Description The present invention relates to the field of adhesives and especially to the field of moisture curing, or hardening, adhesives. The present adhesives provide high strength, i.e. at least more than 4 N/mm ² , adhesion of materials such as wood, concrete, plastics, stone etc. while having a high moisture resistance.

An adhesive is a substance applied to the surface of materials for binding them together and resisting separation. The term "adhesive" may be used interchangeably with glue, cement, mucilage, or paste. The use of adhesives offers many advantages over other binding techniques such as sewing, mechanical fastening, thermal bonding, etc. These advantages include the ability to bind different materials together and to distribute stress more efficiently across a joint.

Moisture curing adhesives cure on exposure to moisture present in the substrate, atmosphere or environment. The curing reaction generally takes place from 5° to 50°C at a relative humidity of 40 to 100%. Under low humidity conditions or where the substrates are impermeable to moisture, moisture can be added during the assembly process to facilitate curing.

Moisture curing polyurethanes are formulated to cure with ambient water and are synthesized from isocyanates, such as aromatic diisocyantes, toluene diisocyanate (TDI) or methylene diphenyl diisocyanate (MDI) and polyols, such as polyether polyols or polyester polyols. Although moisture curing polyurethanes have been and are used in adhesive and coating industries, a major drawback of these adhesives is the inherent use and presence of highly toxic isocyanates. Amongst others considering the high toxicity of isocyanates, there is a continuous need in the art for alternative for moisture curing polyurethane based adhesives.

It is an object of the present invention, amongst other objects, to provide alternatives for polyurethane based adhesives.

The above object, amongst other objects, is met by the present invention through providing a high strength and moisture curing adhesives as outlined in the appended claims.

Specifically, the above object, amongst other objects, is, according to a first aspect, met by the present invention by providing high strength and moisture-curing adhesives comprised of:

a) 25 to 75 % (wt) of one or more modified polyethers;

b) 10 to 60% (wt) of one or more filler material;

c) 0.3 tol5% (wt) of one or more adhesion promotors; wherein the present adhesive further comprises one or more compounds selected from the group consisting of a radical scavenger, a moisture scavenger, an anti-oxidant, a rheological modifier, and a catalyst.

According to an especially preferred embodiment of this first aspect, the present invention relates to strength and moisture -curing adhesives comprised of:

a) 25 to 75 % (wt) of one or more modified polyethers;

b) 10 to 60% (wt) of one or more siliceous filler materials; c) 0.3 to 5.0% (wt) of one or more epoxy functionalized alkoxy silanes; d) 0.3 to 5.0% (wt) of one or more amino functionalized alkoxy silanes; e) 0.3 to 5.0 % (wt) or one or more amino fuctionalized siloxanes;

f) a radical scavenger, preferably 0.1 to 0.5% (wt);

g) a moisture scavenger, preferably 0.5 to 5% (wt);

h) an anti-oxidant, preferably 0.1 to 1% (wt);

i) a rheological modifier, preferably 0.2 to 5.0% (wt); and

j) a catalyst, preferably 0.05 to 5% (wt).

Within the context of the present invention weight percentage or % (wt) is defined as the weight of the indicated compound, or composition, as a percentage of the total weight of the present high strength and moisture curing adhesive.

Within the context of the present invention, high strength is defined as:

1) having a strength of more than >10 N/mm ² after 7 days in a standard

atmosphere;

2) having a strength of more than >4 N/mm ² after 7 days in a standard

atmosphere and 4 days in water at 20 ± 5 °C;

3) having a strength of more than >4 N/mm ² after 7 days in a standard

atmosphere 6 hours in boiling water and 2 hours in water at 20 ± 5 °C; wherein the present strength is determined in accordance with EN 204: Classification of thermoplastic wood adhesives for non-structural applications and EN205: Wood adhesives for nonstructural applications or determination of tensile shear strength of lap joints.

