Rubber Adhesives and Sealants Specifications

Help with Rubber Adhesives and Sealants specifications:

Compound Type

	Function
	Your choices are...
	Caulk / Grout		Caulks, grouts, and joint compounds have a sufficiently low viscosity that allows them to be pumped into joints or cracks for sealing or repair. Caulk typically consists of a flexible material. Grouts are usually based on thin-set inorganic mortars. Polymer or resin binder-based grouts are also available.
	Encapsulating / Potting		Encapsulates and potting compounds are resins used to encapsulate circuit boards or semiconductor devices, fill a container of electronic devices, or infiltrate electrical coils to provide environmental protection and electrical insulation. Ceramic cement-based potting compounds are available for high-temperature applications.
	Leveling / Filling Compound		Leveling compounds, gap fillers, chocking materials, and mastics are highly viscous materials that are applied by trowel to give thick glue lines, usually with gap-sealing properties. Chocks, chocking, and floor-leveling compounds are used during the installation of heavy equipment or machine bases. Chocking or leveling compounds allow machines to be installed level or plumb, and can be used in place of metal or plastic shims or shim stock. Mastics are used to fill gaps or irregularities in a surface before tile or other materials are applied. Mastics are also used to bond tiles to sub-flooring. Repair compounds or gap fillers are used to fill gaps or repair cavities or holes in a part, casting, or structure.  Typically, these compounds may also be used as adhesives or sealants, or have sealing or bonding characteristics.
	Thermal Compound / Heat Conductive		Materials are designed to form a thermally conductive layer on the substrate, between components, or within a finished electronic product. Thermally conductive resins, thermoplastics, encapsulates, potting compounds, tapes, pads, adhesives and greases are often used between a heat-generating electrical device and a heat sink to improve heat dissipation.
	Thread Locker / Retainer		Threadlocking or threadlocker adhesives bind threads that are subject to transverse and axial loads against vibrational loosening. They reduce production costs and improve reliability by eliminating lock washers and other expensive locking devices. Threadlockers also preserve on-torque and distribute the load over the entire engagement length of a fastener, effectively eliminating premature material fatigue and fastener failure.
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Electrical & Optical Properties

	Dielectric Strength		Dielectric strength is the maximum voltage field that the material can withstand before electrical breakdown occurs.
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	Dielectric Constant (Relative Permittivity)		The dielectric constant is the relative permittivity of a material compared to a vacuum or free space.  As an equation, it is expressed as k = εr = ε / εo= where ε is the absolute permittivity of the material and εo is the absolute permittivity of a vacuum 8.85 x 10-12 F/m.
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	Index of Refraction		The index of refraction is a measure of the speed of light in a material.
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	Transmission		This is the amount of light transmitted through a material.
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Substrate / Material Compatibility

	Your choices are...
	Ceramic / Glass		Ceramics consist of oxides, carbides, nitrides, and other non-metals with high melting points. Ceramics are suitable for applications requiring wear resistance, thermal stability, and electrical resistivity.
	Concrete / Masonry		Concrete and cements consist of a mixture of a binder or clinker and a coarser aggregate. They are used to patch or line floors and walls, bond brick, and join components for use in high-temperature applications. Clinker is a fused mineral or mineral mixture, such as alumina, bauxite, or lime, which is crushed into a fine powder. Aggregates are coarser, granular materials that are added to mortar, grout, or cement at mixing time to impart special properties such as thermal stability, wear resistance and oxidation resistance. Synthetic aggregates are fused mineral or mineral mixtures crushed to a coarse, granular size range rather than a fine, powdered clinker. Portland cement is the most common bond used in structural concretes and mortars. Polymer cements have a resin bond and are used in corrosion protection, mortars for corrosion-resistant floor tiles, and other specialized industrial applications. Masonry consists of tile, bricks, stone, or other ceramic components that are bonded together with mortar or adhesive.
	Composites		Composite materials consist of a resin (suitable for molding) and a matrix (typically fibers or textile material) which serves to enhance strength, alter electrical or magnetic properties, or enhance wear resistance.
	Metal		Metals are opaque, fusible, ductile, and typically lustrous substances that are good conductors of heat and electricity. They form cations by the loss of electrons and yield basic oxides and hydroxides. Metals that are used in structural engineering applications have a high toughness that is a combination of high strength and ductility.
	Paper / Paperboard		Paper or paperboard products are produced from a pulp of cellulose, cotton, wood, or other vegetable fibers. The pulp is laid down on a fine screen from a water suspension to form sheets that are dried and further processed.
	Plastic		Plastics are organic, synthetic, or processed materials that are mostly thermoplastic or thermosetting polymers of high molecular weight. They can be made into objects, films, or filaments.
	Porous Surfaces		Substances are adhesives or sealants with a high viscosity or gel-like consistency. Typically, these materials have the ability to work with porous surfaces.
	Rubber / Elastomer		Rubber and elastomers are characterized by a high degree of flexibility and elasticity (high reversible elongation). Natural or synthetic rubber is vulcanized to increase useful properties such as toughness and resistance to wear for use in tires, electrical insulation, and waterproof materials.  Vulcanization is a chemical treatment that adds sulfur and heat to crosslink the rubber. Natural rubber is an elastic substance that is obtained by coagulating the milky juice of any of various tropical plants. Essentially, natural rubber is a polymer of isoprene, and is prepared as sheets and then dried.  Synthetic rubbers or elastomers can be based on a variety of systems such as silicone, polyurethane or neoprene.
	Textiles / Fabrics		Substances are adhesives or sealants suitable for coating, filling, sizing, or sealing non-woven or woven textiles. Sizing adhesives or resins are used to fill paper, textile webs, and other fibrous products.
	Wood / Wood Product		Wood is a natural composite extracted from the stems, branches, and roots of trees. It is a hard, fibrous substance that consists of xylem, cellulose fibers in an amorphous, lignin polymer matrix. Lignin is a biogenetic cross linked polymer which bonds together adjacent cell walls into a straw or wood tissue composite. Cellulose is a polysaccharide (C6H10O5)x of glucose units that constitutes the chief part of the cell walls of plants. It occurs naturally in fibrous products such as cotton and kapok, and is the raw material of many manufactured goods as paper, rayon, and cellophane.
	Other		Other unlisted, specialty, or proprietary substrates.
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	Dissimilar Substrates?		Adhesive or sealant systems can bond dissimilar substrates, such as metal to rubber.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

