LU87742A1 - PROCESS AND COATING FOR PROTECTING BUILDINGS AGAINST FIRE, NOISE AND HEAT - Google Patents

PROCESS AND COATING FOR PROTECTING BUILDINGS AGAINST FIRE, NOISE AND HEAT Download PDF

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Publication number
LU87742A1
LU87742A1 LU87742A LU87742A LU87742A1 LU 87742 A1 LU87742 A1 LU 87742A1 LU 87742 A LU87742 A LU 87742A LU 87742 A LU87742 A LU 87742A LU 87742 A1 LU87742 A1 LU 87742A1
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LU
Luxembourg
Prior art keywords
coating
silicate
organic
fibers
cement
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Application number
LU87742A
Other languages
French (fr)
Inventor
Daussan Jean-Charles
Daussan Gerard
Daussan Andre
Original Assignee
Daussan Et Compagnie Societe E
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 Daussan Et Compagnie Societe E filed Critical Daussan Et Compagnie Societe E
Priority to LU87742A priority Critical patent/LU87742A1/en
Priority to PCT/FR1991/000447 priority patent/WO1991018848A1/en
Publication of LU87742A1 publication Critical patent/LU87742A1/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/49Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
    • C04B41/4905Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
    • C04B41/4922Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon applied to the substrate as monomers, i.e. as organosilanes RnSiX4-n, e.g. alkyltrialkoxysilane, dialkyldialkoxysilane
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/49Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
    • C04B41/4905Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
    • C04B41/495Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon applied to the substrate as oligomers or polymers
    • C04B41/4961Polyorganosiloxanes, i.e. polymers with a Si-O-Si-O-chain; "silicones"
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/10Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
    • C04B2111/12Absence of mineral fibres, e.g. asbestos
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/52Sound-insulating materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Fireproofing Substances (AREA)
  • Paints Or Removers (AREA)

Description

Mémoire Descriptif déposé à l'appui d'une demande deBrief Description filed in support of a request for

BREVET D'INVENTION auPATENT OF INVENTION at

Luxembourg formée par: DAUSSAN ET COMPAGNIE (Société en nom collectif)Luxembourg formed by: DAUSSAN ET COMPAGNIE (General partnership)

29-33 route de Rombas F-57140 WOIPPY/FRANCE pour: "Procédé et revêtement pour protéger les constructions contre le feu, le bruit et la chaleur"29-33 route de Rombas F-57140 WOIPPY / FRANCE for: "Process and coating to protect buildings against fire, noise and heat"

La présente invention concerne un procédé et un revêtement pour protéger les constructions spatiales, terrestres ou flottantes notamment contre le feu, le bruit et la chaleur.The present invention relates to a method and a coating for protecting space, land or floating constructions, in particular against fire, noise and heat.

Pour protéger les constructions précitées contre les effets du feu, du bruit et de la chaleur, on a déjà utilisé couramment des produits à base de diverses fibres minérales, notamment de fibres d'amiante éventuellement enrobées dans un liant organique ou inorganique. Ces produits pouvant également comporter des particules réfractaires ainsi que des fondants et/ou des charges contenant de l'eau de cristallisation ainsi que cela est décrit dans le brevet français 2458519.To protect the abovementioned constructions against the effects of fire, noise and heat, products based on various mineral fibers, in particular asbestos fibers, possibly coated in an organic or inorganic binder, have already been commonly used. These products may also include refractory particles as well as fluxes and / or fillers containing water of crystallization as described in French patent 2458519.

Toutefois, aucun des produits connus devant protéger les constructions n'offre le triple avantage de pouvoir conforter sa solidité pendant et/ou après sa mise en place, de pouvoir si nécessaire provoquer la modification de sa texture et d'augmenter de manière notable sa classification de résistance au feu.However, none of the known products which have to protect constructions offers the triple advantage of being able to reinforce its solidity during and / or after its installation, of being able if necessary to cause the modification of its texture and to significantly increase its classification. fire resistance.

