Paraloid B-72

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

Synonyms and Related Terms

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

FTIR

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

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

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