Adhesives & Sealants

8,064 products found in Adhesives & Sealants
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Esacure Tzt product card banner

IGM Resins

Esacure TZT

Function: Photoinitiator

Chemical Family: Benzophenones

End Uses: Radiation Curable Ink, Other Ink Types, Radiation Curable Adhesive, Radiation Curable Coating

Esacure TZT is particularly indicated for the photo polymerisation of UV curable systems when high reactivity, low curing odor and low yellowing are required. The radical generation occurs via hydrogen abstraction by the action of a co-initiator such as tertiary amines.

Esacure One product card banner

IGM Resins

Esacure ONE

Function: Photoinitiator

Chemical Family: Ketones

CAS Number: 163702-01-0

End Uses: Radiation Curable Ink, Reactive Adhesive, Powder Coating, Radiation Curable Coating

Esacure ONE is a difunctional alpha-hydroxy ketone photoinitiator. It is a highly reactive difunctional photoinitiator particularly suitable for clear systems. Due to its molecular structure it is particularly suitable for all systems where low VOC, low migration and low extraction values are needed (food packaging).

Omnirad 819 product card banner

IGM Resins

Omnirad 819

Function: Photoinitiator

CAS Number: 162881-26-7

End Uses: Waterborne Adhesive, Radiation Curable Coating, Waterborne Coating

Compatible Polymers & Resins: Polyesters

Omnirad 819 is a versatile photoinitiator for radical polymerization of unsaturated resins upon UV light exposure. It is especially suitable for white pigmented Formulations, the curing of glass-fiber-reinforced polyester/styrene systems and for clear coats for outdoor use in combinations with light stabilizers. Thick section curing is also possible with this photoinitiator.

Calprene® 719 product card banner

Dynasol Elastomers

Calprene® 719

Polymer Name: Styrene Butadiene Styrene (SBS)

Function: Stabilizer, Binder

Chemical Family: Styrenics, Styrene Copolymers

Additives Included: Antioxidant

Labeling Claims: Food Contact Acceptable, Butylated Hydroxytoluene-free, Other Labeling Claims

Calprene 719 is a new 70/30 butadiene/styrene Thermoplastic copolymer, polymerized in solution and having a radial structure.This product is stabilized with a non-staining antioxidant system, essentially gel free with a very clear color.Calprene 719 is a BHT* and nonylphenol free SBS, FDA approved and suitable for food contact applications.Calprene 719 is supplied in porous crumb.*(BHT content in pure polymer less than 30ppm).

Emulprene™ 1009l product card banner

Dynasol Elastomers

Emulprene™ 1009L

Polymer Name: Styrene Butadiene Block Copolymer

Chemical Family: Styrene Copolymers, Styrenics

Additives Included: Antioxidant

Synonyms: Tris(P-Nonylphenyl)Phosphite, Tris (4-Nonylphenyl)Phosphite

Emulprene 1009L is hot emulsion styrene-butadiene copolymer, slightly cross-linked with divinylbenzene. It is polymerized using fatty acid as emulsifier, coagulated with salt acid and stabilized with a non-staining antioxidant.

Solprene® 9618 product card banner

Dynasol Elastomers

Solprene® 9618

Polymer Name: Styrene Butadiene Styrene (SBS)

Chemical Family: Styrene-Butadiene Copolymer

Additives Included: Antioxidant

Processing Methods: Compounding

Solprene 9618 is a 69/31 Butadiene-Styrene multi arm copolymer, polymerized in solution process.It is stabilized with non-staining antioxidant system.This product is presented as a free flowing porous pellet for easy handling and dissolution.Solprene 9618 is designed to be used in high performance adhesive formulations.

Solprene® 1217 product card banner

Dynasol Elastomers

Solprene® 1217

Polymer Name: Solution Styrene Butadiene Rubber (SSBR)

Function: Processing Aid, Binder

Chemical Family: Styrene-Butadiene Copolymer

Additives Included: Antioxidant

Labeling Claims: Food Contact Acceptable, Butylated Hydroxytoluene-free, Other Labeling Claims

Solprene 1217 is a linear random-block styrene-butadiene copolymer with a total content of 25% of styrene, 17.5% is present as a polystyrene block.It has a non-staining antioxidant system. Is BHT/TNPP free; FDA approved for use in food contact applications. Is essentially gel free with a clear color.Solprene 1217 is used as compounding ingredient for adhesives, as modifier for thermoplastic resins. It is an excellent modifier for asphalt, formulations of caulks and sealants; it is also an excellent processing aid for most polymers, giving a good resistance to low temperature. Used in extruded goods, soles, and heels.

