Paraloid B-72: Difference between revisions

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[Rohm & Haas] A registered trademark for a clear, colorless, thermoplastic acrylic resin. Paraloid B-72 (formerly called Acryloid B-72 in the United States) is composed of an ethyl methacrylate (70%) and methyl acrylate (30%) copolymer. It was a shown to be a very stable resin for use in conservation (Feller 1972). Initially, Paraloid B-72 was supplied as white irregular lumps with a slight acrylic acid smell and a composition of ethyl methacrylate (68%) and methyl acrylate (28%); by 1976 the product changed to the odorless, transparent globules (de Witte et al 1978). Commercially, Paraloid B-72 is used as a general purpose coating. It produces a stable, wear resistant, nonyellowing finish. It is compatible with vinyl, cellulosic, and silicone resins. In conservation, Paraloid B-72 has been used as a coating, consolidant, and adhesive. Paraloid B-72 is supplied as solid pellets or as a 50% solids solution in toluene (Paraloid B-72 50%).
[Rohm & Haas] A registered trademark for a clear, colorless, thermoplastic acrylic resin. Paraloid B-72 (formerly called Acryloid B-72 in the United States) is composed of an ethyl methacrylate (70%) and methyl acrylate (30%) copolymer. It was a shown to be a very stable resin for use in conservation (Feller 1972). Initially, Paraloid B-72 was supplied as white irregular lumps with a slight acrylic acid smell and a composition of ethyl methacrylate (68%) and methyl acrylate (28%); by 1976 the product changed to the odorless, transparent globules (de Witte et al 1978). Commercially, Paraloid B-72 is used as a general purpose coating. It produces a stable, wear resistant, nonyellowing finish. It is compatible with vinyl, cellulosic, and silicone resins. In conservation, Paraloid B-72 has been used as a coating, consolidant, and adhesive. Paraloid B-72 is supplied as solid pellets or as a 50% solids solution in toluene (Paraloid B-72 50%).


[[File:DT 9-29-2004 08-B72 and microballoon fills.jpg|thumb|Paraloid B-72 and
[[File:DT 9-29-2004 08-B72 and microballoon fills.jpg|thumb|Paraloid B-72 and microballoon fills]]
 
[[[SliderGallery rightalign|Paraloid B-72 FTIR.PNG~FTIR]]]
microballoon fills]]
== Synonyms and Related Terms ==
== Synonyms and Related Terms ==


Acryloid B-72; Paraloid B72; Paraloid B-72; Acryloid B-72 (sp); Acryloid B72 (sp); Paraloid B72 (Port.)
Acryloid B-72; Paraloid B72; Paraloid B-72; Acryloid B-72 (sp); Acryloid B72 (sp); Paraloid B72 (Port.)


[[[SliderGallery rightalign|Paraloid B-72 FTIR.PNG~FTIR]]]
==Applications==
 
* Coatings/barrier for mount making
== Other Properties ==
   
 
== Personal Risks ==
Soluble in toluene, xylene, acetone, carbon tetrachloride, MEK. 
 
Paraloid B-72 made after 1976 is soluble in ethanol.  
 
Slightly soluble in isopropanol.
 
Insoluble in aliphatic hydrocarbons, water, oils, grease.
 
{| class="wikitable"
|-
! scope="row"| Molecular Weight
| Tg = 40 C
|-
! scope="row"| Refractive Index
| 1.479-1.489
|}
 
== Hazards and Safety ==


Talas: [http://talasonline.com/photos/msds/b72.pdf MSDS]
Talas: [http://talasonline.com/photos/msds/b72.pdf MSDS]
 
== Collection Risks ==
== Additional Information ==
 
Jerry Podany, Kathleen M. Garland, William R. Freeman, Joe Rogers, "Paraloid B-72 as a Structural Adhesive and as a Barrier Within Structural Adnesive Bonds: Evaluations of Strength and Reversibility" JAIC 40(1), 2001 ([http://aic.stanford.edu/jaic/articles/jaic40-01-002_appx.html link]).
 