Le but de la présente invention est de remédier aux inconvénients des revêtements de protection des constructions permettant d'obtenir un revêtement particulièrement résistant au feu, qui a un bon coefficient d'isolation phonique, thermique et acoustique et qui offre une grande résistance aux dégradations auxquelles sont habituellement soumis ces types de revêtement.The object of the present invention is to remedy the drawbacks of protective coatings for constructions, making it possible to obtain a coating which is particularly fire-resistant, which has a good coefficient of sound, thermal and acoustic insulation and which offers great resistance to damage to which are usually subject these types of coating.

De plus, cette invention offre la possibilité d'assainir lesdits revêtements en modifiant notamment leur structure fibreuse par l'attaque d'un produit basique approprié; cette attaque se traduit par une modification de la forme géométrique des fibres pouvant aller jusqu'à les transformer en poudre.In addition, this invention offers the possibility of sanitizing said coatings, in particular by modifying their fibrous structure by attacking an appropriate basic product; this attack results in a modification of the geometric shape of the fibers which can go so far as to transform them into powder.

Le revêtement, pour protéger les constructions, comprend des particules plus ou moins réfractaires fibreuses et/ou en grains enrobées d'un liant organique et/ou inorganique selon le degré de résistance au feu, selon le coefficient d'isolation thermique, acoustique et phonique désiré.The coating, to protect the constructions, includes more or less refractory fibrous and / or granular particles coated with an organic and / or inorganic binder according to the degree of fire resistance, according to the coefficient of thermal, acoustic and sound insulation longed for.

Nous allons expliquer l'objet de l'invention par les exemples suivants:We will explain the object of the invention by the following examples:

Lorsqu'un revêtement existant comporte déjà un composé chimique présentant la propriété d'augmenter son nombre de molécules d'eau de constitution, et que l'on le sature par pulvérisation avec l'une des formulations aqueuses suivantes, objet de l'invention, on obtient un surplus en eau de cristallisation de l'ensemble et une augmentation notable du degré de dureté dans la masse dudit revêtement.When an existing coating already comprises a chemical compound having the property of increasing its number of water molecules of constitution, and when it is saturated by spraying with one of the following aqueous formulations, object of the invention, there is obtained a surplus of water of crystallization of the assembly and a notable increase in the degree of hardness in the mass of said coating.

En effet, le silanol (CH3) SiOH additionné de silicate de soude, Si03Na2 et, suivant les nécessités de vitesse de prise, d'acide phosphorique, H3P04 jouant le rôle de catalyseur, le silanol se condense et se transforme en siloxane (CH3)2SiO + (11%) H2O. On a de ce fait également augmenté la tenue au feu du revêtement ci-dessus décrit.Indeed, the silanol (CH3) SiOH added with sodium silicate, Si03Na2 and, according to the needs of setting speed, phosphoric acid, H3P04 playing the role of catalyst, the silanol condenses and transforms into siloxane (CH3) 2SiO + (11%) H2O. This has also increased the fire resistance of the coating described above.

La vitesse de condensation est également rapide dans le cas où l'on mélange du diméthyl-silicans-diol et du silicate de soude Si03Na2 de module approprié, ou à l'aide d'un gel de silice. La combinaison de ces deux molécules donne 1/2 Na20-CH3-Si0^^5 1/2 H20. La combinaison de ces deux molécules a pour résultat qu'elles gélifient très rapidement en présence d'acide fort, par exemple, de l'acide phosphorique ou d'un acide carboxylé mélangé à de l'alcool en donnant une bonne stabilisation de la laine.The speed of condensation is also rapid in the case where dimethyl-silicans-diol and sodium silicate Si03Na2 of appropriate module are mixed, or using a silica gel. The combination of these two molecules gives 1/2 Na20-CH3-Si0 ^^ 5 1/2 H20. The combination of these two molecules results in that they gel very quickly in the presence of strong acid, for example, phosphoric acid or a carboxylated acid mixed with alcohol, giving good stabilization of the wool. .