4) having a strength of more than > 5.5 N/mm ² after 7 days in standard

atmosphere 1 hour in a preheated fan oven, at 80 ± 2,0 °C for 60 ± 2 min wherein the present strength is determined in accordance with EN 14257: Determination of tensile strength of lap joints at elevated temperature (WATT 91)

According to a preferred embodiment of this first aspect of the present invention, the present modified polyether has a dynamic viscosity in the range of 250 tol50,000 mPa.s., preferably 250 to 50,000 mPa.s. wherein 1 Pa.s is 1 kg- m ^_1 - s ^_1 . According to another preferred embodiment, the present modified polyether is composed of one or more silane modified polyethers, preferably a-silane modified polyethers such 2 or 3 silane modified polyethers or α-silane modified polyethers although polyethers composed of four, five, six or seven or more are contemplated within the context of the present invention.

Silane modified polyethers are comprised of silane moieties coupled to polyether backbones. Alternatively, polyether chains can also be end-capped with di-or trialkoxysilyl groups provided through urethane coupling with an aliphatic bridge positioned between the urethane group and the silane. This aliphatic bridge can be a methylene group providing an a-silane-terminated polyether. An especially preferred α-silane modified polyether according to the present invention is a silane-modified polymers designated as GENIOSIL ^® XB 502 (viscosity 700 tol400 mPa.s.), GENIOSIL ^® STP-E10 (viscosity 7,000 to 13,000 mPa.s.) and GENIOSIL ^® STP-E30 (viscosity 25,000 to 45,000 mPa.s.) available from Wacker (Munich, Germany).

According to a preferred embodiment of the invention, the present high strength and moisture resistant adhesives comprise 25 to 75% (wt) of a modified polyether, preferably 45 to 70% (wt%), more preferably 50 to 65% (wt). Examples of suitable weight percentages of the present modified polyether include 40%, 55% or 60%.

The present high strength and moisture resistance adhesive comprise one or more filler materials, preferably filler materials with a BET surface area up to 50 m ² /g. The present filler materials are, according to a preferred embodiment, one or more filler material selected from the group consisting of limestone, mineral fillers such as calcium carbonate, ultrafine precipitated calcium carbonate grades, dolomite, calcium magnesium carbonate, calcite, marble, silicious earth, kaolin, clay, talc, magnesium silicate, Mica or silicate phyllosilicate minerals such as biotite, lepidolite, muscovite, phlogopite, zinnwoldite and clintonite, bariumsulfate, titandioxide, ironoxide, carbon black, quarz, siliciumdioxid, diatomaceous earth, calcium silicate, zirconium silicate, aluminum silicate, amorphous silica-alumina, zeolithe, metaloxide, aluminiumoxide, titaniumoxide, ironoxide, zincoxide, bariumsulphate, plaster, silicon carbide, boron nitride, glass and plastic powder, fibers, polyacryl nitrile powder, aluminiumtrihydroxide, anhydrite, feldspar, synthetic corundum, gypsum, silicon nitride, silicon carbide, boron nitride or fillers with a BET surface area of higher as 50 m ² /g such as amorphous silica, synthetic silica, hydrophobic silica, hydrophilic silica modified fuced silica, furnace and acetylene black and mixed silicon /aluminium oxides.

According to yet another preferred embodiment of this first aspect of the invention, the present high strength and moisture resistant adhesives comprise 10% to 60% (wt) of one or more filler material, preferably 20% to 55% (wt), more preferably 30% to 50% (wt).

Examples of suitable weight percentages of the present filler material include 25%, 35% or 45%. According to yet another preferred embodiment of this first aspect of the present invention the one or more filler material is siliceous sedimentary rock, preferably Neuburg Siliceous earth such as Sillitin N82, Sillitin N85, Sillitin N87, Sillitin V85, Sillitin V88, Sillitin Z86, Sillitin Z89, Sillikoid P87, Silfit Z19, puriss or silane coated types, such as Aktifit VM, Aktifit AM, Aktisil VM 56, Aktisil VM 56/89, Aktisil MAM, Aktisil MAM-R, Aktisil EM, Aktisil AM, Aktisil MM Aktil WW, Aktisil PF 77, Aktisit PF 14, Aktifit PF 111

Neuburg siliceous Earth is a natural combination of corpuscular, cryptocrystalline and amorphous silica and lamellar kaolinite and is available from Hoffmann Mineral GmbH (Neuburg, Germany). A preferred Neuburg Siliceous Earth according to the present invention is Sillitin V85 available from Hoffmann Mineral GmbH (Neuburg, Germany)

According to yet another preferred embodiment of the first aspect of the invention, the present high strength and moisture resistant adhesive comprise 10% to 60% (wt) of one or more siliceous filler material, preferably 20% to 55% (wt), more preferably 30% to 50% (wt). Examples of suitable weight percentages of the present siliceous filler material include 25%, 35% or 45%.

