fact that the mixture, prior to discharge, is devoid of such agglomerations as normally would be present in the sodium bicarbonate alone; and, in consequence, the particles are ejected much more uniformly, both as to velocity and range. Also, the silica aerogel, being slightly hy roscopic, tends to remove such surface moisture from the sodium bicarbonate as is apt to be present in varying amount, depending upon the season and other conditions.
The following is claimed:
1. A fire extinguishing powder consisting essentially of a mixture of finely divided sodium blcarbonate and silica aerogel, both compounds having a particle size of about 200 mesh, the proportion of silica aerogel being about .5% to 1.5% by weight of the sodium bicarbonate.
2. A fire extinguishing powder consisting essentially of sodium bicarbonate and silica aerogel, both compounds having substantially the same particle size and the proportion of silica aerogel being about .5% to 1.5% by weight of the sodium bicarbonate.
ROBERT C. McGLENN.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,792,826 Dugas Feb. 17, 1931 1,909,557 Van Hasselt May 16, 1933 2,188,007 Kistler Jan. 23, 1940 2,207,737 Hooft July 16, 1940 2,322,781 Hanks June 29, 1943
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US670845A US2472539A (en) | 1946-05-18 | 1946-05-18 | Fire extinguishing powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US670845A US2472539A (en) | 1946-05-18 | 1946-05-18 | Fire extinguishing powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2472539A true US2472539A (en) | 1949-06-07 |
Family
ID=24692124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US670845A Expired - Lifetime US2472539A (en) | 1946-05-18 | 1946-05-18 | Fire extinguishing powder |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2472539A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2881138A (en) * | 1954-05-21 | 1959-04-07 | Reiss Heinrich | Dry powder fire extinguishing medium |
| US2901428A (en) * | 1953-05-22 | 1959-08-25 | Chem Fab Grunan Ag | Fire extinguishing method |
| CN111111079A (en) * | 2019-12-04 | 2020-05-08 | 宁波汇永聚消防设备有限公司 | ABC dry powder extinguishing agent and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1792826A (en) * | 1927-09-19 | 1931-02-17 | Gas Fire Extinguisher Corp Du | Fire-extinguishing material |
| US1909557A (en) * | 1929-02-16 | 1933-05-16 | Chemische Ind Van Hasselt | Nitrosyl sulphuric acid in finely divided dry and stabilized condition and process for its manufacture |
| US2188007A (en) * | 1937-07-03 | 1940-01-23 | Samuel S Kistler | Inorganic aerogel compositions |
| US2207737A (en) * | 1938-07-28 | 1940-07-16 | Lucidol Corp | Nonlumping calcium sulphate containing composition |
| US2322781A (en) * | 1942-03-07 | 1943-06-29 | Halco Chemical Corp | Fire-extinguishing composition of matter |
-
1946
- 1946-05-18 US US670845A patent/US2472539A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1792826A (en) * | 1927-09-19 | 1931-02-17 | Gas Fire Extinguisher Corp Du | Fire-extinguishing material |
| US1909557A (en) * | 1929-02-16 | 1933-05-16 | Chemische Ind Van Hasselt | Nitrosyl sulphuric acid in finely divided dry and stabilized condition and process for its manufacture |
| US2188007A (en) * | 1937-07-03 | 1940-01-23 | Samuel S Kistler | Inorganic aerogel compositions |
| US2207737A (en) * | 1938-07-28 | 1940-07-16 | Lucidol Corp | Nonlumping calcium sulphate containing composition |
| US2322781A (en) * | 1942-03-07 | 1943-06-29 | Halco Chemical Corp | Fire-extinguishing composition of matter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2901428A (en) * | 1953-05-22 | 1959-08-25 | Chem Fab Grunan Ag | Fire extinguishing method |
| US2881138A (en) * | 1954-05-21 | 1959-04-07 | Reiss Heinrich | Dry powder fire extinguishing medium |
| CN111111079A (en) * | 2019-12-04 | 2020-05-08 | 宁波汇永聚消防设备有限公司 | ABC dry powder extinguishing agent and preparation method thereof |
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