WO2014187703A1 - Produits ignifugés, à base de sulfate de calcium - Google Patents

Produits ignifugés, à base de sulfate de calcium Download PDF

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Publication number
WO2014187703A1
WO2014187703A1 PCT/EP2014/059783 EP2014059783W WO2014187703A1 WO 2014187703 A1 WO2014187703 A1 WO 2014187703A1 EP 2014059783 W EP2014059783 W EP 2014059783W WO 2014187703 A1 WO2014187703 A1 WO 2014187703A1
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WO
WIPO (PCT)
Prior art keywords
calcium sulphate
slurry
amount
based product
equal
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.)
Ceased
Application number
PCT/EP2014/059783
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English (en)
Inventor
Laura BROOKS
Joanna SPARKES
Jan Rideout
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.)
Saint Gobain Placo SAS
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Saint Gobain Placo SAS
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Filing date
Publication date
Application filed by Saint Gobain Placo SAS filed Critical Saint Gobain Placo SAS
Publication of WO2014187703A1 publication Critical patent/WO2014187703A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C04B2111/0062—Gypsum-paper board like materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • C04B2111/00672—Pointing or jointing materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures

Definitions

  • This invention relates to improved fire resistant calcium sulphate-based products and, in particular, to calcium sulphate-based building/construction products having improved strength after exposure to high temperatures.
  • Calcium sulphate-based products are widely used in the construction of buildings, for example, to form internal partitions (using wallboard, also known as dry wall, gypsum board or plaster board) and ceilings or to encase ducts (e.g. ventilation ducts) within buildings.
  • wallboard also known as dry wall, gypsum board or plaster board
  • encase ducts e.g. ventilation ducts
  • Calcium sulphate-based products such as wallboard are typically formed by drying an aqueous slurry of the hemihydrate of calcium sulphate (CaSO 4 .1 ⁇ 2H 2 0), also known as calcined gypsum or stucco, between two sheets of lining paper or fibreglass matting. As the slurry dries and the calcined gypsum is hydrated, a hard, rigid core of gypsum (calcium sulphate dihydrate - (CaSO 4 .2H 2 0)) sandwiched between the lining sheets/mats is formed.
  • shrinkage (which may be around 2% of the wallboard's length or width or around 6vol%) often causes the wallboards to pull away from their supporting structures. This is obviously undesirable. In situations where wallboard is used for internal partitions and a fire breaks out, shrinkage can leaves gaps exposing rooms adjacent to the fire source to the effects of the heat/fire. Gaps also allow ingress of oxygen into the fire source thus fuelling the fire and negating the effects of any fire doors.
  • the wallboard loses strength and, ultimately, structural integrity.
  • the gypsum core of wallboard that has been exposed to high temperatures such as those generated during building fires crumbles to a fine dust and thus the wallboard effectively disintegrates.
  • the vermiculite contained within the wallboard core expands by an amount comparable to the amount of gypsum shrinkage thus resisting the shrinkage of the wallboard.
  • the fibres which are known to be asbestos and/or glass, form a network which mechanically bind the gypsum core together and reduces the likelihood of mechanical failure.
  • Wallboard containing unexpanded vermiculite and/or glass fibres has found extensive commercial excess.
  • US3616173 proposed adding small amounts (preferably about 2-5wt%) of clay, colloidal silica or colloidal alumina to the gypsum core in addition to the glass fibres and vermiculite. The intention was to reduce the density of the fire resistant wallboard. Amounts greater than 20wt% were found to result in a weak core that did not bind satisfactorily with the paper lining sheets.
  • US2003/0138614 discloses a fire resistant gypsum wallboard containing, in addition to unexpended vermiculite and glass fibres, 3-25wt% of a mineral additive which may be a clay and 3-15wt% hydrated alumina. Best results are achieved using 10-15wt% of a clay which comprises 25% kaolinite.
  • US4664707 discloses a gypsum wall board made from a slurry containing glass fibres, calcium sulphate crystal fibres and 0.5-5wt% clay.
  • the clay is preferably a kaolinitic clay.
  • US6569541 discloses a water-resistant gypsum wallboard containing 5-15wt% of a mineral additive which may be a clay such as kaolinite.
  • a preferred aim of the present invention is to provide an improved fire/heat resistant calcium- sulphate-based product having improved strength, hardness and structural integrity after heat exposure e.g. during a building fire.
  • Such an improved fire resistant wallboard may have particular use for encasing ventilation/smoke extraction ducting.
  • the present invention provides a calcium sulphate-based product comprising gypsum and a clay additive, wherein the clay additive is provided in an amount greater than 22 wt% (based on the amount of gypsum and clay additive).
  • the present invention provides a calcium sulphate-based product comprising gypsum and a clay additive, wherein the product is formed from drying an aqueous slurry containing calcined gypsum and > 25wt% (relative to the total amount of calcined gypsum and clay additive) of said clay additive.