J. Down, M.MacDonald, J.Te'treault, S.Williams, "Adhesive Testing at the Canadian Conservation Institute-An Evaluation of Selected Poly(Vinyl acetate) and Acrylic Adhesives", ''Studies in Conservation'' 41:19-44, 1996. 
 
E. de Witte, M.Goessens-Landrie, E.J.Goethals, T.Simonds, "The Structure of 'Old' and 'New' Paraloid B72", ICOM preprints 78/16/3/1-9, Zagreb, 1978. 
 
R.L.Feller, N.Stolow, E.H.Jones, ''On Picture Varnishes and their Solvents'', the press of Case Western Reserve University, Cleveland, 1972.
 
'''Links to Oddy Test results posted on AIC Wiki Materials Database Pages for individual materials below'''
'''Links to Oddy Test results posted on AIC Wiki Materials Database Pages for individual materials below'''


[http://www.conservation-wiki.com/wiki/Oddy_Test_Results:_Exhibition_Adhesives_and_Tapes#Paraloid0001 Paraloid B72] tested in 2013
[http://www.conservation-wiki.com/wiki/Oddy_Test_Results:_Exhibition_Adhesives_and_Tapes#Paraloid0001 Paraloid B72] tested in 2013
== Environmental Risks ==


== Authority (List of sources checked for information on this material)==
== Physical and Chemical Properties ==
 
* Ralph Mayer, Ralph Mayer, ''A Dictionary of Art Terms and Techniques'', Harper and Row Publishers, New York, 1969 (also 1945 printing)
 
* Paintings Specialty Group, Paintings Specialty Group, ''Painting Conservation Catalog'', Wendy Samet (ed.), AIC, Washington, DC, 1998
 
* Book and Paper Group, Book and Paper Group, ''Paper Conservation Catalog'', AIC, 1984, 1989


* Marie Svoboda, Marie Svoboda, Conservation Survey Index, unpublished, 1997
* Soluble in toluene, xylene, acetone, carbon tetrachloride, MEK. 
* Paraloid B-72 made after 1976 is soluble in ethanol. 
* Slightly soluble in isopropanol.
* Insoluble in aliphatic hydrocarbons, water, oils, grease.
* Molecular weight = 105,000
* Tg = 40 C
* Refractive Index = 1.479-1.489


* Conservation Support Systems, Conservation Support Systems, Catalog, 1997
== Working Properties ==


* Product Information  Comment: Rohm and Haas acryloid acrylic resins sheet.1986
== Forms and Sizes ==


* External source or communication, External source or communication  Comment: CoOL DistList 2/10/2002
== Resources and Citations ==


* Website address 1, Website address 1  Comment: www.rohmhaas.com
* Jerry Podany, Kathleen M. Garland, William R. Freeman, Joe Rogers, "Paraloid B-72 as a Structural Adhesive and as a Barrier Within Structural Adnesive Bonds: Evaluations of Strength and Reversibility" JAIC 40(1), 2001 ([http://aic.stanford.edu/jaic/articles/jaic40-01-002_appx.html link]).
* J. Down, M.MacDonald, J.Te'treault, S.Williams, "Adhesive Testing at the Canadian Conservation Institute-An Evaluation of Selected Poly(Vinyl acetate) and Acrylic Adhesives", ''Studies in Conservation'' 41:19-44, 1996. 
* E. de Witte, M.Goessens-Landrie, E.J.Goethals, T.Simonds, "The Structure of 'Old' and 'New' Paraloid B72", ICOM preprints 78/16/3/1-9, Zagreb, 1978. 
* R.L.Feller, N.Stolow, E.H.Jones, ''On Picture Varnishes and their Solvents'', the press of Case Western Reserve University, Cleveland, 1972.
* Ralph Mayer, ''A Dictionary of Art Terms and Techniques'', Harper and Row Publishers, New York, 1969 (also 1945 printing)
* Paintings Specialty Group, ''Painting Conservation Catalog'', Wendy Samet (ed.), AIC, Washington, DC, 1998
* Book and Paper Group, ''Paper Conservation Catalog'', AIC, 1984, 1989
* Marie Svoboda, Conservation Survey Index, unpublished, 1997
* Conservation Support Systems, Catalog, 1997
* Product Information: Rohm and Haas acryloid acrylic resins sheet.1986
* CoOL DistList 2/10/2002
* Website address: www.rohmhaas.com






