Difference between revisions of "Adhesive"
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== Description == | == Description == | ||
− | Any non-metallic substance used to adhere one surface to another. Adhesives provide a wide selection of properties, solubility, tackiness, bonding time, and bonding strength. They can be used on nearly every kind of surface, such as wood, glass, metal, plastic, paper, fabric, and rubber. Adhesives are usually activated by water, solvents, pressure, heat, cold, or UV radiation. In some cases, surface treatment, abrasion, or an adhesion promoter may be needed to increase the strength or durability of the adhesive bond | + | Any non-metallic substance used to adhere one surface to another. Adhesives provide a wide selection of properties, solubility, tackiness, bonding time, and bonding strength. They can be used on nearly every kind of surface, such as wood, glass, metal, plastic, paper, fabric, and rubber. Adhesives are usually activated by water, solvents, pressure, heat, cold, or UV radiation. In some cases, surface treatment, abrasion, or an adhesion promoter may be needed to increase the strength or durability of the adhesive bond. Alternative binding techniques include sewing, mechanical fasteners and welding. |
− | + | Adhesives may be classified as inorganic and organic adhesives: | |
+ | * Inorganic adhesives: [[water%20glass|water glass]], [[plaster%20of%20Paris|plaster of Paris]] and [[portland%20cement|portland cement]]. | ||
+ | * Organic adhesives: animal ([[hide%20glue|hide]], [[bone%20glue|bone]], [[blood%20glue|blood]], [[casein%20adhesive|casein]], etc.), or vegetable ([[starch|starch]], [[gum|gum]], [[natural%20resin|natural resin]], etc.) or synthetic ([[acrylic%20resin|Acrylic]], [[polyvinyl%20acetate|Vinyl acetate]], [[cyanoacrylate resin|Cyanoacrylate]], [[epoxy|Epoxy]], [[silicone adhesive|Silicone]], etc.). | ||
− | + | Please see tables below for more information. | |
===Natural Adhesives=== | ===Natural Adhesives=== | ||
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| Protein-based made from blood or eggs | | Protein-based made from blood or eggs | ||
| Dark color, water-soluble powder that dries to a water-resistant film when activated with an alkali | | Dark color, water-soluble powder that dries to a water-resistant film when activated with an alkali | ||
− | | | + | | Plywood, masonry |
|- | |- | ||
| [[Asphalt]], [[Bitumen]], [[Pitch]], [[Tar]] | | [[Asphalt]], [[Bitumen]], [[Pitch]], [[Tar]] | ||
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| Thick hydrocarbon-based liquids distilled from plants, wood or oil/coal deposits | | Thick hydrocarbon-based liquids distilled from plants, wood or oil/coal deposits | ||
| Typically dark and viscous, softens with heat, may evolve volatile compounds; water-repellant | | Typically dark and viscous, softens with heat, may evolve volatile compounds; water-repellant | ||
− | | | + | | Boats, water-proofing |
|- | |- | ||
| [[Casein]] | | [[Casein]] | ||
| Milk glue | | Milk glue | ||
− | | | + | | Ancient times |
| Protein-based made from milk curd mixed with alkalis | | Protein-based made from milk curd mixed with alkalis | ||
| Water resistant; tensile strength eceeds most woods, non-toxic | | Water resistant; tensile strength eceeds most woods, non-toxic | ||
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| Hydrolyzed collagen made from animal connective tissue and bones; hides are acid-treated, neturalized and repeatedly soaked | | Hydrolyzed collagen made from animal connective tissue and bones; hides are acid-treated, neturalized and repeatedly soaked | ||
| Hardens when cooled; may be slightly brittle; water-soluble | | Hardens when cooled; may be slightly brittle; water-soluble | ||