The present high strength and moisture resistant adhesives comprise one or more adhesion promotors, such as two or more or three or more. Preferably, the present one or more adhesion promotors are present in an amount a total amount of 0.3 to 15% (wt) such as 0.3%, 0.6%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4% , 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14.0%, 14.5% or 15%.

According to the present invention, preferred one or more adhesion promotors suitable to be used are chosen from the group consisting of

an epoxy functionalized alkoxy silane such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyl methyldimethoxysilane, 3- glycidoxypropyl methyldiethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl

trimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl triethoxysilane, 2-(3,4- epoxycyclohexyl)ethyl methyldimethoxysilane, 2-(3 ,4-epoxycyclohexyl)ethyl methyldiethoxysilane, Epoxy silane Polymer;

an amino functionalized alkoxy silane or siloxanes such as 3- aminopropyltriethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, N- 2-(aminoethyl)-3-aminopropyltriethoxysilane, N-2-(aminoethyl)-3- aminopropylmethyldimethoxysilane , 3 -aminopropylmethyldiethoxysilane , 3 - ureidopropyltrimethoxy silane, 3-ureidopropyltriethoxysilane, benzylamino-silane, N-phenyl-gamma-aminopropyltrimethoxysilane, N- phenylaminomethyltrimethoxysilane , N- cyclohexylaminomethylmethyldiethoxysilane , N- cyclohexylaminomethyltriethoxysilane, N-ethyl-3-trimethoxysilyl- methylpropamine, N-cyclohexyl-3-aminopropyltrimethoxysilane, 3-(2- aminomethylamino)propyltriethoxy silane , (cyclohexyl)methyldimethoxysilane , dicyclopentyldimethoxysilane, phenyltriethoxysilane, phenyltriethoxysilane, oligomeric diamino silane/ aminofunctional oligosiloxane, cyclo[3-((2

aminoethyl)amino)propyl] methylsiloxaan, poly[3-(2- aminoethyl)aminopropyl] methyl siloxaan, polydimethylsiloxane compounds with aminoalkyl groups, 3-aminofunctional silane, multifunctional aminosilane, aminofunctional silane and siloxane primer, aminofunctional siloxane, silane terminated poly ether + additive, N-(n-butyl)-3-aminopropyltrimethoxysilane, bis (3-trimethoxysilylpropyl)amine, bis (3-triethoxysilylpropyl)amine, amino functional silane oligomer, amino-functional oligosiloxane, N-2-(Aminoethyl)-3- aminoPropylmethyldiethoxysilane, N-2-(Aminoethyl)-3- aminooisoButylmethyldimethoxysilane, 3-AminopropylMethyldimethoxysilane, 3- (2-(2-Aminoethylamino)ethylamino)propyltrimethoxysilane, N-(n-butyl)-3- aminopropyltriethoxysilane, Diamino silane mixture, 3-

Anilinopropyltrimethoxy silane, Ν,Ν-Diethylaminopropyltrimethoxysilane, N,N- Dimethylaminopropyltrimethoxysilane, Butylaminemethyltriethoxysilane, N- cyclohexyl(aminomethyl)triethoxysilane, 2-

Aminoethylaminomethyltriethoxysilane, Diethylaminomethyltriethoxysilane, Amino silane hydrolysate, Amino silane Polymer

an anhydride functionalized alkoxy silane such as 3-(triethoxysilyl)propyl- succinicanhydride or thiocarboxylate functional silane

an alkyl functionalized alkoxy silane such as dodecyltrimethoxy silane, octadecyltrimethoxy silane, n-octyltriethoxy silane, methyltrimethoxysilane, me thy ltriethoxy silane, n-propyltriethoxysilane, n-propyltrimethoxy silane, n- octyltrimethoxy silane , dimethyldimethoxy silane , dimethyldiethoxy silane , hexadecyltrimethoxysilane, trimethylethoxy silane,