Ethylene Vinyl Acetate (Eva) H2201 product card banner

Petro Rabigh

ETHYLENE VINYL ACETATE (EVA) H2201

Polymer Name: Ethylene Vinyl Acetate Copolymer (EVA)

ETHYLENE VINYL ACETATE (EVA) H2201 contains 18% ethylene vinyl acetate copolymer resin, and is designed for a variety of foam application.

Moldx® S45 product card banner

Huber Engineered Materials

MoldX® S45

Function: Flame Retardant

Chemical Family: Aluminum Compounds

Flame Rating: UL 94 5VA, UL 94 V0

MoldX® S45 is engineered to allow higher loadings versus standard alumina trihydrate (ATH) products and offers excellent processing from 180 phr to as high as 240 phr.

Cleartack® W 100 product card banner

Cray Valley

Cleartack® W 100

Chemical Family: Styrenics

End Uses: Pressure Sensitive Adhesive, Hot-Melt Adhesive

Compatible Substrates & Surfaces: Elastomers & Rubbers, Plastics

Features: Good Compatibility, Good Tack, Good Color Stability, Thermal Resistance

Cleartack® W 100 is a water white pellet, low odor, pure styrenic monomer resin that is produced by cationic polymerization.

Kradasol™ product card banner

TBF Environmental Technology Inc.

KradaSol™

Labeling Claims: Recyclable, Low VOC, Environmentally Friendly, Other Labeling Claims, Non-Carcinogenic, VOC-free, Benzene-free, HAPs-free

Purity (Assay): 99.5 - 99.5 %

Features: Low Toxicity

KradaSol™ is a VOC-compliant, safe, low toxicity solvent that is an efficient, cost effective alternative to Hexane, Xylene, Cyclohexane, Toluene and Perchloroethylene.

Tafigel® Pur 40 product card banner

Munzing

TAFIGEL® PUR 40

Function: Rheology Modifier, Thickener

Chemical Family: Bentonite, Urethanes, Polyurethanes (PU)

End Uses: Waterborne Coating, Waterborne Adhesive, Waterborne Ink

Labeling Claims: Low VOC

Physical Form: Dispersion, Liquid

ONLY AVAILABLE OUTSIDE EUROPEAN UNION! TAFIGEL PUR 40 is designed as an "associative thickener" which builds up and stabilizes viscosity by forming a network between polyurethane, binder molecules and pigment particles. TAFIGEL PUR 40 can be used alone or in combination with other TAFIGEL thickeners as well as with further thickener technologies. TAFIGEL PUR 40 is recommended for use in following systems: Interior and exterior paints, latex paints, anti-corrosive paints, emulsion plasters, adhesives and joint fillers.

Aldirez A product card banner

Incorez Ltd

Aldirez A

Function: Curing Agent

End Uses: 2K (2 component) Coating, Primer

Compatible Polymers & Resins: Polyurethanes (PU), Other Compatible Resins

Features: Low Viscosity, Low Temperature-Curing

Bubbling. It’s a problem which pops up time and time again, particularly in areas subject to low temperature and high humidity levels. Fortunately, under these conditions, Aldirez A provides the ability to create primers that remain remarkably resilient and bubble-free. In addition to its exceptional ability to inhibit CO2 generation, formulators are able to accelerate the cure of PU primers, to improve turnaround efficiency, whilst retaining a workable pot life.

Velsiflex® 342 product card banner

Velsicol

Velsiflex® 342

Function: Plasticizer

Chemical Family: Benzoates, Diols, Carboxylic Acids & Derivatives, Glycols

End Uses: Plastisol Adhesive, Powder Coating, Gravure Ink, Lacquers

Compatible Polymers & Resins: Polyurethanes (PU)

Labeling Claims: Phthalates-free, Environmentally Friendly

Velsiflex® 342 is one of the most popular liquid plasticizers. It is a high-solvating plasticizer containing mostly dipropylene glycol dibenzoate. It is used in a wide variety of applications, including caulk, adhesives, resilient flooring, PVC-coated fabrics and artificial-leather cloth. In PVC, it acts as a medium- viscosity high solvator that saves energy and improves process ability. Vinyl applications using Velsiflex 342 have excellent resistance to extraction from solvents and oils. It also works with vinyl to make it UV – light-degradation resistant and stain resistant.

