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A test, or series of tests, conducted by the procuring agency, or an agent
thereof, upon receipt to determine whether an individual lot of materials
conforms to the purchase order or contract or to determine the degree of
uniformity of the material supplied by the vendor or both.
A substance designed to accelerate or enhance the adhesive's curing
A two-component structural adhesive capable of bonding to a large variety
of materials. Cyabond® acrylic adhesives are known for excellent
environmental resistance and fast-setting time.
Acrylonitrile Butadiene Styrene Resin (ABS)
A commonly found plastic offering good resistance to both high and low
temperatures and impact. It bonds well with many adhesive types.
A substance, which initiates or accelerates the cure of an adhesive.
To cause two surfaces to be held together by adhesion.
A body, which is held to another body by an adhesive. (See also substrate)
The state in which two substrates are held together by interfacial forces
which may consist of valence forces or interlocking action, or both.
Adhesion between surfaces in which the adhesive holds the parts together
by interlocking action.
Adhesion between surfaces which are held together by valence forces of the
same type as those which give rise to cohesion.
A substance capable of holding materials together by surface attachment.
A two phase system in which one phase is suspended in a liquid.
An adhesive that can be used for bonding parts together, such as in the
manufacture of a boat, airplane, furniture, and the like.
An adhesive that sets at temperatures below 20°C (68°F).
An adhesive that is apparently dry to the touch and which will adhere to
itself instantaneously upon contact; also called contact bond adhesive or
dry bond adhesive.
Adhesive, Heat Activated
An adhesive, the apparent density of which has been decreased
substantially by the presence of numerous gaseous cells dispersed
throughout its mass.
Adhesive, Hot Melt
An adhesive that is applied in a molten state and forms a bond on cooling
to a solid state.
Adhesive, Hot Melt
A dry adhesive film that is rendered tacky or fluid by application of heat
or heat pressure to the assembly.
An adhesive that requires a temperature at or above 100°C (212°F) to set
Adhesive, Multiple Layer
A fil adhesive, usually supported, with a different adhesive composition
on each side; designed to bond dissimiliar materials such as the core to
face bond of a sandwich composite.
A viscoelastic material which in solvent-free form remains permanatly
tacky. Such material will adhere instantaneously to most solid
surfaces with the application of very slight pressure.
Adhesive, Room Temp. Setting
An adhesive that sets in the temperature range from 20 to 30°C (68 to 86°F),
in accordance with the limits of Standard Room Temperature specified in
ASTM Methods D 618, Conditioning Plastics and Electrical Insulating
Materials for Testing.
Adhesive, Separate Application
A term used to describe an adhesive consisting of two parts, one part
being applied to one adherend and the other part to the other adherend and
the two brought together to form a joint.
An adhesive having a volatile organic liquid as a vehicle.
Adhesive, Solvent Activated
A dry adhesive film that is rendered tacky just prior to use by
application of a solvent.
The temperature in the surrounding area.
Anaerobic adhesives cure in the absence of air and the presence of active
Relating to or made with water.
A group of materials or parts, including adhesive, which has been placed
together for bonding or which has been bonded together.
The time interval between the spreading of the adhesive on the adherend
and the application of pressure or heat, or both, to the assembly.
A steam sterilization process under pressure at 115-134°C.
Aggressive to many plastics and adhesives but can be tolerated by Cyabond®'s Single Part
The manufactured unit or a blend of two or more units of the same
formulation and processing.
A component of an adhesive composition that is primarily responsible for
the adhesive forces which hold two bodies together.
An elevation of the surface of an adherend, somewhat resembling in shape a
blister on the human skin; its boundaries may be indefinitely outlined and
it may have burst and become flattened. A blister may be caused by
insufficient adhesive; inadequate curing time, temperature or pressure; or
trapped air, water, or solvent vapor.
The union of materials by adhesives. To unite materials by means of an
The layer of adhesive, which attaches two adherends.
The unit load applied in tension, compression, flexure, peel, impact,
cleavage, or shear, required to break an adhesive assembly with failure
occurring in or near the plane of the bond.
An intermediate stage in the reaction of certain thermosetting resins in
which the material softens when heated and swells when in contact with
certain liquids, but may not entirely fuse or dissolve. The resin in
an uncured thermosetting adhesive is usually in this stage.
