This invention pertains to substantially nonaqueous persistent thixotropically gelled fire suppressant compositions whereby a carrier materials is permeated with a fireplace suppressant agent and is suspended in a thixotropically gelled fire extinguishing dispersant whereby the service material is insoluble. When the suppressant composition is dispersed from any suitable container onto an object within the vicinity of the combustion, the hearth is extinguished and reignition is prevented by the discharge of the suppressant agent permeating the service materials over a timeframe.
Several obtainable fireplace extinguishing compositions are presently capable of extinguishing a hearth, nevertheless, the problem of reignition still remains a excessive likelihood if hot spots and a gasoline supply stay present. These conditions are present in aircraft engine nacelles, on and off-road vehicles, engine and power prepare compartments, reside electrical wire installations, motors, upholstery, and so on.
The compositions of the current invention comprise both extinguishing materials to shortly extinguish a fireplace and means for suppressing additional combustion of combustible objects which can be potential fuel sources.
Many prior art compositions, significantly inside the form of aqueous forms, are claimed to have persistent qualities. Foam extinguishment includes the growth of water with air or other gases to kind a sticky, however flowable, stabilized foam. A layer of foam deposited on a burning object coats and separates the fuel from the flame entrance, minimizes contact with oxygen and provides some cooling action. Thus, the fire is smothered. Foams are usually cheap and comparatively simple to use on a big scale. Certainly certainly one of their main advantages is that they will persist for a lot of hours and prevent reignition. Nonetheless, the quantities of water needed for the foam hearth extinguishing agents are too great for portable items and so they can’t be used on electrical fires. Also, submit-hearth clear-up might be an issue.
One other kind of extinguishing materials contains vaporizing liquid extinguishers. The flame interference of those extinguishers is believed to be as a consequence of thermal decomposition of the vaporizing liquid to give low concentrations of flame inhibitors which quench the chemical reactions of the flame. Chlorinated fragments, as from carbon tetrachloride and brominated fragments (as from bromochloromethane) are effective. The rate of thermal decomposition, which must be speedy, volatility, which must be intermediate, and mode of application are vital.
Dry powder extinguishing agents have additionally discovered widespread use. Whereas it was initially thought that dry powder extinguishants functioned by decomposition to present CO2 (which would smother the fire), it has been established that this is not the case. There may be little measurable decomposition, and powders which cannot give CO2 (equivalent to NH4 H2 PO4) are efficient. KHCO3 is twice as effective as NaHCO3. These supplies seem to react by advantage of their chemical floor with the flame propagating intermediates in a flame front. Dry powder clouds are believed additionally to exert a thermal shielding between the latest flame front and the cooler fuel. The ten-40 micron coated particles typically used seem like a compromise between the necessity for lots of particles (favoring smaller particle size), the necessity to penetrate the new gases throughout the flame and be propelled to the flame entrance (favoring larger particles), and the necessity for flowability and storability with out packing (hence, the coatings). The dry powders as conventionally used are essentially very bulky and require relatively large extinguisher tanks.
The subsequent patents disclose numerous kinds of fire extinguishing compositions and are believed to symbolize the closest prior art.
The closest disclosure is believed to be British Patent No. 1,349,508 of Cottrell et al. This patent discloses a fireplace extinguishing composition throughout the type of an aqueous gel which produces an incombustible adherent protecting layer on burning materials to attenuate reignition. The composition comprises an aqueous gel made by on the very least partially neutralizing an aqueous answer of an alkali metal silicate with an natural or inorganic acid or acidic salt. oil cracking tower The acids preferred are those which, moreover having a gelling agent themselves, possess some fireplace-preventing properties, for instance phosphoric acids, boric acids and salts thereof. Although the precise chemical structure of the gels isn’t known, the gels are stable to mechanical agitation. In other words, the gels are usually not thixotropic.
The components of the patented composition initially may be inside the type of powders to be blended with and dissolved in water to type the aqueous gels. Movement additives akin to precipitated silica could also be added to the powders to prevent caking on storage or transport or to aid the move of the powder proper into a dissolution vessel or water stream. Other compounds may be added to the aqueous mixture earlier than or after gelling. The additives might modify the viscosity of the gel to make it extra suitable for spraying or to switch the surface properties of the gel to assist its circulate or conversely to increase the adhesion of the gel to the surfaces of combustible materials.