(cyclohexyl)methyldimethoxysilane, dicyclopentyldimethoxysilane; n- Dodecylmethyldiethoxy silane , n-Dodecyltriethoxysilane ,

Octadecyltriethoxysilane, n-Hexadecyltriethoxysilane, Tetraethoxysilane-28 , Tetraethoxysilane-32, Tetraethoxysilane-40, 1,2 Bis(triethoxysilyl)ethane, 1,2 Bis(trimethoxysilyl)ethane, Methylpropyldiethoxysilane,

Methylpropyldimethoxysilane, Isooctyltriethoxysilane,

Octylmethyldimethoxysilane, Octylmethyldiethoxysilane, n- Octadecylmethyldimethoxysilane, n-Octadecylmethyldiethoxysilane an chloro functionalized alkoxy silane such as 3-chloropropyltriethoxysilane, 3- chloropropyltrimethoxy silane , 3 -chloropropylmethyldimethoxysilane, 3 - chloropropylmethyldiethoxysilane, Trichlorosilane, Methylpropyldichlorosilane, 3- chloropropyltrichlorosilane, 3-chloropropyldichloromethylsilane, n- Propyltrichlorosilane, 3-Acetoxypropylmethyldichlorosilane, Vinyltrichlorosilane, n-Octyltrichlorosilane, Isooctyltrichlorosilane, Octyl(methyl)dichlorosilane, n- Dodecyltrichlorosilane, n-Dodecylmethyldichlorosilane, n- Hexadecyltrichlorosilane, n-Hexadecylmethyldichlorosilane, n- Octadecyltrichlorosilane, n-Octadecylmethyldichlorosilane,

Chloromethyltrichlorosilane, Chloromethyltriethoxysilane, 3- Chloropropyltriethoxysilane, 3-Chloropropyltrimethoxysilane, 3- Chloropropylmethyldimethoxysilane, 3-Chloropropylmethyldiethoxysilane, 3- Chloropropylmethyldipropoxysilane

an phenyl functionalized alkoxy silane such as phenyltrichlorosilane,

phenyltriethoxysilane, phenyltrimethoxy silane, dichlorodiphenylsilane, diphenyldimethoxysilane, diphenyldiethoxysilane, methylphenyldimethoxysilane, methylphenyldiethoxysilane

an acryloxy functionalized alkoxy silane such as 3- methacryloxypropyltrimethoxysilane , 3 - methacryloxypropylmethyldimethoxysilane, 3- methacryloxypropylmethyldiethoxysilane , 3 -me thacryloxypropylTriethoxy silane , (methacryloxymethyl) -methyldimethoxysilane ,

methacryloxymethyltrimethoxysilane, (methacryloxymethyl)- methyldiethoxy silane, methacryloxymethyltriethoxysilane, 3- methacryloxypropyltriacetoxysilane, 3-Methacryloxypropyltriisopropoxysilane, 3- Acetoxypropyltrimethoxy silane, 3 - Aery loxypropyltrimethoxy silane , (3 - Acryloxypropyl)methyldimethoxysilane, Triacetoxyethylsilane, 1 ,2- Bis(triethoxysilyl)ethan, Methacrylicsilane preparation, Methacrylicsilane preparation, Alkoxyl silane Polymer, n-Propyltriecetoxysilane, Modified acetoxy silane, 3-Mercaptopropyltrimethoxysilane, 1 ,2-bis(trimethoxysilyl)ethane, Tetramethoxysilane, Tetraethoxysilane, Tetrapropoxysilane

a sulf functionalized alkoxy silane such as bis[3-(triethoxysilyl)propyl]tetrasulfide, 3-Mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3- thiocyanatopropyltriethoxysilane, 3-(isocyanatopropyl)-trimethoxysilane an trialkoxy functionalized silane such as trimethoxysilane, 3- isocyanatopropyltriethoxysilane, 3-isocyanatopropyltrimethoxysilane, (isocyanatomethyl)methyldimethoxysilane, N-methyl[3-(trimethoxysilyl)- propyl]carbamate, N-trimethoxysilylmethyl-O-methylcarbamate, N- dimethoxy(methyl)silylmethyl-0-methyl-carbamate, Methyldimethoxysilane, Methyldiethoxy silane, Tris-[3-(trimethoxysilyl)propyl]-isocyanurate According to an especially preferred embodiment of the present invention, the present adhesion promotors are selected from the group consisting of an epoxy functionalized alkoxy silane, in an amount of 0.3 to 5.0% (wt) and an amino functionalized alkoxy silane, in an amount of 0.3 to 5.0% (wt) and an amino functionalized siloxane, preferably cyclo[3-((2 aminoethyl)amino)propyl] methylsiloxaan, poly[3-(2-aminoethyl)aminopropyl]methyl siloxaan in amount of 0.3 to 5.0 % (wt).