Polyaziridine Global Pze-1000 product card banner

PolyAziridine Global

PolyAziridine Global PZE-1000

Function: Crosslinking Agent

Chemical Family: Aziridines

End Uses: Waterborne Coating, Waterborne Adhesive, Waterborne Ink

Synonyms: Pentaerythritol tris(3-aziridin-1-ylpropionate)

PolyAziridine Global PZE-1000 is an ethylene imine based tri-functional polyaziridine that is used as a cross-linker for both aqueous and non-aqueous coatings, inks, and adhesives to promote both physical and chemical properties. With the highest level of functionality at 3.3, it yields the highest level of cross-link density of polyfunctional aziridines. The aziridine end groups can react with active hydrogen as found on carboxyl groups of acrylic emulsions or polyurethane dispersions. PZE-1000 also has a hydroxyl group, which allows it to dispersion readily into aqueous systems. PZE-1000 is added at levels of 1% to 3% to finished formulated coatings, inks, or adhesives. It is added slowly and under good agitation. After mixing, an aqueous system with a pH of 9.0-9.5 will typically have a pot life of 18-36 hours. This time will be reduced when the pH is lower.

Megum® 128 product card banner

DuPont

MEGUM® 128

Ready to Use Product Type: 2K (2 component) Adhesive, 1K (1 component) Adhesive

Compatible Substrates & Surfaces: Plastics, Polyesters, Elastomers & Rubbers, Metal, Polyamide

Application Method: Spray, Brush, Dip Coating

MEGUM® 128 is a general purpose cover coat adhesive used for bonding rubber compounds to metals and other rigid substrates during vulcanization. In rubber to metal bonding applications, MEGUM® 128 requires a MEGUM® or THIXON® primer. Other rigid substrates such as thermoplastics and other metal alloys may not require a primer. However, environmental resistances of the final application need to be considered._x005F MEGUM® 128 consists of reactive polymers and pigments in xylene. It is formulated without reportable levels of lead or other heavy metals._x005F MEGUM® or THIXON® primers adhere to hot and cold rolled steel, stainless steel, aluminum, brass and thermoplastics such as polyamides and polyesters._x005F MEGUM® 128 has well-balanced performance based on standard industry test specifications (ASTM D429-WDK2000)._x005F MEGUM® 128 has good boiling water, heat and pre-bake resistance._x005F MEGUM® 128 enables global standardization and consolidation. Based on the chemistry, MEGUM® 128 displays low mold fouling properties.

Betamate® Flex 100f product card banner

DuPont

BETAMATE® Flex 100F

Ready to Use Product Type: Structural Adhesive, 1K (1 component) Adhesive

Compatible Substrates & Surfaces: Aluminum, Metal, Steel, Magnesium, Galvanized Steel, Composites

Cure Method: Heat Cure

BETAMATE® Flex 100F is a one component, heat curing, elastic adhesive designed for body shop application. It is capable of bonding oily galvanized steel, cold rolled steel, aluminum, magnesium and CFRP.

Megum® 3276 product card banner

DuPont

MEGUM® 3276

Ready to Use Product Type: 1K (1 component) Adhesive, Primer

Application Method: Brush, Dip Coating, Spray

Compatible Substrates & Surfaces: Elastomers & Rubbers, Metal

MEGUM® 3276 is a vulcanizing adhesive primer used with MEGUM® or THIXON® cover coat adhesives for bonding most elastomers to various substrates._x005F MEGUM® 3276 is also used as a one-coat for bonding polar rubber compounds such as nitrile or polychloroprene to metal or other materials. Due to the unique chemical composition, this adhesive has shown extraordinary resistance to heat and hot water resistance under very demanding conditions. Either as a one-coat bonding polar rubber compounds or in conjunction with one of the fine THIXON® or MEGUM® cover coats it is a very durable primer adhesive.

