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GB/T 2943-2008 English PDF (GBT2943-2008)

GB/T 2943-2008 English PDF (GBT2943-2008)

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GB/T 2943-2008: Terms of adhesive

This Standard specifies the terms and definitions used in the field of adhesives. This Standard may be used by relevant departments in domestic and international technical and business exchanges. When formulating and revising standards and compiling technical documents and books, if relevant terminology is used, it shall be implemented in accordance with the provisions of this Standard.
GB/T 2943-2008
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.180
G 38
Replacing GB/T 2943-1994
Terms of Adhesive
ISSUED ON: JUNE 18, 2008
IMPLEMENTED ON: FEBRUARY 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 General Terms ... 4
3 Components ... 6
4 Category Nouns ... 8
5 Adhesion Process ... 13
6 Processing Machinery and Coating Equipment ... 16
7 Bonded Products and the Defects ... 17
8 Performance and Test ... 19
9 English Index ... 24
Terms of Adhesive
1 Scope
This Standard specifies the terms and definitions used in the field of adhesives. This Standard may be used by relevant departments in domestic and international technical and business exchanges. When formulating and revising standards and compiling technical documents and books, if relevant terminology is used, it shall be implemented in accordance with the provisions of this Standard.
2 General Terms
2.1 Adhesion
The process of combining solid surfaces by physical force, chemical force, or both. Synonym: adherence
2.2 Cohesion
The state in which the particles in a single substance are combined by the primary valence force and the secondary valence force.
2.3 Mechanical adhesion
The combination of two surfaces through the meshing action of the adhesive. Synonym: mechanical adherence
2.4 Adhesive failure; adhesion failure
A visible damage phenomenon that occurs at the interface between the adhesive and the adherend.
2.5 Cohesive failure; cohesion failure
A visible damage that occurs inside the adhesive.
2.6 Bulk failure
A visible damage that occurs inside the adherend.
2.7 Compatibility
2.16 Adhesive layer
The adhesive layer in bonded assembly.
2.17 Crosslinking; crosslink
The process of combining these molecules into one body by forming chemical bonds between molecules.
2.18 Squeeze-out
The adhesive is squeezed out from the bonded assembly after applying pressure. 2.19 Dry tack; aggressive tack
A characteristic of certain adhesives (especially non-vulcanized rubber-based adhesives). When the volatile components in the adhesive evaporate to a certain extent, and feels dry by hand, they will stick if in contact with each other. 2.20 Fillet
The part of the adhesive that is filled at the corners of the two adherends (for example, when the honeycomb sandwich core is bonded to the surface material, the adhesive fillet formed at the end of the sandwich core).
2.21 Degree of cure
The degree of chemical reaction that is characterized when the adhesive is cured. 2.22 Ageing
The performance of bonded assembly deteriorates and even loses use value with time. 2.23 Tack
After the adhesive is in contact with the adherend, a certain amount of bonding strength is formed immediately after a slight pressure is applied.
3 Components
3.1 Binder
The substance that plays the role of adhesion in the formulation of the adhesive. 3.2 Curing agent; hardening agent; hardener
A substance that directly participates in a chemical reaction to solidify the adhesive. 3.13 Thixotropic agent
A substance that can improve the thixotropy of the adhesive or make it thixotropic. 3.14 Stabilizer
A substance that helps the adhesive maintain its stable performance during formulation, storage and use.
3.15 Antioxidant
A substance that can delay or prevent deterioration of material properties caused by oxidation or auto-oxidation processes.
3.16 Tackfier
A substance that can increase the tack of the adhesive film or extend the tack range of the adhesive.
3.17 Thickener
A substance that is added to increase the apparent viscosity of the adhesive. 3.18 Fiexibilier; toughener
A substance that improves the brittleness and toughness of the adhesive in the formulation.
3.19 Emulsifier; emulsifying agent; dispersant
The surfactant that stably disperses the immiscible liquid/liquid or solid/liquid through reducing the interfacial tension of the two phases.
3.20 Catalyst
A substance that can change the rate of a chemical reaction and theoretically maintain its chemical properties at the end of the reaction.
3.21 Inhibitor; retarder
A substance that can inhibit chemical reactions and prolong its shelf life or pot life. 4 Category Nouns
4.1 Natural glue
An adhesive that is made of animal and plant polymer compounds as raw materials. 4.12 Toughened adhesive
An adhesive that its structural characteristics determine the it can resist further crack propagation.