  • the present invention provides a method of forming a calcium sulphate- based product by drying an aqueous slurry comprising calcined gypsum and >25wt% (based on the total weight of the calcined gypsum and the clay additive) of a clay additive.
  • the present invention provides the use of a clay additive in an aqueous slurry of calcined gypsum in an amount greater than 25wt% (based on the total weight of the calcined gypsum and the clay additive) for reducing shrinkage and improving strength during heat exposure of a calcium sulphate-based product formed by drying said slurry.
  • the present invention provides the use of a clay additive in an amount greater than 22 wt% (based on the weight of clay additive and gypsum) for reducing shrinkage and improving strength during heat exposure of a calcium sulphate-based product comprising gypsum.
  • the present inventors have found that adding a clay additive in an amount greater than 25wt% (based on the total weight of the calcined gypsum and the clay additive in the slurry) results in a calcium sulphate-based product (containing greater than 22wt% clay additive) which maintains its structural integrity, strength and dimensional stability even after heating up to 1000°C. It is thought that a sintering process occurs which binds the gypsum together and helps improve the structural integrity and hardness and reduces shrinkage. Analysis of the clay structure after heating (and after the gypsum has been removed using EDTA) shows that the clay forms an interlinking network structure which helps to bind the gypsum and thus increase hardness and strength. The clay network helps delay sintering of the gypsum and thus helps reduce shrinkage.
  • the clay additive is a kaolinitic clay material.
  • kaolinitic clay material encompasses kaolinite (AI 2 Si205(OH) 4 ), polymorphs of kaolinite such as dickite, halloysite and nacrite, ball clay (which comprises 20-80% kaolinite, 10-25% mica, 6-65% quartz), fire clay and flint clay.
  • An example of a suitable clay additive is Puroflo 31TM manufactured by Sibelco and which comprises 66% kaolinite, 23% mica, 6% feldspar and 1 % quartz. The clay is preferably un-calcined.
  • the clay additive may be provided in an amount equal to or greater than 30wt%.
  • the amount of clay additive in the slurry may be equal to or greater than 35wt%.
  • the maximum amount of clay additive may be 70wt%, or, preferably, 60wt% and most preferably 50wt%. These wt% values are based on the total weight of the calcined gypsum and the clay additive in the slurry.
  • the clay additive may be provided in an amount equal to or greater than 26 wt%.
  • the amount of clay additive in the product may be equal to or greater than 31 wt%. These wt% values are based on the total weight of the gypsum and the clay additive in the product.
  • the maximum amount of clay additive may be 62 wt% or, preferably, 53 wt% and, most preferably, 44 wt%. These wt% values are based on the total weight of the gypsum and the clay additive in the product.
  • gypsum is intended to refer predominantly to calcium sulphate dihydrate (CaSO 4 .2H 2 0).
  • calcined gypsum is intended to refer predominantly to calcium sulphate hemihydrate (CaS0 4 . 1 ⁇ 2H 2 0) but may also encompass any other calcium sulphate compound having a lower bound water content than calcium sulphate dihydrate (e.g. calcium sulphate anhydrite).
  • the calcined gypsum is provided in an amount of 75wt% or less.
  • the calcined gypsum may be provided in an amount equal to or less than 70wt%.
  • the amount of calcined gypsum in the slurry may be equal to or less than 65wt%.
  • the minimum amount of calcined gypsum may be 30wt%, or, preferably, 40wt% and most preferably 50wt%. These wt% values are based on the total weight of the calcined gypsum and the clay additive in the slurry.
  • the gypsum is provided in an amount of 78 wt% or less.
  • the gypsum may be provided in an amount equal to or less than 74 wt%.
  • the amount of gypsum in the product may be equal to or less than 69 wt%.
  • the minimum amount of gypsum may be 38 wt% or, preferably, 47 wt% and, most preferably, 56 wt%. These wt% values are based on the total weight of the gypsum and the clay additive in the product.
  • calcium sulphate-based product may include building materials such as wallboards (with or without liners) (with or without fibrous reinforcement), tiles (e.g. ceiling tiles), duct encasement panels, joint filler materials (e.g. for joining adjacent wallboards/tiles/panels etc.).
  • building materials such as wallboards (with or without liners) (with or without fibrous reinforcement), tiles (e.g. ceiling tiles), duct encasement panels, joint filler materials (e.g. for joining adjacent wallboards/tiles/panels etc.).
  • the calcium sulphate-based product may be a composite product e.g. it may be a wallboard having a gypsum matrix core (containing the shrinkage resistance additive) sandwiched between two liners (e.g. paper liners or fibreglass matting).
  • a gypsum matrix core containing the shrinkage resistance additive
  • two liners e.g. paper liners or fibreglass matting
  • the calcium-sulphate-based product contains substantially no vermiculite.
  • the present inventors have found that the addition of increased amounts (>25wt% in the slurry) of a clay additive can help minimise shrinkage of a calcium-sulphate-based product e.g. gypsum wallboard even in the absence of vermiculite.