Liveo™ Bio-psa 7-4602 product card banner

DuPont

Liveo™ BIO-PSA 7-4602

Ready to Use Product Type: Pressure Sensitive Adhesive

Chemical Family: Silicones

Features: Low Skin Sensitivity, Excellent Substrate Adhesion

Liveo™ BIO-PSA 7-4602 is a Standard pressure sensitive adhesive specifically designed for transdermal drug delivery systems. These adhesives are permeable to many drugs and excipients and are designed to adhere drug-loaded systems to the skin. Liveo™ BIO-PSA Standard Silicone Adhesives are produced through a condensation reaction of a silanol endblocked polydimethylsiloxane (PDMS) with a silicate resin.

Vycel U product card banner

Atmos Technologies

Vycel U

Chemical Name: Benzene, 1,4-Dimethyl-, Manuf. Of, By-Products From, C11-22-Distn. Residues

Function: Active Diluent, Rheology Modifier

CAS Number: 147952-37-2

Chemical Family: Hydrocarbons

Compatible Polymers & Resins: Polyurethanes (PU)

Vycel U is a low viscosity diluent of PU systems with excellent particle wetting. Excellent compatibility with Polyurethanes, Epoxy, Polyester and Phenolic resin systems.

Igi® 1250a product card banner

The International Group Inc

IGI® 1250A

Function: Occlusive

Certifications & Compliance: FDA Approved

IGI® 1250A is a fully refined paraffin wax.

Andisil® Oh 50,000 product card banner

AB Specialty Silicones

Andisil® OH 50,000

Function: Adhesion Promoter, Anti-Structuring Agent, Coupling Agent

Chemical Family: Silicones, Silicon-based Compounds

Labeling Claims: Plasticizer-free, Additive-free

Features: Good Stability, Excellent Stability

Andisil® OH 50,000 is a Silanol terminated fluid.Andisil® OH Polymers are a series of silanol functional fluids with various viscosities and silanol contents. They are useful in the treatment of fillers and as Anti-Structuring additives in high consistency silicone rubber and silicone Room Temperature Vulcanizing (RTV) formulations. The low viscosity grades can be used as reactive diluents for high viscosity polymers to adjust the overall viscosity of the formulation. They have excellent stability and can be used with catalytic amounts of ammonium carbonate to treat reinforcing fillers in-situ. Andisil® OH products are pure and do not contain any plasticizers or additives. Curing of the Andisil® OH series can be achieved by all usual condensation crosslinkers (i.e. Alkoxy silanes, oxime silanes, acetoxy silanes) in conjunction with catalysts—the use of dibutyl tin dilaurate or stannous octoate have been found effective as catalysts for these reaction.

Andisil® Vqm 2050 product card banner

AB Specialty Silicones

Andisil® VQM 2050

Function: Reinforcement

Chemical Family: Siloxanes, Vinyls, Vinylics & Vinyl Derivatives, Silicones

Features: Fast Curing, Good Mechanical Properties, Good Tear Strength, Excellent Dimensional Accuracy

End Uses: Dental Applications

Andisil® VQM Products are additives for the improvement of mechanical properties of addition cured silicone elastomers. The curing mechanism of vinyl-functional silicone polymers (Andisil® VS) is a platinum catalyzed addition reaction with silicone crosslinkers containing silicon-hydride groups. The mechanical properties of the unfilled RTV are rather poor. Therefore the properties are improved with the addition of appropriate fillers i. e. Carbon black, fumed or precipitated silica and other fillers well known to formulators with expertise in compounding silicones. Andisil® VQM Products are comprised of vinyl-functional silicone polymers and vinyl-functional QM-resins. The product group is beneficial in formulating filler free, transparent systems which require good mechanical properties. The products will also enhance improvement of mechanical properties of filled formulations.

Andisil® Tl 28 product card banner

AB Specialty Silicones

Andisil® TL 28

Chemical Name: Dimethylbis[(1-oxoneodecyl)oxy]stannane

Function: Stabilizer, Light Stabilizer, Catalyst, Heat Stabilizer

CAS Number: 68928-76-7

Chemical Family: Tin Compounds, Laureth Compounds

Compatible Polymers & Resins: Silicones, Phenolic Resins, Polyamides, Polyurethanes (PU)

Synonyms: Dimethyldineodecanoatetin, Dimethyltin Dineodecanoate

Andisil® TL 28 products are high activity liquid catalysts used in the condensation cure of silicones, and the synthesis of polyurethanes & esters.