The Cottrell et al. patent additionally discloses incorporating an natural compound, which could also be as an illustration a hearth-retardant compound, into the gelling composition and allowing the volatilization of the natural compound to blow the composition to a foam. Appropriate compounds embody fluorocarbons optionally containing chlorine and/or bromine and ideally containing not greater than 3 carbon atoms. Particularly suitable compounds are disclosed as being bromochlorodifluoromethane, bromopentafluoroethane, dibromodifluoromethane, 1,2-dibromotetrafluoroethane, and bromotrifluoromethane. The addition of 1 to 5 % of excessive floor area silica to the composition containing volatile fluorocarbons is disclosed as being advantageous because the undesirable phase separation of parts on storage is minimized.
The Cottrell et al. patent neither discloses nor suggests the current invention. The current invention pertains to a thixotropically gelled fireplace extinguishing composition whereby a fireplace suppressant agent permeates a provider materials. The provider materials permeated with suppressant agent is insoluble in a fireplace extinguishing dispersant agent into which it is suspended. The entire composition of the present invention is then thixotropically gelled to offer a stable suspension which is definitely transported and dispensed. The permeated service materials adheres to objects inside the neighborhood of combustion to suppress combustion by slowly releasing the suppressant agent permeating the provider material.
Moroever, the gelled dispersant agent doesn’t itself adhere to the article. Slightly, the dispersant agent virtually instantly volatizes to disperse the permeated service material and to smother, cool and combine with the free radicals of the combustion course of to break the combustion chain, thereby extinguishing a hearth to which the composition is applied. Cottrell et al. doesn’t disclose a composition containing insoluble carrier material permeated with fire suppressant agent which is suspended in a thixotropically gelled hearth extinguishing dispersant agent.
U.S. Pat. No. Three,402,665 of Tarpley, Jr. et. al. discloses a non-pyrotechnic disseminator whereby the fabric to be disseminated could comprise finely divided powders suspended within a thixotropically gelled liquid which includes a minimal of a portion of liquefied gas. The one point out on this patent that the material has use as a fire extinguisher is an announcement that all of the gelled liquid could embody a liquefied gas, giving a composition having main utility the place the liquefied fuel has the property of augmenting the functionality of the finely divided powder, as within the case of liquefied Freon being used in a fireplace extinguisher. There isn’t a such thing as a disclosure or suggestion within the patent that a fireplace suppressant agent permeates a service material leading to a persistent hearth suppressant composition.
British Patent No. 1,236,075 of Hollows discloses a nonaqueous fire extinguishing liquid, as an illustration, bromochlorodifluoromethane, and a specific finely divided fire extinguishing powder. The powdered hearth extinguishing materials may be in the kind of a dispersion or suspension within the fireplace extinguishing liquid, these states being assisted if desired by suitable dispersing agents. A lot of of the known perhalocarbon liquid propellents could also be blended with the composition or its parts. The precise fireplace extinguishing powder is that disclosed and claimed in British Patent No. 1,168,092 of Birchall which comprises the response product between urea and bicarbonates, carbonates, sesquicarbonates and hydroxides of sodium and potassium, having an empirical molecular components of MC2 N2 H3 O3, the place M represents an atom of potassium or sodium.
German Auslegeschrift No. 1,211,493, dated Feb. 24, 1966, discloses a hearth extinguishing composition especially for hand fireplace extinguishers consisting of a mixture of solid fire extinguishing powders, especially those primarily based on carbonates, phosphates and sulfates, and liquid fluorinated (halo) paraffins, especially bromodifluoromethane and/or bromotrifluoromethane, which simultaneously act a propellants.
Australian Patent No. 227,557 of Warnock et al. discloses a dry chemical fire extinguishing composition comprising a dry chemical fireplace extinguishing powder, a powdered adsorbing agent and a gaseous expellant, a portion of the gaseous expellant being adsorbed by the adsorbing agent in an amount to keep up inner gaseous pressure inside the container at a predetermined pressure at room temperature, the overall amount of the gaseous expellant within the container being able to expelling substantially most of the dry chemical within the container. The adsorbing agent may be silica gel, activated charcoal, attapulgus clay, artificial zeolites, activated alumina, cracking catalysts of the type used in petroleum refining containing silica and various proportions of alumina, as properly because the excessive floor area porous materials disclosed in U.S. Pat. Nos. 2,866,760. The expellant fuel contains a halogenated hydrocarbon and a fuel chosen from the group consisting of carbon dioxide, nitrogen, ethane, nitrous oxide and air.