− | | | + | | Cabinetmaking, bookbinding, sizing fabrics |
|- | |- | ||
| [[Keratin]] | | [[Keratin]] | ||
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| Partially hydrolyzed keratin; hooves or horns are fragmented then boiled and acidified. | | Partially hydrolyzed keratin; hooves or horns are fragmented then boiled and acidified. | ||
| Hardens when cooled; does not become brittle | | Hardens when cooled; does not become brittle | ||
− | | | + | | Gluing and stiffening textiles, cabinetmaking, glass sealant |
|- | |- | ||
| [[Mucilage]] | | [[Mucilage]] | ||
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| Polar glycoprotesin and exopolysaccharid etracted from plants and seeds | | Polar glycoprotesin and exopolysaccharid etracted from plants and seeds | ||
| Viscous; soluble in water; edible; low bonding strength; sensitive to moisture, biodegradation and insects | | Viscous; soluble in water; edible; low bonding strength; sensitive to moisture, biodegradation and insects | ||
− | | | + | | postage stamps, labels on metal cans |
|- | |- | ||
| [[Starch]] | | [[Starch]] | ||
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| Starch granules swell in water for form a thick tacky gel upon cooling | | Starch granules swell in water for form a thick tacky gel upon cooling | ||
| Soluble in cold water; become brittle with age; sensitive to moisture, biodegradation and insects | | Soluble in cold water; become brittle with age; sensitive to moisture, biodegradation and insects | ||
− | | | + | | Postage stamps, corrugated board, wallpaper |
|- | |- | ||
| [[Natural resin|Tree resins]] | | [[Natural resin|Tree resins]] | ||
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| Clear to translucent resins soluble in alcohol or turpentine; insoluble in water | | Clear to translucent resins soluble in alcohol or turpentine; insoluble in water | ||
| Darken with age | | Darken with age | ||
− | | | + | | Adhere jewels and beads, repair broken vessels |
|- | |- | ||
| [[Wax]] | | [[Wax]] | ||
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| Long-chain hydrocarbons | | Long-chain hydrocarbons | ||
| Becomes soft with heat | | Becomes soft with heat | ||
− | | | + | | Repair broken vessels; adhere pigments and inks |
|- | |- | ||
| [[Rubber (natural, vulcanized)|Rubber]] (natural, vulcanized) | | [[Rubber (natural, vulcanized)|Rubber]] (natural, vulcanized) | ||
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| Solvent evaporates as it sets; latex may be an allergen; waterproof, discolors and cracks with time | | Solvent evaporates as it sets; latex may be an allergen; waterproof, discolors and cracks with time | ||
| Used prior to synthetics | | Used prior to synthetics | ||
+ | |} | ||
+ | |||
+ | |||
+ | ===Synthetic Adhesives=== | ||
+ | {| class="wikitable" | ||
+ | |- | ||
+ | ! Adhesive | ||
+ | ! Examples | ||
+ | ! Documented use | ||
+ | ! Composition | ||
+ | ! Properties | ||
+ | ! Applications | ||
+ | |- | ||
+ | | Acrylic (solvent-based) | ||
+ | | UHU All Purpose clear adhesive; Bostik All Purpose clear adhesive; 3M Brand PSA backing adhesive | ||
+ | | 1940s | ||
+ | | Solvent cured acrylic resin often containing fillers like calcium carbonate, silica, and plasticizer. | ||
+ | | Clear, strong, fast setting glue that adhere to a wide range of materials | ||
+ | | | ||
+ | |- | ||
+ | | Acrylic latex | ||
+ | | Flugger; Weld-On acrylic cement; Trinseo | ||
+ | | 1950s | ||
+ | | Butyl methacrylate, calcium carbonate, water | ||
+ | | inexpensive, fast-drying, and paintable; minimal shrinkage; used indoors | ||
+ | | Popular white glue commonly used in houses and schools | ||
+ | |- | ||
+ | | Arylic (pressure-sensitive) | ||
+ | | most 3M brand tapers | ||
+ | | | ||