Preferably, the present one or more adhesion promotors are present in an amount of 0.3 to 15 % (wt) such as 0.3,%, 0.6%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4,0%, 4.5%, 5.0%, 5.5%, 6.0%, 6.5%, 7.0%, 7,5%, 8.0%, 8.5%, 9,0%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14.0%, 14.5% or 15% (wt).

Epoxy functionalized alkoxy silanes hydrolyze in the presence of moisture to form silanols, which than can react with themselves to produce siloxanes. In addition, it leads to an increase in water resistance.

According to yet another preferred embodiment of this first aspect of the invention, the present high strength and moisture resistant adhesives comprise 0.3% to 5.0% (wt) of one or more epoxy functionalized alkoxy silane, preferably 1.0% to 4.0% (wt), more preferably 2.0% to 3.0% (wt). Examples of suitable weight percentages of the epoxy functionalized alkoxy silane include 1.8%, 2.3% or 2.8%.

Amino functionalized alkoxy silanes as an adhesion promotor to improve the mechanical properties e.g. mechanical strength. In addition, it leads to an increase in water resistance. Due to the nature of the amino group, this substance reacts as a base. The silane hydrolyzes autocatalytically in the presence of moisture (methanol is released) to form silanols, which can subsequently react with themselves to produce siloxanes or can bind to inorganic substrates.

According to yet another preferred embodiment of this first aspect of the invention, the present high strength and moisture resistant adhesives comprise 0.3% to 5.0% (wt) of one or more amino functionalized alkoxy silane, preferably 1.0% to 4.0% (wt), more preferably 2.0% to 3.0% (wt). Examples of suitable weight percentages of the amino functionalized akoxy silane include 1.8%, 2.3% or 2.8%.

Amino functionalized siloxanes are used as an adhesion promotor to improve, amongst others, hydrophobicity e.g. improvement of water resistance . In addition, amino functionalized siloxanes provide an improved adhesion on wood. An especially preferred amino functionalized siloxane according to the present invention is an amino functionalized siloxane designated as Wacker GF 995 available from Wacker Munich, Germany

According to yet another preferred embodiment of this first aspect of the invention, the present high strength and moisture resistant adhesives comprise 0.3% to 5.0% (wt) of one or more amino functionalized siloxane, preferably 1.0% to 4.0% (wt), more preferably 2.0% to 3.0% (wt). Examples of suitable weight percentages of the amino functionalized siloxane include 1.8%, 2.3% or 2.8%.

The high strength and moisture resistant adhesive comprise a radical scavenger preferably selected from the group of hindered amine light stabilisers or UV absorbers such as benzotriazole, benzophenone, oxanilide or hydroxyphenyltrianzine.

The high strength and moisture resistant adhesive comprise a moisture scavenger preferably selected from the group of vinyl functionalized alkoxy silanes such as

vinyltriethoxysilane, vinyltrimethoxysilane, dichloromethylvinylsilane,

dimethoxymethylvinylsilane, diethoxymethylvinylsilane, vinyltriacetoxysilane,

chlorodimethylvinylsilane, vinyltrichlorosilane, vinyltris(2-methoxyethoxy)silane, 1,3,5,7- tetravinyl-l,3,5,7-tetramethylcyclotetrasiloxane, oligomeric vinylsilane,

Vinyltri(isopropoxy)silane, Vinyl silane Polymer, Vinylsilane preparation, Vinyltriacetoxysilane.