U.S. Pat. No. Three,258,423 of Tuve et al. discloses a hearth extinguishing composition known as “light water It includes potassium bicarbonate which may be silicone coated, water and specific types of perfluoro surfactants which type a stable foam when aerated with a fuel, harking back to air or difluorodichloromethane. It’s disclosed that the foam blocks the feedback of radiant vitality to a gasoline surface and prevents additional launch of flammable vapor after the flames have been suppressed, to forestall reignition of burning liquids, notably.
U.S. Pat. No. 3,267,030 of Dessart discloses a dry powder kind of fireplace extinguishing composition comprising 80-98% of a finely divided alkali metallic bicarbonate, 1-19% of talc and 1-8% of very advantageous grain silica. The alkali metallic bicarbonates may be coated with silicone oil. The composition is disclosed as possessing glorious compatability with foams and glorious mobility.
U.S. Pat. No. 3,609,074 of Rainaldi et al. discloses a flame extinguishing foam forming composition containing 5-25 weight percent of a bromine containing halogen saturated alkane of low carbon number (C1 to C6). The composition additionally contains substances standard in foaming liquid flame extinguishing compositions, akin to water, emulsifiers or foam stabilizing surfactants, propellents, antifreezing liquids, corrosion inhibitors, buffer substances, and thickening and carrying brokers. Sodium silicates or potassium silicates are disclosed as the thickening and carrying brokers.
U.S. Ceramic rasher ring Pat. No. Three,655,554 of Fink et al. discloses hearth extinguishing compositions, akin to foam forming liquids containing floor lively substances, which are enhanced by incorporating into the agent about 1-10 weight percent of finely dispersed silica. It’s most well-liked that the silica be present inside the hearth extinguishing liquids in colloidally dissolved kind. The foaming agent and/or foam stabilizer may be combined with the finely dispersed silica in dry form to amass a powder which is then added to water to kind the foam.
U.S. Pat. No. 4,042,521 of Dunn discloses a dry fireplace extinguishing composition comprising between about 50-ninety five% of an alkali metallic bicarbonate or alkaline earth steel carbonate and between about 50-5% of a steel silicate. Very small amounts of desiccants, reminiscent of magnesium stearate, talc, silica, silica gel, diatomaceous earth, calcium chloride, and many others., could also be added to the dry fire extinguishing composition to cease the tendency of the composition to cake or agglomerate when subjected to moisture over long periods of time. The composition is disclosed as being efficient in preventing flashback or reignition, significantly of Class B fires.
The composition of the present invention is neither disclosed nor advised by any of the above-recognized references and represents an enchancment in persistent fireplace extinguishing and suppressing compositions.
The current invention comprises a substantially nonaqueous persistent thixotropic fireplace suppressant composition comprising a fireplace suppressant agent, a carrier material, the suppressant agent permeating the carrier material to form a suppressant permeated carrier material, a fireplace extinguishing dispersant, the carrier material being insoluble throughout the dispersant, the permeated service material being suspended within the dispersant, and a gelling agent in an amount effective to thixotropically gel the suspension of permeated carrier materials and dispersant, the permeated service material being capable of adhering to an object throughout the neighborhood of combustion.
The invention also includes a way of persistently suppressing combustion by dispersing the hereinafter described composition in the neighborhood of a hearth, whereby the permeated carrier material adheres to an object or objects within the vicinity of the fire and releases the permeating suppressant agent over a time frame. The relatively gradual release of suppressant which permeates the provider material is effective in stopping reignition of an extinguished hearth and will also be efficient in stopping the spread of the fireplace to combustible gas sources in the vicinity of the hearth. The compositions in maintaining with the present invention are effective in persistently suppressing all classes of fires.
The definitions given for the subsequent phrases shall apply throughout this utility:
“Adhere means to hold in touch with by way of chemical adhesion, thermoplastic adhesion, magnetic adhesion, electrostatic adhesion and/or mechanical adhesion.