4.13 Film adhesive
A film-like adhesive with or without a carrier that is usually cured by heating and pressing.
Synonym: Bonded film
4.14 Adhesive bar; adhesive stick
An adhesive that is made of resin, etc., contains no solvent, and is in the form of a bar at room temperature.
Synonym: Bonded stick
4.15 Powder adhesive
An adhesive that is made of resin, etc., contains no solvent, and is in the form of a powder at room temperature.
4.16 Paste adhesive
An adhesive that appears as paste.
4.17 Spray adhesive
An adhesive that can spray out small rubber particles through a pressure medium. 4.18 Mastic adhesive
A non-flowing adhesive that can be moulded at room temperature. It is used to seal wide gaps.
4.19 Adhesive tape
The tape-shaped product that is coated with glue on one or both sides of substrates such as paper, cloth, film, and metal foil.
4.20 Structural adhesive
An adhesive that is used for bonding of stressed structural parts and can withstand long-term use stress and environmental effects.
4.21 Primer
generally used for bonding the core material and the panel in the honeycomb sandwich structure.
4.33 Foaming adhesive
An adhesive that foams and expands in situ during curing, and reduces its apparent density by a large number of gas cells dispersed in the entire adhesive layer. 4.34 Foamed adhesive; cellula adhesive
An adhesive that contains countless air-filled microbubbles and significantly reduces its apparent density.
4.35 Encapsulated adhesive
An adhesive that encapsulates particles or droplets of reactive components in a protective film (microcapsules), and prevents curing before the protective film is destroyed by a proper method.
4.36 Electric conductive adhesive
An adhesive with conductive properties, such adhesive generally contains conductive powders such as silver, copper, and graphite.
4.37 Heat activated adhesive
A dry adhesive that makes it sticky by heating.
4.38 Hot-melt adhesive
An adhesive that is applied in a molten state and cooled to a solid state to complete the bonding.
4.39 Contact adhesive
An adhesive that is applied to the surface of two adherends and then laminated together after drying, and then forms the bonding strength without applying continuous pressure.
4.40 Water-borne adhesive; aqueous adhesive
An adhesive that uses water as a solvent or dispersion medium.
4.41 Water-resistant adhesive
An adhesive that is often exposed to water and moisture, but it can still maintain the bonding performance (or use performance).
The double spread refers to the amount of adhesive applied to the two adherends of the adhesive joint.
5.9 Separate application
When applying a two-component adhesive, the two components are respectively applied to two adherends, which are stacked together to form an adhesive joint. 5.10 Impregnation
A process in which the adherend is immersed in an adhesive solution or adhesive dispersion for coating.
5.11 Brush coating
A manual coating method in which the adhesive is applied to the surface of the adherend with a brush. It is suitable for adhesives with slower solvent volatilization speed.
5.12 Drying time
Under specified conditions, the time from adhesive application to adhesive drying. 5.13 Drying temperature
The temperature that is required for the adhesive to dry after adhesive spreading. 5.14 Slippage
During the bonding process, the adherends move relative to each other.
5.15 Fixing
When bonding, the adherend is fixed at the ideal position.
5.16 Open assembly time
The time of exposure to air after the surface of the adherend is glued and before being laminated.
5.17 Closed assembly time
The time after the glued surface is laminated and before the pressure is applied. 5.18 Assembly time
The time from when the adhesive is applied to the adherend to when the assembly is heated or pressurized or both heated and pressurized.
bonding process (excessive temperature, too long time, etc.), which deteriorates the bonding performance.
5.30 Undercure
A phenomenon that the insufficient curing of the adhesive causes poor bonding performance.
5.31 Bag moulding
A method of bonding by using fluid pressure. Generally, the flexible diaphragm or bag is pressed by air, steam, water, etc. or vacuum; and the diaphragm or bag (sometimes connected with a rigid mould) completely covers the material to be bonded. It is possible to apply uniform pressure to the irregularly shaped bonded assemblies to make them bonded together.
6 Processing Machinery and Coating Equipment
6.1 Adhesive mixer
A mechanical device for mixing or formulating adhesives.
6.2 Glue gun
A device that sprays or injects adhesive onto the surface of an adherend under pressure.
6.3 Applicator
A device that coats the adhesive on the surface of the adherend.