Avec le disilane ou le silane (CH3)2SiO additionné de soude caustique NaOH dont la combinaison des deux molécules donne Na(CH3)^SiOH^O, on constate que la soude caustique à elle seule apporte 22% d'eau de cristallisation et que l'ensemble donne une très bonne cohésion au revêtement qui suivant la dose de soude caustique fera disparaître les fibres.With the disilane or the silane (CH3) 2SiO added with caustic soda NaOH whose combination of the two molecules gives Na (CH3) ^ SiOH ^ O, one notes that the caustic soda alone brings 22% of water of crystallization and that the whole gives a very good cohesion to the coating which, depending on the dose of caustic soda, will make the fibers disappear.

Selon des versions avantageuses du revêtement conforme à 1'invention, qu'il soit sous forme de panneaux rigides, ou de panneaux souples, ou de matelas fibreux, ou de projections fibreuses et/ou granuleuses, il est constitué quant aux produits laineux: de laine de roche, et/ou de cellulose et/ou de laine de verre, et/ou d'amiante, et/ou de fibres céramiques. Quant aux matières granuleuses ou en poudre, le revêtement peut comporter de la perlite et/ou de la vermiculite et/ou de la silice et/ou de la magnésie et/ou de la fillite et/ou de l'alumine et/ou de la diatomée et/ou de la pierre ponce.According to advantageous versions of the coating according to the invention, whether in the form of rigid panels, or flexible panels, or fibrous mat, or fibrous and / or granular projections, it is made up of woolly products: rock wool, and / or cellulose and / or glass wool, and / or asbestos, and / or ceramic fibers. As for the granular or powdered materials, the coating may comprise perlite and / or vermiculite and / or silica and / or magnesia and / or fillite and / or alumina and / or diatom and / or pumice.

La charge contenant de l'eau de cristallisation peut comporter: un trihydrate de carbonate de magnésium, un hexahydrate nitrate de magnésium, un dodécahydrate sulfate aluminium potassium, un dodécahydrate aluminium sodium sulfate, un silicate de sodium pentahydrate, un sulfate aluminium octa décahydrate, un sulfate de magnésium heptahydrate, un tétraborate de sodium décahydrate ou borax, un phosphate trisodique ou un trisilicate de soude ou leurs mélanges.The feed containing water of crystallization can comprise: a magnesium carbonate trihydrate, a magnesium nitrate hexahydrate, an aluminum potassium sulphate dodecahydrate, an aluminum sodium sulphate dodecahydrate, a sodium silicate pentahydrate, an aluminum octa decahydrate sulfate, a magnesium sulfate heptahydrate, a sodium tetraborate decahydrate or borax, a trisodium phosphate or a sodium trisilicate or their mixtures.

La formulation aqueuse devant assainir, modifier, surhydrater ou stabiliser le revêtement comporte du silanol, du silicone, du silane, du diméthyl-silicane-diol, du silicate de méthyle, du disilane ou leurs mélanges.The aqueous formulation intended to sanitize, modify, overhydrate or stabilize the coating comprises silanol, silicone, silane, dimethyl-silicane-diol, methyl silicate, disilane or their mixtures.

Le catalyseur, ou accélérateur de prise est un acide fort tel qu'un acide phosphorique et/ou un acide carboxylé mélangé à l'alcool.The catalyst, or setting accelerator, is a strong acid such as a phosphoric acid and / or a carboxylated acid mixed with alcohol.

Le procédé conforme à l'invention consiste à incorporer la formulation aqueuse, faisant partie de l'objet de l'invention/ au moment de la fabrication du revêtement devant donner naissance soit à un matelas fibreux, ou à des panneaux rigides ou souples ou à un revêtement projeté soit encore à saturer par pulvérisation un revêtement déjà existant.The process according to the invention consists in incorporating the aqueous formulation, forming part of the subject of the invention / at the time of the manufacture of the coating which is to give rise either to a fibrous mattress, or to rigid or flexible panels or to a sprayed coating is still to saturate by spraying an existing coating.