“Dispersant is a substance whereby a stable materials might be suspended underneath stress, and which, upon the release of the stress, as in being dispensed into the ambiance from a pressurized container, propels, expels, spreads or disseminates the suspended solid materials in all directions. “Percent as utilized to a component or ingredient of the composition means weight p.c of the part or ingredient based on the whole weight of the composition.
“Permeate means to diffuse the permeating substance throughout all of the structure of the permeated materials by the use of absorption, adsorption, coating, impregnation, penetration, saturation and/or chemical combination in such a manner that the permeating substance is able to being released from the permeated material.
“Persistent with respect to the combustion suppressant qualities of the composition implies that the ability of the composition to suppress combustion continues for a longer time-frame than with compositions containing related substances but which don’t have a carrier materials permeated with a suppressant agent.
“Substantially nonaqueous with respect to the described and claimed composition means that the composition contains substantially no free water, though some hydrated stable suppressant agents and/or service supplies could also be present in the composition.
“Suppress means to extinguish or to inhibit or to retard the expansion or improvement of combustion. Thus, a suppressant agent extinguishes a fire, prevents reignition of the extinguished fireplace and may be used to forestall combustion of newest fuel sources in the world of existing, potential or previously extinguished combustion.
The present invention is comprised of four principal components: a suppressant agent, a carrier material, a fireplace extinguishing dispersant and a gelling agent. Although a few of those elements could also be current in prior art extinguishing compositions, they’re combined according to the present invention in a synergistic method to provide a stable, persistent and effective hearth suppressing composition. It’s believed that the composition in keeping with the current invention possesses synergistic characteristics and produces a synergistic consequence when in comparison with the parts of the composition when used separately or as mixed throughout the prior art. Thus, in the present invention, the suppressant agent permeates the provider material in order that it’s slowly launched at or near the positioning of combustion.
Any suppressant agent capable of permeating a service materials to supply a persistent motion is also used within the compositions in step with the current invention. Often, liquids having boiling factors above about 40° F. are most popular due to their capacity to easily permeate a provider materials. Nonetheless, solids, solutions, suspensions, dispersions, and emulsions could even be effective suppressant brokers. Typical stable suppressant brokers embrace sodium salts, potassium salts, phosphates, carbonates, bicarbonates and the like. The suppressant could also be released by a chemical response, such as a result of the decomposition of a permeated carrier materials which melts and decomposes upon contact with a scorching floor.
The suppressant agent might include varied halogenated hydrocarbon fire suppressant agents effectively-known to these expert inside the artwork, comparable to 1,2-dibromotetrafluoroethane, having a vapor pressure of 14.7 psi absolute at 117.5° F., 1,2-difluorotetrachloroethane, having a vapor strain of 14.7 psi absolute at 200° F., bromochloromethane, having a vapor stress of 14.7 psi absolute at 152.6° F., dibromodifluoroethane, having a vapor pressure of 14.7 psi absolute at 76° F., and the like. The suppressant agent should be present in an amount of about 10 to about 60 weight % of the general composition.
The essential feature of the service materials utilized in the current composition is that it be capable of be permeated with suppressant agent in such a trend that the suppressant agent will in all probability be released from the provider material over a time frame. This localizes the suppressant agent and causes the suppressant agent to be released over a time frame.
Porous minerals, corresponding to vermiculite, perlite and clays, equivalent to kaolinite and sodium montmorillonite, are examples of efficient provider supplies which could also be readily permeated with the suppressant agent. These supplies, when permeated with suppressant agent, significantly gelled suppressant agent, are capable of adhering to objects.
Hydrated provider materials, such as a result of the clays described hereinbefore, Glauber’s salt (Na2 SO4.10OH2 O), sodium phosphate dodecahydrate (Na2 PO4.12H2 O), and the like are already suppressant agent permeated service supplies. The chemically mixed water is perhaps released when the hydrated service material is dispersed within the neighborhood of a fireplace.
Porous polymeric resin supplies, significantly of the foamed sort, reminiscent of “STYROFOAM polystyrene from Dow Chemical Firm, are additionally efficient carrier supplies in a position to being permeated with suppressant agent. Other sorts of polymeric resins which can be suitable to be used as carrier materials embrace polyethylene, polyurethane, polyvinylidene fluoride, silicone polymers, comparable to methyl vinyl polysiloxane obtainable from Normal Electric Firm, and the like. These porous polymeric resins adhere to the floor of an object by forming a melted adhesive coating on the new surface of the article.