Sometimes referred to as Resitol.
A rigid container in which adhesives in pre-measured quantities are
supplied. Cartridges can be either side-by-side (EDS) or a single tube. A
dispensing gun is required.
A substance that markedly speeds up the cure of an adhesive when added in
minor quantity as compared to the amounts of the primary reactants.
Viscosity measurement where water is 1 cP (also see mPas)
One where parts share the same axis.
Coefficient of thermal Expansion
The measured expansion of a product under heat measured per 1°C rise or
fall in temperature.
The state in which, the particles of a single substance are held together
by primary or secondary valence forces. As used in the adhesive
field, the state in which the particles of the adhesive (or the adherend)
are held together.
A bonding operation in which an assembly is subjected to pressure without
the application of heat.
Some adhesives should be stored in refrigerators or freezers. This
is normally, specified by the manufacturer.
A substrate made up normally of two or more materials combined to obtain a
synergistic effect. In some cases it may be comprised of combinations of
one material aligned to achieve optimum properties for example plywood.
The resistance to rupture under inward pressure. Adhesives generally
perform well under compression.
A chemical reaction in which two or more molecules combine with the
separation of water or some other simple substance. If a polymer is
formed, the process is called polycondensation.
A substance used to prepare a surface/substrate prior to bonding.
That property of a liquid adhesive by virtue of which it tends to resist
deformation. Consistency is not a fundamental property but is
comprised of viscosity, plasticity, and other phenomena.
Fine cracks that may extend in a network on or under the surface of or
through a layer of adhesive.
The dimensional change with time of a material under load, following the
initial instantaneous elastic or rapid deformation. Creep at room
temperature is sometimes called Cold Flow.
The chemical combining of monomers, oligomers and/or polymers to enhance
their properties which also renders them insoluble.
Very low temperatures - usually below 115°Kelvin - almost all Cyabond® products are not suitable for this
To change the physical properties of an adhesive by chemical reaction,
which may be condensation, polymerization, or vulcanization; usually
accomplished by the action of heat and catalyst, alone or in combination,
with or without pressure.
The temperature to which an adhesive or an assembly is subjected to cure
The period of time during which an assembly is subjected to heat or
pressure, or both, to cure the adhesive.
Cyanoacrylate adhesives are adhesives whose cure process is initiated with
A biocompatibility test performed as an extract or overlay on tissue
The property of a material to dissipate energy.
Reactions which take place in closed containers of light curable
formulations - usually premature polymerization.
The separation of layers in a laminate because of failure of the adhesive,
either in the adhesive itself or at the interface between the adhesive and
A measurement of the maximum voltage the adhesive can withstand before
electrical insulation breaks down.
A fluid whose viscosity increases with increased shear rate.
An ingredient, usually added to an adhesive to reduce the concentration of
the bonding materials.
The un-doing of a joint, either by force, soaking in solvent or applying
excess heat to soften the adhesive before breaking the bond.
A tube made from plastic, which connects to the end of the cartridge to
enable dispensing of adhesive fully mixed direct onto part to be bonded.
The specific wavelengths emitted from an ultraviolet lamp are mainly
dependent upon the fill. Using mercury as the norm, the spectral
output can be changed by the addition of dopants such as beryllium or iron.
A material property that allows deformation (bending, stretching, twisting)
A device used to determine the hardness of a material.
A macromolecular material which, at room temperature, is capable of
recovering substantially in size and shape after removal of a deforming
The entire range of wavelengths of electromagnetic radiation, extending
from gamma rays to the longest radio waves and including microwave,
ultraviolet, visible and infrared.
Electron Beam Sterilization
Special treatment, which destroys any organisms or microbes through a
destruction of their vital molecules through an indirect chemical reaction.
Similar to gamma irradiation.
Process to completely envelop an object in adhesive, which is normally
used to protect sensitive items.
A chemical reaction which absorbs heat.
Epoxy – 1 Part
Single part adhesive, which cures at elevated temperatures. Excellent
durability but limited to whether the substrates can take the heat
necessary to cure the adhesive.
Epoxy – 2 Part
A two part adhesive, which cures at room temperature. Very versatile,
used for many applications from fast repairs through to structural bonding.