+ | | Methacrylate copolymers on polyethylene or polypropylene substrates; may contain tackifiers | ||
+ | | Low cost, thermally and oxidatively stable, optically clear. | ||
+ | | Used for plastic, paper, fabric, tapes and labels | ||
+ | |- | ||
+ | | Acrylonitrile polymers | ||
+ | | Acrylonitrile -butadiene,; acrylonitrile-butadiene Styrene (ABS); Styrene-Acrylonitrile (SAN); Nitrile rubber; Permabond | ||
+ | | | ||
+ | | Solvent borne adhesive composed of acrylonitrile -polymer combinations along with solvent, tackifier and plasticizer | ||
+ | | Bonds vinyl, other elastomers and fabrics; provides good wear, oil and water resistance; may be used for under watr applications | ||
+ | | | ||
+ | |- | ||
+ | | Butyl rubber (synthetic) | ||
+ | | Butyl mastic, Buna-N rubber | ||
+ | | 1950s | ||
+ | | Isobutylene-isoprene, talc calcium carbonate, mineral spirits, adhesion promoters | ||
+ | | Elastomeric with excellent peel strecngth but low shear strength; sticky and messy; more resistant to sunlight than natural rubbers; combustible; paintable | ||
+ | | Primarily used outdoors for metal and masonry joints that may expand and contract (gutters) | ||
+ | |- | ||
+ | | Cyanoacrylate | ||
+ | | Krazy glue, Superglue, Zap, ELFY, Eastman 910 | ||
+ | | 1941 | ||
+ | | Thermosetting adhesive without heat or added catalyst | ||
+ | | Difficult to remove; degraded by UV light and alkalis | ||
+ | | Bonds metals to non-metals; used for glass, ceramic, and suturing skin | ||
+ | |- | ||
+ | | Epoxies | ||
+ | | Ablebond, Araldite AY103; Hxtal Nyl-1, Phiilyseal, CM Nond, Epotek, UHU | ||
+ | | 1939 | ||
+ | | A famil y of thermosetting resins that polymerize with themseolves or with co-reactants. Th reaction is exothermix | ||
+ | | High strength, good abrasion and chemical resistance, low water absorption; used for paint,coating, hard-plastics as well as adhesives; may cause allergic reactions | ||
+ | | Bonds wood, metal, glass , stone and some plastics | ||
+ | |- | ||
+ | | Ethylene vinyl acetate | ||
+ | | hot-melt glues, Elvax, A-C copolymer, Vinamul, Mowilith, Elvace 1874, Jade 834 | ||
+ | | | ||
+ | | polyethylene mixed with about 10-40% vinyl acetate | ||
+ | | thermosetting polymer with rubber-like characteristics; soft, flexible material is waterproof, tough and stress-crack resistant; it has high cohesive strength and fast-setting speed | ||
+ | | Bond textiles, paper, glass; used as carpet backing adhesive | ||
+ | |- | ||
+ | | Phenol formaldehyde | ||
+ | | phenolic resin, resorcinol, Bakelite | ||
+ | | 1907 | ||
+ | | | ||
+ | | Temperature and UV resistant; off gases phenol and formaldehyde; water soluble until set; low cost; darkens in sunlight | ||
+ | | Used for laminating plywood especially for outdoor use | ||
+ | |- | ||
+ | | Urea formaldehyde | ||
+ | | | ||
+ | | 1896 | ||
+ | | Water-soluble resin | ||
+ | | Off-gases urea, ammonia and formaldehyde, thermosetting; degraded by hear, acids, alkalis | ||
+ | | Used for laminating plywood; particleboard | ||
+ | |- | ||
+ | | Polysulfide | ||
+ | | Neoprene, Thiokol | ||
+ | | 1950s | ||
+ | | Any synthetic rubber vulcanized with sulfur (Neoprene, styrene-butadiene, polyisoprene). Some polusulfide elastomers are used with epoxies to provide flexibility | ||
+ | | will melt acrylic, polycarbonate, ABS and PVC plastics; can be used on nylon, epoxy, polyoxymethylene; may release sulfur; may contain PCBs; poor tensile strength; abrade easily; replaced in 1980s by silicone and urethane sealants | ||
+ | | still used for chemically resistant tapes and gaskets in aircraft because of their vibration durability | ||
+ | |- | ||
+ | | Silicone | ||
+ | | Silastic, Clear Museum gel, Dowsil RTV | ||
+ | | 1960s | ||