Where sure polymers, comparable to polyurethane, are flammable, appropriate fireplace retardant additives may be added. Appropriate fireplace retardant additives to the provider materials embrace decabromodiphenyl oxide and tetrabromophthalic anhydride, for example. Additionally, hearth retardant materials, corresponding to “Phosgard C-22-R a chlorinated phosphorous polymer accessible from Monsanto Industrial Chemicals Company and “ABS Kynar a hearth retardant polyvinylidene fluoride obtainable from Pennwalt Company, is also used as the carrier materials.
One other kind of carrier materials adheres to combustible objects, reminiscent of textiles, by bodily entanglement. Such a carrier material includes the small hook members made from nylon bought beneath the trademark “VELCRO by Velcro Inc., and naturally occurring burrs, such because the seed pod of the cocklebur plant. The small hooks and barbs may be permeated with suppressant agent. The “VELCRO hooks will not absorb the suppressant agent, however are sufficiently small and close collectively in order that the suppressant agent, and particularly gelled suppressant agent, will cling to and coat them. That’s inside the definition of “permeate The small hooks and barbs will then adhere to a combustible textile by changing into entangled all through the textile fibers.
One other efficient service material to be used inside the composition in maintaining with the current invention includes magnetic materials, much like magnetite or perforated hollow magnetic beads. The suppressant agent can permeate the pores of the naturally occurring magnetite or be contained inside the hollow magnetic bead. Such a provider material magnetically adheres to a magnetic object within the neighborhood of the hearth, just like engine compartment partitions of autos.
A very efficient persistent hearth suppressant composition results when the provider material permeated with the suppressant agent is a minimal of partially coated with a thermoplastic polymeric resin, akin to polyvinylidene fluoride, “ABS Kynar silicone polymer, and so on. The permeated carrier materials adheres to a hot surface within the neighborhood of the combustion by means of the melted adhesive characteristics of the polymeric coating. The coating could also be applied earlier than or after the suppressant agent permeates the provider material. This provides for a suppressing motion which persists over an extended period of time.
The service materials ideally has a size where the frequent most dimension of the provider material is about 0.02-0.25 inch. Provider supplies on this measurement vary is also readily and stably suspended in a thixotropically gelled dispersant, are able to being projected nice distances and have suitable settling occasions to adequately coat objects in the vicinity of the combustion. Service materials having a median maximum dimension between about 0.02 and 0.05 inch are significantly most well-liked. The carrier material have to be present in an quantity of about 3 to about forty weight % of your entire composition.
The dispersant used to propel the suppressant impregnated provider materials to the neighborhood of the hearth ought to be nonflammable, should have hearth extinguishing capabilities and can have a vapor strain greater than 14.7 psi absolute at ambient situations. The dispersant is preferably a liquefied gas which could be thixotropically gelled. Hearth extinguishing dispersants which may be thixotropically gelled include bromotrifluoromethane, perfluorocyclobutane, bromochlorodifluoromethane, fluorotrichloromethane and dichlorodifluoromethane, for instance. The fireplace extinguishing dispersant must be present in an quantity of about 10 to about 60 weight % of the whole composition.
The other important component of the compositions in holding with the present invention is a gelling agent in an quantity effective to thixotropically gel the suspension of permeated service material and dispersant. Usually, about 0.5 to about 5% of the composition must be gelling agent. Suitable gelling brokers include, as an example, pyrogenic silica derived from the combustion of silicon tetrachloride, equal to that commercially obtainable underneath the trademark “Cab-O-Sil from Cabot Corp., organo modified montmorillonite clay (a tetraalkyl ammonium smectite) of the kind obtainable from N.L. Industries, Inc. below the trademark “BENTONE 38 oleophilic vinyl addition polymer (evenly cross-linked) of a kind out there from Dow Chemical Firm underneath the trademark “XVS00100.000 and different submicron salts nicely-recognized to those skilled within the artwork.
The gelling agent is used to make the composition in response to the present invention thixotropic, whereby the composition acts as a liquid when subjected to mechanical stress, as would happen during filling and dispensing from containers, and returns to the gel form when at rest, as when the composition is being stored. The thixotropic fire suppressant composition ought to have a yield stress sufficiently high to stop settling, compacting and agglomeration of the permeated provider materials and any additives, yet be sufficiently low to provide for ready liquefication of the gel throughout transportation and dispensing. A suitable yield stress may very well be between about 20 and 500 dynes/cm2, a yield stress of 200 dynes/cm2 being particularly preferred.