EtO (ethylene oxide) Sterilization
Uses a toxic gas under very controlled environment. This is a
regulated process usually used by medical device manufacturers for
A chemical reaction which gives off heat.
A compound or adhesive with resistance to burning.
Rupture of an adhesive bond, such that the separation appears to be at the
adhesive adherend interface. Sometimes termed failure in adhesion.
Rupture of an adhesive bond, such that the separation appears to be within
A situation where one or other of the substrates is damaged but the actual
adhesive joint remains intact.
An adhesive, which incorporates solid particles to change its properties -
i.e. electrical conductivity or to increase the gap-filling capability.
A relatively nonadhesive substance added to an adhesive to improve its
working properties, permanence, strength, or other qualities.
That portion of an adhesive, which fills the corner or angle formed where
two adherends are joined.
The temperature in degrees °F (°C) at which a liquid gives off
sufficient vapor to form a flammable or ignitable mixture with air.
Movement of an adhesive during the bonding process, before the adhesive is
The distance from a lamp assembly at which the peak energy can be obtained.
A reactive species having an unpaired electron, which initiates a reaction
with a double bond, e.g., acrylic polymerization. It is produced
from its stable paired state by energy absorption.
Free Radical Reaction
A chemical reaction, which takes place only when a free radical or
molecule, which has lost one electron is generated.
Fiber Reinforced Plastic (see also GRP)
When the adhesive has reached its full strength - in contrast to its
A semisolid system consisting of a network of solid aggregates in which
liquid is held.
A description of an adhesive as it hardens from liquid to solid.
Term to describe the viscosity of an adhesive which is gelling.
The amount of time it takes for an adhesive to reach a gel cure state.
Glass Transition Temperature (Tg)
The temperature where the material changes from a flexible condition to
quite hard and brittle condition or vice versa.
The layer of adhesive which is between the two substrates.
Glass Reinforced Plastic (see also FRP)
The time after which a bonded unit may be moved to continue the assembly
process, but no significant loads should be exerted on the bond line.
A substance or mixture of substances added to an adhesive to promote or
control the curing reaction taking part in it. The term is also used
to designate a substance added to control the degree of hardness of the
When related to a fully cured adhesive, the Shore method is adapted.
Usually adhesives are categorized as Shore D (being hard) and Shore A for
more rubbery materials.
Hardness (durometer) gained or lost by a material after exposure to a
High density polyethylene - tough waxy material with good chemical
resistance, may be bonded but needs special surface treatment.
To effect the change from liquid to solid for an adhesive which has to be
heated - usually anywhere between 30 - 180°C.
Materials which have a tendency to absorb moisture from the atmosphere.
The measurement of a material’s ability to withstand shock loading.
The process of imbedding a liquid into a porous solid to change its
Cures the adhesive by heating one of the ferrous metal substrates using
induction. Very rapid setting times can be achieved.
Photon energy having wavelengths between 1 and 100 microns.
A substance that slows down chemical reaction. Inhibitors are
sometimes used in certain types of adhesives to prolong storage or working
A substance, which starts the cure process.
International Standard for biocompatibility testing. Test selection is
based on the type of device; Surface Device, External Communicating
Device, and Implant Devices.
The location at which two adherends are held together with a layer of
A joint made by placing one adherend partly over another and bonding
together the overlapped portions.
A joint made by cutting away similar angular segments of two adherends and
bonding the adherends with the cut areas fitted together.
A joint that has insufficient amount of adhesive to produce a
satisifactory bond. This condition may result from too thin a spread
to fill the gap between the adherends, excessive penetration of the
adhesive into the adherend, too short an assembly time, or the use of
A temperature scale with the same increments as the Celsius, beginning at
absolute zero (-273°C, or –459.67°F).
A product made by bonding together two or more layers of material or
materials. To unite layers of material with adhesive.
The stress which is seen on an overlapping joint when loaded in tension.
Energy having wavelengths between 1 and 10 millimeters.
The movement of atoms from one position to another in molecular
Any chemically inert ingredient added to an adhesive formulation that
changes its properties.
Modulus of Elasticity
The measure of the inherent value of elasticity, which a material
A molecule of relative low molecular weight and simple structure capable
of combining with itself or other similar molecules through reactive sites
to form polymers.