Une variante du procédé conforme à l'invention consiste à insuffler au travers du revêtement du gaz carbonique afin d'obtenir une gélification transformant le silicate contenu dans la formulation aqueuse en carbonate et le silicate en gel de silice.A variant of the process according to the invention consists in blowing carbon dioxide through the coating in order to obtain a gelation transforming the silicate contained in the aqueous formulation into carbonate and the silicate into silica gel.

Claims (4)

1. Procédé pour réaliser un revêtement destiné à protéger des constructions contre le feu et/ou le bruit et/ou la chaleur a l'aide de matelas et/ou de panneaux rigides et/ou de panneaux souples et/ou de projection de matières fibreuses (par exemple laine de roche, de cellulose, de verre, amiante, fibres céramiques) et/ou granuleuses comprenant des particules inorganiques plus ou moins réfractaires (par exemple perlite et/ou vermiculite et/ou silice et/ou magnésie et/ou fillite et/ou alumine et/ou diatomées et/ou pierre ponce), et/ou d'une masse de remplissage (charge) contenant de l'eau de cristallisation qui se perd au chauffage, et/ou un liant hydraulique et/ou chimique et/ou organique (par exemple ciment Portland, ciment magnésien, ciment réfractaire, ciment alumineux et/ou silicate de soude, et/ou silicate de potassium, et/ou amidon, et/ou sucre, et/ou farine, et/ou résine naturelle, et/ou synthétique), caractérisé en ce qu'on sature le revêtement pendant ou après sa fabrication ou sa projection à l'aide d'une formulation aqueuse de silanol et/ou de silicone et/ou de silane et/ou d'un diméthyl-silicane-diol et/ou d'un silicate de méthyle et/ou d'un disilane de préférence additionné d'une base (par exemple un silicate de module approprié et/ou un gel silicique et/ou la soude caustique et/ou d'un carbonate de soude) et/ou d'un acide fort (par exemple de l'acide phosphorique et/ou de l'acide carboxylé mélangé à de l'alcool) provoquant la prise dudit revêtement.1. Method for producing a covering intended to protect constructions against fire and / or noise and / or heat using mattresses and / or rigid panels and / or flexible panels and / or projection of materials fibrous (for example rock wool, cellulose, glass, asbestos, ceramic fibers) and / or granular comprising more or less refractory inorganic particles (for example perlite and / or vermiculite and / or silica and / or magnesia and / or fillite and / or alumina and / or diatoms and / or pumice), and / or a filling mass (filler) containing water of crystallization which is lost on heating, and / or a hydraulic binder and / or chemical and / or organic (for example Portland cement, magnesian cement, refractory cement, aluminous cement and / or sodium silicate, and / or potassium silicate, and / or starch, and / or sugar, and / or flour, and / or natural and / or synthetic resin), characterized in that the coating is saturated during or after s its manufacture or projection using an aqueous formulation of silanol and / or silicone and / or silane and / or a dimethyl-silicane-diol and / or a methyl silicate and / or a disilane preferably added with a base (for example a silicate of appropriate module and / or a silicic gel and / or caustic soda and / or a sodium carbonate) and / or a strong acid ( for example phosphoric acid and / or carboxylated acid mixed with alcohol) causing the setting of said coating. 2. Procédé selon la revendication 1, caractérisé en ce qu'on accélère la prise du revêtement en insufflant au travers de sa masse du gaz carbonique.2. Method according to claim 1, characterized in that accelerates the setting of the coating by blowing through its mass of carbon dioxide. 3. Procédé selon les revendications 1 et 2, caractérisé en ce que l'on dose la basicité de la formulation aqueuse de manière à provoquer la diminution du diamètre des fibres du revêtement, cette diminution pouvant aller jusqu'à la fragmentation desdites fibres leur conférant une forme poudreuse.3. Method according to claims 1 and 2, characterized in that the basicity of the aqueous formulation is measured so as to cause the reduction in the diameter of the fibers of the coating, this reduction possibly going as far as the fragmentation of said fibers giving them a powdery form. 4. Dispositif selon les revendications 1 à 3, caractérisé en ce que le revêtement destiné à protéger les constructions est à base de fibres organiques et/ou minérales et/ou de particules inorganiques et/ou organiques, pouvant comporter des charges contenant de l'eau de cristallisation, ainsi que des liants organiques et/ou inorganiques, caractérisé en ce qu'il comporte au moins un liant tel que du silanol, ou du silicone, ou du silane, ou du diméthyl-silicane-diol, ou du silicate de méthyle, ou du disilane ou de leurs mélanges, additionné d'une base et pouvant comporter un acide puissant.4. Device according to claims 1 to 3, characterized in that the coating intended to protect the constructions is based on organic and / or mineral fibers and / or inorganic and / or organic particles, which can include fillers containing water of crystallization, as well as organic and / or inorganic binders, characterized in that it comprises at least one binder such as silanol, or silicone, or silane, or dimethyl-silicane-diol, or silicate of methyl, or disilane or mixtures thereof, containing a base and which may contain a strong acid.
LU87742A 1990-06-07 1990-06-07 PROCESS AND COATING FOR PROTECTING BUILDINGS AGAINST FIRE, NOISE AND HEAT LU87742A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
LU87742A LU87742A1 (en) 1990-06-07 1990-06-07 PROCESS AND COATING FOR PROTECTING BUILDINGS AGAINST FIRE, NOISE AND HEAT
PCT/FR1991/000447 WO1991018848A1 (en) 1990-06-07 1991-06-06 Method for producing a noise and/or heat protection covering, and covering thereby obtained