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Industry / Applications

	Industry:
	Your choices are...
	Aerospace		Products are designed for aerospace applications. For example, they can be used to bond composite structures to other composite or metallic frame components.
	Automotive		Products are designed for automotive applications. For example, they can be used to bond panels and seal windows.
	Electronics		Products are designed for use in electronics applications. For example, they can be used in potting or encapsulating compounds, conductive adhesives, and dielectric sealants.
	Electrical Power / HV		Products are resins, compounds, and plastic composites that are suitable for electrical power or high voltage (HV) applications such as generator or motor assemblies, coil or transformer manufacturing, and switch or circuit breaker insulation.
	Marine		Products are designed for marine applications. They can be immersed in water and can withstand exposure to marine atmospheres.
	Medical / Food (Sanitary / FDA)		Products are suitable for medical or food-contact applications. Typically, they they comply with requirements from regulatory agencies such as the Food and Drug Administration (FDA), U.S. Department of Agriculture (USDA), National Science Foundation (NSF), 3A-Dairy, Canada AG, or USP Class VI.
	Military / Government (MIL-SPEC / GG)		Products adhere to U.S. military specifications (MIL-SPEC).
	OEM / Industrial		Products are designed for use by original equipment manufacturers (OEMs) for the assembly, sealing, or fabrication of products.
	Optical Grade / Material		Polymers or elastomers are designed for optical or photonics applications. Examples include transparent polycarbonate or acrylic lens materials.
	Photonics / Optoelectronics		Products are designed for optoelectronics or photonics applications. Examples include cements for bonding simple lenses into compound structures.
	Semiconductors / IC Packaging		Products are designed or are suitable for semiconductor or semiconductor packaging applications.
	Building / Construction		Products are designed for use by construction contractors and in maintenance, repair, and operation (MRO) applications. Construction materials include wood, wood products, glass, cement products (mortar, concrete, masonry), plaster board, metal trim, flooring tile, sub-floor or underlayment, plaster board, sheet metal roofing or flash, metal ties, insulation materials (fiberglass, foam), and bitumen-based roofing materials.
	Tooling / Mold Material		Products are designed for tooling or mold fabrication such as polyurethane shapes or castable silicones.
	Other		Other unlisted industries.
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Cure Type / Technology