  • the calcium sulphate-based product contains substantially no inorganic fibres e.g. no glass or asbestos fibres.
  • the present inventors have found that the addition of increased amounts (>25wt% in the slurry) of a clay additive can help maintain strength and structural integrity after heating even in the absence of a fibrous network.
  • the calcium sulphate-based product may contain inorganic fibres (e.g. glass fibres) and/or matting (e.g. glass matting) as this may help improve strength of the product prior to heating.
  • the calcium sulphate-based product further comprises silicone oil. Silicone oil is known to help minimise water absorption in calcium sulphate-based products. However, it appears that there is an interaction between the silicone oil and the clay additive which provides a surprising enhancement of this effect. Silicone oil is preferably included in the slurry an amount of between 0.6 - 2wt% (and most preferably around 2wt%) (based on the weight of the calcined gypsum and clay additive). This equates to an amount of 0.5 - 1.8wt% in the calcium sulphate-based product.
  • the calcium sulphate-based product may contain additives such as accelerators.
  • the accelerators may be, for example, freshly ground gypsum having an additive of sugar or surfactant.
  • Such accelerators may include Ground Mineral NANSA (GMN), heat resistant accelerator (HRA) and ball milled accelerator (BMA).
  • the accelerator may be a chemical additive such as aluminium sulphate, zinc sulphate or potassium sulphate.
  • a mixture of accelerators may be used, e.g. GMN in combination with a sulphate accelerator.
  • ultrasound may be used to accelerate the setting rate of the slurry, e.g. as described in US2010/0136259.
  • Figure 1 shows the linear shrinkage during heating
  • Figure 2 shows the development of flexural strength during heating
  • Figure 3 shows the development of Brinell hardness during heating; and Figure 4 shows a TGA trace for kaolin obtained from Sigma Aldrich.
  • Control Sample 2 10wt% kaolin plus silicone oil, glass fibres and glass matting
  • Control Sample 4 - 2wt% kaolin plus silicone oil, glass fibres and glass matting 585g of water at 40°C was mixed with 6.75g of John Mansville glass fibres and 15g of silicone oil.
  • 15g of kaolin and 735g of calcined gypsum was added to the water and the mixture was mechanically blended for 10 seconds to form a slurry.
  • a small amount of the slurry was poured into a 320mm x 120mm x 12.5mm silicone mould and glass tissue was pressed into the slurry to the base of the mould. The remaining slurry was poured into the mould and further layer of glass tissue was laid onto the top of the slurry.
  • the sample was dried at 40°C overnight (minimum 12 hours).
  • Control Sample 5 no kaolin plus 2wt% silicone oil, glass fibres and glass matting
  • Control Sample 6 no kaolin plus 2wt% silicone oil 140g of water at 40°C was mixed with 4g of silicone oil. 200g of calcined gypsum was added to the water and the mixture was blended by hand for 30 seconds to form a slurry. The slurry was poured into a cylindrical silicone mould (height 25mm, diameter 12mm) and the sample was dried at 40°C overnight (minimum 12 hours).
  • 600g of water at 40°C was mixed with 6.75g of John Mansville glass fibres.
  • 270g of kaolin and 480g of calcined gypsum was added to the water and the mixture was mechanically blended for 10 seconds to form a slurry.
  • the slurry was poured into a 320mm x 120mm x 12.5mm silicone mould and the sample was dried at 40°C overnight (minimum 12 hours).
  • 270g of kaolin and 480g of calcined gypsum was added to 600g of water at 40°C and the mixture was mechanically blended for 10 seconds to form a slurry.
  • the slurry was poured into a 320mm x 120mm x 12.5mm silicone mould and the sample was dried at 40°C overnight (minimum 12 hours).
  • 140g of water at 40°C was mixed with 4g of silicone oil. 128g of calcined gypsum and 72g of kaolin was added to the water and the mixture was blended by hand for 30 seconds to form a slurry. The slurry was poured into a cylindrical silicone mould (height 25mm, diameter 12mm) and the sample was dried at 40°C overnight (minimum 12 hours).
  • Kaolin sample 1 (36wt% kaolin) Minor sagging - no visible cracks
  • Control sample 1 (25wt% kaolin) Some sagging - cracks appearing
  • Linear shrinkage was measured using a Netzsch dilatometer.
  • the samples (kaolin sample 6 and control samples 6 and 7) were heated to 1000°C at a rate of 5°C/min.
  • the shrinkage was measured in-situ using a transducer having a resolution of 8nm.
  • Samples measuring 50 x 300mm x 14mm were supported on two supports separated by a span of 200mm. Force was applied to the centre of the board using a ZwickTM universal testing machine and the peak load to break the board (i.e. the flexural strength) was measured.
  • control sample 5 and kaolin sample 1 during heating was also tested and the results are shown in Figure 2.
  • control sample 5 was greater than that of kaolin sample 1 . Up to 750°C, both samples lose roughly the same amount of strength. At 920°C, both samples have no strength. At 975°C, kaolin sample 1 is beginning to gain strength whilst control sample 5 still has no strength. At 1000°C, kaolin sample 1 has gained more strength whilst control sample 5 still has none.
  • TGA Thermal Gravimetric Analysis