Millipascal (Mpa.s.) seconds is a measurement of viscosity where water
equals 1. Same as centipose (cP).
A unit of distance commonly used in measuring wavelength in the
electromagnetic spectrum - one billionth of a meter (10-9
A phenolic-aldehydic resin that, unless a source of methylene groups is
added remains permanently thermoplastic.
The common name for a family of plastics, also known as polyamides.
A lower molecular weight resin or polymer which is used in a radiation
The vapors/fumes which are given off when an adhesive is subject to heat
or to vacuum.
The effect of oxygen which terminates or retards the rate of
An adhesive composition having a characteristic plastic-type consistency,
that is, a high order of yield value, such as that of a paste prepared by
heating a mixture of starch and water and subsequently cooling the
Polycarbonate (PC) is a rigid plastic susceptible to stress cracking with
Measured adhesive performance when substrates are peeled apart.
Polyether imide (PEI) is a heat resistant thermoplastic.
A clear acrylic material (trade name for acrylic polymer), that can be
bonded. Susceptible to stress cracking.
Polyether sulphone (PES) is a thermoplastic offering good chemical
Polyethylene terephtalate (PET) is a rigid thermoplastic offering good
wear resistance and good chemical resistance which is bondable but surface
preparation is important.
A molecule which when exposed to a specific wavelength of energy forms a
reactive species which starts the chain reaction to cause polymer
Radiant energy viewed as bundles of energy.
Term for a wide range of synthetic materials fabricated from organic
A property of adhesives that allows the material to be deformed
continuously and permanently without rupture upon the application of a
force that exceeds the yield value of the material.
A material incorporated in an adhesive to increase its flexibility,
workability, or distensibility. The addition of the plasticizer may
cause a reduction in melt viscosity, lower the temperature of the second
order transistion, or lower the elastic modulus of the solidified adhesive.
A macromolecule consisting of a large number of monomer units. The
molecular weights may range from about 20,000 into the millions.
A chemical reaction in which the molecules of a monomer are linked
together to form large molecules whose molecular weight is a multiple of
that of the original substance. When two or more monomers are
involved, the process is called copolymerization or heteropolymerization.
Polypropylene is a low cost thermoplastic, which may be bonded but
requires special surface treatment.
Sealing of pin holes in welded or cast materials.
A treatment (normally involving heat) applied to an adhesive assembly
following the initial cure, to modify specific properties. To expose
an adhesive assembly to an additional cure, following the initial cure,
for the purpose of modifying specific properties.
The time in which an adhesive may be used before it starts to skin or film
The processes of filling or coating parts to protect them from shock,
vibration or environmental hazards such as water.
Polyphenylene oxide - rigid strong thermoplastic.
A test or series of tests conducted by 1) and adhesive manufacturer to
determine conformity of an adhesive batch to established production
standards, 2) a fabricator to determine the quality of an adhesive before
parts are produced, or 3) an adhesive specification custodian to determine
conformance of an adhesive to the requirements of a specification not
requiring qualification tests.
A coating applied to a surface, prior to the application of an adhesive,
to improve the performance of the bond.
Pounds per Square inch - for measuring pressure, shear, compression or
Polysulfone - tough rigid high strength thermoplastic
PVC- Polyvinyl Chloride (uPVC)
PVC is a soft flexible plastic, which may be made rigid and is then known
A series of tests conducted by the procuring activity, or an agent thereof
to determine conformance of materials, or materials system, to the
requirements of a specification which normally results in a qualified
products lists under the specification. Generally, qualification
under a specification requires conformance to all tests in the
specification, or it may be limited to conformance to a specific type or
class, or both, under the specification.
A common test used to measure the yellowing of a surface. A coated
panel is exposed for 500 hours in a QUV(R) chamber. The chamber runs
on a cycle of 12 hours of UV light exposure and 12 hours of 40°C/100%
A chemical, which serves two purposes in a formulation: thinning or
viscosity reduction and providing reactivity with other ingredients for
curing or polymerization.
A solid, semisolid, or psuedosolid organic material that has an indefinite
and often high molecular weight, exhibits a tendency to flow when
subjected to stress, usually has a softening or melting range, and usually
The way materials flow - relating to liquids and plastics.