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU87742A LU87742A1 (en) 1990-06-07 1990-06-07 PROCESS AND COATING FOR PROTECTING BUILDINGS AGAINST FIRE, NOISE AND HEAT

Publications (1)

Publication Number Publication Date
LU87742A1 true LU87742A1 (en) 1992-01-15

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LU87742A LU87742A1 (en) 1990-06-07 1990-06-07 PROCESS AND COATING FOR PROTECTING BUILDINGS AGAINST FIRE, NOISE AND HEAT

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529092A1 (en) * 1995-08-08 1997-02-13 Bayer Ag New mixtures, a process for their preparation and their use for coatings
US6413578B1 (en) * 2000-10-12 2002-07-02 General Electric Company Method for repairing a thermal barrier coating and repaired coating formed thereby

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB682959A (en) * 1948-08-16 1952-11-19 Rhone Poulenc Sa Improvements in or relating to new asbestos-containing materials and processes of manufacturing the same
GB701668A (en) * 1950-12-23 1953-12-30 Cowles Chem Co Cementitious composition
GB786452A (en) * 1954-09-10 1957-11-20 Midland Silicones Ltd Improvements in or relating to organosilicon compounds
FR1167040A (en) * 1955-05-05 1958-11-19 Coating coating
GB870054A (en) * 1957-03-18 1961-06-07 Midland Silicones Ltd Improvements in impregnating cement-bonded asbestos board
US3615781A (en) * 1968-08-06 1971-10-26 Robert H Schneider Two-pot silicate coatings compositions
US4137367A (en) * 1975-12-03 1979-01-30 Dresser Industries, Inc. Silane coated silicate minerals and method for preparing same
GB1588963A (en) * 1976-07-28 1981-05-07 Nat Res Dev Stone treatment
FR2418211A2 (en) * 1978-02-27 1979-09-21 Vignolles Jean Spray for thermal and acoustic insulation fireproofing etc. - includes silicone-impregnated industrial wool with perlite and adhesive
JPS60127278A (en) * 1983-06-07 1985-07-06 中島 徹 Incombustible lightweight soundproofing material and manufacture
JPH01301571A (en) * 1988-02-06 1989-12-05 Noriyuki Sugawara Engineering method for preventing and suppressing asbestos scattering

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