- 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 useful for cleaning various substrates.
- Adhere
- To cause two surfaces to be help together through adhesion.
- Adhesion
- The state in which two surfaces are held together by interfacial forces; consisting of valence forces, interlocking action, or both.
- Adhesion (mechanical)
- Adhesion between surfaces in which the adhesive holds the parts together by interlocking action.
- A component of an adhesive composition that is primarily responsible for the adhesive forces that hold the two bodies together.
- Curing
- The solidification of an adhesive or coating after which the resulting material has achieved its intended mechanical and physical properties.
- De-roping
- The removal of adhesive squeezed from a bond line when the parts are mated; most easily achieved when the adhesive is partially cured but still soft.
- Density
- The mass per unit volume of an adhesive. It is commonly expressed in the following ways: lb/gal (pounds per gallon), g/cm3 (grams per cubic centimeter) or kg/m3 (kilograms per cubic meter).
- Exotherm
- The chemical reactions that occur during the adhesive curing process to produce heat, of which the amount generated is a constant for a given mass of adhesvie to reach a specified degree of cure.
- Fixture Time
- See Handling Strength
- Flashpoint
- The lowest temperature at which vapors from a volatile component will ignite upon the application of a small flame under controlled conditions.
- Glass Transition Temperature
- The temperarture at which the adhesive transitions between the glassy and rubbery states.
- Green Strength
- See Handling Strength
- Handling Strength
- The time required after mixing for an adhesive to attein sufficient strength to hold parts together without additional fixturing; typically considered to be 50 to 100 psi shear strength or more. It is directly related to the cure rate, temperature, and bond-line thickness.
- Hardness
- Measured with a Shore hardness tester in usually the A or D scale.
- Inhibitor
- A substance that slows down chemical reaction. Inhibitors are sometimes used in certain types of adhesives to prolong storage or working life.
- Joint
- A general area of contact for a bonded structure.
- Kilo
- A prefix meaning one thousand.
- Laminate
- To join two layers of material with an adhesive to produce a united product.
- Modulus
- The relationship between stress and elongation (unit of force per unit of area). As a general rule, the higher this is, the lower the elongation.
- NIOSH
- National Institute of Occupational Safety and Health
- One-component Adhesive
- Adhesive or coating that is made up of a single component which cures when exposed to a specific energy source or environment.
- Open Time
- The allowable time between the mixing and mating of the parts of a multi component adhesive. Mating the parts outside of this time frame, will result in a sub-optimal to poor bond strength. This amount of time is directly related to the cure rate, temperature, and the adhesive's mass.
- pH
- Value that represents the degree of acidity or alkalinity of an aqueous solution.
- Pot Life
- See Open Time
- Purge Duration
- The time necessary to completely displace an adhesive in a static mixer.
- Purge Time
- The time it takes a mixed adhesive, sitting in a static mixer undisturbed, to reach a state in which it can no longer be dispensed.
- Stability
The abiliy of a material to remain unchanged.
- Strength
- The maximum load capacity of a given material or assembly as a function of the area the load is acting over.
- Time to Full Cure
- The time required after mixing for the adhesive to reach its ultimate mechanical properties.
- Two-component Adhesive
- Adhesive or coating that consists of two separate components in the unreacted state and need to be thoroughly mixed together at specific ratios to achieve proper curing.
- UV
- Acronym for Ultraviolet Light
- Viscosity
- Measurement of material's resistance to flow.
- Wetting
- An adhesive's ability to maintain intimate contact with the surfaces to be bonded and through which maximum adhesion is achieved.
- Working Time
- See Open Time
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