6.4 Doctor knife; doctor blade; doctor bar
A device that can adjust the thickness of the adhesive layer and make it evenly coated on the doctor roll or the surface to be coated.
6.5 Doctor roll
A roller that adjusts the thickness of the adhesive by the wiping action produced by the forward or reverse rotation at different surface speeds.
6.6 Impregnator; saturator
The device that uses adhesive to impregnate the paper, fabric, etc. It is generally composed of rollers, dipping tanks, pressing rollers, doctor knives and drying devices. sandwich structures, etc.
7.5 Sandwich structure
A structure that is formed by sandwiching a layer of core material (such as honeycomb core, foam plastic, corrugated board) between two layers of panel materials. 7.6 Joint
The area where two adjacent adherends are bonded together with adhesive. 7.7 Lap joint
A joint that is formed by partially overlapping and bonding the main surfaces of two adherends.
7.8 Butt joint
The adhesive joint where the two end faces or one end face to be glued is perpendicular to the main surface of the adherend.
7.9 Angle joint
The adhesive joint that the main surface ends of the two adherends form an angle. 7.10 Scarf joint
Cut the two adherends into non-90?? corresponding sections, the joint that bonds those two sections into the same plane.
7.11 Dado joint
Tongue-groove adhesive joint.
7.12 Dowel joint
The joint that the bonded parts of the two adherends form a joint with a pin hole or ring sleeve structure (such as bar and pipe; pipe and pipe).
7.13 Starved joint
The joint with insufficient adhesive, and fails to obtain the satisfactory bonding effect. NOTE: This situation occurs because the adhesive is too thin to fill the pores between the adherends; the adhesive penetrates excessively into the adherend; the assembly time is too short or the bonding pressure is too large.
7.14 Sagging
8.4 Viscoelasticity
The deformation of a substance under the action of external force that has both solid (elastic) and liquid (viscous) deformation properties.
8.5 Apparent viscosity
When the fluid is shear rate dependent, the ratio of the shear stress to the shear rate. 8.6 Softening point
Under specified conditions, amorphous polymers (or amorphous polymers) [Translator Note: the two terms here are the same in English] reach a specified temperature when they deform.
8.7 Glass transition
It refers to the reversible transition between the glassy state and the highly elastic state of the amorphous region in amorphous polymers and semi-crystalline polymers. 8.8 Solids content
The mass fraction of non-volatile substances in the adhesive that is measured under the specified test conditions.
Synonym: non-volatile content
8.9 Chemical resistance
The bonded sample can still maintain its bonding performance after the action of chemicals such as acid, alkali, salt and so on.
8.10 Solvent resistance
The bonded sample can still maintain its bonding performance after the solvent is used. 8.11 Water resistance
The bonded sample can still maintain its bonding performance even after being exposed to water or moisture.
8.12 Ablation resistance
The adhesive layer resists high-temperature flame and high-speed air flow. 8.13 Permanence; durability
Under the conditions of use, the ability of the bonded assembly to maintain its When the bonded specimen is broken due to the impact load, the maximum power that is consumed per unit of the bonded surface, which is expressed in J/m2. 8.24 Bending strength
When the bonded specimen is broken or reaches the specified deflection under the bending load, the maximum load that is born per unit of the bonded surface, which is expressed in MPa.
8.25 Persistent strength
Under certain conditions, the maximum static load that the unit bonded surface can bear, which is expressed in MPa.
8.26 Torsional shear strength
Under the action of torsion moment, when the bonded specimen is broken, the maximum tangential shear force that the unit bonded surface can bear, which is expressed in MPa.
8.27 Compressive shear strength of dowel joint
Under the action of axial force, when the dowel joint is broken, the compressive shear force that the unit bonded surface can withstand, which is expressed in MPa. 8.28 Fatigue life
Under the specified load, frequency and other conditions, when the bonded specimen is broken, it refers to the alternating stress or the number of alternating cycles. 8.29 Destructive test
A test to detect the bonding quality of the bonded assembly by destroying it. 8.30 Non-destructive test
A Test to defect the bonding quality of the bonded assembly without destroying it (such as X-ray analysis, ultrasonic flaw detection).
8.31 Boiling test
After immersing the bonded specimen in boiling water for a specified period of time, the test to determine its bonding strength.
8.32 High-low temperature cycles test
A test to detect changes in the performance of the bonded specimen after it is subjected to a specified high and low temperature cycle.

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