+ | | Silicone resin cured with moisture or peroxides; may contain fumed silica, calcium cabonate, ground quartz, carbon black, talc, plasticizers, acetone, methylene chloride. May be clear, white, or colored | ||
+ | | water-repellent; long-life; wide temperature range; mold/mildew resistant; not paintable; poor adhesion; may release acetic acid or methanol on cure; may have residual curing compounds and silicone oils; may stain porous materials | ||
+ | | Sealants are often used in outdoors settings; Pressure sensitive adhesives are used on skin for medical devices and drug delivery | ||
+ | |- | ||
+ | | Polyurethane | ||
+ | | Gorilla glue | ||
+ | | 1937 | ||
+ | | Available and one- or two-component adhesives, solvent -free; may be bulked with limestone and/or quartz | ||
+ | | shrink free; very durable; abrasion resistant; flexible at low temperatures; combustible producing toxic fumes; may release acetic acid on curing, aging, or deterioration; susceptiple to hydrolysis that may decrease adhesion | ||
+ | | Strong adhesive for metal and glue; laying carpets and wood floor board; may dissolve some plastics | ||
+ | |- | ||
+ | | Vinyl latex | ||
+ | | Vinyl emulsion; vinyl acrylic emulsion; white latex | ||
+ | | late 1960s | ||
+ | | Polyvinyl acetate as an emulsion in water usually with calcium carbonate, plasticizers and dispersing agents. Vinyl acrylic latex contains a co-polymer of vinyl acetate and butyl acrylate. | ||
+ | | inexpensive; high stability; water-resistant when dry; may be used as a liquid or solid (for heat sealing); may evolve trace acetic acid as it cures; | ||
+ | | Used for paper, textile, packaging, mounting photographs, laying carpets and floor tiles; also used as sealants and paints | ||
|} | |} | ||
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kleefstof (Ned.); adhésif (Fr.); colle (Fr.); Klebstoff (Deut.); adesivo (It.); adhesivo (Esp.); adesivo (Port.); adhesiv (Sven.); bindemedel (Sven.); mastic; cement; glue; mucilage; paste; | kleefstof (Ned.); adhésif (Fr.); colle (Fr.); Klebstoff (Deut.); adesivo (It.); adhesivo (Esp.); adesivo (Port.); adhesiv (Sven.); bindemedel (Sven.); mastic; cement; glue; mucilage; paste; | ||
+ | |||
+ | == Physical and Chemical Properties == | ||
+ | |||
+ | [[media:download_file_292.pdf|General Characteristics of Polymers]] | ||
+ | |||
+ | [[media:download_file_293.pdf|Physical Properties for Selected Thermoplastic Resins]] | ||
+ | |||
+ | [[media:download_file_294.pdf|Physical Properties for Selected Thermoset Resins]] | ||
== Resources and Citations == | == Resources and Citations == | ||
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− | [[Category:Materials database]][[Category:MWG]] | + | [[Category:Materials database]][[Category:MWG]][[Category:Adhesives]][[Category:Comparisons]] |
Latest revision as of 09:19, 2 October 2024
Description
Any non-metallic substance used to adhere one surface to another. Adhesives provide a wide selection of properties, solubility, tackiness, bonding time, and bonding strength. They can be used on nearly every kind of surface, such as wood, glass, metal, plastic, paper, fabric, and rubber. Adhesives are usually activated by water, solvents, pressure, heat, cold, or UV radiation. In some cases, surface treatment, abrasion, or an adhesion promoter may be needed to increase the strength or durability of the adhesive bond. Alternative binding techniques include sewing, mechanical fasteners and welding.
Adhesives may be classified as inorganic and organic adhesives:
- Inorganic adhesives: Water glass, Plaster of Paris and Portland cement.
- Organic adhesives: animal (hide, bone, blood, casein, etc.), or vegetable (Starch, Gum, Natural resin, etc.) or synthetic (Acrylic, Vinyl acetate, Cyanoacrylate, Epoxy, Silicone, etc.).
Please see tables below for more information.