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Producing Shaped Articles From Materials (AREA)

Abstract

L'invention concerne un produit à base de sulfate de calcium, constitué de gypse et d'un additif argileux. L'additif argileux, qui peut être une argile à kaolin, représente plus de 22% du poids du produit. Le produit de l'invention s'obtient en séchant une boue aqueuse de gypse calciné et d'additif argileux, ce dernier représentant plus de 25 % du poids de la boue. Le produit, par exemple un panneau mural en gypse, fait preuve d'une résistance améliorée au retrait et d'une résistance mécanique accrue après exposition à la chaleur.
PCT/EP2014/059783 2013-05-22 2014-05-13 Produits ignifugés, à base de sulfate de calcium Ceased WO2014187703A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB201309225A GB201309225D0 (en) 2013-05-22 2013-05-22 Fire resistant calcium sulphate-based products
GB1309225.9 2013-05-22

Publications (1)

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WO2014187703A1 true WO2014187703A1 (fr) 2014-11-27

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PCT/EP2014/059783 Ceased WO2014187703A1 (fr) 2013-05-22 2014-05-13 Produits ignifugés, à base de sulfate de calcium

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AR (1) AR096389A1 (fr)
GB (1) GB201309225D0 (fr)
TW (1) TW201500321A (fr)
WO (1) WO2014187703A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170006875A (ko) * 2015-07-10 2017-01-18 주식회사 케이씨씨 방화 석고 보드 조성물
CN109665794A (zh) * 2018-12-29 2019-04-23 泰山石膏有限公司 一种重质脱硫抹灰石膏
WO2022029584A1 (fr) 2020-08-07 2022-02-10 Georgia-Pacific Gypsum Llc Panneaux ignifuges de gypse et procédés
US11339572B1 (en) 2017-01-23 2022-05-24 Gold Bond Building Products, Llc Method of manufacturing gypsum board with improved fire
WO2025027414A1 (fr) * 2023-07-28 2025-02-06 Georgia-Pacific Gypsum Llc Additifs de panneau pour transfert de chaleur et procédés de fabrication