Silyl® Sat115 product card banner

Kaneka North America LLC

SILYL® SAT115

Chemical Family: Polyethers

KANEKA SILYL® SAT115 is a Silyl-Terminated Polyether (STPE) used as a base resin or with other KANEKA MS Polymer® as reactive diluent for producing high performance moisture cure sealants, adhesives, and coatings. SILYL SAT115™ has performed successfully in various industrial applications and provides well-balanced properties such as durability, reactivity, and storage stability. This unique and highly valued balance of attributes is derived from the polyether polymer backbone coupled with the methyldimethoxysilane functional groups.

Silyl® Sax530 product card banner

Kaneka North America LLC

SILYL® SAX530

Chemical Family: Polyethers

KANEKA SILYL® SAX530 is a Silyl-Terminated Polyether (STPE) used as a base resin for producing high performance moisture cure sealants, adhesives, and coatings. SILYL SAX530™ has performed successfully in various industrial applications and provides well-balanced properties such as durability, reactivity, and storage stability. This unique and highly valued balance of attributes is derived from the polyether polymer backbone coupled with the trimethoxysilane functional groups.

Ebecryl® 741 product card banner

allnex

EBECRYL® 741

Function: Adhesion Promoter, Oligomer, Coupling Agent

Chemical Family: Acrylics & Acrylates

Labeling Claims: VOC-free, Bisphenol A-free, Solvent-free, Low Carbon Footprint

EBECRYL® 741 is an adhesion-promoting resin with excellent pigment dispersion properties for radiation curable screen inks.

Igi® 1260a product card banner

The International Group Inc

IGI® 1260A

Function: Occlusive

Certifications & Compliance: FDA Approved

IGI® 1260A is a fully refined paraffin wax.

Kuraray Poval™ 44-88 product card banner

Kuraray

Kuraray Poval™ 44-88

Polymer Name: Polyvinyl Alcohol (PVOH)

Function: Coupling Agent, Binder, Adhesion Promoter

Chemical Family: Vinyls, Vinylics & Vinyl Derivatives, Polyvinyl Alcohols & Esters

KURARAY POVAL™ 44-88 (formerly KURARAY POVAL™ PVA-224) by Kuraray is a polyvinyl alcohol (PVOH) compound. It is a biodegradable, recyclable and water-soluble grade. It offers good bonding strength and pigment binding capacity. It exhibits excellent film-forming characteristics, high tensile strength and elasticity. It shows resistance against organic solvents and dispersing power. KURARAY POVAL™ 44-88 is used in water-based pressure-sensitive labels and remoistenable adhesives. It is designed for paper processing industry and films.

Kuraray Poval™ 32-88 product card banner

Kuraray

Kuraray Poval™ 32-88

Polymer Name: Polyvinyl Alcohol (PVOH)

Function: Coupling Agent, Binder, Adhesion Promoter

Chemical Family: Vinyls, Vinylics & Vinyl Derivatives, Polyvinyl Alcohols & Esters

KURARAY POVAL™ 32-88 is a partially saponified polyvinyl alcohol (PVOH) grade by Kuraray. It possesses good cohesion and adhesion to fibers, fillers and pigments. It offers good bonding strength and pigment binding capacity. It is suitable for modification of emulsion adhesives and remoistenable adhesives in the paper processing industry. Aqueous solution of KURARAY POVAL™ 32-88 can be added to polymer emulsion which is already stabilized with polyvinyl alcohol to extend the open time, increase setting speed and influence the rheology. It is recommended for use in postage stamps and labels. Complies with EU Directive 67/548/EC regulation.

Kuraray Poval™ 4-88 La product card banner

Kuraray

Kuraray Poval™ 4-88 LA

Function: Binder, Adhesion Promoter, Coupling Agent

Chemical Family: Vinyls, Vinylics & Vinyl Derivatives

KURARAY POVAL™ 4-88 LA by Kuraray is a water-soluble, polyvinyl alcohol (PVOH) grade manufactured by alcoholysis of polyvinyl acetate. It exhibits high molecular weight, good cohesion and low ash (sodium acetate) content. It shows good adhesion to fibers-, fillers- and pigments. KURARAY POVAL™ 4-88 LA is recommended for adhesive for flooring webs, PSA labels and in remoistenable adhesives which are employed mainly in the paper processing industry, films applications.