Natural Adhesives
Adhesive | Examples | Earliest use | Composition | Properties | Applications |
---|---|---|---|---|---|
Albumin | Blood glue, egg glue | Ancient times | Protein-based made from blood or eggs | Dark color, water-soluble powder that dries to a water-resistant film when activated with an alkali | Plywood, masonry |
Asphalt, Bitumen, Pitch, Tar | birch-bark tar, pitch, bitumen asphalt | Ancient times | Thick hydrocarbon-based liquids distilled from plants, wood or oil/coal deposits | Typically dark and viscous, softens with heat, may evolve volatile compounds; water-repellant | Boats, water-proofing |
Casein | Milk glue | Ancient times | Protein-based made from milk curd mixed with alkalis | Water resistant; tensile strength eceeds most woods, non-toxic | Woodworking, paper glue, fireproofing; glass bottle labels, gilding leather |
Gelatin | Hide glue, Rabbitskin glue, Bone glue, Fish glue, Isinglass | Ancient times | Hydrolyzed collagen made from animal connective tissue and bones; hides are acid-treated, neturalized and repeatedly soaked | Hardens when cooled; may be slightly brittle; water-soluble | Cabinetmaking, bookbinding, sizing fabrics |
Keratin | Hoof, Horn | Medieval or earlier | Partially hydrolyzed keratin; hooves or horns are fragmented then boiled and acidified. | Hardens when cooled; does not become brittle | Gluing and stiffening textiles, cabinetmaking, glass sealant |
Mucilage | Agar, Algin | Ancient times | Polar glycoprotesin and exopolysaccharid etracted from plants and seeds | Viscous; soluble in water; edible; low bonding strength; sensitive to moisture, biodegradation and insects | postage stamps, labels on metal cans |
Starch | potato, rice, wheat; Paste | 1847 | Starch granules swell in water for form a thick tacky gel upon cooling | Soluble in cold water; become brittle with age; sensitive to moisture, biodegradation and insects | Postage stamps, corrugated board, wallpaper |
Tree resins | Balsam, Dammar, Gum arabic, Mastic | Ancient times | Clear to translucent resins soluble in alcohol or turpentine; insoluble in water | Darken with age | Adhere jewels and beads, repair broken vessels |
Wax | Insect wax (Beeswax), plant wax (carnauba); Mineral wax (Paraffin) | Ancient times | Long-chain hydrocarbons | Becomes soft with heat | Repair broken vessels; adhere pigments and inks |
Rubber (natural, vulcanized) | Rubber cement; latex | 1830 to WWII | Natural exudation obtained from plants, usually dissolved in solvent | Solvent evaporates as it sets; latex may be an allergen; waterproof, discolors and cracks with time | Used prior to synthetics |
Synthetic Adhesives
Adhesive | Examples | Documented use | Composition | Properties | Applications |
---|---|---|---|---|---|
Acrylic (solvent-based) | UHU All Purpose clear adhesive; Bostik All Purpose clear adhesive; 3M Brand PSA backing adhesive | 1940s | Solvent cured acrylic resin often containing fillers like calcium carbonate, silica, and plasticizer. | Clear, strong, fast setting glue that adhere to a wide range of materials | |
Acrylic latex | Flugger; Weld-On acrylic cement; Trinseo | 1950s | Butyl methacrylate, calcium carbonate, water | inexpensive, fast-drying, and paintable; minimal shrinkage; used indoors | Popular white glue commonly used in houses and schools |
Arylic (pressure-sensitive) | most 3M brand tapers | Methacrylate copolymers on polyethylene or polypropylene substrates; may contain tackifiers | Low cost, thermally and oxidatively stable, optically clear. | Used for plastic, paper, fabric, tapes and labels | |
Acrylonitrile polymers | Acrylonitrile -butadiene,; acrylonitrile-butadiene Styrene (ABS); Styrene-Acrylonitrile (SAN); Nitrile rubber; Permabond | Solvent borne adhesive composed of acrylonitrile -polymer combinations along with solvent, tackifier and plasticizer | Bonds vinyl, other elastomers and fabrics; provides good wear, oil and water resistance; may be used for under watr applications | ||
Butyl rubber (synthetic) | Butyl mastic, Buna-N rubber | 1950s | Isobutylene-isoprene, talc calcium carbonate, mineral spirits, adhesion promoters | Elastomeric with excellent peel strecngth but low shear strength; sticky and messy; more resistant to sunlight than natural rubbers; combustible; paintable | Primarily used outdoors for metal and masonry joints that may expand and contract (gutters) |
Cyanoacrylate | Krazy glue, Superglue, Zap, ELFY, Eastman 910 | 1941 | Thermosetting adhesive without heat or added catalyst | Difficult to remove; degraded by UV light and alkalis | Bonds metals to non-metals; used for glass, ceramic, and suturing skin |