	Cure Type / Technology
	Your choices are...
	Air Setting / Film Drying		Air setting or film drying materials form a bond or "harden" by evaporating water or an organic solvent. Inorganic binders or cements are sometimes air setting. Refractory-type products may develop strong bonds after firing. Many pastes and gum adhesives are film-drying.
	Anaerobic		Anaerobic adhesives cure in the absence of air or oxygen.
	Contact / Pressure Sensitive (PSA)		Pressure sensitive adhesives (PSA) adhere to most surfaces with very slight pressure and retain their tackiness. PSAs are available in solvent and latex or water-based forms. Pressure sensitive adhesives are often based on non-crosslinked rubber adhesives, acrylics or polyurethanes. They form viscoelastic bonds that are aggressively and permanently tacky, and adhere without the need of more than finger or hand pressure.
	Thermosetting / Crosslinking		Thermoset plastics and thermoset resins are crosslinked polymeric resins that are cured using heat or heat and pressure. Cured thermoset resins generally have higher resistance to heat than thermoplastics, but cannot be melted down and reprocessed. Thermoset adhesives are crosslinked polymeric resins cured using heat or heat and pressure. Cured thermoset resins do not melt and flow when heated, but they may soften. Phenolic, melamine, and urea formaldehyde resins are thermosetting adhesives that offer strong bonds and good resistance to high temperatures.  Vulcanization is a thermosetting reaction involving the use of heat and/or pressure in conjunction with a vulcanizing agent, resulting in greatly increased strength, stability and elasticity in rubber-like materials. RTV silicone rubbers are room temperature vulcanizing materials. The vulcanizing agent is a crosslinking compound or catalyst. Sulfur is the traditional vulcanizing agent used with natural rubber. Silicones use moisture, acetic acid and other compounds as curing agents.
	Room Temperature Curing		Room temperature curing or vulcanizing products are polymer resins or compounds that either cure or vulcanize at room temperature. Vulcanization is a thermosetting reaction involving the use of heat and/or pressure in conjunction with a vulcanizing agent. It results in greatly increased strength, stability, and elasticity in rubber-like materials. The vulcanizing agent is a crosslinking compound or catalyst. Silicones use moisture, acetic acid, and other compounds as curing or vulcanizing agents.
	Reactive / Moisture Cured		Reactive resins are single-component adhesives that are applied in the same way as hot-melt adhesives. The resins react with moisture to crosslink and polymerize, thus resulting in a cured material. Polyurethane reactives (PUR) are examples of this type of technology. Certain silicones and cyanoacrylates also use a reaction with moisture or water to cure the adhesive or sealant.
	Thermoplastic / Hot Melt		Thermoplastics can be repeatedly softened by heat and then hardened, or set by cooling, which allows parts to be injection-molded or thermoformed and scrap to be reprocessed. Thermoplastic or hot melt adhesives can be repeatedly softened by heat and then hardened, or set by cooling, which allows parts to be removed or repositioned during assembly. Most hot melt adhesives are solvent-free thermoplastics that melt or drop in viscosity above 180°F, and then rapidly set upon cooling. They are used in a variety of manufacturing processes, including bookbinding, woodworking, construction, product assembly, and box and carton heat sealing.  Hot melt adhesive technology stemmed from the previous use of molten wax for bonding. Thermoplastic systems were introduced to satisfy performance needs. Typically, a pure hot melt system will not have the heat resistance of two-part, catalyst, or thermoset adhesives. Hybrid hot melt systems are available that exhibit a degree of reactive curing.  Polyethylenes, polyamides and ethylene-vinyl acetates are common types of hot melt adhesives. Heat activated adhesives become sticky or tacky when warmed, and are used in contact or PSA-type applications.
	UV / Radiation Cured (also EB, Light)		UV or radiation cured adhesives use ultraviolet light, visible light, or electron beam (EB) irradiation to initiate curing, which forms a permanent bond without heating or excessive heat generation. One disadvantage of UV curing adhesives is the requirement that one substrate is UV transparent. Some UV resin systems employ a secondary curing mechanism to complete curing of adhesive regions shielded from the UV light. EB curable adhesives use electron beam radiation to cure or initiate curing.  The electron beam can penetrate through material that is opaque to UV light.
	Two Component System		Two or multi-component adhesive or sealant systems consist of two or more resins or a resin and a hardener, crosslinker, activator, or catalyst that, when combined, react and cure into a polymerized compound or bond. Two component systems are mixed and then applied.
	Single Component System		Single component adhesives or sealant systems consist of one resin that hardens by reaction with surface moisture, a surface applied activator-primer, or through the application of heat.
	Specialty / Other		Other unlisted, specialty, proprietary technologies or cure types.
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Material System

	Chemical / Polymer System Type
	Your choices are...
	Acrylic / Polyacrylate		Acrylics feature excellent environmental resistance and fast-setting times. Acrylic polymers are produced from acrylic acids via a catalytic reaction.
	Polysulfide		Polymer resins or compounds are based on polysulfide or polyphenylene sulfide (PPS) chemical systems.
	Silicone		Plastic compounds, elastomer resins, or polymers are based on the silicone chemical system. Silicones are produced through the hydrolysis and polymerization of silanes and siloxanes.
	Polyurethane (PU, PUR)		Polyurethane (PUR) resins provide excellent flexibility, impact resistance, and durability. Polyurethanes are formed through the reaction of an isocyanate component with polyols or other active hydroxyl group compounds. PUR resins require a catalyst, heat, or air evaporation to initiate and complete curing.
	Vinyl (PVC)		Polymers are based on the vinyl chemical system. Examples include polyvinyl chloride (PVC), polyvinylidene chloride (PVDF), polyvinyl vinyl acetate (PVA), and polyvinyl alcohol (PVOH).
	Specialty / Other		Other specialty, proprietary, or unlisted resins, chemical systems or compound or polymer types.
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Features