The high strength and moisture resistance adhesive comprise an antioxidant such as a primary antioxidant or a secondary antioxidant, hindered phenl AO, phosphite AO or thioether AO

The present high strength and moisture resistant adhesive comprise a rheological modifier preferably selected from the group consisting of a polyolefin blend, hydrophobic silica, hydrophilic silica, polyamide wax and ultra fine precipitated calcium carbonate grades

The high strength and moisture resistant adhesive comprise a catalyst a dibasic Amine, tin compounds and a titanate catalyst

According to a second aspect, the present invention relates to the use of a combination of an a-silane modified polyether, Neuburg Siliceous Earth filler material and the combination of an epoxy functionalized alkoxy silane an amino functionalized alkoxy silane and an amino functionalized siloxane for providing an adhesive, wherein, preferably, the a-silane modified polyether is Geniosil XB 502, the Neuburg Siliceous Earth filler material is Sillitin V85 an Epoxy functionalized alkoxy silane an amino functionalized alkoxy silane and an amino functionalized siloxane is Wacker GF 995.

The present invention will further be illustrated in the following example of an especially preferred embodiment of the present invention. Example

The following composition providing a high strength and moisture resistant adhesive was prepared (amounts are indicated in (wt)):

Composition

MA 480 54.20

Polymer ST 80 54.20

Geniosil XB 502 40.98 40.98 40.98 42.14 40.98 42.14 40.98 40.98 40.98

Silane modified 13.66 13.66 13.66 14.05 13.66 14.05 13.66 13.66 13.66 polyether

Vinyltrimethoxy 3.28 3.25 3.35 3.28 3.28 3.37 3.28 3.37 3.28 3.28 3.28 silane

HALS 0.55 0.54 0.54 0.55 0.55 0.55 0.55 0.55 0.55 0.55 0.55

Benzene 0.55 0.54 0.54 0.55 0.55 0.55 0.55 0.55 0.55 0.55 0.55 propanoic acid,

Sillitin V85 32.79 32.52 32.52 32.79 32.79 32.79 32.79 32.79 32.79

Filler material B 32.79

Filler material C 32.79

3- 2.73 2.71 2.71 2.73 2.73 2.81 2.73 2.73 2.73

Glycidoxypropyl

trimethoxysilane

3- 2.73

Glycidoxypropyl

Methyldiethoxy

silane

cyclo[3-((2 2.73 2.71 2.71 2.73 2,73 2.81 2,73 2,73 2,73 aminoethyl)

amino)propyl]

methylsiloxaan,

poly[3-(2- aminoethy 1) amin

opropyl] methyl

siloxaan

N-2- 2.73 2.71 2.71 2.73 2.73 2.81 2.73 2.81 2.73

(Aminoethyl)-3- amino

Propylmethyl

dimethoxysilane 3-Aminopropyl 2.73 triethoxysilane

N-2- 2.73 2.73

(Aminoethyl)-3- aminopropyl

trimethoxysilane

Tin Catalyst 0.81 0.81

Results

Conditioning 12.68 7.88 9.6 11.2 10.8 12.7 13.2 11.0 10.8 10.8 12.5 sequence 1

> 10 N/mm ²

Conditioning 5.2 0.73 2.03 3.30 2.50 3.2 5.6 1.7 2.7 5.0 4.4 sequence 3

> 4 N/mm ²

Conditioning 4.1 0.43 1.53 3.01 3.10 3.6 4.8 3.0 2.7 5.1 4.8 sequence 5

> 4 N/mm ²

WATT 91 9.11 4.85 5.83 8.2 7.6 8.11 9.3 7.3 7.5 6.1 8.7 > 5,5 N/mm ²

The above adhesive was tested in conformity with EN204/EN205 and the test conditions can be summarized as: Wood species: Beech (Fagus Sylvatica)

Moisture content of wood: 12+1%

Conditioning: 20±2°C and 65+5% r.h.

Surface treatment before gluing: sanding with abrasing paper grit size 100

Number of test specimen: 20

Adhesive layer: thin

Gluing area: 200 mm2

Testing speed: 50 mm/min

Test Temperature: 23+2°C

Gluing temperature: 20+2°C

Gluing conditions

Coverage: 150 - 300 /m2

Application of glue: to one or both surfaces Pressure: 0.2 and 1,0 N/mm

Pressure time: 60 and 600 min

Under the above conditions, the present adhesives provided:

NEN-EN 14257: Determination of tensile strength of lab joints at elevated temperature.