[[Category:Materials database]] [[Category:MWG]]
[[Category:Materials database]][[Category:MWG]][[Category:Coatings]][[Category: Coating: Solvent-based]][[Category:Adhesives]][[Category: Adhesive: Solvent-based]]

Latest revision as of 13:17, 24 July 2025

Injecting Paraloid B-72

Description

[Rohm & Haas] A registered trademark for a clear, colorless, thermoplastic acrylic resin. Paraloid B-72 (formerly called Acryloid B-72 in the United States) is composed of an ethyl methacrylate (70%) and methyl acrylate (30%) copolymer. It was a shown to be a very stable resin for use in conservation (Feller 1972). Initially, Paraloid B-72 was supplied as white irregular lumps with a slight acrylic acid smell and a composition of ethyl methacrylate (68%) and methyl acrylate (28%); by 1976 the product changed to the odorless, transparent globules (de Witte et al 1978). Commercially, Paraloid B-72 is used as a general purpose coating. It produces a stable, wear resistant, nonyellowing finish. It is compatible with vinyl, cellulosic, and silicone resins. In conservation, Paraloid B-72 has been used as a coating, consolidant, and adhesive. Paraloid B-72 is supplied as solid pellets or as a 50% solids solution in toluene (Paraloid B-72 50%).

Paraloid B-72 and microballoon fills

FTIR

Paraloid B-72 FTIR.PNG

Synonyms and Related Terms

Acryloid B-72; Paraloid B72; Paraloid B-72; Acryloid B-72 (sp); Acryloid B72 (sp); Paraloid B72 (Port.)

Applications

  • Coatings/barrier for mount making

Personal Risks

Talas: MSDS

Collection Risks

Links to Oddy Test results posted on AIC Wiki Materials Database Pages for individual materials below

Paraloid B72 tested in 2013

Environmental Risks

Physical and Chemical Properties

  • Soluble in toluene, xylene, acetone, carbon tetrachloride, MEK.
  • Paraloid B-72 made after 1976 is soluble in ethanol.
  • Slightly soluble in isopropanol.
  • Insoluble in aliphatic hydrocarbons, water, oils, grease.
  • Molecular weight = 105,000
  • Tg = 40 C
  • Refractive Index = 1.479-1.489

Working Properties

Forms and Sizes

Resources and Citations

  • Jerry Podany, Kathleen M. Garland, William R. Freeman, Joe Rogers, "Paraloid B-72 as a Structural Adhesive and as a Barrier Within Structural Adnesive Bonds: Evaluations of Strength and Reversibility" JAIC 40(1), 2001 (link).
  • J. Down, M.MacDonald, J.Te'treault, S.Williams, "Adhesive Testing at the Canadian Conservation Institute-An Evaluation of Selected Poly(Vinyl acetate) and Acrylic Adhesives", Studies in Conservation 41:19-44, 1996.
  • E. de Witte, M.Goessens-Landrie, E.J.Goethals, T.Simonds, "The Structure of 'Old' and 'New' Paraloid B72", ICOM preprints 78/16/3/1-9, Zagreb, 1978.
  • R.L.Feller, N.Stolow, E.H.Jones, On Picture Varnishes and their Solvents, the press of Case Western Reserve University, Cleveland, 1972.
  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • Paintings Specialty Group, Painting Conservation Catalog, Wendy Samet (ed.), AIC, Washington, DC, 1998
  • Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
  • Marie Svoboda, Conservation Survey Index, unpublished, 1997
  • Conservation Support Systems, Catalog, 1997
  • Product Information: Rohm and Haas acryloid acrylic resins sheet.1986
  • CoOL DistList 2/10/2002
  • Website address: www.rohmhaas.com
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