	Features
	Your choices are...
	Anti-static / ESD Control		Anti-static materials have relatively high electrical conductivity or low electrical resistivity. They are used in electronic, anti-static, or electrostatic discharge (ESD) applications.
	Electrically Conductive		Resins or compounds with a high degree of electrical conductivity (low resistivity) are used in applications such as anti-static or ESD control, EMI/RFI shielding, thick-film metallization, and device and board-level electrical interconnection.
	Electrical Insulation / Dielectric Material		Dielectric compounds and electrical insulation materials form a barrier or isolator between electrical or electronic components. The voltage potential between the conductor and conductive components influence material selection, based on the dielectric strength to reduce shorting. Dielectric constant and loss tangent are important parameters in minimizing crosstalk between insulated circuit paths.
	EMI / RFI Shielding Material		Polymers or elastomers are designed to provide shielding from electromagnetic interference (EMI) or radio frequency interference (RFI). Typically, these compounds have a high degree of electrical conductivity.
	Filled		Filled compounds consist of adhesives with additional modifiers such as pigments or chopped fiber reinforcements. Typically, filled compounds are ready-to-use.
	Flame Retardant (e.g. UL 94 Rated)		The material is flame retardant in accordance with industry standards from Underwriters Laboratories, Inc. (UL), Flame Class 94, or other ISO standards. Flame-retardant materials are designed to reduce the spread of flame or resist ignition when exposed to high temperatures. They also insulate the substrate and delay damage to it.
	Flexible / Dampening		Products are designed to provide flexibility or dampening of sound, vibration, or shock in suitable applications. Flexible adhesives or sealants form a layer that can bend or flex without cracking or delaminating.
	Laminating / Composites		Products are designed for constructing laminating strip structures or SCRIMP matrix resins for composite construction. SCRIMP is an acronym for Seeman composites resin infusion molding process.
	Non-corrosive Cure		Silicone or reactive systems use a non-corrosive cure system such as a metal or oxime catalyst.
	Phase Change		Thermal interface materials use a phase change to enhance thermal characteristics or heat absorption from electronic devices or electrical components.
	Solvent Based (Volatile Organic)		Solvent-based adhesive resins use a volatile organic solvent (VOC) to thin or alter viscosity. Typically, solvent-based adhesive resins result in greater environmental or regulatory control problems. Solvents can also present a fire hazard or a risk of explosion, depending on the plant or job site.
	Thermal Insulation / Heat Insulating		Thermally insulating resins, plastics, compounds and encapsulates provide a thermal barrier between components and a hot or cold source.
	UL Approved		The material is approved to or recognized under one or more requirements of Underwriters Laboratories, Inc. (UL).
	Water Based / Latex Dispersion		Water-based or water-borne adhesive resins are water soluble or water emulsion-based resin systems that typically do not contain any VOC solvents. Water-based adhesive resins usually present fewer environmental or regulatory control problems.
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Processing & Physical Properties

	Applied Thickness / Gap Fill		Products are applied at a particular functional surface thickness  or between two surfaces (the 'gap fill' thickness) to ensure performance criteria, such as strength, electrical resistance, etc., are met.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Viscosity		Viscosity is a measurement of a fluid's resistance to flow. Water is lower in viscosity than motor oil or honey. Oil is lower in viscosity than tar or molasses. Depending on the application method, viscosity determines how well a resin fills the cavities or voids in a mold.
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Thermal Properties

	Use Temperature		Use temperature is the range of temperatures a product can be exposed to without the degradation of structural or other required end-use properties.
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	Thermal Conductivity		Thermal conductivity is the linear heat transfer per unit area through a material for a given applied temperature gradient. Heat flux (h) = [thermal conductivity (k) ] x [temperature gradient (Δ T)]
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Coeff. of Thermal Expansion (CTE)		Coefficient of linear expansion (CFE) is the amount of linear expansion or shrinkage that occurs in a material with a change in temperature.
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Mechanical Properties

	Tensile Strength (Break)		Tensile strength at break is the maximum amount of stress required to break the material under tension-loading test conditions, or to cause failure. Typically, tensile tests are performed according to test procedure standards such as ASTM D-638 or ISO 527-1, ASTM D-1708, ASTM D-2289 (plastics at high strain rates), and ASTM D-882 (thin plastic sheets), as well as other OEM proprietary standards.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Elongation		Elongation is the amount of deformation as a percentage that occurs during a tensile test or other mechanical test.
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