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Publication number Priority date Publication date Assignee Title
US2420863A (en) * 1943-05-07 1947-05-20 A P Green Fire Brick Company Dry press insulating fire brick
US2526066A (en) 1944-09-08 1950-10-17 Certain Teed Prod Corp Plastic composition materials and products made therefrom
US2744022A (en) 1952-07-30 1956-05-01 Certain Teed Prod Corp Plaster compositions and products
US3616173A (en) 1967-08-29 1971-10-26 Georgia Pacific Corp Fire resistant wallboard
AU5584480A (en) * 1979-03-06 1980-09-11 Australian Gypsum Limited Fire rated gypsum board
US4664707A (en) 1985-04-09 1987-05-12 Georgia-Pacific Corporation Fire resistant gypsum composition
US5723226A (en) * 1995-06-07 1998-03-03 G-P Gypsum Corporation Gypsum-containing compositions and fire-resistant articles
WO2003004432A1 (fr) * 2001-07-06 2003-01-16 G-P Gypsum Corporation Constituants de porte coupe-feu et portes coupe-feu comprenant lesdits constituants
US6569541B1 (en) 1999-02-12 2003-05-27 Lafarge Platres Plaster-based prefabricated structural element exhibiting water resistance
US20030138614A1 (en) 2000-07-18 2003-07-24 Claude Leclercq Plasterboard composition, preparation of this composition and manufacture of plasterboards
WO2010036512A2 (fr) * 2008-09-25 2010-04-01 United States Gypsum Company Composition cimentaire légère à base de cendre volante présentant une résistance élevée à la compression et une prise rapide
US20100136259A1 (en) 2005-10-19 2010-06-03 O'keefe Sam Cementitious Board Manufacture

Patent Citations (12)

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US2420863A (en) * 1943-05-07 1947-05-20 A P Green Fire Brick Company Dry press insulating fire brick
US2526066A (en) 1944-09-08 1950-10-17 Certain Teed Prod Corp Plastic composition materials and products made therefrom
US2744022A (en) 1952-07-30 1956-05-01 Certain Teed Prod Corp Plaster compositions and products
US3616173A (en) 1967-08-29 1971-10-26 Georgia Pacific Corp Fire resistant wallboard
AU5584480A (en) * 1979-03-06 1980-09-11 Australian Gypsum Limited Fire rated gypsum board
US4664707A (en) 1985-04-09 1987-05-12 Georgia-Pacific Corporation Fire resistant gypsum composition
US5723226A (en) * 1995-06-07 1998-03-03 G-P Gypsum Corporation Gypsum-containing compositions and fire-resistant articles
US6569541B1 (en) 1999-02-12 2003-05-27 Lafarge Platres Plaster-based prefabricated structural element exhibiting water resistance
US20030138614A1 (en) 2000-07-18 2003-07-24 Claude Leclercq Plasterboard composition, preparation of this composition and manufacture of plasterboards
WO2003004432A1 (fr) * 2001-07-06 2003-01-16 G-P Gypsum Corporation Constituants de porte coupe-feu et portes coupe-feu comprenant lesdits constituants
US20100136259A1 (en) 2005-10-19 2010-06-03 O'keefe Sam Cementitious Board Manufacture
WO2010036512A2 (fr) * 2008-09-25 2010-04-01 United States Gypsum Company Composition cimentaire légère à base de cendre volante présentant une résistance élevée à la compression et une prise rapide

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Title
FARID ALFAWAKHIRI ET AL: "Fire Resistance of Loadbearing Steel-Stud Wall Protected with Gypsum Board: A Review", FIRE TECHNOLOGY, KLUWER ACADEMIC PUBLISHERS, BO, vol. 35, no. 4, 1 November 1999 (1999-11-01), pages 308 - 335, XP019241421, ISSN: 1572-8099, DOI: 10.1023/A:1015401029995 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170006875A (ko) * 2015-07-10 2017-01-18 주식회사 케이씨씨 방화 석고 보드 조성물
KR101707060B1 (ko) 2015-07-10 2017-02-16 주식회사 케이씨씨 방화 석고 보드 조성물
US11339572B1 (en) 2017-01-23 2022-05-24 Gold Bond Building Products, Llc Method of manufacturing gypsum board with improved fire
US12031328B2 (en) 2017-01-23 2024-07-09 Gold Bond Building Products, Llc Method of manufacturing gypsum board with improved fire resistance
CN109665794A (zh) * 2018-12-29 2019-04-23 泰山石膏有限公司 一种重质脱硫抹灰石膏
CN109665794B (zh) * 2018-12-29 2021-12-24 泰山石膏有限公司 一种重质脱硫抹灰石膏
WO2022029584A1 (fr) 2020-08-07 2022-02-10 Georgia-Pacific Gypsum Llc Panneaux ignifuges de gypse et procédés
WO2025027414A1 (fr) * 2023-07-28 2025-02-06 Georgia-Pacific Gypsum Llc Additifs de panneau pour transfert de chaleur et procédés de fabrication

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AR096389A1 (es) 2015-12-30
GB201309225D0 (en) 2013-07-03
TW201500321A (zh) 2015-01-01

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