If desired, a gelling agent may be added to the suppressant agent in an amount effective to thixotropically gel the suppressant agent earlier than and after it permeates the provider materials. This is especially desirable when the provider materials is of a type which doesn’t have a big surface space to retain a substantial amount of un-gelled suppressant agent. It is contemplated that a thixotropically gelled suppressant agent may be best suited for use with provider supplies comprising hollow, perforated beads, the small hook members and the burrs.
Extra fire extinguishing additives may be incorporated into the thixotropically gelled composition. These provide the fire extinguishing dispersant with further potential to right away extinguish fires, after which the persistent permeated service material acts to suppress reignition of the fire. These brokers might embody the well-known powdered alkali metallic carbonates and bicarbonates, similar to sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate, antimony oxide, ammonium phosphate, tetramethylthiuram disulfide, and the like. These additives are retained as a stable suspension throughout the thixotropic gel.
Evaporation tests of Freon 114B2 permeated in vermiculite compared to an equivalent quantity of Freon 114B2 by itself confirmed that the permeated suppressant agent evaporated in about fifteen minutes in comparison with about three minutes for the suppressant agent by itself. Thus, it’s believed that the suppressant action will persist about 5 times longer with the permeated suppressant agent. Compositions in preserving with the present invention wherein the suppressant permeated provider material is coated with a polymeric resin are believed to have the ability to for much longer persistency. The time of effective suppression depends upon the amount of the composition utilized to a hearth, the kind of hearth, the form of surfaces to which the permeated provider material adheres, the temperature in the realm and different variable factors. The compositions based on the present invention may be used preventively by dispersing the compositions in the trail of an oncoming hearth along with their use to extinguish a fireplace and to suppress its reignition.
The compositions in line with the present invention may be stored and dispensed from any appropriate container able to withstanding the pressures generated by the gelled liquefied fuel dispersant. Such containers are properly-known to these skilled within the art, and embrace, for instance, those of the sort disclosed in U.S. Pat. No. Three,402,665 of Tarpley, Jr. et al.
The present invention will now be described in additional element with reference to the next particular, non-limiting examples. To assist in understanding the examples, the ingredients are listed in two teams. The first group, labeled “Persistent Material includes the suppressant agent, the service materials to be permeated by the suppressant agent and, where relevant, the gelling agent for the suppressant agent. The second group, labeled “Extinguishing Dispersant includes the fire extinguishing dispersant, the gelling agent for the dispersant and additives, if any.
The foam particles are positioned in excess suppressant agent, 1,2-dibromotetrafluoroethane, and the mixture is stirred. The chopped foam particles are maintained involved with the suppressant agent with stirring until the suppressant agent permeates the particles. This is also decided by weighing the particles after mixing them within the suppressant agent for varied intervals of time. When the burden of the particles after draining the excess suppressant agent is fixed, the suppressant agent is taken into account to have fully permeated the provider materials.
The gelling agent, colloidal silica, is added to the hearth extinguishing dispersant, bromotrifluoromethane, in a vessel within a pressure chamber. The drained permeated provider material is then totally combined in with the gelled dispersant. The thixotropically gelled composition is then positioned inside a dispensing container throughout the pressure chamber and sealed earlier than being removed from the chamber.
Instance 2 illustrates a composition in response to the current invention whereby a hearth extinguishing powder, KHCO3, will be suspended throughout the gelled dispersant. Otherwise, the strategy is the same as Example 1.
The technique of constructing the compositions illustrated in Examples 3-5 is principally the similar as the tactic of Instance 1.
The composition illustrated by Instance 6 is prepared in a vogue just like the preparation of the compositions illustrated within the previous examples, except that before the dibromodifluoromethane permeates the vermiculite, the vermiculite is partially coated with the polyvinylidene fluoride. The vermiculite particles are partially coated by contacting a petroleum jelly in hair portion of the surface of the particles with molten resin. The partially coated permeated material is then suspended within the thixotropically gelled dispersant as before.
Examples 7-10 illustrate the utilization of a gelled suppressant agent which permeates the service material, in Example 7 a naturally occurring seed pod