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A-stage – An early stage in the reaction of certain thermosetting resins in which the material is fusible and still soluble in certain liquids.
Abrasion resistance – Resistance to wear resulting from mechanical action on a surface.
Abrasive Planer- A planer in which wood is removed by large sandpaper belts
Accelerated aging – A set of laboratory conditions designed to produce in a short time the results of normal aging. Usual factors included are temperature, light, oxygen and water. In recent years, the adhesives industry has come to rely more and more on the “oxygen bomb” test as an indicator of relative life expectancy of a given formulation.
Accelerated weathering – A set of laboratory conditions to simulate in a short time the effects of natural weathering. Most adhesives are generally not subjected to the conditions that are normally considered under weathering tests.
Accelerator – An ingredient used in small amounts to speed up the action of the hardener in a two-part adhesive.
Acetone – A very volatile and flammable solvent that is particularly useful for cleaning metal substrates.
ACGIH – American Conference of Governmental Hygienists
Adhere – To cause two surfaces to be held together by adhesion.
Adherend – A body which is held to another body by an adhesive.
Adhesion – The state in which two surfaces are held together by interfacial forces which may consist of valence forces or interlocking action, or both.
Adhesion, mechanical – Adhesion between surfaces in which the adhesive holds the parts together by interlocking action.
Adhesion, specific – Adhesion between surfaces that are held together by valence forces of the same type as those which give rise to cohesion.
Adhesive – A substance capable of holding materials together by surface attachment. Same as cement.
Adhesive failure – Type of failure characterized by pulling the adhesive loose from the substrate.
Adhesive, assembly – An adhesive that can be used for bonding parts together such as the manufacture of a boat, airplane, furniture, and the like.
Adhesive, cold-setting – An adhesive that sets at temperature below 68°F (20°C).
Adhesive, contact – 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, dispersion – A two phase system in which one phase is suspended in a liquid.
Adhesive, foamed – An adhesive, the apparent density of which has been decreased substantially by the presence of numerous gaseous cells dispersed throughout its mass. Same as cellular adhesive.
Adhesive, heat activated – A dry adhesive film that is rendered tacky or fluid by application of heat or heat and pressure to the assembly.
Adhesive, hot melt – An adhesive that is applied in a molten state and forms a bond on cooling to a solid state.
Adhesive, hot-setting – An adhesive that requires a temperature at or above 100°C (212°F) to set.
Adhesive, intermediate temperature setting – An adhesive that sets in the temperature range of 31°-99°C (87°-211°F).
Adhesive, pressure sensitive – A viscoelastic material which in solvent-free form remains permanently tacky. Such a material will adhere instantaneously to most solid surfaces with the application of very slight pressure.
Adhesive, room temperature setting – An adhesive that sets in the temperature range of 20°-30°C (68°-86°F).
Adhesive, separate application – A term used to describe an adhesive consisting of two parts, one part being applied to one substrate and the other part to the other substrate and the two brought together to form a joint.
Adhesive, solvent – 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.
Adsorption – The action of a body in condensing and holding gases and other materials at its surface.
AFMA – American Furniture Manufacturers Association
Aging – The progressive change in the chemical and physical properties of a sealant or adhesive.
Aliphatic resin glue – Yellow glues which provide more grab for shorter clamp times, and offer better water resistance and heat resistance than traditional white glues.
Alligatoring – Cracking of a surface into segments so that it resembles the hide of an alligator.
Alternating current – The change of an alternating flow of current from zero to a positive peak, returning through zero to a negative peak and back to zero repeated continuously.
Ambient – Usual or surrounding conditions.
Ambient temperature – Temperature of the air surrounding the object under construction.
Ampere – A unit of electric current. One ampere flows through a conductor having a resistance of one ohm, when there is one-volt difference between the ends of the circuit. (A.)
Anaerobic – Adhesives that cure in the absence of oxygen.
Aniline dye – Any of a large number of synthetic dyes derived from aniline, usually obtained from coal tar.
ANSI – American National Standards Institute.
Arc – A self-sustaining visible flow or discharge of electricity through air that will result in a burn if the flow is through a material of normal insulating properties.
Asphalt – Naturally occurring mineral pitch or bitumen.
Assembly – A group of materials or parts, including the adhesive, which has been placed together for bonding or which has been bonded together.
Assembly Time – Also called Open Time. The time period from the application to adhesive until the final application of pressure. This term includes both Closed and Open Assembly Times.
Asthma – A disease characterized by recurrent attacks of wheezing and shortness of breath.
ASTM – American Society for Testing and Materials.
Auto Tune- A circuit installed in a RF generator designed to maintain the optimum amount of power during a RF cure cycle.
Automatic Edging Saw – A straight line rip saw used to edge one side of the blank before it is ripped on the rip saw. This is accomplished by using canted, automatic rollers to feed the stock through the saw after it has been planed.
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