Epoxies | Ablebond, Araldite AY103; Hxtal Nyl-1, Phiilyseal, CM Nond, Epotek, UHU | 1939 | A famil y of thermosetting resins that polymerize with themseolves or with co-reactants. Th reaction is exothermix | High strength, good abrasion and chemical resistance, low water absorption; used for paint,coating, hard-plastics as well as adhesives; may cause allergic reactions | Bonds wood, metal, glass , stone and some plastics |
Ethylene vinyl acetate | hot-melt glues, Elvax, A-C copolymer, Vinamul, Mowilith, Elvace 1874, Jade 834 | polyethylene mixed with about 10-40% vinyl acetate | thermosetting polymer with rubber-like characteristics; soft, flexible material is waterproof, tough and stress-crack resistant; it has high cohesive strength and fast-setting speed | Bond textiles, paper, glass; used as carpet backing adhesive | |
Phenol formaldehyde | phenolic resin, resorcinol, Bakelite | 1907 | Temperature and UV resistant; off gases phenol and formaldehyde; water soluble until set; low cost; darkens in sunlight | Used for laminating plywood especially for outdoor use | |
Urea formaldehyde | 1896 | Water-soluble resin | Off-gases urea, ammonia and formaldehyde, thermosetting; degraded by hear, acids, alkalis | Used for laminating plywood; particleboard | |
Polysulfide | Neoprene, Thiokol | 1950s | Any synthetic rubber vulcanized with sulfur (Neoprene, styrene-butadiene, polyisoprene). Some polusulfide elastomers are used with epoxies to provide flexibility | will melt acrylic, polycarbonate, ABS and PVC plastics; can be used on nylon, epoxy, polyoxymethylene; may release sulfur; may contain PCBs; poor tensile strength; abrade easily; replaced in 1980s by silicone and urethane sealants | still used for chemically resistant tapes and gaskets in aircraft because of their vibration durability |
Silicone | Silastic, Clear Museum gel, Dowsil RTV | 1960s | Silicone resin cured with moisture or peroxides; may contain fumed silica, calcium cabonate, ground quartz, carbon black, talc, plasticizers, acetone, methylene chloride. May be clear, white, or colored | water-repellent; long-life; wide temperature range; mold/mildew resistant; not paintable; poor adhesion; may release acetic acid or methanol on cure; may have residual curing compounds and silicone oils; may stain porous materials | Sealants are often used in outdoors settings; Pressure sensitive adhesives are used on skin for medical devices and drug delivery |
Polyurethane | Gorilla glue | 1937 | Available and one- or two-component adhesives, solvent -free; may be bulked with limestone and/or quartz | shrink free; very durable; abrasion resistant; flexible at low temperatures; combustible producing toxic fumes; may release acetic acid on curing, aging, or deterioration; susceptiple to hydrolysis that may decrease adhesion | Strong adhesive for metal and glue; laying carpets and wood floor board; may dissolve some plastics |
Vinyl latex | Vinyl emulsion; vinyl acrylic emulsion; white latex | late 1960s | Polyvinyl acetate as an emulsion in water usually with calcium carbonate, plasticizers and dispersing agents. Vinyl acrylic latex contains a co-polymer of vinyl acetate and butyl acrylate. | inexpensive; high stability; water-resistant when dry; may be used as a liquid or solid (for heat sealing); may evolve trace acetic acid as it cures; | Used for paper, textile, packaging, mounting photographs, laying carpets and floor tiles; also used as sealants and paints |
Synonyms and Related Terms
kleefstof (Ned.); adhésif (Fr.); colle (Fr.); Klebstoff (Deut.); adesivo (It.); adhesivo (Esp.); adesivo (Port.); adhesiv (Sven.); bindemedel (Sven.); mastic; cement; glue; mucilage; paste;
Physical and Chemical Properties
General Characteristics of Polymers
Physical Properties for Selected Thermoplastic Resins
Physical Properties for Selected Thermoset Resins
Resources and Citations
- AIC Conservation Wiki: Adhesives for Use Inside Exhibit Cases
- Irving Skeist, Handbook of Adhesives, Van Nostrand Reinhold Company, New York, 1977
- Matte Paint: Its history and technology, analysis, properties and conservation treatment, Eric Hansen, Sue Walston, Mitchell Bishop (ed.), J. Paul Getty Trust, Los Angeles, Vol. 30 of AATA, 1993
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- Wikipedia: Adhesive (Accessed Feb. 2, 2006 and Feb 2023)
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 14
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Multilingual Glossary for Art Librarians at http://www.ifla.org/VII/s30/pub/mgl.htm
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000