Generally taken as being between 20°C and 30°C (68°F and 86°F).
Also known as slump relating to the flow of the adhesive.
A range between which a cured adhesive may be used and considered to
To convert an adhesive into a fixed or hardened state by chemical or
physical action, such as condensation, polymerization, oxidation,
vulcanization, gelation, hydration, or evaporation of volatile
The measured ability of a material to withstand shear stress.
The effects of forces acting in parallel but opposite directions.
The amount of time a material may be stored under specified conditions
with no significant changes in properties.
Generally very flexible sealants
Percentage by weight of the nonvolatile matter in the adhesive.
See Solids Content
A liquid, which is capable of dissolving uncured and cured adhesives.
Also, may be used as a catalyst to initiate cure of some types of
Specific Gravity (SG)
Ratio of the density of a substance to that of water, where water is equal
A nozzle, which is used in conjunction with a twin barrelled cartridge.
The nozzle contains a mixing element to ensure that as the adhesive
is pushed down through the nozzle it mixes thoroughly. These nozzles
allow fully mixed product to be applied direct to the work piece, and
remove the need to mix by hand and the risk of entrapping air within the
Certain adhesives may cause some plastics to "relax" or "crazy
Structural Acrylic Adhesive
An adhesive whose formulation is based on acrylic chemistry, which is
capable of meeting significant load requirements.
A bonding agent used for transferring required loads between adherends
exposed to service environments typical fro the structure involved.
A material upon the surface of which an adhesive-containing substance is
spread for any purpose, such as bonding or coating. A broader term
A physical or chemical preparation, or both, of an adherend to render it
suitable for adhesive joining. A method by which a substrate is made
suitable to be bonded.
A material produced by chemical means, which is not naturally occurring.
The property of an adhesive that enables it to form a bond of measurable
strength immediately after adhesive and adherend are brought into contact
under low pressure.
The stress an adhesive can withstand without fracturing, normal to the
duration of loading.
An electric device used to monitor temperature.
A material capable of being repeatedly softened by heat and hardened by
A material that will undergo or has undergone a chemical reaction by the
action of heat, catalysts, ultraviolet light, etc., leading to a
relatively infusible state. A plastic which, when heated, will not melt
but will eventually char and burn.
Non-drip characteristic – an adjective to describe a material, which
will thin on shearing and then recover a gel like structure on standing.
A property of adhesive systems to thin upon isothermal agitation and to
thicken upon subsequent rest.
The resistance to a turning force about an axis.
A system designed to arrest crack propagation within an adhesive.
Ultra high molecular weight polyethylene - good wear resistance, good
impact performance but to be bonded needs special surface treatments.
Ultraviolet Light (UV)
Radiant energy in the wavelength band of 180 to 400 nanometers.
USP Class VI Test
A set of biocompatibility tests, in which extracts and strips of cured
adhesive or plastic are tested on mice and rabbits.
UV Curable Adhesive
An adhesive whose cure is initiated by UV light.
A measurement of the thickness of a liquid - usually measured in cP (centipoise)
or mPa.s (millipascal seconds). The ratio of the shear stress
existing between laminae of moving fluid and the rate of shear between
these laminae. A fluid is said to exhibit Newtonian behavior when
the rate of shear is proportional to the shear stress. A fluid is
said to exhibit non-Newtonian behavior when an increase or decrease in the
rate of shear is not accompanied by a proportional increase or decrease in
the shear stress.
Organic chemicals, which evaporate easily (at low or ambient temperatures).
A chemical reaction in which the physical properties of a rubber are
changed in the direction of decreased plastic flow, less surface tackiness,
and increased tensile strength by reacting it with sulfur or other
A significant variation from the original, true or plane surface.
Aircraft crack resisting test originated by Boeing.
Weight gained or lost by a material after exposure to a test condition.
The coating of a substrate surface with an adhesive.
The flow of a liquid along a surface into a narrow space, similar to
The period of time during which an adhesive, after mixing with catalyst,
solvent, or other compounding ingredients, remains suitable for use.
A guide as to when the adhesive has sufficient strength to withstand a
light, working load but is not yet fully cured.
The stress (either normal or shear) at which a marked increase in
deformation occurs without an increase in load.