Tough-seal 21 A product card banner

Key Polymer

Tough-Seal 21 A

Chemical Family: Epoxy & Epoxy Derivatives

Ready to Use Product Type: Encapsulant, 2K (2 component) Sealant, Potting Compound, Epoxy Sealant, Structural Sealant

Application Areas: Electrical Components

Compatible Substrates & Surfaces: Plastics, Metal, Aluminum

Tough-Seal 21 A is a tough and durable two component, fast gelling, hybrid epoxy elastomer electrical potting compound with excellent thermal cycling performance. KEY Tough-Sealhas the flexibility of a urethane and the service temperature of an epoxy.

Hordaresin Np-70 product card banner

Dover Chemical

Hordaresin NP-70

Function: Water Repellent, Flame Retardant

Chemical Family: Alkanes, Chlorinated, Chlorinated Compounds

Compatible Polymers & Resins: Polyolefins, Alkyds

Features: Chemical Resistance, Improves Adhesion, Water Resistance

Hordaresin NP-70 is a solid, 70% chlorinated alkane which is used in a variety of applications including paints, coatings, rubber, adhesives, polyolefins, textiles & fabrics. Hordaresin NP-70 is used primarily as a flame retardant and shows excellent synergies with antimony trioxide. Additionally, ancillary improvements in various grades of rubber have been seen with improvements in both tensile and tear properties. In polyolefins, Hordaresin NP-70 is generally recommended for use in standard grades of low-density polyethylene. In mineral filled polypropylene composites, Hordaresin NP-70 has been used as a coupling agent.

Silquest™ A-186 product card banner

Momentive Performance Materials

Silquest™ A-186

Function: Coupling Agent, Adhesion Promoter

Chemical Family: Epoxy & Epoxy Derivatives, Silanes

End Uses: Waterborne Sealant, Waterborne Adhesive, Waterborne Coating

Compatible Polymers & Resins: Silicones, Polyurethanes (PU), Polysulfide Rubber, Epoxies (EP), Acrylics

Features: Improved Flexibility, Excellent Adhesion

Silquest™ A-186 silane adhesion promoter, can result in better electrical and/or mechanical properties in a variety of applications and industries. From enhancing electronic encapsulants to enabling improved sealant formulations, Silquest™ A-186 silane provides both epoxy and silane functionalities that promote adhesion in a range of formulations, including SPUR+ prepolymer, urethane, epoxy, silicone, and acrylic caulks, coatings, sealants and adhesives.

Pantint® 12r1659 product card banner

Pan Technology Inc.

PanTINT® 12R1659

Color: Red

Pigment Type: Inorganic Pigments

Chemical Family: Iron & Iron Compounds, Iron Oxides

End Uses: Radiation Curable Coating, Lacquers, Radiation Curable Ink, 2K (2 component) Coating, Gravure Ink, Solventborne Coating, Solventborne Ink, Digital Ink, 1K (1 component) Coating

Compatible Polymers & Resins: Acrylics, Epoxies (EP), Polyesters, Cellulose & Cellulosics, Chlorinated Rubbers, Polyureas, Alkyds, Polyurethanes (PU)

Carrier: Solvent-based

Solvent-free chip dispersions for use in solvent borne and radiation cured coatings and inks. PanTINT 12 Colorants are based on a unique modified thermoplastic acrylic resin with exceptionally broad compatibility. Pigments used in the PanTINT 12 Series have been selected to meet the durability and transparency requirements of most high performance applications.

Silquest™ A-171 product card banner

Momentive Performance Materials

Silquest™ A-171

Function: Coupling Agent, Crosslinking Agent, Moisture Scavenger, Adhesion Promoter

Chemical Family: Silanes

Compatible Polymers & Resins: Acrylics

Molecular Weight: 148.2 - 148.2 g/mol

Features: Chemical Resistance

Silquest™ A-171 silane offers vinyl and silane functionality and also can be utilized for chain extension of RTV silicones or OH functional polymers. This results in Si-O-Si crosslink sites that are highly resistant to the effects of exposure to moisture, chemicals and UV rays. As a siloxane crosslinker, Silquest™ A-171 silane typically does not generate color and is resistant to acid rain under most conditions. This silane is also useful as a moisture scavenger in moisture cure systems where improved shelf life is desired.